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TABLE 13—ORIFICE SIZE* AND MANIFOLD PRESSURE FOR GAS INPUT RATE (CONTINUED)
(TABULATED DATA BASED ON 21,000 BTUH PER BURNER, DERATED 4 PERCENT FOR EACH 1000 FT. ABOVE SEA
AVG. GAS
ALTITUDE RANGE
HEAT VALUE
(FT.)
AT ALTITUDE
(BTU/CU FT.)
600
625
650
U.S.A.
9001 to
Only
10,000
675
700
725
If status code recall is needed, briefly remove then reconnect one main limit wire to display stored status code. On RED LED boards do not remove power or blower door before initiating status code recall. After
status code recall is completed component test will occur.
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.
11 NO PREVIOUS CODE - Stored status code is erased automatically after 72 hours. On
RED LED boards stored status codes can also be erased when power
(115 VAC or 24 VAC) to control is interrupted.
12 BLOWER ON AFTER POWER UP (115 VAC or 24 VAC)
if unit is powered up during a call for heat (R-W closed) or R-W opens during blower
on-delay.
13 LIMIT CIRCUIT LOCKOUT - Lockout occurs if the limit, draft safeguard, flame rollout, or
blocked vent switch (if used) is open longer than 3 minutes.
- Control will auto reset after three hours.
14 IGNITION LOCKOUT - Control will auto-reset after three hours. Refer to #34.
21 GAS HEATING LOCKOUT - Control will NOT auto reset.
Check for: - Mis-wired gas valve
22 ABNORMAL FLAME-PROVING SIGNAL - Flame is proved while gas valve is de-
energized. Inducer will run until fault is cleared. Check for:
- 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.
COMPONENT TEST
To initiate the component test sequence, shut OFF the room thermostat or disconnect the "R"
thermostat lead. Briefly short the TEST/TWIN terminal to the "Com 24V" terminal. Status LED
will flash code and then turn ON the inducer motor. The inducer motor will run for the entire
component test. The hot surface ignitor, blower motor fan speed (on AMBER LED boards
only) blower motor-heat speed, and blower motor-cool speed will be turned ON for 10-15
seconds each. Gas Valve and Humidifier will not be turned on.
SERVICE AND MAINTENANCE
PROCEDURES
WARNING
!
FIRE, EXPLOSION, ELECTRICAL SHOCK
HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
The ability to properly perform maintenance on this
equipment requires certain knowledge, mechanical skills,
tools, and equipment. If you do not possess these, do not
attempt to perform any maintenance on this equipment
other than those procedures recommended in the User's
Manual.
WARNING
!
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow this warning could result in personal
injury or death, or property damage.
Before servicing, disconnect all electrical power to furnace.
Verify proper operation after servicing.
0.58
Orifice
Manifold
No.
Pressure
43
2.4
43
2.3
43
2.1
48
3.6
48
3.4
49
3.7
SERVICE
LED CODE
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. If twinned, refer to twinning kit instructions.
-Blower runs for 90 seconds,
- Refer to #33.
-Defective control (valve relay)
- Leaky gas valve
327596-101 REV. B
Fig. 50 --- Service Label
LEVEL)
SPECIFIC GRAVITY OF NATURAL GAS
0.60
Orifice
Manifold
Orifice
No.
Pressure
No.
43
2.5
43
2.3
43
2.2
48
3.8
48
3.5
49
3.8
STATUS
31
PRESSURE SWITCH DID NOT CLOSE OR REOPENED - If open longer than five minutes,
inducer shuts off for 15 minutes before retry. Check for: - Excessive wind
- Proper vent sizing
- Low inducer voltage (115VAC)
- Inadequate combustion air supply
- Low inlet gas pressure (if LGPS used)
If it opens during blower on-delay period, blower will come on for the selected blower
off-delay.
33 LIMIT CIRCUIT FAULT - Indicates a limit, draft safeguard, flame rollout, or blocked vent
switch (if used) is open. 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:
- Proper vent sizing
- Loose blower wheel.
- Dirty filter or restricted duct system.
- Defective blower motor or capacitor.
- 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: - Flame sensor must not be grounded
- Oxide buildup on flame sensor (clean with fine steel wool).
- Proper flame sense microamps (.5 microamps D.C. min., 4.0 - 6.0 nominal).
- Gas valve defective or gas valve turned off
- Defective Hot Surface Ignitor
- Control ground continuity
- Low inlet gas pressure
- Inadequate flame carryover or rough ignition
- Green/Yellow wire MUST be connected to furnace sheet metal
45 CONTROL CIRCUITRY LOCKOUT Auto-reset after one hour lockout due to;
- Gas valve relay stuck open
- Flame sense circuit failure
Reset power to clear lockout. Replace control if status code repeats.
!
ELECTRICAL OPERATION HAZARD
Failure to follow this caution may result in improper
furnace operation.
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous
operation.
46
0.62
0.64
Manifold
Orifice
Pressure
No.
43
2.6
43
43
2.4
43
43
2.2
43
43
2.1
43
48
3.6
48
48
3.4
48
- Defective inducer motor
- Defective pressure switch
- Disconnected or obstructed pressure tubing
- Restricted vent
- Restricted vent
- Excessive wind
- Defective switch or connections.
- Manual valve shut-off
- Software check error
CAUTION
Manifold
Pressure
2.7
2.5
2.3
2.1
3.7
3.5
A04223
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