GARN® WHS 1000 AND WHS 2000 Owner’s Manual This manual is updated periodically as continual product improvements are made. It is common for the manual to have minor revisions a couple of times per year. For the latest version of this manual, visit www.garn.com.
Manufacturer: HY-C Company LLC • St. Louis, Missouri 63132 Phone: 800-325-7076 • www.garn.com
©2024 HY-C C ompany LLC . All rights reserved. No part of the contents of this manual may be reproduced or transmitted in any form or by any means without the written permission of HY-C C ompany LLC .
GARN WHS 1000 and WHS 2000 Manual © HY-C Company LLC - September 2024
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OWNER ’ S MANUAL FOR CURRENT GARN® MODELS: WHS 1000 & 2000 THIS MANUAL ALSO APPLIES TO DISCONTINUED MODELS: WHS 1350, 1450, 1500 and 1900
Thank you for purchasing GARN® equipment. Carefully read this manual. It contains instructions about how to unpack, install, operate, and maintain your GARN® WHS. Please compare your packing list with the delivered items. Contact your dealer, HY-C Company LLC , and shipper immediately if any items are missing or damaged.
Table of Contents
A. WELCOME TO THE WORLD OF GARN® WOOD HEATING: ............................................................................................ 6
GARN® WHS WOOD HEATING PACKAGE (STANDARD): ...........................................................................................................6 GARN® WHS ELECTRIC HEATING PACKAGE (OPTIONAL): .........................................................................................................6 OVERVIEW OF GARN® COMPONENTS: WHS-1500V/2000V ....................................................................................................7 OVERVIEW OF GARN® COMPONENTS: WHS-1000V (J UNIOR ) ...................................................................................................8 OVERVIEW OF GARN® CONTROLS ...........................................................................................................................................9
B. CODES, INSURANCE, AND SAFETY SYMBOLS ............................................................................................................. 10
C. UNPACKING AND ASSEMBLY..................................................................................................................................... 11
FACTORY PREINSTALLED ITEMS: ............................................................................................................................................11 MANWAY COVER AND GASKET..............................................................................................................................................11 WHERE IS THE GARN® MANWAY COVER? .............................................................................................................................. 12 SPLIT COVER ......................................................................................................................................................................12 ALIGNING THE COMBUSTION DOOR:.....................................................................................................................................13 SQUARING THE INNER DOOR TO THE UNIT: .....................................................................................................................13 ALIGNING THE HANDLE WITH LATCH BOLT: .....................................................................................................................13 ADJUSTING THE DOOR SEAL:.............................................................................................................................................13 INDUCED DRAFT FACE MOUNTED BLOWER ASSEMBLY .........................................................................................................14
D. INSTALLATION........................................................................................................................................................... 17
UNIT PLACEMENT ..................................................................................................................................................................17 CLEARANCE TO COMBUSTIBLES ........................................................................................................................................17 CLEARANCE TO CEILING ....................................................................................................................................................18 GARAGE PLACEMENT ........................................................................................................................................................19 REMOTE BUILDING PLACEMENT & SLAB REQUIREMENTS ................................................................................................20 SETTING THE UNIT.............................................................................................................................................................21 HOT WATER RETURN ASSEMBLY ……………………………………………………………………………………………………….……………………… 21 BYPASS/SIDE-STREAM FILTER INSTRUCTIONS .......................................................................................................................23 INSTALLATION INSTRUCTIONS: .........................................................................................................................................24 ALLOWABLE FLOWRATE AND SPECIFICATION OF THE BYPASS FILTER:.............................................................................24 PIPING CONFIGURATIONS: ................................................................................................................................................24 INDEPENDENT CIRCUIT PIPE CONFIGURATIONS: ..............................................................................................................25 HOW TO TELL IF THE FILTER IS WORKING: ........................................................................................................................26 WHEN TO REPLACE THE FILTER: ........................................................................................................................................26 OPERATING INSTRUCTIONS: .............................................................................................................................................. 26 COMBUSTION AIR INLET ........................................................................................................................................................27 MAXIMUM LENGTH AND NUMBER OF ELBOWS...............................................................................................................27 WALL LOCATION REQUIREMENTS (HORIZONTAL EXHAUST) ............................................................................................28 WALL LOCATION REQUIREMENTS (VERTICAL EXHAUST) ..................................................................................................28
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INLET HOOD INSTALLATION WITH LAP OR UNEVEN SIDING............................................................................................. 29 CONNECTING THE AIR INLET DUCT AT THE GARN® UNIT ................................................................................................. 30 ADDITIONAL AIR INLET FOR MAKEUP AIR IN A RELATIVELY “AIR TIGHT” BUILDING (INCLUDES MULTIPLE UNIT INSTALLATION) .................................................................................................................................................................. 31 AIR INTAKE DAMPER.............................................................................................................................................................. 32 INSTALLING THE AIR INTAKE DAMPER .............................................................................................................................. 32 INSULATING THE AIR INTAKE DAMPER ............................................................................................................................. 32 WIRING THE AIR INTAKE DAMPER .................................................................................................................................... 35 ELECTRIC HEATING PACKAGE INSTALLATION ........................................................................................................................ 36 SPARK ARRESTOR .................................................................................................................................................................. 36 INSTALLATION: .................................................................................................................................................................. 37 INSPECTION AND CLEANING: ............................................................................................................................................ 38 EXHAUST FLUE INSTALLATION ............................................................................................................................................... 39 GENERAL NOTES (READ THIS FIRST).................................................................................................................................. 39 WHERE TO BUY FLUE ........................................................................................................................................................ 41 CONNECTING THE FLUE TO THE UNIT............................................................................................................................... 42 FLUE GAS DISCHARGE CLEARANCES ................................................................................................................................. 45 HORIZONTAL SIDEWALL FLUE ........................................................................................................................................... 46 EXTERNAL VERTICAL FLUE USING AN EXTERIOR TEE ........................................................................................................ 47 INTERNAL VERTICAL FLUE ................................................................................................................................................. 48 VERTICAL FLUE - HEIGHT ABOVE NEARBY BUILDING COMPONENTS ............................................................................... 48 CONNECTION TO A MASONRY CHIMNEY .......................................................................................................................... 48 MAXIMUM FLUE LENGTH (HORIZONTAL RUN AND VERTICAL HEIGHT) ........................................................................... 50 INSULATING YOUR GARN® .................................................................................................................................................... 52 AMOUNT OF INSULATION................................................................................................................................................. 52 ENCLOSURE CONSTRUCTION METHOD............................................................................................................................. 53 GARN® WHS/ETS DIGITAL CONTROLLER................................................................................................................................ 54 IDENTIFYING YOUR BOARD REVISION............................................................................................................................... 55 IDENTIFYING YOUR CHIP REVISION................................................................................................................................... 55 INSTALLING THE GARN® WHS/ETS DIGITAL CONTROLLER................................................................................................ 56 REV A WIRING PICTURES:.................................................................................................................................................. 58 REV C AND REV D WIRING PICTURES: ............................................................................................................................... 60 EXTENDING THE SENSOR WIRES ....................................................................................................................................... 61 DO NOT MODIFY THE DIGITAL CONTROLLER OR ADD ADDITIONAL COMBUSTION CONTROLS .......................................61 LOW WATER CUT-OFF AND TANK TEMPERATURE SENSOR STEM .................................................................................... 62 PIPING YOUR GARN® ............................................................................................................................................................. 65 WARNINGS WHEN CONNECTING TO AN EXISTING SYSTEM OR GLYCOL TREATED SYSTEM .............................................65
E. FILLING AND WATER TREATMENT .............................................................................................................................66
STEP 1 – FILL WATER SAMPLE TEST:....................................................................................................................................... 66 STEP 2 - CLEANING: ................................................................................................................................................................ 67 STEP 3 - TREATMENT: ............................................................................................................................................................ 68 STEP 4 – INITIAL FOLLOW-UP: ................................................................................................................................................ 69 STEP 5 – LONG TERM FOLLOW-UP:........................................................................................................................................ 69 EXAMPLE WATER TESTING SCHEDULE................................................................................................................................... 70 CORROSION – WHO’S RESPONSIBLE? .................................................................................................................................... 71 NOTES ON PREVENTING CORROSION, COMMON TYPES OF CORROSION, AND WATER QUALITY ......................................... 72 PROPER CONNECTIONS AND GROUNDING....................................................................................................................... 72 WATER POLLUTION FROM RURAL WELLS ......................................................................................................................... 72 POLYPHOSPHATES AND GARN FILL WATER ...................................................................................................................... 72 COMMON TYPES OF BOILER CORROSION: ........................................................................................................................ 73 MAINTENANCE PROCEDURES TO MINIMIZE CORROSION POTENTIAL .................................................................................. 74
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GLYCOL IN STEEL WATER TANKS ............................................................................................................................................75 HOW TO CLEAN A GARN UNIT (SAVING THE TREATED WATER) .............................................................................................75
F. ELECTRIC ISOLATION AND PROPER GROUNDING TO PREVENT ELECTROLYSIS CORROSION....................................... 78
UNDIRECTED CURRENT - TERMINOLOGY: .............................................................................................................................. 78 CORROSION FROM UNDIRECTED CURRENT: .........................................................................................................................78 PROTECTION METHODS (OPTIONS FOR PROTECTION): .........................................................................................................79 FOR EXISTING CUSTOMERS: ..............................................................................................................................................79 FOR NEW CUSTOMERS: .....................................................................................................................................................79 ELECTRIC ISOLATION: ............................................................................................................................................................. 79 IF ELECTRIC HEATING ELEMENTS ARE INSTALLED: ............................................................................................................79 LOW VOLTAGE SENSORS: ..................................................................................................................................................79 AIR INTAKE DAMPER: ........................................................................................................................................................80 UNITS WITHOUT ELECTRIC HEATING ELEMENTS: ..................................................................................................................80 FULL ISOLATION (OPTION 1)..............................................................................................................................................80 SINGLE POINT GROUNDING (OPTION 2): ..........................................................................................................................82 UNITS WITH ELECTRIC HEATING ELEMENTS: .........................................................................................................................84 MOTOR ISOLATION BUSHINGS INSTALLATION: .....................................................................................................................85
G. OPERATION ............................................................................................................................................................... 87
STARTING A FIRE ....................................................................................................................................................................87 CONDENSATION LEAK POINTS DURING COLD FIRING............................................................................................................89 OVERVIEW OF THE DIGITAL CONTROLLER .............................................................................................................................89 DIGITAL READOUT: ............................................................................................................................................................90 OPERATIONAL SAFETY GUIDE ................................................................................................................................................91 APPROVED FUELS...................................................................................................................................................................91 OPERATION AT HIGHER ALTITUDES .......................................................................................................................................92
H. MAINTENANCE.......................................................................................................................................................... 93
B LOWER W HEEL G ASKET /W HEEL R EPLACEMENT & R EMOVAL ( AS NECESSARY ): ..................................................................................... 93 A SH R EMOVAL : ( FREQUENTLY )......................................................................................................................................................95 H EAT E XCHANGER /F LUE T UBE C LEANING : (1 PER YEAR OR AS NECESSARY ) ............................................................................................95 C HIMNEY C LEANING : (1 PER YEAR OR AS NECESSARY ) ........................................................................................................................95 C LEANOUT C OVER G ASKETS : ( AS NECESSARY ) ..................................................................................................................................96 PREVENTING THE CLEANOUT GASKETS FROM STICKING ..................................................................................................97 C LEAN B LOWER M OTOR : (2 PER YEAR )...........................................................................................................................................98 C OMBUSTION A IR I NTAKE H OOD : ( FREQUENTLY ) ..............................................................................................................................98 F UEL L OADING D OOR G ASKET : ( EVERY 5 YEARS ) ............................................................................................................................... 98 M ANWAY C OVER G ASKET : (1 PER YEAR OR AS NECESSARY ) – SPUN MANWAY ONLY ........................................................................100 F IREBRICK R EPLACEMENT : ( AS NECESSARY ) ....................................................................................................................................102 S ECONDARY R EACTION C HAMBER (SRC): ( EVERY 5 TO 10 YEARS )......................................................................................................103 S PRING S HUTDOWN /W ET L AYUP : ( END OF HEATING SEASON ) ..........................................................................................................104 M AINTENANCE S CHEDULE :.........................................................................................................................................................105
I. TROUBLE SHOOTING ............................................................................................................................................... 106
D IGITAL C ONTROLLER ................................................................................................................................................................106 L ACK OF H EAT IN B UILDING ........................................................................................................................................................106 D RAFT I NDUCER F AILS TO O PERATE ..............................................................................................................................................106 N OISY B LOWER W HEEL .............................................................................................................................................................106
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P UFFING D URING O PERATION .................................................................................................................................................... 107 PLACEMENT OF OPTIONAL PRIMARY AIR CONTROL FIREBRICK......................................................................................108 I N C ASE OF E LECTRICAL P OWER F AILURE ....................................................................................................................................... 109 F ORMATION OF S MOKE OR C REOSOTE .......................................................................................................................................... 109 S MELL OF S MOKE ..................................................................................................................................................................... 109 E XCESSIVE W ATER C ONSUMPTION .............................................................................................................................................. 109 C ORROSION OF THE S TORAGE T ANK ............................................................................................................................................. 110 E XCESSIVE W OOD U SE .............................................................................................................................................................. 110
J. GARN® WHS DIMENSIONS.......................................................................................................................................111
GARN® WHS-1000H (GARN® JR) O VERALL D IMENSIONS ........................................................................................................... 111 GARN® WHS-1000V (GARN® JR) O VERALL D IMENSIONS ........................................................................................................... 112 GARN® 1500H O VERALL D IMENSIONS ....................................................................................................................................... 113 GARN® 1500V O VERALL D IMENSIONS ....................................................................................................................................... 114 GARN® 2000H O VERALL D IMENSIONS ....................................................................................................................................... 115 GARN® 2000V O VERALL D IMENSIONS ....................................................................................................................................... 116
K. EMISSIONS CERTIFICATION AND COMPLIANCE INFORMATION ...............................................................................117
M ANDATORY EPA W ORDING :.................................................................................................................................................... 117 M ODEL AND C OMPLIANCE S TATUS : ............................................................................................................................................. 117 H EAT O UTPUT R ANGES : ............................................................................................................................................................ 118 E FFICIENCY :............................................................................................................................................................................. 118 T AMPER W ARNINGS : ................................................................................................................................................................ 118 F UEL S ELECTION :...................................................................................................................................................................... 119 S MOKE AND C ARBON M ONOXIDE E MISSIONS AND M ONITORS :......................................................................................................... 119 F URTHER R ESOURCES :............................................................................................................................................................... 119
L. MAINTENANCE SCHEDULE ....................................................................................................................................... 120
M. SPECIFICATIONS ..................................................................................................................................................121
N. WARRANTY .............................................................................................................................................................122
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A. WELCOME TO THE WORLD OF GARN® WOOD HEATING: The GARN® Wood Heating System (WHS) is unlike any other piece of wood heating equipment. As you use your GARN® , you will come to appreciate its quality construction, unique features and many benefits. The purpose of this manual is to give the installer and operator the necessary information for proper installation, operation, and maintenance of a GARN® WHS. For proper sizing and selection, please refer to the GARN® System Design Manual.
GARN® WHS WOOD HEATING PACKAGE (STANDARD):
Every GARN® WHS wood heating package comes standard with the following components:
WHS/ETS Digital Controller Low Water Sensor Stem Flue Temperature Sensor Tank Temperature Sensor Hot Water Supply Sensor Hot Water Return Sensor
Air intake hood
• • • • • •
• • • • • •
Water treatment test kit Water filter and housing Cleanout plates and gaskets
Bent flow stabilizer
Motor, motor plate and blower wheel
GARN® WHS ELECTRIC HEATING PACKAGE (OPTIONAL): Every GARN® WHS is shipped with 9 threaded electric element flanges in the lower-right corner of the front head/face of the unit. The flanges provide the opportunity to purchase the electric heating package and turn the GARN® WHS unit into an electric heating system. Electric heating can be used in conjunction with wood heating to provide a dual-fuel heating system. There are 3 electric heating package sizes to choose from. The correct size for your application depends on the utility/coop off-peak electric program, heating load, and GARN WHS unit size:
Electric Heating Package Size Number of Electric Elements 16.5 kW 3 33.0 kW 6 49.5 kW 9
The Complete GARN Electric Heating Package comes standard with the following components:
• Electric Elements (3, 6, or 9 depending on heating package size selected) • O-rings for elements • Electric Element Junction Box, Cover, Label, and Fasteners • Electric Element Junction Box Face Gasket
• Element Sequencer (powers the elements on one-at-a-time) • High Limit Switch • Newest available Processor Chip for the Digital Controller • An OD temperature sensor is available as an option . Refer to GARN web site.
All GARN Electric Heating packages are UL certified, US and Canada. Refer to the actual label on the controls.
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OVERVIEW OF GARN® COMPONENTS: WHS-1500V/2000V
For additional detail and dimensions of the WHS-1500H/V and WHS-2000H/V, see the Dimensions section of this manual.
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OVERVIEW OF GARN® COMPONENTS: WHS-1000V (Junior)
For additional detail and dimensions of the WHS-1000H/V (Junior), see the Dimensions section of this manual. In addition see the separate document “WHS - 1000 Manual Addendum” available at www.garn.com
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OVERVIEW OF GARN® CONTROLS
The diagram below shows the controls and sensors that are part of the basic GARN® WHS Wood Heating Package and the optional Electric Heating Package.
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CODES, INSURANCE, AND SAFETY SYMBOLS
B. CODES, INSURANCE, AND SAFETY SYMBOLS The GARN® WHS Wood Heating System is a direct-vented wood-burning appliance that stores heat in a non-pressurized vessel. It is listed by Intertek Testing Laboratory, Madison, Wisconsin according to UL 2523-2011 and CAN/USA B366.1-11. It is to be installed according to this manual, on-line technical bulletins, Federal, State and local codes, and your insurance underwriter’s guidelines.
The GARN® unit, all related heating equipment (including pumps, piping, fan coils, hot water baseboard, radiant floor heating systems, etc), and all electrical equipment (including power wiring, controls, control wiring, back up electric heating, etc) must be installed by a qualified installer or licensed personnel in strict compliance with all Federal, State and local codes. All electrical equipment, devices and wiring installed with the GARN® unit must be UL listed, US and Canada. The installer is to supply and install all code required electrical over current and disconnect devices. Local building and fire inspectors are given discretion to determine if construction and heating installations are safe. They use recommended guidelines developed by various national organizations, such as NFPA (National Fire Protection Association). Your insurance company may also have specific guidelines concerning the installation of wood heating equipment. Follow all local and national codes. The installation must comply with applicable sections of Canadian CSA Standard B365 or U.S. NFPA Standard 211.
The design of the GARN® Wood Heating System is unique and was developed under the following patents: United States Patents #4,401,101 and #4,549,526; Canadian Patents #1,163,880 and #1,220,686.
This manual is intended to comply with NEMA Z535.6-2006 (the standard for Product Safety Information in Product Manuals, Instructions, and Other Collateral Material ). Throughout the manual, a series of safety symbols are intended to call to attention the following types of information:
A notice provides a piece of information to make a procedure/process easier or clearer.
A caution emphasizes where equipment damage might occur. Personal injury is not likely.
A warning emphasizes areas where personal injury or death may occur but is not likely. Property or equipment damage is likely.
A danger emphasizes areas or procedures where death, serious injury, or property damage is likely if not strictly followed.
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UNPACKING AND ASSEMBLY : FACTORY PREINSTALLED ITEMS:
C. UNPACKING AND ASSEMBLY
The GARN® unit is shipped with most of its components inside the combustion chamber. Additional components and accessory items may be shipped within the tank proper .
DO NOT REMOVE THE FIREBRICK .
It is preinstalled correctly at the factory.
The following components should be removed from the combustion chamber:
Digital controller
o
Digital controller sensors
o
Air intake hood
o
Low water cut off/sensor stem
o
Water treatment test kit Water filter and housing
o
o
o Motor mount plate, motor and blower wheel o Hot water return assembly o Bent flow stabilizer o Cleanout plates, gaskets, and SS gasket savers
COMPONENTS TO UNPACK CAN VARY WITH TYPE OF INSTALLATION AND ACCESSORIES ORDERED. Compare the packing slip that came with your unit to the components
unpacked.
FACTORY PREINSTALLED ITEMS:
The following items are assembled and properly installed at the factory:
Firebrick with insulation backing pads
o
o Ceramic reaction chamber tube (2 sections) with rear insulating ring o Lower nozzle heat shield o Loading door
MANWAY COVER AND GASKET
A galvanized steel manway cover is provided with all GARN® WHS equipment. The manway cover:
Provides mounting for the sensor stem. Prevents debris from entering the tank. Is a pressure relief for the GARN® WHS.
•
•
•
• Minimizes evaporation of the storage water.
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UNPACKING AND ASSEMBLY : WHERE IS THE GARN® MANWAY COVER?
DO NOT FASTEN THE MANWAY COVER TO THE MANWAY ACCESS RING . The GARN® WHS unit is non-pressurized hydronic heating unit. An internal overflow/vent
will prevent the development of internal pressure that results from the gentle expansion and contraction associated with the varying temperature of the water. In cases where accidental over-firing results in rapid boiling, the manway cover is designed to rise slightly to relieve internal pressure. If undesirable evaporation occurs, a 10 lb weight can be placed on top of the manway without compromising its function as a pressure relief. This will seat the gasket better and prevent unwanted evaporation.
WHERE IS THE GARN® MANWAY COVER?
SPLIT COVER
Units produced after September 2015 are shipped with a “split” manway cover. The manway cover is shipped in a box in the combustion chamber. See your packing list for box location. For installation instructions, see the LOW WATER CUT-OFF AND TANK TEMPERATURE SENSOR STEM on page 63 of this manual.
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UNPACKING AND ASSEMBLY : ALIGNING THE COMBUSTION DOOR:
ALIGNING THE COMBUSTION DOOR: The combustion door consists of an inner insulated door on a threaded shaft and an outer door which acts as a heat shield. The outer door is designed to function as a spring. It maintains pressure on the high-temperature, flexible gasket along the edge of the inner door. These were positioned properly at the factory, but movement during shipping may necessitate adjustment on site. Periodic adjustments may also be required.
SQUARING THE INNER DOOR TO THE UNIT:
If the inner door is not square with the air collar, it should be adjusted. Grab the inner door on its gasketed edge with hands on opposing sides. Push with one hand and pull with the other.
Rotate the inner door to verify that it has been brought roughly to within square of the outer door. Visually, the inner door should rotate without moving out-of-square with the outer door and air collar. This doesn’t have to be perfect. Within 1/4” of square should allow the inner door gasket to seal properly.
ALIGNING THE HANDLE WITH LATCH BOLT:
The door handle bolt should be level with the latch bolt on the air collar. To adjust this, use a pry bar between the handle bolt and latch bolt and pry in the direction necessary to make them align (see figure to right). If the latch is not far out of alignment, the handle can be used for adjustment. Hook the handle on the latch bolt and push the handle up. Repeat until the door handle bolt and the latch bolt are aligned.
ADJUSTING THE DOOR SEAL:
The outer heat shield should flex when the door latch is secured. The flexing indicates that the outer door is acting as a spring and keeping the inner door properly sealed. The inner door can be rotated to adjust the amount of tension on the inner door seal. The door latch can be rotated on its bolt to adjust its position right or left in relation to the latch bolt.
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UNPACKING AND ASSEMBLY : INDUCED DRAFT FACE MOUNTED BLOWER ASSEMBLY
INDUCED DRAFT FACE MOUNTED BLOWER ASSEMBLY
Unpack the following blower assembly components:
Blower wheel and shaft key
•
Allen wrench
•
Motor (with power cord attached)
•
Motor mount plate
•
Motor mount spacer ring
•
• Motor mounting screws (4 x countersunk, socket head cap screws (SHCS)) • Motor mount gasket (approximat ely 12” in diameter x ½” thick) • Upper clean out cover and gasket (approximat ely 9” in diameter) • Bent flow stabilizer
THE MOTOR AND BLOWER ASSEMBLY IS HEAVY, APPROXIMATELY 45 LBS. DO NOT DROP AS YOU MAY SEVERELY DAMAGE IT. Each blower wheel is statically and
dynamically balanced at the factory.
1. Place the motor mount spacer ring over the shaft end of the motor and align the bolt holes with the threaded sockets on the motor body. Remove the rubber washer on the shaft of the motor if there is one.
2. Place the motor mount plate over the shaft end of the motor and align the counter sunk holes with the motor spacer ring and the threaded sockets on the motor body.
3. Insert the 4 countersunk, socket head cap screws and tighten.
4. Slide the motor mount gasket over the shaft and align the flat on the perimeter to the motor mount plate. If the holes of the gasket do not line up, flip the gasket over. The gasket only fits one way.
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UNPACKING AND ASSEMBLY : INDUCED DRAFT FACE MOUNTED BLOWER ASSEMBLY
5. Apply high temperature anti-seize lubricant to the motor shaft, place the key in the keyway, and slide the blower wheel onto the shaft, making sure that the keyway notch in the blower wheel hub aligns w ith the key on the motor shaft. If the blower wheel will not slide over the shaft, use a ½” outside wire brush (such as those used for cleaning the outside surface of copper tubes) and remove any minor burrs from the shaft of the motor. 6. Slide the blower wheel down on the shaft until the back surface of the hub is approximately 1/16” clear of the motor mount gasket. The blower wheel should turn freely without touching the gasket. The motor shaft will not protrude past the hub of the blower wheel.
7. Tighten the two set screws in the hub of the blower wheel with the supplied allen wrench to secure the wheel to the shaft. BOTH SET SCREWS MUST BE TIGHTENED.
8. Install the isolation bushings and stainless steel gasket saver before mounting the blower assembly on the blower housing. Review page 84 for isolation bushing specifics; and page 95 for gasket saver specifics. Position the blower assembly by sliding it into position on the five (5) mounting studs in the blower housing located on the front head of the GARN®. Hold the assembly in place and install the 3/8- 16 castellated nuts (those with teeth on one side). Tighten the nuts securely, compressing the motor mount gasket SLIGHTLY . 9. Manually rotate the blower wheel by hand. Access the wheel through the upper clean out. Ensure that there is no contact between the blower wheel and the blower housing. If there is contact, remove the blower assembly, adjusting the clearance between the blower wheel hub and the motor mount gasket, and repeat the assembly procedure.
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UNPACKING AND ASSEMBLY : INDUCED DRAFT FACE MOUNTED BLOWER ASSEMBLY
10. The bent flow stabilizer should be pushed as far as possible into the upper cleanout with the bend at 3 o’clock.
11.Position the upper clean out gasket and upper clean out cover on the blower housing. Hold the assembly in place and install 3/8-16 castellated nuts. Tighten the nuts securely, compressing the gasket SLIGHTLY . 12. It is now safe to temporarily plug in the blower motor to check its operation. The motor should operate without any rubbing or grinding noise. Significant air flow should exit from the exhaust flue at the rear of the GARN® WHS unit.
Review the motor manufacturer’s literature packaged with the motor for proper care and maintenance.
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INSTALLATION : UNIT PLACEMENT
D. INSTALLATION
UNIT PLACEMENT
THE UNIT MUST BE PLACED IN A ROOM WHERE THE ENTIRE FLOOR IS NON- COMBUSTIBLE.
• All GARN® WHS equipment must be placed in a sheltered, enclosed space (heated or unheated). Clearance to combustibles must be no less than 2 ” from the sides and back and 60” in front .
CLEARANCE TO COMBUSTIBLES
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INSTALLATION : UNIT PLACEMENT
CLEARANCE TO CEILING
• Vertical space requirements for access to the manway cover on top of the unit, to allow for periodic visual inspection of the inside of the GARN unit. This also facilitates entry into the GARN unit if required for cleaning.
When locating the GARN® WHS unit, consider the following carefully:
• Traffic patterns past the unit: service doors, any overhead doors, pump locations, etc. • Source of electrical power and location of electrical panel. • The routing and insulation of piping to the heating system. • Location of wood fuel storage. • Unit position considering where heat is to be delivered (i.e. distance to other buildings, etc). • Sufficient space for heating system pumps and controls. • Position and type of flue (horizontal or vertical) with reference to other nearby buildings.
NOTE:
• If installing a combustion air damper, increase the rear clearance from 8” to 24” minimum to allow sufficient room for damper installation and maintenance.
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INSTALLATION : UNIT PLACEMENT
IF UNIT IS LOCATED ABOVE GRADE WITHIN 10 ’ OF AN 8 ’ DEEP BASEMENT WALL, THE WALL WILL NEED TO BE REINFORCED IN ORDER TO PREVENT COLLAPSE OF WALL DUE TO TOTAL WEIGHT OF THE GARN® WHS UNIT. Check with your local code official if you have any questions concerning proper placement of the unit.
LOCATE THE UNIT ACCORDING TO YOUR LOCAL AIR SHED CODES. Minimum setback requirements from houses, roadways, and schools, may exist.
GARAGE PLACEMENT
Locate the GARN® WHS unit in a separate room or attached lean-to. There should be NO DIRECT connection between the garage and the GARN room. Provide a fully sealed 1 hour fire rated 5/8” shee trock wall between the GARN room and garage. The firewall must extend from floor to ceiling and for the full length of the room or lean-to. Local building and fire inspectors, as well as your insurance company have specific guidelines and often have final say as to location and construction of the GARN room and its access. Follow all local, state and national codes in the construction of the room or lean-to.
THERE MUST BE NO DIRECT CONNECTION OR PASSAGEWAY (I.E. NO WINDOW OR PERSONNEL DOOR) BETWEEN THE GARAGE AND THE GARN ROOM.
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INSTALLATION : UNIT PLACEMENT
REMOTE BUILDING PLACEMENT & SLAB REQUIREMENTS
The GARN® WHS unit must be set on a concrete slab on grade. The table below provides slab thickness requirements.
SOIL TYPE
MINIMUM SLAB REQUIREMENTS
Rock, Gravel, Compact Sand (>2000 psf)
4” thick, 3000 psi with 6 x 6 x 10/10 welded wire mesh 5 ½” thick, 3000 psi, with 6 x 6 x 10/10 welded wire mesh
Loose sand, clay (<2000 psf)
The slab width and length should at least equal the enclosure size and have reinforced edges. The maximum skid pressure for any GARN® WHS unit is 1850 psf.
GARN WHS 1000 and WHS 2000 Manual © HY-C Company LLC - September 2024
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INSTALLATION : UNIT PLACEMENT
SETTING THE UNIT
Once the location is determined, set the unit’s skids on 2” blue, pink or yellow EPS foam insulation for the WHS 2000 unit. Use 2” polyisocyanurate foil-faced Thermax® or equivalent foam insulation (do NOT use EPS foam insulation) for the WHS 1000 unit. In either case the foam must have a minimum allowable compression strength of 25 psi. The foam should be cut to the width of the skids plus a minimum of 2”. Raise each side of the tank off the ground and slide the foam under the skids. The concrete slab that supports the GARN® unit must be relatively flat. The entire flat surface may slope slightly, but skids under the unit must be fully supported over their entire area.
DO NOT USE WHITE BEADBOARD for either WHS model. It will melt and crush causing physical damage to the flue, combustion air inlet and piping system.
HOT WATER RETURN ASSEMBLY (HWRA) for units shipped after July 2018
The HWRA consists of a 24 ” long Sch 40 bare wall black steel dispersion tube factory coupled to a double tapped bushing. This specific item varies in diameter for the 1000 and 2000 models. It is not available for the WHS 3200 model. It is supplied as a separate component and must be field installed during initial set up . The HWRA is supplied as a unit, do NOT disassemble. Picture below:
In the past, the hot water supply (HWS) to the pump was always withdrawn from the upper flange on the rear head; and the water returning from the heating system was reinjected through the lower diameter welded dispersion tube on the rear head. This arrangement yielded a slightly higher HWS temperature. However, supplying the pump from the lower fitting and returning water through the upper fitting effectively increases the useable thermal storage capacity.
GARN WHS 1000 and WHS 2000 Manual © HY-C Company LLC - September 2024
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INSTALLATION : UNIT PLACEMENT
HWRA BENEFITS:
Both rear head fittings are the same size (2” FNPT) . The HWR assembly will screw into either flange from outside the tank, allowing you to choose from which fitting to feed the pump. If the HWRA screwed into the upper flange and the pump is supplied from the lower flange you will experience the following benefits. • Pump suction boiling is minimized or eliminated. Refer to page 17 of the Design Manual. • Piping to the pump is simplified thus reducing cost. • Increased useable thermal storage, especially with low flow such as radiant floor and all panel systems. • The pump will easily self-prime itself.
In either case, three very important restraints must be obeyed:
• Always supply your pump with water from the non HWRA flange using 2” pipe and minimal 45 or 90 degree elbows. • Always return water through the HWR assembly , installed in the flange not supplying the pump. • All other standard hydronic piping practices should be observed, ie: pipe sizing, shut off valves, isolation valves, die-electric unions, drains, etc. Refer to the Design Manual for additional piping information.
INSTALLATION
The HWRA is supplied as a unit, do NOT disassemble:
• For model WHS 2000 - 1.5” x 24” Sch 40 pipe threaded into a 2” x 1.5” double tapped steel bushing. • For model WHS 1000 - 1” x 24” Sch 40 pipe threaded into a 2” x 1.5” double tapped steel bushing
The HWRA assembly is inserted into one of the two 2” flange fittings located on the rear head of the GARN WHS unit so that the pipe extends into the tank . Apply Teflon® pipe dope to the 2” NPT male threads of the steel bushing before screwing it into the 2” flange. Tighten securely.
The exposed portion of the bushing includes a 1” or 1.5” NPT female thread. Thread the hot water return pipe from your heating system into the female thread of the bushing. Apply Teflon® pipe dope and tighten securely.
GARN WHS 1000 and WHS 2000 Manual © HY-C Company LLC - September 2024
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