2) Place the new or existing mat and heat shield around primary air nozzle. Feel around the air nozzle to insure the mat and shield are properly centered on the opening. 3) Lay a replacement ¼” mat on the bottom and along each side of the combustion chamber. 4) Beginning at the front of the combustion chamber, position the first #2 split on the bottom. Push it tight to the heat shield and center between the two sides. 5) Place two #1 splits on each side of the bottom brick. Center the #2 split so that the #1 splits are symmetric. 6) Continue by adding another bottom brick and side bricks. Repeat until all brick is installed. Small gaps are not critical.
After installation of the firebrick, any exposed pad can be trimmed flush with the brick using a sharp knife.
Secondary Reaction Chamber (SRC): (every 5 to 10 years)
USE ONLY REACTION CHAMBERS THAT ARE MANUFACTURED SPECIFICALLY FOR GARN® WHS EQUIPMENT. By substituting a material damage to the unit could result.
REVIEW THE MATERIAL SAFETY DATA SHEET (MSDS) REGARDING THE SAFE HANDLING OF THE SECONDARY REACTION CHAMBER AND MISCELLANEOUS GASKET MATERIALS.
Use the specified 3M or equivalent air purifying respirator when handling any of this material.
The SRC will last many years, but during the course of normal use it may be accidentally damaged. When the front 2” to 3” of the SRC is significantly damaged the front section should be replaced. Contact your GARN® dealer or DECTRA for a replacement.
• Reaction Chamber front only, GARN WHS 1000, 1500 and 2000 - part # P-0021 • Reaction Chamber Package (front and rear sections), GARN WHS 1000, 1500 and 2000 - part # P-0018
The Secondary Reaction Chamber (SRC) is manufactured from a fibrous material (not asbestos) with approximate dimensions of: 10” OD; 8” ID; and overall length of 24”. The SRC performs the following functions:
• Insulates the unburned hot flue gasses from the cool temperature of the water storage. • Induces proper turbulent mixing of the unburned hot flue gasses with secondary air so that secondary combustion can occur. • Provides significant retention time for the unburned hot flue gasses and secondary air to burn, consuming smoke and releasing additional energy.
WITHOUT THE SRC (OR WITH A SEVERELY DAMAGED SRC), OVERALL EFFICIENCY WILL DROP, AND THE WHS UNIT WILL SMOKE AND PRODUCE CREOSOTE LEADING TO A
HAZARDOUS FIRE CONDITION.
INSPECTION AND REPLACEMENT OF THE SECONDARY REACTION CHAMBER S ome field “trimming and fitting” may be required in order to have the cylinders slide into the steel tube. Trimming of the OD is easily accomplished with a rough file or a SUR-FORM® file. If the OD is such that the ceramic cylinders slide into place easily, then no trimming is required.
GARN WHS 1000 and WHS 2000 Manual © HY-C Company LLC - September 2024
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