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 competent 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 . Installer to supply and install all code required electrical over current and disconnect devices.
Table of Contents
A. SYMBOLS, ABBREVIATIONS, and safety symbols: .......................................................................................... 4
B. PROMOTING CONSERVATION AND EFFICIENCY BEFORE ANYTHING ELSE: ..................................................... 5
PROBLEMS WITH IMPROPERLY COMBUSTED FUEL: .................................................................................................5 HEATING A SWIMMING POOL: .................................................................................................................................5
C. RULES OF THUMB FOR AN INITIAL ESTIMATE OF EQUIPMENT SIZE ............................................................... 6
COMMERCIAL HEAT LOSS: ........................................................................................................................................6 RESIDENTIAL HEAT LOSS EXCLUDING VENTILATION:................................................................................................6 RESIDENTIAL VENTILATION:......................................................................................................................................6 RESIDENTIAL DOMESTIC WATER HEATING: ..............................................................................................................7 HOT TUB HEATING: ...................................................................................................................................................7 RADIANT FLOOR HEATING: .......................................................................................................................................7 FORCED AIR HEATING: ..............................................................................................................................................8 HOT WATER BASEBOARD HEATING: .........................................................................................................................9 GLYCOL CORRECTION FACTORS AND FREEZE PROTECTION TABLES:......................................................................10 The difference between freeze and burst protection: (DOW Chemical)..............................................................11 PUMP LAWS AND FAN LAWS: .................................................................................................................................11
D. PIPING AND PUMP SIZING ........................................................................................................................... 12
PIPING DESIGN AND CALULCATION GUIDELINES....................................................................................................12 EQUIVALENT FEET OF PIPE FOR SCREWED FITTINGS AND VALVES.....................................................................12 EQUIVALENT FEET OF PIPE FOR PEX FITTINGS ....................................................................................................13 Flow and heat capacity @ 4' of head loss per 100' of pipe length ......................................................................13 Flow and heat capacity @ 6' of head loss per 100' of pipe length ......................................................................14 PRESSURE LOSS CHARTS: STEEL, COPPER, PEX....................................................................................................15 PIPING INSTALLATION AND HOOKUP GUIDELINES .................................................................................................16 PLUMBING WITH COPPER:..................................................................................................................................16 PLUMBING WITH STEEL: .....................................................................................................................................16 CALCULATION OF NET POSITIVE SUCTION HEAD FOR PUMPS ...............................................................................17 UNDERGROUND PIPING: ......................................................................................................................................... 19 DRY AREA BURIED PIPING DIAGRAM: .................................................................................................................19 MOIST AREA BURIED PIPING DIAGRAM:.............................................................................................................20 ROADWAY AND PARKING LOT BURIED PIPING DIAGRAM: .................................................................................21 PUMP SELECTION AND INSTALLATION GUIDELINES: ..............................................................................................21
E. SYSTEM DISTRIBUTION CONNECTION AND SCHEMATICS ............................................................................ 23
ZERO PRESSURE, FIXED TEMP - PRIMARY ONLY PUMPING: ...................................................................................23 ZERO PRESSURE, FIXED SUPPLY TEMP – PRIMARY SECONDARY PUMPING: ..........................................................24 ZERO PRESSURE, MULTIPLE ZONE – PRIMARY SECONDARY PUMPING:.................................................................25 CONNECTING TO AN EXISTING PRESSURIZED OR GLYCOL TREATED DISTRIBUTION SYSTEM: ...............................27
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Hydronic System Design Manual ©DECTRA CORPORATION - March 2013
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