Whirlpool WPIO-369B Instruction Manual download pdf (Page 24)

3. Outlet pressure tap connections:

■ Honeywell VR9205 valve: Remove the outlet pressure

boss plug. Install an ¹⁄₈" NPT hose barb fitting into the

outlet pressure tap.

■ White-Rodgers 36G54 valve: Back outlet pressure test

screw (inlet/outlet pressure boss) out one turn

counterclockwise (not more than one turn).

4. Attach a hose and manometer to the outlet pressure barb

fitting (Honeywell valve) or outlet pressure boss

(White-Rodgers valve).

5. Turn on the gas supply.

6. Turn on power and close thermostat R and W1 contacts to

provide a call for low-stage heat.

7. Measure the gas manifold pressure with burners firing.

8. Adjust manifold pressure using the Manifold Gas Pressure

chart shown below.

9. Remove the regulator cover screw from the low (LO) outlet

pressure regulator adjust tower.

10. Turn the screw clockwise to increase pressure or

counterclockwise to decrease pressure.

11. Replace regulator cover screw.

12. Close thermostat R and W2 contacts to provide a call for

high-stage heat.

13. Remove the regulator cover screw from the high (HI) outlet

pressure regulator adjust tower.

14. Turn the screw clockwise to increase pressure or

counterclockwise to decrease pressure.

15. Replace the regulator cover screw.

16. Turn off all electrical power and gas supply to the system.

17. Remove the manometer hose from the hose barb fitting or

outlet pressure boss.

18. Replace the outlet pressure tap:

■ Honeywell VR9205 valve: Remove the ¹⁄₈" NPT hose barb

fitting from the outlet pressure tap. Replace the outlet

pressure boss plug and seal with a high quality thread

sealer.

■ White-Rodgers 36G54 valve: Turn the outlet pressure test

screw in to seal pressure port (clockwise, 7 in.-lb

minimum).

19. Turn on electrical power and gas supply to the system.

20. Close the thermostat contacts R and W1/W2 to energize the

valve.

21. Using a leak detection solution or soap suds, check for leaks

at the outlet pressure boss plug (Honeywell valve) or screw

(White-Rodgers valve). Bubbles forming indicate a leak.

IMPORTANT: If a leak is detected, turn off gas immediately

and repair all leaks.

NOTE: For gas-to-gas conversion, consult your dealer for

appropriate conversion.

Gas Input Rate Measurement—Natural Gas Only

The gas input rate to the furnace must never be greater than that

specified on the unit rating plate. To measure Natural gas input

using the gas meter, use the following procedure.

1. Turn off the gas supply to all other gas-burning appliances

except the furnace.

2. While the furnace is operating, time and record one complete

revolution of the smallest gas meter dial.

3. Calculate the number of seconds per cubic foot (sec/ft

) of

gas being delivered to the furnace. If the dial is a 1 cubic foot

dial, divide the number of seconds recorded in Step 2 by 1. If

the dial is a 2 cubic foot dial, divide the number of seconds

recorded in Step 2 by 2.

4. Calculate the furnace input in Btu per hour (Btu/h). Input

equals the sum of the installation’s gas heating value and a

conversion factor (hours to seconds) divided by the number

of seconds per cubic foot. The measured input must not be

greater than the input indicated on the unit rating plate.

Example: Installation’s gas heating (HTG) value: 1,000 Btu/ft

(Obtained from gas supplier)

Installation’s seconds per cubic foot: 34 sec/ft

Conversion Factor (hours to seconds): 3,600 sec/h

Input = (Htg. value x 3,600) ÷ seconds per cubic foot

Input = (1,000 Btu/ft

x 3,600 sec/h) ÷ 34 sec/ft

Input = 106,000 Btu/h

Minor changes to the input rate may be accomplished through

manifold pressure adjustments at the gas control valve. Refer to

“Gas Manifold Pressure Measurement and Adjustment” section

for details.

NOTE: The final manifold pressure cannot vary by more than ±

0.3" W.C. from the specified setting. Consult your local gas

supplier if additional input rate adjustment is required.

5. Repeat steps 2 through 4 on high stage.

6. Turn on the gas supply to all other appliances turned off in

Step 1.

7. Ensure that all appliances are functioning properly and that all

pilot burners are lit and operating.

Temperature Rise

Temperature rise must be within the range specified on the unit

rating plate. An incorrect temperature rise may result in

condensing in or overheating of the heat exchanger. An airflow

and temperature rise table is provided in the Specification Sheet

applicable to your model. Determine and adjust temperature rise

as follows:

1. Operate furnace with burners firing for approximately

10 minutes.

2. Ensure that all registers are open and all duct dampers are in

their final (fully or partially open) position.

3. Place thermometers in the return and supply ducts as close

to the furnace as possible. Thermometers must not be

influenced by radiant heat from the heat exchanger.

Manifold Gas Pressure

Gas Range Nominal

Natural Low Stage 1.6" to 2.2" W.C. 1.9" W.C.

High Stage 3.2" to 3.8" W.C. 3.5" W.C.

Propane Low Stage 5.7" to 6.3" W.C. 6.0" W.C.

High Stage 9.7" to 10.3" W.C. 10.0" W.C.

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Whirlpool WPIO-369B Instruction Manual Page 24

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