k. Multiply gas rate cu ft/hr by heating value (Btu/cu ft).
l. Turn setup switch SW-2 to OFF position and jumper R and W2 thermostat connections. (See Fig. 16.) This keeps furnace locked in
high-heat operation. Repeat items h through k for high-heat operation.
EXAMPLE: (High-heat operation for all models at 0—2000 ft altitude)
Furnace input from rating plate is 100,000 Btuh.
Btu heating input = Btu/cu ft X cu ft/hr
Heating value of gas = 975 Btu/cu ft
Time for 1 revolution of 2-cu ft dial = 70 sec
Gas rate = 103 cu ft/hr (from Table 5)
Btu heating input = 103 X 975 = 100,425 Btuh
In this example, the orifice size and manifold pressure adjustment is within
±
2 percent of the furnace input rate.
NOTE:
Measured gas inputs (high heat and low heat) must be within
±
2 percent of that stated on furnace rating plate when installed at sea level
or derated per that stated above when installed at higher altitudes.
4. Remove jumper across R, W/W1, and W2 thermostat connections to terminate call for heat.
5. Turn furnace gas valve control knob or electric switch to OFF position.
6. Turn off furnace power supply.
7. Remove manometer and reattach manifold pressure tap plug. (See Fig. 10 and 17.)
8. Turn furnace gas valve control knob or electric switch to ON position.
9. Turn on furnace power supply.
10. Set room thermostat to call for heat.
11. Check pressure tap plug for gas leaks when main burners ignite.
12. Check for correct burner flame. (See Fig. 18.)
13. Observe unit operation through 2 complete heating cycles. See sequence of operation in furnace Installation, Start-Up, and Operating
Instructions.
14. Set room thermostat to desired temperature.
PROCEDURE 7—LABEL APPLICATION
NOTE:
See Fig. 9 for label location.
1. Fill in Conversion Responsibility Label (321201-104) and apply inside furnace as shown. Date, name, and address of organization making
this conversion are required.
2. Attach Furnace Conversion Rating Plate (323870-101) to burner enclosure front as shown.
3. Check for correct normal operating sequence of ignition system as described in furnace Installation, Start-Up, and Operating Instructions.
4. Reinstall main furnace door.
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