N80ESN/N80ESL(Series A): Installation, Start–Up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
26
1. Maintain 115-v wiring and ground. Improper polarity will result in
showing a status code 10 and no furnace operation.
2. Make thermostat wire connections at the 24-v terminal block on the
furnace control. Failure to make proper connections will result in
).
3. Gas supply pressure to the furnace must be greater than 4.5-In.
W.C. (0.16 psig) but not exceed 14-In. W.C. (0.5 psig).
4. Check all manual-reset switches for continuity.
5. Install blower compartment door. Door must be in place to operate
furnace.
6. Replace outer door.
Start-Up Procedures
1. Purge gas lines after all connections have been made.
2. Check gas lines for leaks.
3. To Begin Component Self-Test:
Remove blower access door. Disconnect the thermostat R lead from
the furnace control board. Manually close the blower door switch
closed. Short (jumper) the C terminal on control to the
TEST/TWIN 3/16-inch quick connect terminal on control until
LED goes out (approximately 2 sec). Gas valve and humidifier will
not be turned on (see
).
NOTE:
The furnace control allows all components, except the gas
valve, to be run for short period of time. This feature helps diagnose a
system problem in case of a component failure. Component test feature
will not operate if any thermostat signal is present at the control.
4. Component test sequence is as follows (see service label attached to
furnace or
):
a. LED will display previous status code 4 times.
NOTE:
If no previous code is present, go directly to b.
b. Inducer motor starts and continues to run until Step f of
component test sequence.
c. Hot surface igniter is energized for 15 sec., then off.
d. Blower motor operates on HEAT speed for 10 sec.
e. Blower motor operates on COOL speed for 10 sec.
f. Inducer motor stops.
g. Reconnect R lead to furnace control board, release blower door
switch and re-install blower door.
5. Operate furnace per instruction on door.
6. Verify furnace shut down by lowering thermostat setting below
room temperature.
7. Verify furnace restarts by raising thermostat setting above room
temperature.
A190345
Fig. 44 – Service Label
CAUTION
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear
appropriate protective clothing, safety glasses and gloves when
handling parts and servicing furnaces.
WARNING
!
FIRE AND EXPLOSION HAZARD
Failure to follow this warning could cause personal injury, death and/or
property damage.
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.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury, or death.
Blower access door switch opens 115-v power to control. No
component operation can occur unless switch is closed. Caution must
be taken when manually closing this switch for service purposes.
