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Table 16--Orifice
Size* and Manifold Pressure in. w.c. for Gas Input Rate (Continued)
(Tabulated data based on 21,000 btuh per burner, derated 4 percent for each 1000 ft. (305 M) above sea level)
ALTITUDE
RANGE
FT. (i)
U.S.A.
U.S.A.
U.S.A.
700t to
8000
(2134to
2438)
8001to
9000
(2438to
2743)
9001to
10,000
(2743to
3048)
AVG. GAS
SPECIFIC GRAVITY OF NATURAL GAS
HEAT VALUE
0.58
0.60
0.62
AT
ALTITUDE
Orifice
Manifold
Orifice
Manifold
Orifice
Manifold
Orifice
(BTU/CU FT.)
No.
Pressure
No.
Pressure
No.
Pressure
No.
650
43
2.9
43
3.0
43
3.1
43
675
43
2.7
43
2.7
43
2.8
43
700
43
2.5
43
2.6
43
2.6
43
725
43
2.3
43
2.4
43
2.5
43
750
43
2.1
43
2.2
43
2.3
43
775
43
2.0
43
2.1
43
2.2
43
800
48
3.6
48
3.7
43
2.0
43
825
48
3.3
48
3.5
48
3.6
48
625
43
2.7
43
2.7
43
2.8
43
650
43
2.5
43
2.5
43
2.6
43
675
43
2.3
43
2.4
43
2.4
43
700
43
2.1
43
2.2
43
2.3
43
725
48
3.7
43
2.0
43
2.1
43
750
48
3.5
48
3.6
48
3.7
43
600
43
2.4
43
2.5
43
2.6
43
625
43
2.3
43
2.3
43
2.4
43
650
43
2.1
43
2.2
43
2.2
43
675
48
3.6
48
3.8
43
2.1
43
700
48
3.4
48
3.5
48
3.6
48
725
49
3.7
49
3.8
48
3.4
48
775
49
3.8
48
3.4
48
3.5
48
0.64
Manifold
Pressure
3.2
2.9
2.7
2.5
2.4
2.2
2.1
3.7
2.9
2.7
2.5
2.3
2.2
2.0
2.7
2.5
2.3
2.1
3.7
3.5
3.6
* Orifice numbers
43 are factory installed.
Figure 44 - Service Label
SERVICE
To perform status code recall/component test, the control must be in idle mode(no calls for heat, cool, or fan with the blower off) displaying a "Heartbeat". Status code recall/component test can be performed in one of two ways.:
1. Briefly (2-3 seconds) connectthe TEST/TWINterminal to the "C" thermostat terminalwith ajumper wire, (NOTE: Ifconnected for more than 4-5 seconds status code 10will flash but it will net overwrite the previousstatus code),
OR
2. Briefly removethen reconnect one limit wire (main, rollout, or draft-safeguard switch), (NOTE: If limit wire isdisconnected for more than 4-5 seconds status code 4 will flash and the previous status code will be lost).
After the status code is flashed 4 times the componenttest will begin (see "ComponentTest Sequence" below). I1 noprevious status code is available the control will not flash a status code and will immediately startthe
componenttest. Storedstatus codes are erased automaticallyafter 72 hours.
EACH OF THE FOLLOWING
STATUS CODES IS A SINGLE OR TWO DIGIT NUMBER WITH THE FIRST NUMBER DETERMINED
BY THE NUMBER OF SHORT FLASHES AND THE
SECOND
NUMBER AFTER THE PLUS (÷) SIGN IS THE NUMBER OF LONG FLASHES.
LED
STATUS
CODES
HEARTBEAT
(bright-dim)
-Control
has 24VAC power
2 PRESSURESWITCHBID NOT OPEN Check for:
- Obstructed pressure tubing.
- Pressure switch stuckclosed.
3 PRESSURESWITCH DIDNOT CLOSE OR REOPENED- Ifopen longer thanfive
minutes, inducer shuts off for 15 minutesbefore retry. Check for: - Excessivewind
- Proper vent sizing
- Defectiveinducer motor
- Low inducer voltage (115VAC)
- Defective pressure switch
- Inadequatecombustion air supply
- Disconnected or obstructed pressure tubing
- Low inlet gas pressure (if LGPS used)
- Restrictedvent
If it opensduring blower on-delay period, blower will come onfor the selected blower off-delay.
4
LIMIT CIRCUIT FAULT.
Indicates a limit, draft safeguard,flame rollout, or blocked vent switch
(if used) is open. Blower willrun for 4 minutesor until open switchremakes whichever is longer.
If open longer than 3 minutes, code changesto lockout #7, Ifopen lessthan 3 minutesstatus
code#4 continues to flash until blower shuts off. Flame rolloutswitch and BVSS require
manual reset. Check for: - Restricted vent - Propervent sizing - Loose blowerwheel
- Excessivewind - Dirty filter or restricted duct system - Defective blower motor or capacitor
- Defectiveswitch or connections
- Inadequate combustionairsupply (Flame Roll.out Switchopen)
5 ABNORMAL FLAME-PROVINGSIGNAL - Flame is proved while gas valve is de-energized.
Inducerwill run until fault is cleared, Check for:
- Leaky gas valve
. Stuck.open gas valve
6 IGNITION PROVINGFAILURE - Controlwill trythree more times before lockout #6+1 occurs,
If flame signal lost during blower on-delay period, blower will come on for the selected blower off-delay.
Check for: - Flamesensor must not be grounded
6
Continued
- Oxide buildup onflame sensor (cleanwith fine steel wool).
- Proper flame sense microamps (.5 microamps D,C. rain., 4,0 - 6.0 nominal),
- Gas valve defective or gas valveturned off
- Manual valve shut-off - Low inlet gas pressure
- Defective Hot Surface Igniter - Control groundcontinuity - Inadequateflame carryover or rough ignition
- Green/Yellowwire MUST beconnected 1ofurnacesheet metal.
7
LIMIT CIRCUIT LOCKOUT - Lockoutoccurs 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. - Refer to #4.
8
GAS HEATING LOCKOUT - Control will NOT auto reset. Check for:
- Mis.-wiredgas valve
- Defectivecontrol (valve relay)
10
POLARITY - Line voltage (115VAC)polarity reversed.
- If twinned,refer to twinning kit instructions.
1+2
BLOWERON AFTER POWER UP (115 VAC or 24VAC) - Blower runs for 90 seconds, if unit is powered
upduring a call for heat (R-W closed) or (R-W) opens during bloweron-delay.
during bloweron-delay.
6+1
IGNITION LOCKOUT
- Controlwill auto-resetafter three hours. Refer 10#6.
OFF
SECONDARYVOLTAGE FUSE IS OPEN Check for: - Door switch not closed
-115VAC at L1 and Neutral,24VAC at 24VAC RED and COM BLUE, 24V Fuse 3A
- Door switch not closed
- Short circuit in secondary voltage (24VAC) wiring.
ON
CONTROLCIRCUITRY LOCKOUT Auto-reset after one hour lockoutdue to;
SOLID - Gas valve relaystuck open
- Flamesense circuit failure
- Softwarecheck error
Reset powerto clear lockout. Replace control if status code repeats.
COMPONENT
TEST
SEQUENCE
Gas valve and humidifierwill not beturned on. Components will be tested in sequenceas follows: Inducermotor will run for entirecomponent test, and the following
components are ON for 10- 15 secondseach individually; hot surface igniter, FAN (if equipped), HEAT speed, COOL speed.
IIIIIIIIIIIIIIMIIIIIIIII
IIIIII
337016-101REV.A
38
441 01 1402 02
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