Bryant 315AAV Furnace Setup Switch Description, Service Label, Adjustments, Fire Hazard

315AAV

Table 10 – Furnace Setup Switch Description

SETUP SWITCH	SWITCH NAME	NORMAL	DESCRIPTION OF USE
NO.		POSITION
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.
			Allows 2--- stage operation with a single stage thermostat. Turn ON when
SW1--- 2	Adaptive Heat Mode	OFF	using 2 stage thermostat to allow 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-	ON	Turn ON to decrease Low Heat airflow by 16 percent and High Heat
	justment		airflow 10 percent for maximum comfort.
SW1--- 5	CFM per ton adjust	OFF	Turn ON for 400 CFM per ton. Turn OFF for 350 CFM per ton.
			Turn ON to initiate Component Self--- Test for troubleshooting assistance
SW1--- 6	Component Self--- Test	OFF	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.

		SERVICE
LED CODE	STATUS	If status code recall is needed disconnect the "R" thermostat lead, reset power, and put setup switch "SW1-1" in the ON
CONTINUOUS OFF - Check for 115VAC at L1 and L2, and 24VAC at SEC-1 and SEC-2.		position. To clear the status code history put setup switch "SW1-1" in the ON position and jumper thermostat terminals "R",
CONTINUOUS ON - Control has 24VAC power.		"W/W1", and "Y/Y2" simultaneously until status code #11 is flashed.

RAPID FLASHING - Line voltage (115VAC) polarity reversed.

EACH OF THE FOLLOWING STATUS CODES ISA 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 codes are erased automatically after 72

32 Continued: Check for:

- Low inducer voltage (115 VAC)

COMPONENT TEST

12

hours or as specified above.

-Blower runs for 90

- Defective inducer motor

- Inadequate combustion air supply

BLOWER ON AFTER POWER UP (115 VAC or 24 VAC)

- Defective pressure switch

- Low inlet gas pressure (if LGPS used)

To initiate the component test sequence, shut

seconds, if unit is powered up during a call for heat (R-W/W1 closed) or

- Low inducer voltage (115 VAC)

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(R-W/W1 opens) during blower on-delay period.

- Disconnected or obstructed pressure tubing

OFF the room thermostat or disconnect the "R"

LIMIT CIRCUIT LOCKOUT - Lockout occurs if a limit, draft safeguard, flame

33 LIMIT CIRCUIT FAULT - Indicates a limit, draft safeguard, flame rollout, or

thermostat lead. Reset power and then put setup

rollout, or blocked vent switch (if used) is open longer than 3 minutes or 10

blocked vent switch (if used) is open or the furnace is operating in high-heat

switch "SW1-6" in the ON position to start the

successive limit trips occurred during high-heat. Control will auto reset after

only mode due to 2 successive low heat limit trips. Blower will run for 4

component test sequence. Once initiated the

three hours. Refer to status code #33.

minutes or until open switch remakes whichever is longer. If open longer

furnace control will turn the inducer ON at high-

14

IGNITION LOCKOUT - Control will auto-reset after three hours. Refer to status

than 3 minutes, code changes to lockout #13. If open less than 3 minutes

heat speed. The inducer motor will run for the

15

code #34.

BLOWER MOTOR LOCKOUT - Indicates the blower failed to reach 250 RPM or

status code #33 continues to flash until blower shuts off. Flame rollout switch

entire test. The hot surface igniter and blower

the blower failed to communicate within 30 seconds after being turned ON in two

and BVSS require manual reset.

Check for: - Loose blower wheel

motor will be turned ON for 15 seconds each.

successive heating cycles. Control will auto reset after 3 hours.

- Restricted vent

- Proper vent sizing - Excessive wind

When the blower is turned OFF the inducer will

21

Refer to status code #41.

- Dirty filter or restricted duct system

- Defective switch or connections

be switched to low-speed for 10 seconds. When

GAS HEATING LOCKOUT - Control will NOT auto reset. Check for:

- Inadequate combustion air supply (Flame Roll-out Switch open)

the component test is completed one or more of

- Mis-wired gas valve

-Defective control (valve relay)

34 IGNITION PROVING FAILURE - Control will try three more times before

22

the following codes will flash.

ABNORMAL FLAME-PROVING SIGNAL - Flame is proved while gas valve is

lockout #14 occurs. If flame signal lost during blower on-delay period, blower

de-energized. Inducer will run until fault is cleared. Check for:

will come on for the selected blower off-delay. Check for:

CODE

DESCRIPTION

23

- Leaky gas valve

- Stuck-open gas valve

- Oxide buildup on flame sensor (clean with fine steel wool)

PRESSURE SWITCH DID NOT OPEN Check for:

- Proper flame sense microamps (.5 microamps D.C. min., 4.0 - 6.0 nominal)

11 Indicates the blower motor tested

- Obstructed pressure tubing

- Pressure switch stuck closed

- Manual valve shut-off

- Low inlet gas pressure - Control ground continuity

24

SECONDARY VOLTAGE FUSE IS OPEN Check for: - Short circuit in secondary

OK. Visual check of inducer motor

- Gas valve defective or turned off

- Flame sensor must not be grounded

voltage (24VAC) wiring.

and hot surface igniter required.

- Inadequate flame carryover or rough ignition

25

INVAL ID MODEL SELECTION OR SETUP ERROR - Indicates either the model

25 SETUP ERROR - Same as code 25 above.

- Green/Yellow wire MUST be connected to furnace sheet metal

plug is missing or incorrect or, setup switch "SW1-1" or "SW1-6" is positioned

41 BLOWER MOTOR FAULT - Indicates the blower failed to reach 250 RPM

41 BLOWER MOTOR FAULT - Indicates

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

or the blower failed to communicate within the prescribed times limits. Thirty

blower motor failed test. Check

both SW1-1 & SW1-6 ON. - Board date code 2103 or later required to recognize model

43

seconds after being turned ON or ten seconds during steady-state operation.

blower, wiring, and furnace control.

31

plug 007. - Proper model plug number and resistance values per wiring diagram

LOW-HEAT PRESSURE SWITCH OPEN WHILE HIGH-HEAT PRESSURE

To repeat component test turn setup switch

HIGH-HEAT PRESSURE SWITCH OR RELAY DID NOT CLOSE OR

SWITCH IS CLOSED - Check for:

- Mis-wired pressure switches

32

REOPENED - Control relay may be defective. Refer to status code #32.

- Low-heat pressure switch stuck open

- Low inlet gas pressure (if LGPS used)

"SW1-6" OFF and then back ON. After component

LOW-HEAT PRESSURE SWITCH DID NOT CLOSE OR REOPENED - If open

45

- Disconnected or obstructed pressure tubing

test is completed put setup switch "SW1-6" in the

longer than five minutes, inducer shuts off for 15 minutes before retry. If opens

CONTROL CIRCUITRY

LOCKOUT

Auto-reset after one hour lockout due to;

OFF position and reconnect the "R" thermostat

during blower on-delay period, blower will come on for the selected blower

- Gas valve relay stuck open - Flame sense circuit failure - Software check error

lead.

328787-101 REV. A

off-delay. Check for: - Excessive wind - Restricted vent

- Proper vent sizing

Reset power to clear lockout. Replace control if status code repeats.

A04015

Fig. 52 - Service Label

Adjustments

!WARNING

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.

!CAUTION

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.)

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.

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