International comfort products N9MSE0261408 Service And Technical Support Manual page 7

SERVICE AND TECHNICAL SUPPORT MANUAL
NOTICE
For 40,000 BTUH to 120,000 BTUH models. DO NOT set
manifold pressure less than 2.8−in. w.c. (697 Pa) or more than
3.8−in. w.c. (947 Pa) for natural gas. If required manifold
pressure is outside this range, change main burner orifices to
obtain manifold pressure in this range.
CAUTION
!
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in reduced furnace
life.
The 26,000 BTUH model has a lower nominal manifold
pressure than other models. Do not adjust the natural gas
manifold pressure above 1.8 in. w.c.
The 26,000 BTUH model can be identified by the green
label affixed to the solenoid of the gas valve.
Refer to the Adjustment section for setting the manifold
pressure.
USE TABLE 3 WHEN ADJUSTING 26,000 BTUH MODEL
MANIFOLD PRESSURE.
i. When correct input is obtained, replace cap that
conceal gas valve regulator adjustment screw. Main
burner flame should be clear blue, almost transparent
(See Figure 13)
j. Remove jumper R to W.
NOTE: Contact your HVAC distributor or gas supplier for metric
gas meter Tables, if required.
2. Verify natural gas input rate by clocking meter.
a. Turn off all other gas appliances and pilots served by
the meter.
b. Jumper R to W.
c. Run furnace for 3 minutes.
d. Measure time (in sec) for gas meter to complete 1
revolution and note reading. The 2 or 5 cubic feet dial
provides a more accurate measurement of gas flow.
e. Refer to Table 2 for cubic ft. of gas per hr.
Gas Valve (Single Stage) without
Figure 3
Tower Pressure Ports
ON/OFF Switch
1/2" NPT Inlet
1/8" NPT Inlet
Pressure Tap
440 04 4402 07
Gas Valve (Single Stage) with Tower Pressure
Ports
1/2" NPT
INLET PRESSURE
TAP SET SCREW:
HOSE CONNECTION
1/2" NPT
INLET
Low Capacity 26,000 BTUH Gas Valve without
Tower Pressure Ports
½" NPT Inlet
Regulator Seal Cap
Low Capacity 26,000 BTUH Gas Valve with Tower
Regulator Adjustment
Regulator Seal Cap under Cap
Pressure Ports
1/2" NPT Outlet
HOSE CONNECTION
1/8" NPT Manifold
Pressure Tap
A11153
Specifications subject to change without notice.
MANIFOLD PRESSURE TAP
SET SCREW: 3/32" HEX HEAD
ACCEPTS 5/16" HOSE CONNECTION
INLET
INP
3/32" HEX HEAD
ACCEPTS 5/16"
ON/OFF SWITCH
1/8" NPT INLET
PRESSURE TAP
Representative drawing only, some models may vary in appearance.
1/8" NPT
INLET PRESSURE TAP
Representative drawing only, some models may vary in appearance.
White Rodgers
MODEL 36J60(515
24V 50/60HZ .280 AMPS
MAX. PRESS ½ PSI
1.5" W.C.
REG, 1.5" W.C.
⅛" NPT Inlet
Pressure Tap ON/OFF Switch
MANIFOLD PRESSURE TAP
SET SCREW: 3/32" HEX HEAD
ACCEPTS 5/16" HOSE CONNECTION
1/2" NPT
INLET
INP
INLET PRESSURE
TAP SET SCREW:
3/32" HEX HEAD
ACCEPTS 5/16"
1.5"
1/8" NPT INLET
W.C
PRESSURE TAP
.
Representative drawing only, some models may vary in appearance.
Gas Furnace: N9MSE
1/2" NPT
OUTLET
OUTP
REGULATOR SEAL CAP
(REGULATOR ADJ.
UNDER CAP)
A170118
1/2" NPT
OUTLET
A170133
½" NPT Outlet
Regulator Seal Cap
Regulator Adjustment
Regulator Seal Cap
Under Cap
A170147
1/2" NPT
OUTLET
OUTP
REGULATOR SEAL CAP
ON/OFF
(REGULATOR ADJ.
SWITCH
UNDER CAP)
A170140
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