International comfort products N9MSE0401410A Service And Technical Support Manual page 6

SERVICE AND TECHNICAL SUPPORT MANUAL
h. 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)
i. Remove jumper R to W.
j. Re−install manifold pressure tap plug to gas valve.
WARNING
!
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Reinstall manifold pressure tap plug in gas valve to prevent
gas leak.
Figure 4 Example of Single Stage Furnace Control for PSC Blower Motor
LED OPERATION &
DIAGNOSTIC LIGHT
115−VAC (L2) NEUTRAL
SELECTION TERMINALS
6
HEAT
OFF−DELAY
J2 JUMPER
24−V THERMOSTAT
TERMINALS
HUM
24VAC
3−AMP FUSE
COM/BLUE 24VAC/RED
Ï Ï Ï
Ï Ï Ï
CONNECTIONS
Ï Ï Ï
SPARE1 SPARE2
SPARE1
BLOWER SPEED
SPARE2
SPARE3
Specifications subject to change without notice.
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.
f. Multiply gas rate cu ft./hr by heating value (Btuh/cu
ft.) to obtain input. If clocked rate does not match
required input from Step 1, increase manifold
pressure to increase input or decrease manifold
pressure to decrease input. Repeat steps b through e
until correct input is achieved. Re−install regulator
seal cap on gas valve.
TWINNING AND/OR
COMPONENT TEST
TERMINAL
HUMIDIFIER TERMINAL
(24−VAC 0.5 AMP MAX)
TRANSFORMER 24−VAC
CONNECTIONS
P1 − LOW VOLTAGE MAIN
HARNESS CONNECTOR
EAC 1 AMP
SPARE3
IND
HUM
XFMR
115 VAC
(L1) LINE
P2−HOT SURFACE IGNITOR (HSI) & INDUCER
VOLTAGE HUMIDIFIER
MOTOR (IND) CONNECTOR
CONNECTION TERMINAL
115−VAC
Gas Furnace: N9MSE
P2
HSI
440 04 4401 00
L11F090