13. Check pressure tap plug for gas leaks when main burners ignite.
14. When correct input is obtained, main burner flame should be clear blue, almost transparent. (See Fig. 28.)
15. Observe unit operation through 2 complete heating cycles. See sequence of operation in furnace Installation, Start-Up, and Operating
Instructions.
16. Set room thermostat to desired temperature. Go to Procedure 8.
PROCEDURE 8—CHECK LOW GAS PRESSURE SWITCH OPERATION
The newly installed low gas pressure switch is a safety device used to guard against adverse burner operating characteristics that can result from
low gas supply pressure. Switch opens at not less than 6.5
″
w.c. and closes at no greater than 10.2
″
w.c.
This switch also prevents operation when the propane tank level is low which can result in gas with a high concentration of impurities, additives,
and residues that have settled to the bottom of the tank. Operation under these conditions can cause harm to the heat exchanger system. This
normally open switch closes when gas is supplied to gas valve under normal operating pressure. The closed switch completes control circuit.
Should an interruption or reduction in gas supply occur, the gas pressure at switch drops below low gas pressure switch setting, and switch opens.
Any interruption in control circuit (in which low gas pressure switch is wired) quickly closes gas valve and stops gas flow to burners.
When normal gas pressure is restored, the system must be electrically reset to reestablish normal heating operation. Before leaving installation,
observe unit operation through 2 complete heating cycles. During this time, turn gas supply to gas valve off just long enough to completely
extinguish burner flame, then instantly restore full gas supply. To ensure proper low gas pressure switch operation, observe that there is no gas
supply to burners until after hot surface igniter begins glowing.
PROCEDURE 9—LABEL APPLICATION (SEE FIG. 12A AND 12B)
1. Fill in Conversion Responsibility Label (327697-205) and apply to inside of furnace as shown. Date, name, and address of organization
making this conversion are required.
2. Attach Conversion Rating Plate Label # 327697-206 (Single-Stage) or #327697-207 (Two-Stage) near existing furnace rating plate.
3. Apply Gas Control Conversion Label:
a. For single-stage gas valve apply label 327697-203 to gas valve. (Do not use 327697-202, which is similar)
b. For two-stage gas valve apply label 327697-202 to gas valve. (Do not use 327697-203, which is similar)
—19—
