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N92MSN: Installation, Start-up, Operating and Service and Maintenance Instructions
SERVICE LABEL
START-UP, ADJUSTMENT, AND SAFETY
CHECK
General
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in intermittent unit operation
or performance dissatisfaction.
These furnaces are equipped with a manual reset limit switch in burner
assembly. This switch opens and shuts off power to the gas valve is an
overheat
condition
(flame
assembly/enclosure.
Correct
improper gas pressure setting, improper burner or gas orifice
positioning or improper venting condition before resetting switch. DO
NOT jumper this switch.
l
!
IMPORTANT INSTALLATION AND START-UP
PROCEDURES
Failure to follow this procedure may result in a nuisance smoke or odor
complaint.
The manifold pressure, gas rate by meter clocking, temperature rise and
operation must be checked after installation. Minor smoke and odor
may be present temporarily after start-up from the manufacturing
process. Some occupants are more sensitive to this minor smoke and
odor. It is recommended that doors and windows be open during the
first heat cycle.
1. Maintain 115-V wiring and ground. Improper polarity will result in
rapid flashing control diagnostic light and Status code (10.1) is
displayed. The furnace will NOT operate.
2. Make thermostat wire connections at the 24-V terminal block on
the furnace control. Failure to make proper connections will result
in improper operation.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Scan QR code or reference troubleshooting guide in installation manual.
The major status code is displayed in the first 2 digits of the display. The minor status
code is displayed in the third digit . The major status code is also displayed on the
LED indicator through the door with the first digit being the number of short flashes
and the second digit being the number of long flashes.
Major Minor
Description
Major Minor
Description
Main program invalid,
10
1
using backup program
L1 polarity fault
Rapid flash
to operate. Reprogram
4
LED
control to correct
issue. Control still
12
1
W on at power up
operates normally.
Limit Lockout -
Installer settings
switch open longer
1
13
corrupted.Try
than 3 minutes in
reselecting installer
Main Limit circuit
5
settings, or reprogram
Ignition Lockout
control. Control will
1
after 4 consecutive
25
operate using default
ignition tries
installer settings.
Flame lost 3 times
2
14
Wrong program for
after 70s of heating
control used -
Lockout - 7 loss of
reprogram control so
3
6
flame events during
program matches
a heat request
control used. No
heating operation.
24VAC sensed on
21
gas valve when
1
Non-Condensing
7
shouldn't be
program detected in
a Condensing model.
False flame
22
1
If program in furnace control
Stuck closed Main
1
is missing, not recognized,
pressure switch
23
or corrupted. Reprogram
Stuck closed
Reprogram control with
2
secondary pressure
correct program # as listed
switch
on the rating plate.Replace
1
Fuse fault
control if issue remains.
24
No program info in
Program in super
micro, no heating
1
1
plug is missing, not
operation.
recognized, or
Corrupted program
file, reprogram
corrupted. Remove
27
2
control using service
super plug then
2
app or super plug
retry. If still have 27
(supplied
code, try a different
separately), no
super plug. If still
25
3
heating operation.
fails, replace control.
Twinned units are
not identical,
Open secondary
program #'s do not
2
pressure switch (HPS)
match. Ensure
furnaces are
3
Secondary PS
identical (same
31
program #)
Lockout - failed to
3
when twinning.
close secondary
Main unit will not
PS after three trials
operate heating.
Fig. 60 – Service Label Information
rollout)
occurs
in
the
inadequate combustion-air
NOTICE
Scroll through main menu by pressing the MENU/SELECT button.
Press NEXT/OPTION button to view current setting (will flash on
display) and to scroll through setting options. Press
MENU/SELECT button to save new setting and return to main
menu. The display will flash to confirm setting selection before
Major Minor
Description
returning to the main menu.
Open Main pressure
32
1
SYSTEM STATUS
switch (LPS)
A switch has opened in
DESCRIPTION
DISPLAY
33
1
the Main Limit circuit.
Idle / Stand by
Ignition fault - during
iDL
Mode
1
four consecutive
ignition trials.
HT
Heating Mode
After successful
ignition (flame proven)
34
flame loss before
2
CL
Cooling Mode
heating blower on
delay.
Heat Pump Defrost
After successful
HPd
Mode
ignition (flame proven)
3
flame loss after heating
blower on delay.
Continuous Fan
CFn
Control failure – flame
Mode
circuit fault, memory
1
mismatch or sequence
Secondary Unit
error.
Operating Blower
bLr
Control failure – gas
during CFn, CL,
45
2
valve relay will not
or HT
close.
Control failure
##.#
Active Status Code
3
– EEPROM memory
issue.
COMPONENT TEST
For code 45, cycle power, if
code 45 repeats, replace
To initiate the component test sequence, the control must be in (idl) mode. No
control.
thermostat demands (W, Y, G). Select component test (Ct) from menu select
buttons to start the component test sequence. Once initiated the furnace control
Momentary loss of
will perform the following sequence:
46
1
power
1. PUr- Inducer ON (remains ON for test).
2. HSI- After waiting 10s, HSI ON for 15 seconds.
3. Fn- After HSI, then Blower ON for 10 seconds.
4. End- After Blower, Inducer ON for 10 more
seconds.
The test ends.
All copyrighted materials used herein are the property of their
respective owners.
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. Natural gas service pressure must not exceed 0.5 psig (14- in. w.c.,
350 Pa), but must be no less than 0.16 psig (4.5-in. w.c., 1125 Pa).
6. Blower door must be in place to complete 115-V electrical circuit
and supply power to the furnace components.
CUT HAZARD
Failure to follow this caution may result in personal injury.
burner
Sheet metal parts may have sharp edges or burrs. Use care and wear
supply,
appropriate protective clothing, safety glasses and gloves when
handling parts and servicing furnaces.
Start-Up Procedures
1. Purge gas lines after all connections have been made.
2. Check gas lines for leaks.
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. Do not touch uninsulated electrical components when
manually closing this switch. for service purposes.
3. To Begin Component Self-Test
a. Remove thermostat wire connected to R terminal on control to
ensure no thermostat demands are present.
b. Temporarily depress blower door switch to power the control
board to complete component self-test.
52
MAIN MENU
DESCRIPTION
DISPLAY
idL,Ht,...
Current System Status
Flt
Last 7 faults that occured
Ht
Heating Blower speed
CL
Cooling and Heat Pump Blower speed
CFn
Continuous Fan speed
Hod
Heat OFF delay
Cod
Cool OFF delay
Dir
Orientation upflow or downflow
tnn
Twinning Main or Secondary
inF
Program # and Software version
Ct
Component test
Reset All Installer Settings to
r5t
Factory Defaults
CAUTION
!
WARNING
!
A210798
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