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Table 10 – Furnace Setup Switch Description
SETUP SWITCH
NO.
SWITCH N AME
NORMAL
POSITION
DESCRIPTION OF USE
SW1 --- 1 Status Code Recovery OFF
Turn ON to retrieve up to 7 stored status codes for troubleshooting as-
sistance when R thermostat lead is disconnected.
SW1 --- 2 Adaptive Heat Mode OFF
Allows 2---stage operation with a s ingle stage thermostat. Turn ON when
using 2 s tage t hermostat to al l ow Low Heat operation when R to W/W1
closes and High Heat operation when R to W/W1 and W2 close.
SW1 --- 3 Low Heat Rise Adjust OFF
Turn ON to increase Low Heat airflow by 18 percent. This compensates
for increased return air temperature caused with bypass humidifier.
SW1 --- 4
Comfort/Efficiency Ad-
justment
ON
Turn ON to decrease Low Heat airflow by 16 percent and High Heat
airflow 10 percent for maximum comfort.
SW1 --- 5 CFM per ton adjust OFF Turn ON for 400 CFM per ton . Turn OFF for 350 CF M per ton.
SW1 --- 6 Component Self---Test OFF
Turn ON to initiate Component Self---Test for troubleshooting assistance
when R thermostat lead is disconnected. Turn OFF when Self---Test is
completed.
SW1 --- 7 Blower OFF delay ON or OFF
Control blower Off Delay time. Used in conjunction with SW1---8. See
Table 11.
SW1 --- 8 Blower OFF delay ON or OFF
Control blower Off Delay time. Used in conjunction with SW1---7. See
Table 11.
To initiate the component test sequence, shut
OFF the room thermostat or disconnect the "R"
thermostat lead. Reset power and then put setup
switch "SW1-6" in the ON position to start the
component test sequence. Once initiated the
furnace control will turn the inducer ON at high-
heat speed. The inducer motor will run for the
entire test. The hot surface igniter and blower
motor will be turned ON for 15 seconds each.
When the blower is turned OFF the inducer will
be switched to low-speed for 10 seconds. When
the component test is completed one or more of
the following codes will flash.
LED CODE
EACH OF THE FOLLOWING STATUS CODES IS A TWO DIGIT NUMBER WITH THE FIRST DIGIT DETERMINED BY THE NUMBER OF SHORT FLASHES AND THE SECOND DIGIT BY THE NUMBER OF LONG FLASHES.
STATUS
If status code recall is needed disconnect the "R" thermostat lead, reset power, and put setup switch "SW1-1" in the ON
position. To cl ear the status code history put setup switch "SW1-1" in the ON position and jumper thermostat terminals "R",
"W/W1", and "Y/Y2" simultaneously until status code #11 is flashed.
COMPONENT TEST
328787-101 REV. A
CODE
DESCRIPTION
SERVICE
32 Continued: Check for: - Low inducer voltage (115 VAC)
- Defective inducer motor - Inadequate combustion air supply
- Defective pressure switch - Low inlet gas pressure (if LGPS used)
- Low inducer voltage (115 VAC)
- Disconnected or obstructed pressure tubing
33 LIMIT CIRCUIT FAULT - Indicates a limit, draft safeguard, flame rollout, or
blocked vent switch (if used) is open or the furnace is operating in high-heat
only mode due to 2 successive low heat limit trips. Blower will run for 4
minutes or until open switch remakes whichever is longer. If open longer
than 3 minutes, code changes to lockout #13. If open less than 3 minutes
status code #33 continues to flash until blower shuts off. Flame rollout switch
and BVSS require manual reset. Check for: - Loose blower wheel
- Restricted vent - Proper vent sizing - Excessive wind
- Dirty filter or restricted duct system - Defective switch or connections
- Inadequate combustion air supply (Flame Roll-out Switch open)
34 IGNITION PROVING FAILURE - Control will try three more times before
lockout #14 occurs. If flame signal lost during blower on-delay period, blower
will come on for the selected blower off-delay. Check for:
- Oxide buildup on flame sensor (clean with fine steel wool)
- Proper flame sense microamps (.5 microamps D.C. min., 4.0 - 6.0 nominal)
- Manual valve shut-off - Low inlet gas pressure - Control ground continuity
- Gas valve defective or turned off - Flame sensor must not be grounded
- Inadequate flame carryover or rough ignition
- Green/Yellow wire MUST be connected to furnace sheet metal
41 BLOWER MOTOR FAULT - Indicates the blower failed to reach 250 RPM
or the blower failed to communicate within the prescribed times limits. Thirty
seconds after being turned ON or ten seconds during steady-state operation.
43 LOW-HEAT PRESSURE SWITCH OPEN WHILE HIGH-HEAT PRESSURE
SWITCH IS CLOSED - Check for: - Mis-wired pressure switches
- Low-heat pressure switch stuck open - Low inlet gas pressure (if LGPS used)
- Disconnected or obstructed pressure tubing
45 CONTROL CIRCUITRY LOCKOUT Auto-reset after one hour lockout due to;
- Gas valve relay stuck open - Flame sense circuit failure - Software check error
Reset power to clear lockout. Replace control if status code repeats.
11 Indicates the blower motor tested
OK. Visual check of inducer motor
and hot surface igniter required.
25 SETUP ERROR - Same as code 25 above.
41 BLOWER MOTOR FAULT - Indicates
blower motor failed test. Check
blower, wiring, and furnace control.
To repeat component test turn setup switch
"SW1-6" OFF and then back ON. After component
test is completed put setup switch "SW1-6" in the
OFF position and reconnect the "R" thermostat
lead.
CONTINUOUS OFF - Check for 115VAC at L1 and L2, and 24VAC at SEC-1 and SEC-2.
CONTINUOUS ON - Control has 24VAC power.
RAPID FLASHING - Line voltage (115VAC) polarity reversed.
11 NO PREVIOUS CODE - Stored status codes are erased automatically after 72
hours or as specified above.
12 BLOWER ON AFTER POWER UP (115 VAC or 24 VAC) -Blower runs for 90
seconds, if unit is powered up during a call for heat (R-W/W1 closed) or
(R-W/W1 opens) during blower on-delay period.
13 LIMIT CIRCUIT LOCKOUT - Lockout occurs if a limit, draft safeguard, flame
rollout, or blocked vent switch (if used) is open longer than 3 minutes or 10
successive limit trips occurred during high-heat. Control will auto reset after
three hours. Refer to status code #33.
14 IGNITION LOCKOUT - Control will auto-reset after three hours. Refer to status
code #34.
15 BLOWER MOTOR LOCKOUT - Indicates the blower failed to reach 250 RPM or
the blower failed to communicate within 30 seconds after being turned ON in two
successive heating cycles. Control will auto reset after 3 hours.
Refer to status code #41.
21 GAS HEATING LOCKOUT - Control will NOT auto reset. Check for:
- Mis-wired gas valve -Defective control (valve relay)
22 ABNORMAL FLAME-PROVING SIGNAL - Flame is proved while gas valve is
de-energized. Inducer will run until fault is cleared. Check for:
- Leaky gas valve - Stuck-open gas valve
23 PRESSURE SWITCH DID NOT OPEN Check for:
- Obstructed pressure tubing - Pressure switch stuck closed
24 SECONDARY VOLTAGE FUSE IS OPEN Check for: - Short circuit in secondary
voltage (24VAC) wiring.
25 INVALID MODEL SELECTION OR SETUP ERROR - Indicates either the model
plug is missing or incorrect or, setup switch "SW1-1" or "SW1-6" is positioned
improperly. If code flashes 4 times on power-up control is defaulting to model
selection stored in memory.Check for: -Thermostat call with SW1-1, SW1-6 or
both SW1-1 & SW1-6 ON. - Board date code 2103 or later required to recognize model
plug 007. - Proper model plug number and resistance values per wiring diagram
31 HIGH-HEAT PRESSURE SWITCH OR RELAY DID NOT CLOSE OR
REOPENED - Control relay may be defective. Refer to status code #32.
32 LOW-HEAT PRESSURE SWITCH DID NOT CLOSE OR REOPENED - If open
longer than five minutes, inducer shuts off for 15 minutes before retry. If opens
during blower on-delay period, blower will come on for the selected blower
off-delay. Check for: - Excessive wind - Restricted vent - Proper vent sizing
A04015
Fig. 52 -- Service Label
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.
!
WARNING
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in reduced furnace
life.
DO NOT redrill orifices. Improper drilling (burrs,
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 Fig.
50.)
CAUTION
!
Furnace gas input rate on rating plate is for installations at
altitudes up to 2000 Ft. (610 M). Furnace input rate must be
within +/--2 percent of furnace rating plate input. For altitudes
above 5500 Ft. (1676 M), a field--supplied high altitude pressure
switch is required.
1. Determine the correct gas input rate.
The input rating for altitudes above 2,000 ft. (610 M) must
be reduced by 4 percent for each 1,000 ft. (305 M) above
sea level.
For installations below 2000 Ft. (610 M), refer to the unit
rating plate. For installations above 2000 Ft. (610 M),
multiply the input on the rating plate by the de--rate multi-
plier in Table 10 for the correct input rate.
2. Determine the correct orifice and manifold pressure adjust-
ment. All models in all positions except Low NOx models
in downflow and horizontal positions use Table 14
(22,000 Btuh per burner.) Low NOx models in downflow
or horizontal positions must use Table 15 (21,000 Btuh
per burner.) See input listed on rating plate.
a. Obtain average yearly gas heat value (at installed alti-
tude) from local gas supplier.
b. Obtain average yearly gas specific gravity from local
gas supplier.
315AAV