Installation guide

If status code recall is needed, briefly remove then reconnect one main limit _re to display stored status code. On RED LED boards do not remove power or blower door before initiating status cede recall. After
status code recat[ is completed component test _[[ cocor. LED CODE STATUS
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 vottage (115VAC) polarity reversed, If twinned, refer to twinning kit instructions,
EACH OF THE FOLLOWING STATUS CODES IS A ]WO DIGIT NUMBER WITH THE FI RST DIGIT DETERMI NED 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 31 PRESSURE SWITCH DID NOT CLOSE OR REOPENED - If open longer than five minutes
RED LED boards stored status codes can also be erased when power inducer shuts off for 15 minutes before retry, Check for: - Excessive wind
(115 VAC or 24 VAC) to ceetret is ieterrupted. - Proper vent sizing - Defective inducer motor
12 BLOWER ON AFTER POWER UP (115 VAC or 24 VAC) -Btewer runs for 90 seconds, - Low inducer vettage (115VAC) - Defective pressure switch
if unit is powered up during a call for heat (R-W ctosed) or R-W opens during blower - Inadequate combustion air supply - Disconnected or obstructed pressure tubing
on-delay. - Low inlet gas pressure (if LGPS used) - Restricted vent
13 LIMIT CIRCUIT LOCKOUT - Lockotrl occurs if the timit, draft safeguard, flame rottout, or If it opens during btower on-detay period, btower will come on for the seIected btower
blocked vent switch (if used) is open longer than 3 minutes, off-delay.
- Control wiii auto reset after three hours. - Refer to #33. 33 LIMIT CIRCUIT FAULT - Indicates a timit, draft safeguard, flame roHout, or blocked vent
14 IGNITION LOCKOUT - Control wilt aLrie-reset after three hours, Refer to #34. switch (if used) is open, Blower wilt run for 4 minutes or until open switch remakes
21 GAS HEATING LOCKOUT - Control wilt NOT auto reset, whichever is longer, If open toeger than 3 minutes, code changes to lockout #13.
Check for: - Mis-wired gas valve -Defective control (valve reIay) If open tess than 3 mieutes status code #33 continues to flash untiI blower shuts Off.
22 ABNORMAL FLAME-PROVING SIGNAL - Flame is proved while gas valve is de- Ftame reHeut switch and BVSS require manual reset, Check for: - Restricted vent
energized. Inducer wiii run until fault is cleared. Check for: - Leaky gas valve - Proper vent sizing - Loose blower wheel. - Excessive wind
- Stuck-open gas valve - Dirty filter or restricted duct system.
23 PRESSURE SWITCH DID NOT OPEN Check for: - Defective blower motor or capacitor. - Defective switch or connections.
- Obstructed pressure tubing, - Pressure switch stuck closed, - Inadequate combustion air supply (Flame Roll-out Switch open),
24 SECONDARY VOLTAGE FUSE IS OPEN Check for: 34 IGNITION PROVING FAILURE - Control wilt try three more times before lockout #14
- Short circuit in secondary voltage (24VAC) wiring, occurs, If flame signal test during blower on-delay period, blower wilt come on for the
selected blower eff-dalay. Check for: - Ftame sensor must net be grounded
- Oxide buildup oe flame sensor (clean with fine steel wool).
- Proper flame sense microamps (.5 microamps D.C. mie., 4.0 - 6.0 nominal).
- Gas valve defective or gas valve turned off - Manual valve shut-off
- Defective Hot Surface Ignitor - Control ground continuity
- Low intet 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 - Ftame sense circuit faiIure - Software check error
Reset power to clear lockout, Replace control if status code repeats.
COMPONENT TEST
To initiate the component test sequence, shut OFF the room thermostat or disconnect the "R" I
I
thermostat lead. Briefly short the TEST/TWIN terminal to the "Corn 24V" terminal. Status LED
wiii flash code and then turn ON the inducer motor. The inducer motor wilt rue for the entire I
component test. The hot surface ignitor, blower motor fan speed (oe AMBER LED boards
only) Newer motor-heat speed, and blower motor-coot speed wilt be turned ON for 10-15 I
seconds each. Gas Valve and Humidifier wilt not be turned on.
_ 327596-101 REV. B
A04223
Fig. 45 - Service Label
SERVICE AND MAINTENANCE
PROCEDURES
FIRE, EXPLOSION, ELECTRICAL SHOCK
HAZARD
Failure to follow this warning could result in personal
iniury, 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.
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow this warning could result in personal
iniury or death, or property damage.
Before servicing, disconnect all electrical power and install
lockout tag to furnace. Verify proper operation after
servicing.
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.
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
pollution.
Remove and recycle all components or materials (i.e. oil,
refrigerant, et.) before unit final disposal.
Step 1 reintroduction
GENERAL
These instructions are written as if the furnace is installed in an
upflow application. An upflow furnace application is where the
blower is located below the combustion and controls section of
the furnace, and conditioned air is discharged upward. Since this
furnace can be installed in any of the 4 positions shown in Fig. 4,
you must revise your orientation to component location
accordingly.
ELECTRICAL CONTROLS AND WIRING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
iniury or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position and
install a lockout tag. There may be more than one electrical
supply to the furnace. Check accessories and cooling unit
for additional electrical supplies that must be shut off during
furnace servicing. Lockout and tag switch with a suitable
warning label. Verify proper operation after servicing.
The electrical ground and polarity for 115-v wiring must be
properly maintained. Refer to Fig. 26 for field wiring information
and to Fig. 41 for furnace wiring information.
NOTE: If the polarity is not correct, the STATUS LED on the
control will flash rapidly and prevent the furnace from heating.
43