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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.

Set Gas Input Rate on Two-Stage and Variable Speed Furnaces

Furnace control boards should have already been set up to respond to individual W1 and W2 signals (see Procedure 7, No. 6). Additional
information can be found in furnace installation instructions.

1. Jumper R and W/W1 thermostat connections to call for heat.

2. Check manifold orifices for gas leaks when main burners ignite.

3. Adjust gas manifold pressure.

a. Remove caps that conceal adjustment screws for gas valve regulators. (See Fig. 22C or 22D.)

b. Adjust low-heat input rate manifold pressure for propane gas. (See kit rating plate #327697-201 Rev. B)

c. Turn low-heat adjusting screw counterclockwise (out) to decrease input rate or clockwise (in) to increase input rate.

d. Main burner flame should be clear blue, almost transparent. (See Fig. 28.)

4. Jumper R and W2 on control center thermostat connections. This keeps furnace locked in high-heat operation.

a. Adjust high-heat input rate manifold pressure for propane gas. (See kit rating plate #327697-201 Rev. B)

b. Turn high-heat adjusting screw (5/64 hex allen wrench) counterclockwise (out) to decrease input rate or clockwise (in) to increase input

rate.

c. Remove jumper across R, W1, and W2 after high-heat adjustment to terminate call for heat.

d. Replace caps that conceal gas-valve regulator adjustment screws. (See Fig. 22C or 22D.)

e. Main burner flame should be clear blue, almost transparent. (See Fig. 28.)

5. Turn setup switch LHT or SW-2 on control center to OFF position.

6. Turn furnace gas-valve switch to OFF position.

7. Turn off furnace power supply.

8. Remove manometer and reattach manifold pressure tap plug.

9. Reinstall burner enclosure front.

10. Turn furnace gas-valve switch to ON position.

11. Turn on furnace power supply.

12. Set room thermostat to call for heat.

13. Check pressure tap plug for gas leaks when main burners ignite.

14. Check for correct burner flame.

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.

PROCEDURE 11—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 not greater than 10.2

″

w.c.

→

Fig. 25—Conversion Kit Rating Plate

A04121

CONVERSION

KIT

RATING

PLATE

CARRIER

CORP.

THIS APPLIANCE HAS BEEN CONVERTED TO USE PROPANE GAS FOR FUEL.

REFER TO KIT INSTRUCTIONS FOR CONVERSION

PROCEDURES.

USE PARTS SUPPLIED BY CARRIER CORPORATION AND INSTALLED BY QUALIFIED PERSONNEL.

SEE EXISTING RATING PLATE FOR APPLIANCE MODEL NO. AND INPUT RATING.

NOTE: Furnace gas input rate on rating plate is for installations up to 2000 ft above sea level. In U.S.A. the input rating for altitudes above 2000 ft must

be derated by 2% for each 1000 ft above sea level. In Canada the input rating must be derated by 5% for altitudes of 2000 ft to 4500 ft above sea level.

FUEL USED: PROPANE GAS

INLET PRESSURE (min - max): 11.0 - 13.6 in. wc

ALTITUDE

INSTALLATION

(FT. ABOVE

SEA LEVEL)

U.S.A.

APPLIANCE MODELS

2001 *

3001

4001

5001