All installations and services must be performed by qualified service personnel.
NOTICE: A U-tube manometer
, measuring pressure in inches of water column,
is recommended
for all gas pressure measurements. However,
an aneroid pressure gauge
, in good working
condition, capable of reading pressure changes of 0.05 in. W.G., or less, that was
recently
calibrated
(within the last year),
is a satisfactory alternate
.
These two (2) devices will be
considered as equivalent and interchangeable. Either device is referred to below as a “pressure
gauge”
NOTICE:
This 2-stage gas valve has two separate gas pressure regulators.
Checks and
adjustments must be made at both high fire (high adjustment) and low fire (low adjustment).
1.
Shut off the gas
at the automatic gas control valve (turn gas control switch to the OFF position).
2. Remove the outlet pressure tap plug from gas burner manifold and connect a pressure gauge.
Refer to Figure 22, below.
Figure 22: Exploded View of CDX/CHX Gas Control System
3. Turn on the gas at the automatic gas control valve (turn gas control switch to the ON position).
4. Adjust the room thermostat so the furnace will
operate on low fire
only
.
41
