Cleanout Cover Gaskets: (as necessary)
USE ONLY REPLACEMENT GASKETS PROVIDED BY DECTRA FOR GARN® WHS UNITS. Use of another type of gasket material could cause damage to the unit or blower motor, and
may result in carbon monoxide release or a fire hazard.
High heat resistant, insulating semi- rigid ½” thick gaskets are used at the following locations on the GARN® WHS: induced draft blower assembly; upper cleanout port; two lower cleanout ports and (on vertical flue models) a rear cleanout. Replacement gaskets can be ordered from your GARN® dealer or at www.garn.com. The gaskets serve two very important functions :
1. To create a seal and prevent unwanted particulates and gases from entering the building.
2. To provide thermal insulation so that the high temperature exhaust gases do not create a fire hazard or destroy the induced draft motor’s bearings or windings.
The gaskets are sandwiched between a steel cover plate and the tank or blower housing. Gaskets require periodic inspection as they may wear over time or fail. Two primary modes of failure exist:
Erosion Damage This is caused by the impact abrasion of high velocity fine ash particles carried with the exhaust gases. The lower cleanout cover gaskets and the gasket for the draft inducer motor may occasionally experience this condition. To minimize this abrasion at the lower left cleanout, a thin disk of sheet metal is installed as a shield between the gasket and the tank wall.
The disk resists abrasion while the perimeter provides a seal. To install the shield: center it on the insulation gasket and tape it with masking tape; place the gasket over the studs and the plate over the gasket; finally, install the nuts on the studs and snug so that the gasket makes a good seal with the tank. Physical Damage This may occur during the removal of the gasket in order to clean the heat exchanger tubes. If the clean out cover has not been removed for an extended period of time, the gasket will stick to both the tank and cover and tear.
GARN WHS 1000 and WHS 2000 Manual © HY-C Company LLC - September 2024
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