Start−Up, Adjustment, And Safety Check; Prime Condensate Trap With Water; Purge Gas Lines - International comfort products N9MSE0401410A Service And Technical Support Manual

SERVICE AND TECHNICAL SUPPORT MANUAL
START−UP, ADJUSTMENT, AND SAFETY
CHECK
General
1. Furnace must have a 115-v power supply properly
connected and grounded.
NOTE: Proper polarity must be maintained for 115-v wiring.
Control status indicator light flashes code 10 and furnace does
not operate if polarity is incorrect.
2. Thermostat wire connections at terminals R, W, G, and Y
must be made at 24-v terminal block on furnace control.
3. Natural gas service pressure must not exceed 0.5 psig
(14- in. w.c.), but must be no less than 0.16 psig (4.5-in.
w.c.).
4. Blower door must be in place to complete 115-v electrical
circuit to furnace.
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in intermittent unit
operation or performance satisfaction.
These furnaces are equipped with a manual reset limit
switch in burner assembly. This switch opens and shuts off
power to the gas valve if an overheat condition (flame
rollout) occurs in burner assembly.
combustion−air supply or improper venting condition before
resetting switch. DO NOT jumper this switch.
Before operating furnace, check flame rollout manual reset
switch for continuity. If necessary, press button to reset switch.
EAC terminal is energized whenever blower operates. HUM
24VAC: The HUM 24VAC terminal is energized when there is a
call for heat (W) and the pressure switch (LPS) closes. HUM:
The HUM terminal (115VAC) is energized when the inducer
motor is energized (IDR).

Prime Condensate Trap with Water

CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in intermittent unit
operation or performance satisfaction.
Condensate trap must be PRIMED or proper draining may
not occur. The condensate trap has two internal
chambers which can ONLY be primed by pouring water
into the inducer drain side of condensate trap.
1. Remove upper and middle collector box drain plugs
opposite of the condensate trap. (See Figure 1)
2. Connect field-supplied 1/2-in. (13 mm) OD tube to upper
collector box drain connection.
3. Insert field-supplied funnel into tube.
4. Pour one quart of water into funnel/tube. Water should
run through collector box, overfill condensate trap, and
flow into open field drain.
5. Remove funnel; replace collector box drain plug.
6. Connect field-supplied 1/2-in. (13 mm) OD tube to middle
collector box drain port.
7. Pour one quart of water into funnel/tube. Water should
run through collector box, overfill condensate trap, and
flow into open field drain.
8. Remove funnel and tube from collector box and replace
collector box drain plug.
4
Figure 1

Purge Gas Lines

Correct inadequate
If not previously done, purge the lines after all connections
have been made and check for leaks.
Adjustments
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death and/or property damage.
DO NOT bottom out gas valve regulator adjusting screw.
This can result in unregulated manifold pressure and result
in excess overfire and heat exchanger failures.
Specifications subject to change without notice.
Priming Condensate Drain
Representative drawing only, some models may vary in appearance.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Never purge a gas line into a combustion chamber. Never
test for gas leaks with an open flame. Use a commercially
available soap solution made specifically for the detection
of leaks to check all connections. A fire or explosion may
result causing property damage, personal injury or loss of
life.
WARNING
!
CAUTION
!
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in reduced furnace
life.
DO NOT redrill orifices.
out−of−round holes, etc.) can cause excessive burner
noise and misdirection of burner flames. This can result in
flame impingement of heat exchangers, causing failures.
(See Figure 2)
Gas Furnace: N9MSE
L11F065
Improper drilling (burrs,
440 04 4401 00