GPG14M Installation Manual

15
12. Retest for leaks. If bubbles form, SHUT DOWN GAS AND
REPAIR LEAKS IMMEDIATELY.
13. Turn ON electrical power and gas supply to the system.
14. Turn valve switch ON.
GAS MANIFOLD PRESSURE MEASUREMENT AND ADJUSTMENT
T O PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE , THE
I
NLET GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON THE UNIT
RATING PLATE WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES
OPERATING .
CAUTION
This valve is shipped from the factory with the regulator preset
(see control label).
Consult the appliance rating plate to ensure burner manifold pres-
sure is as specified. If another outlet pressure is required, follow
these steps.
1. Turn OFF gas to furnace at the manual gas shutoff valve
external to the furnace.
2. Turn OFF all electrical power to the system.
3. Outlet pressure tap connections:
a. Honeywell VR8215 valve:
Remove the outlet pressure boss plug. Install an 1/8”
NPT hose barb fitting into the outlet pressure tap.
b. White-Rodgers 36G22 or 36G54 valve:
Back outlet pressure test screw (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 place unit into a heating cycle.
Single Stage Models (Honeywell VR8215 and White-
Rodgers 36G22 valves): Close thermostat “R” and “W”
contacts.
Two-Stage Models (White-Rodgers 36G54 valve): Close
thermostat contacts “R” and “W1” contacts for low heat
stage heating ONLY; do not energize high stage heat.
7. Using a leak detection solution or soap suds, check for
leaks at outlet pressure boss plug (Honeywell valve) or
screw (White-Rodgers valve). Bubbles forming indicate a
leak. SHUT OFF GAS AND REPAIR ALL LEAKS
IMMEDIATELY!
8. Measure the gas manifold pressure with burners firing.
Adjust manifold pressure using the Manifold Gas Pressure
table shown below.
9. Regulator adjustment:
Single Stage Models (Honeywell VR8215 and White-
Rodgers 36G22 valves):
Remove regulator cover screw from the outlet pressure
regulator and turn screw clockwise to increase pressure
or counterclockwise to decrease pressure. Replace
regulator cover screw.
Two-Stage Models (White-Rodgers 36G54 valve):
Remove regulator cover screw from the low (LO) outlet
pressure regulator adjust tower and turn screw clockwise
to increase pressure, or counterclockwise to decrease
pressure.
Entergize the “R”, “W1”, and “W2” contacts for high stage
heat. Remove regulator cover screw from the HI outlet
pressure regulator adjust tower and turn screw clockwise
to increase pressure or counterclockwise to decrease
pressure.
Range Nominal
Low St age 1.6 - 2.2" w .c. 2.0" w .c.
High o r Si ngle St age 3.2 - 3.8" w.c. 3.5" w .c.
Low St age 5.7 - 6.3" w .c. 6.0" w .c.
High or Single Stage 9.7 - 10.3" w.c. 10.0" w.c.
M anifold Gas Pressure
Gas
Natural
LP
10.Turn OFF all electrical power and gas supply to the system.
11. Remove the manometer hose from the hose barb fitting
or outlet pressure boss.
12.Replace outlet pressure tap:
a. Honeywell VR8215 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.
b. White-Rodgers 36G22 or 36G54 valve: Turn outlet
pressure test screw in to seal pressure port (clockwise,
7 in-lb minimum).
13.Turn ON electrical power and gas supply to the system.
14.Close thermostat contacts to provide a call for heat.
15.Retest for leaks. If bubbles form, SHUT OFF GAS AND
REPAIR ALL LEAKS IMMEDIATELY!
Gas Input (Natural Gas Only) Check
To measure the gas input use a gas meter and proceed as
follows:
1. Turn off gas supply to all other appliances except the unit.
2. With the unit operating, time the smallest dial on the meter
for one complete revolution. If this is a 2 cubic foot dial,
divide the seconds by 2; if it is a 1 cubic foot dial, use the
seconds as is. This gives the seconds per cubic foot of
gas being delivered to the unit.
3. INPUT=GAS HTG VALUE x 3600 / SEC. PER CUBIC FOOT
Example: Natural gas with a heating value of 1000 BTU per cubic
foot and 34 seconds per cubic foot as determined by Step 2, then:
Input = 1000 x 3600 / 34 = 106,000 BTU per Hour. NOTE:
BTU content of the gas should be obtained from the gas
supplier. This measured input must not be greater than
shown on the unit rating plate.
4. Relight all other appliances turned off in step 1. Be sure all
pilot burners are operating.