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Bryant 333B-AV-036060-AA-JA, Troubleshooting Manual

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Bryant 333B-AV-036060-AA-JA Troubleshooting Manual Download Page 29

Appendix A

Board Layout and Schematics

1

2

3

4

5

6

7

8

9

PR2

L2

COM

PR1

L1

EAC-2

EAC-1

H

I-

COO

L

HI-GAS

-HEAT

LO-GAS

-HEAT

PARK

3

FU1

SEC-1

SEC-2

1

1

2

3

4

5

6

7

8

9

10

11

12

MASTER  SLAVE

TWIN

TEST

LED

G

R

Y/Y2

W/W1

C

OM

24 V

W2

1

HUM

1234

3-AMP
FUSE

PL2

HOT SURFACE IGNITOR

INDUCED DRAFT

MOTOR

CIRCUIT CONNECTOR

LINE VOLTAGE

CONNECTIONS

EAC-TERMINALS
115-VAC
1 AMP MAX.

PARK-ISOLATED TERMINAL
FOR THE UNUSED PSC
MOTOR WIRE
BLOWER MOTOR
CONNECTION

TRANSFORMER 24-V
CONNECTORS

PL1
GAS VALVE LOW VOLTAGE SAFETY
CIRCUIT CONNECTOR

TWINNING JUMPER
MASTER/SLAVE

LIGHT-EMITTING DIODE FOR
STATUS CODES

TWINNING BUSS CONNECTOR AND/OR 
STATUS CODE RECALL CONNECTOR

HUM-HUMIDIFIER TERMINAL 
CONNECTION (24-V  0.5 AMP MAX.)

24-V THERMOSTAT
TERMINALS

SETUP SWITCHES
HEAT STAGING AND
BLOWER OFF DELAY

PL4

ICM CONTROL

CONNECTION

A95360

Fig. 2—Control Center

—29—

Summary of Contents for 333B-AV-036060-AA-JA

Page 1: ...HERE section see Index for page number which will guide you to the appropriate section where a minimal number of steps will be used to correct the problem If you are very experienced at how this furn...

Page 2: ...g Btu Input 040 40 000 060 60 000 065 65 000 080 80 000 085 85 000 100 100 000 105 105 000 120 120 000 125 125 000 331AAV 80 Efficient Downflow and Horizontal 2 Stage PSC Motor Low NOx California Unit...

Page 3: ...face ignitor HSI and gas valve GV I ADAPTIVE HEATING MODE SINGLE STAGE THERMOSTAT WITH 2 STAGE HEATING NOTE With high heat only switch SW 1 in OFF position low heat only switch SW 2 selects either low...

Page 4: ...e furnace control CPU is factory set for a 135 sec blower off delay II NON ADAPTIVE HEATING MODE TWO STAGE THERMOSTAT WITH 2 STAGE HEATING NOTE The low heat only switch SW 2 in ON position selects low...

Page 5: ...s an additional 2 sec at high cooling airflow before reverting back to con tinuous blower airflow 7 When R G circuit is opened blower motor BLWM contin ues operating for an additional 90 sec if no oth...

Page 6: ...quence occurs as described above for gas heating After flame is proved and without a blower on delay blower motor BLWM then operates at high gas heat airflow during defrost For both single speed and 2...

Page 7: ...LIMIT DOWNFLOW ONLY SWITCH DID NOT CLOSE OR REOPENED Check for Proper vent sizing and condensate pitch with side wall vent Low inducer voltage 115v Blower motor and capacitor Defective inducer motor...

Page 8: ...ac or 24 vac is interrupted 9 10 9 Go to page number indicated in Index for section covering the first previous sta tus code INDEX 10 Does problem appear to be low cooling airflow 11 12 11 Go to page...

Page 9: ...17 Check 115 vac power lead connections at 2 stage furnace control of each fur nace The BLACK lead goes to L1 and the WHITE lead goes to L2 18 18 Check 115 vac transformer lead connections at 2 stage...

Page 10: ...control and capacitor 28 28 Do you have continuity between the following motor leads RED to WHITE YELLOW to WHITE BROWN to BROWN BLUE to WHITE BLACK to WHITE BROWN to WHITE 29 30 29 Replace capacitor...

Page 11: ...r switch Use a piece of tape to hold switch closed 3 3 Set thermostat to call for heat or jumper R and W W1 thermostat terminals 4 4 When furnace is running in low heat clock low heat gas rate You hav...

Page 12: ...9 Go to page number indicated in Index for CLEANUP AND START UP IN STRUCTIONS INDEX 10 Disconnect R thermostat lead 11 11 Do you have less than 19 vac across R and COM 24V on 2 stage furnace con trol...

Page 13: ...e 115 vac across BLACK and WHITE power leads at blower motor 16 15 15 You have an open wire or bad terminal on either the BLACK or WHITE wire between 2 stage furnace control and blower motor or the po...

Page 14: ...VE FLAME IN 4 ATTEMPTS THE 2 STAGE FURNACE CONTROL WILL AUTO RESET IN 3 HR REFER TO STATUS CODE 34 Status Code 21 GAS HEATING LOCKOUT THIS STATUS CODE INDICATES MAIN GAS VALVE RELAY MGVR ON 2 STAGE FU...

Page 15: ...ICATES LOW HEAT PRESSURE SWITCH LPS IS MADE WHEN A CALL FOR HEAT IS INITIATED THE 2 STAGE FURNACE CONTROL WILL FLASH STATUS CODE 23 UNTIL SWITCH OPENS THEN CYCLE BEGINS STEP ACTION YES NO GO TO 1 Turn...

Page 16: ...tinuity between GRAY wire connected to high heat pressure switch HPS and chassis ground 18 3 18 Disconnect PL2 from 2 stage furnace control 19 19 Do you have continuity between PL2 2 and PL1 10 on 2 s...

Page 17: ...tat terminals 56 56 Jumper loose end of WHITE wire that is normally connected to HUM quick connect terminal on 2 stage furnace control to R thermostat terminal 57 57 Does status code 24 flash 58 65 58...

Page 18: ...eeding to next step 5 5 Does status code 31 flash 9 6 6 Does a different status code flash 7 34 7 Go to page number indicated in Index for section covering the status code INDEX 8 Go to page number in...

Page 19: ...20 minutes or until status code starts flashing 35 35 Does status code 31 flash 37 36 36 Does a different status code flash 7 8 37 Turn power off and disconnect jumper wire across R W W1 and W2 therm...

Page 20: ...E On furnaces with variable speed ICM blower motors blower will turn on and operate at continuous fan speed if low heat pressure switch LPS opens during blower on delay period STEP ACTION YES NO GO TO...

Page 21: ...ide of slope manometer with a tee to collector box pressure tap Refer to Pressure Check Diagram in Appendix C 30 30 Turn power on Jumper R and W W1 thermostat terminals 31 31 Do you have enough pressu...

Page 22: ...e monitor continuity across GRAY wire on high heat pressure switch HPS and ORANGE wire on low heat pressure switch LPS 59 59 Have you had continuity across ALS1 2 since jumper wire across R W W1 and W...

Page 23: ...2 If not replace 2 stage furnace control 32 PL9 2 WHITE to PL9 3 BLACK 24 vac If voltages are correct go to Step 33 If not repair or replace ICM blower harness STEP ACTION YES NO GO TO 33 Make sure bl...

Page 24: ...ON YES NO GO TO 63 Did blower motor change speed when R and W2 were jumpered 38 35 and designate Volt Ohm Meter Leads Status Code 34 IGNITION PROVING FAULT THIS STATUS CODE INDICATES FLAME WAS NOT SEN...

Page 25: ...ter in series with flame sensor wire 29 29 Turn power on Jumper R and W W1 thermostat terminals 30 30 Is DC current below 0 5 microamps 32 31 31 Check connections and retry If current is near typical...

Page 26: ...switch HPS makes and low heat pressure switch LPS is still open 2 stage furnace control starts flashing status code 43 If low heat pressure switch LPS eventually closes 2 stage furnace control stops f...

Page 27: ...us code 43 flash 34 30 30 Does a different status code flash 7 31 31 Remove blower door disconnect jumper wire across R and W W1 thermostat terminals put blower door in place wait for blower to stop a...

Page 28: ...ator setting gas input rates and temperature rises These proce dures are outlined in Installation Start Up and Operating Instructions 3 Check operation of safety devices draft safeguard switch limit s...

Page 29: ...LTAGE CONNECTIONS EAC TERMINALS 115 VAC 1 AMP MAX PARK ISOLATED TERMINAL FOR THE UNUSED PSC MOTOR WIRE BLOWER MOTOR CONNECTION TRANSFORMER 24 V CONNECTORS PL1 GAS VALVE LOW VOLTAGE SAFETY CIRCUIT CONN...

Page 30: ...timum speed selection 5 Replace only with a 3 AMP fuse 6 Auxiliary limit switches ALS1 2 used on some horizontal and some downflow models 7 This wire must be connected to furnace sheet metal for contr...

Page 31: ...115VAC 24VAC TWIN TEST 1 CIRCUIT TWINNING BUSS CONNECTOR ALSO STATUS CODE RECALL NOTE 17 JUNCTION TERMINAL CONTROL TERMINAL FACTORY POWER WIRING 115VAC FACTORY CONTROL WIRING 24VAC FIELD POWER WIRING...

Page 32: ...order to 3 stator windings The frequency of commutation pulses determines motor speed Setting up desired airflow CFM on an ICM is obtained by selections made on EZ SELECT airflow control See Fig 6 Th...

Page 33: ...e Blue Wire is called the CFM TON jumper It is used to select a slight adjustment to cooling airflow The traditional airflow value is 400 CFM TON The 350 CFM TON setting is for best efficiency with ou...

Page 34: ...ctive de humidification mode can be invoked by connecting a humidistat in series with GREEN wire marked DEHUM connected to the 1 4 in quick connect terminal at G on 2 stage furnace control The humidis...

Page 35: ...HP CMFT for 90 of selected cool size and cool CFM TON airflow CFM settings for heat pump heating operation and 100 of selected cool size and cool CFM TON airflow CFM settings for cooling operation an...

Page 36: ...in wc BLUE LABEL 0 35 in wc 0 20 0 05 in wc RED LABEL 333BAV 0 42 in wc 0 27 0 05 in wc ORANGE LABEL 0 35 in wc 0 20 0 05 in wc LT GREEN LABEL HIGH HEAT PRESSURE SWITCH HPS SETTINGS MODEL NO FACTORY S...

Page 37: ...to 3 8 in wc for high stage gas heat Check for proper orifice size Control will attempt to light burners 4 times approximately 1 minute between attempts Code 34 Voltage is present at the gas valve for...

Page 38: ...NING COIL AIRFLOW SUPPLY STATIC INCLINE MANOMETER RETURN STATIC INCLINE MANOMETER Fig 8 Upflow Total Static Pressure Reading Locations A95364 CONDENSING UNIT GAS FIRED WATER HEATER ELECTRONIC AIR CLEA...

Page 39: ...ts with the assumption that 2000 CFM is being delivered Fig 10 Downflow Total Static Pressure Reading Locations A95365 ELECTRONIC AIR CLEANER CONDENSING UNIT AIRFLOW HUMIDIFIER A C COIL RETURN STATIC...

Page 40: ...of night setback coming on in Low Heat and coming on in High Heat EXAMPLE 1 Furnace ran for 16 minutes in Low Heat and 5 minutes in High Heat during previous call for heat LH 16 HH 5 Calculate 228 X...

Page 41: ...calculated by the following LH run time 5600 HL 122 Unit will initiate the next cycle in Low Heat for a maximum of 16 minutes before initiating High Heat if the call for heat still exists Unit will i...

Page 42: ...0 47 0 05 in wc RED LABEL 333BAV 0 68 in wc 0 54 0 04 in wc ORANGE LABEL 0 58 in wc 0 44 0 04 in wc LT GREEN LABEL FLAME SENSOR MICROAMPERAGE Microamp Range 0 5 to 6 0 microamps Typical Reading 4 0 t...

Page 43: ...ight hand RH furnace is considered the SLAVE Thermostat connections are made only to MASTER unit SEQUENCE OF OPERATION See Fig 11 and 12 for 2 speed PSC furnace twinning connection and schematic wirin...

Page 44: ...T N O LOW HEAT PRESSURE SWITCH SPST N O ALS M ALS S BLWM CAP CPU DSS EAC 1 EAC 2 FRS1 FRS2 FSE FU1 FU2 GV HPS HPSR HSI HUM IDM ILK 1 ILK JB LED LGPS LPS LEGEND COMPONENT TEST To initiate the component...

Page 45: ...FIELD CONTROL WIRING 24VAC FIELD ACCESSORY WIRING 24 VAC CONDUCTOR ON CONTROL FIELD WIRING SCREW TERMINAL FIELD GROUND EQUIPMENT GROUND FIELD SPLICE PLUG RECEPTACLE TJ TKR TRAN TWIN TEST LEGEND COMPON...

Page 46: ...using popular video based formats and materials All include video and or slides plus companion book Classroom Service Training plus hands on the products in our labs can mean increased confidence that...

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