International comfort products N9MSE0261408 Service And Technical Support Manual page 8

SERVICE AND TECHNICAL SUPPORT MANUAL
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.
g. 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 of Step 1 until correct heat
input is achieved. Re--install regulator seal cap on
gas valve.
3. Restore furnace to normal operating condition.
a. Turn gas valve ON/OFF switch to OFF.
b. Remove water column manometer or similar device
from manifold pressure tap.
Figure 4 Example of Single Stage Furnace Control for PSC Blower Motor
115−VAC (L2) NEUTRAL
SELECTION TERMINALS
8
J2 JUMPER
OFF−DELAY
24−V THERMOSTAT
TERMINALS
HUM
24VAC
3−AMP FUSE
COM/BLUE 24VAC/RED
LED OPERATION &
Ï Ï Ï
DIAGNOSTIC LIGHT
Ï Ï Ï
CONNECTIONS
Ï Ï Ï
Ï Ï Ï
SPARE1 SPARE2
SPARE1
BLOWER SPEED
SPARE2
SPARE3
Specifications subject to change without notice.
c. Tighten set screw on manifold tower pressure tap
with 3/32−in. hex wrench, or if 1/8−in. NPT plug was
removed, apply pipe dope sparingly to end of plug
and reinstall in the gas valve.
d. Turn gas valve ON/OFF switch to ON.
e. Check for gas leaks and verify furnace operation
WARNING
!
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Manifold pressure tap set screw must be tightened and
1/8−in. NPT pipe plug must be installed to prevent gas
leaks.
HEAT
COMPONENT TEST
TERMINAL
HUMIDIFIER TERMINAL
(24−VAC 0.5 AMP MAX)
TRANSFORMER 24−VAC
CONNECTIONS
P1 − LOW VOLTAGE MAIN
HARNESS CONNECTOR
EAC 1 AMP
1−AMP@115VAC
XFMR
SPARE3
HUM
115 VAC
(L1) LINE
VOLTAGE HUMIDIFIER
CONNECTION TERMINAL
115−VAC
Gas Furnace: N9MSE
P2
IND
HSI
P2−HOT SURFACE IGNITOR (HSI) & INDUCER
MOTOR (IND) CONNECTOR
440 04 4402 07
L13F013