Care And Maintenance - Bryant 312AAV/JAV Installation, Start-Up, Operating And Service And Maintenance Instructions

If status code recall is needed, briefly remove then reconnect one main limit wire to display last stored status code. On RED LED boards do not remove power or blower door before initiating status code recall.
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) -Blower runs for the
selected blower off-delay time, if unit is powered up during a call for heat
(R-W/W1 closed) or (R-W/W1) opens during blower on-delay.
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.
- 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:
- Leaky gas valve
23 PRESSURE SWITCH DID NOT OPEN Check for: - Obstructed pressure tubing
24 SECONDARY VOLTAGE FUSE IS OPEN Check for:
voltage (24VAC) wiring.
31 HIGH-HEAT PRESSURE SWITCH OR RELAY DID NOT CLOSE OR REOPENED
Control relay may be defective, refer to status code #32
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 last status code and then turn ON the inducer motor. The inducer
motor will start in HIGH speed and remain on HIGH speed until the end of the test then
shift to LOW speed for 7 to 15 seconds. The hot surface igniter, blower motor LO HEAT
speed, blower motor HI 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. When the blower is
turned OFF the inducer will be switched to low-speed for 10 seconds.
Step 2 — Care and Maintenance
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Never store anything on, near, or in contact with the
furnace, such as:
1. Spray or aerosol cans, rags, brooms, dust mops,
vacuum cleaners, or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaning
compounds, plastic or plastic containers, gasoline,
kerosene, cigarette lighter fluid, dry cleaning fluids,
or other volatile fluids.
3. Paint thinners and other painting compounds, paper
bags, or other paper products. Exposure to these
materials could lead to corrosion of the heat
exchanger.
For continuing high performance and to minimize possible
furnace failure, periodic maintenance must be performed on this
furnace. Consult your local dealer about proper frequency of
maintenance and the availability of a maintenance contract.
WARNING
!
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
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
disconnect switch. Lockout and tag switch with a suitable
warning label.
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.
- Refer to #33.
- Defective control (valve relay)
- Stuck-open gas valve
- Pressure switch stuck closed
- Short circuit in secondary
Fig. 51 - - Service Label
SERVICE
STATUS
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 - Defective pressure switch
- Inadequate combustion air supply
- Disconnected or obstructed pressure tubing
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.
- Defective blower motor or capacitor
- 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
- Gas valve defective or gas valve turned off
- Inadequate flame carryover or rough ignition
- Flame sensor must not be grounded
- Green/Yellow wire MUST be connected to furnace sheet metal
43 LOW-HEAT PRESSURE SWITCH OPEN WHILE HIGH-HEAT PRESSURE SWITCH IS
CLOSED - Check for:
- Mis-wired pressure switches
- Low inlet gas pressure (if LGPS used)
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.
WARNING
!
CARBON MONOXIDE POISONING AND FIRE
HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Never operate unit without a filter or with filter access door
removed.
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts and servicing furnaces.
The minimum maintenance on this furnace is as follows:
1. Check and clean air filter each month or more frequently if
required. Replace if torn.
2. Check blower motor and wheel for cleanliness each heat-
ing and cooling season. Clean as necessary.
3. Check electrical connections for tightness and controls for
proper operation each heating season. Service as neces-
sary.
4. Inspect burner compartment before each heating season
for rust, corrosion, soot or excessive dust. If necessary,
have furnace and burner serviced by a qualified service
agency.
5. Inspect the vent pipe/vent system before each heating sea-
son for rust, corrosion, water leakage, sagging pipes or
broken fittings. Have vent pipes/vent system serviced by a
qualified service agency.
6. Inspect any accessories attached to the furnace such as a
humidifier or electronic air cleaner. Perform any service or
maintenance to the accessories as recommended in the ac-
cessory instructions.
45
- Defective inducer motor
- Low inducer voltage (115 VAC)
- Low inlet gas pressure (if LGPS used)
Check for: - Dirty filter or restricted duct system
- Proper vent sizing - Restricted vent
- Loose blower wheel - Excessive wind
- Control ground continuity
- Low inlet gas pressure
- Defective Hot Surface Ignitor
- Disconnected or obstructed pressure tubing
- Low-heat pressure switch stuck open
- Software check error
327598-101 REV. C
CAUTION
A04210