Bryant SM03-4 Service Manual Download Page 13 | Manualshive

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Fig.

9—Two-Speed

Fan

Relay

Kit

A97028

W3

W2

E

G

C

CB

2-05868-2A

TWO SPEED FAN

RELAY WIRING

LOW VOLTAGE BOARD

L

FR

CB

FAN RELAY

CIRCUIT BOARD

MARKED TERMINAL

UNMARKED TERMINAL

FIELD CTRL WIRING

FACTORY POWER WIRING

FIELD POWER WIRING

AUX

1

AUX

2

F4

24 VDC

ORG

RED

FR

LOW MTR SPD

HI MTR SPD

FAN COMMON

UNUSED LEAD

BLK

208/240 VAC

COM

NO

NC

F3

F2

L2

F1

O

Y

R

TRANSFORMER

AC

LINE

T1

T2

COMMON

COMMON

DUMMY

T3

L2

L1

F1

F2

F3

F4

2SD-1

C

AUX1

AUX2

VAC

EAC2

FAN

EAC1

L

O

Y

R

C

G

E

W2

W3

AUX 1

AUX 2

ORG

RED

BLK

YEL

NO TO

HIGHER

FAN SPEED

LOW-VOLTAGE

COIL TERMINALS

NC TO

LOWER

FAN SPEED

DUMMY TERMINALS FOR

UNUSED FAN MOTOR

SPEED-TAP

LEADS

FAN MOTOR

COMMON LEAD

—13—

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Summary of Contents for SM03-4

Page 1: ...Troubleshooting PCB 32 Troubleshooting ICM2 34 Condensed Version of Troubleshooting FK4C FV4A Motor and Controls 34 Accessories 34 THERMOSTATIC EXPANSION VALVES TXV 35 Problems Affecting TXV 36 PISTO...

Page 2: ...3A 1 The low voltage stripped leads are used to connect the 24 v side of transformer to indoor thermostat and outdoor section 2 A 5 amp fuse is used to protect the low voltage transformer secondary 3...

Page 3: ...w 2 Downflow 3 Horizontal 4 Multipoise 5 Upflow Downflow Airflow 018 1 1 2 Ton 024 2 Ton 001 Multi Tons 002 Multi Tons Etc Cooling Size 10th 11th 12th Positions Fan Coil 005 010 Etc Heating Size KW 6t...

Page 4: ...ultipoise Single Piece FV4ANB 006 Multipose Modular NOTE Multipoise units are approved for upflow downflow and horizontal left and right applications TABLE 2 PSC FAN MOTOR SPEED TAPS MODEL UNIT SIZE N...

Page 5: ...e in troubleshooting PCB unless otherwise noted A If Fan Will Not Turn On from Thermostat IF THERE IS NO HIGH VOLTAGE TO TRANSFORMER 1 Check plug receptacle connection This supplies power from heaters...

Page 6: ...voltage transformer needs to be replaced B If Electric Heat Stages Will Not Turn On But Fan Will Turn On IF THERE IS NO HIGH VOLTAGE TO TRANSFORMER 1 Check plug connection between heaters and board T...

Page 7: ...BLK AND LOW BLU OR RED 12 CONNECT R TO R G TO G ETC SEE OUTDOOR INSTRUCTION FOR DETAILS 13 IF WIRE CRIMP IS REMOVED AN EMERGENCY HEAT RELAY IS REQUIRED SEE OUTDOOR THERMOSTAT INSTRUCTIONS THIS COMPAR...

Page 8: ...e 5 Use 60 amp class K fuses only for replacement 6 3 speed motor shown Optional 2 speed motor uses HI BLK and LOW BLU or RED 7 Connect R to R Gto G etc see outdoor instruction for details 8 Smaller h...

Page 9: ...listed as follows along with their functional control 1 R is used to connect the secondary side of the transformer The red wire provides low voltage 24v to the PCB and the thermostat R is fused on th...

Page 10: ...fan off delay which begins timing when the Y is de energized 5 O is used as a junction for a heat pump reversing valve circuit Fig 7 HK61GA003 Printed Circuit Board A97026 3 6 9 12 2 5 8 11 1 4 7 10 L...

Page 11: ...be turned on without the fan being turned on at the same time This is a fan interlock system 2 W3 When a signal is sent to W3 2 control signals are sent out to the sequencers a 24 v dc signal to seque...

Page 12: ...FUSE MAX FAN TDB YEL LS 5 HTR5 BLK BLK 10 9 YEL FU5 FU6 SEQ 3 LS 6 HTR6 BLK BLK 12 11 YEL LS 5 HTR5 BLK BLK 6 5 YEL FU3 FU4 SEQ 2 LS 4 HTR4 BLK BLK 8 7 YEL LS 1 HTR1 BLK BLK BLU MED BLU MED RED LO RED...

Page 13: ...G RED FR LOW MTR SPD HI MTR SPD FAN COMMON UNUSED LEAD BLK 208 240 VAC COM NO NC F3 F2 L2 F1 O Y R T R A N S F O R M E R A C L I N E T 1 T 2 C O M M O N C O M M O N D U M M Y T 3 L 2 L 1 F 1 F 2 F 3 F...

Page 14: ...LD POWER WIRING AUX 1 AUX 2 F4 24 VDC RED FR LOW MTR SPD HI MTR SPD FAN COMMON UNUSED LEAD BLK 208 240 VAC NO C HST ORG ORG COM NO NC F3 F2 L2 F1 O Y R T R A N S F O R M E R A C L I N E T 1 T 2 C O M...

Page 15: ...WIRING FIELD POWER WIRING AUX 1 AUX 2 F4 24 VDC TDR YEL FAN COMMON UNUSED LEAD UNUSED LEAD BLK 208 240 VAC COM NO NC F3 F2 L2 F1 O Y R T R A N S F O R M E R A C L I N E T 1 T 2 C O M M O N C O M M O...

Page 16: ...NG AUX 1 AUX 2 F4 24 VDC TDR FR ORG ORG RED YEL FAN COMMON UNUSED LEAD LOW MTR SPD HI MTR SPD BLK 208 240 VAC COM NO NC F3 F2 L2 F1 O Y R COM NO NC T R A N S F O R M E R A C L I N E T 1 T 2 C O M M O...

Page 17: ...MAX AUX2 L1 EAC1 FAN R L G E C O Y W2 INDOOR THERMOSTAT YEL YEL BLK LS 3 HTR3 BLK BLK 6 5 YEL FU1 FU2 FU3 FU4 SEQ 2 LS 4 HTR4 BLK BLK 8 7 YEL LS 1 HTR1 BLK BLK 2 1 YEL SEQ 1 LS 2 HTR2 BLK BLK 4 3 SEQ...

Page 18: ...the PCB transformer and the fan Make sure the plug is connected properly 2 Check sequencer number 1 and the plug wiring The yellow wire should be connected to pin number 9 of the plug and the limit s...

Page 19: ...m temperatures cool sufficiently the switch will automatically reset to its closed position Normal failure mode for this switch is open If a limit switch has been determined to be defective NEVER BYPA...

Page 20: ...w due to dirty filters blocked registers or undersized duct 2 Check blower motor and wheel for proper operation Excessive current draw of motor will cause internal over load to trip 3 The fan speed ma...

Page 21: ...ied together by jumpers JW1 and JW2 These jumpers are provided for field staging of electric heater banks through use of thermostats When staging is a requirement installer cuts jumpers and wires in t...

Page 22: ...ses selected taps to modify its operation to a pre programmed table of airflows Airflows are based on system size or mode of operation and those airflows are modified in response to other inputs such...

Page 23: ...flow supplied for all operational modes except non heat pump heating modes 10 percent and 10 percent respec tively The adjust selection options are provided to adjust airflow supplied to meet individu...

Page 24: ...option 24 vdc 0 187 X 0 032 M1 Common connection to blower motor T1 Common connection for transformer RED Common to R screw terminal and SEC2 TABLE 4 CONNECTIONS ON SINGLE BARRIER STRIP MOUNTED CROSS...

Page 25: ...L RECP 3 RECP 4 ICM BRN YEL RED VIO RED ORN BRN VIO ORN GRY BLU BLK BLK 1 9 2 10 3 11 4 12 5 13 6 14 7 15 8 16 PLUG 2 BLK YEL ORN GRN RED BRN VIO SEE NOTE 3 SEE NOTE 2 HPTB E Y1 Y0 W2 O L R NOTES 1 Us...

Page 26: ...orted or system is trying to draw more VA than transformer rating allows When fuse blows because of high voltage the system has mixed high and low voltage signals 1 Check transformer and thermostat wi...

Page 27: ...it board terminals AUX1 and AUX2 See Fig 16 This signal is present when either G or W is present and is active in all heating and cooling modes Because 24 vdc relays may not be readily available to in...

Page 28: ...2 is fed high voltage AC power through the 5 pin connector See Fig 23 The AC power is then rectified to DC by a diode module After rectification DC signal is electronically communicated and fed in seq...

Page 29: ...se of thermostats When staging is a requirement remove J2 jumper and wire in thermostats as is the common practice with other fan coils To ensure motor operation if any 1 of the inputs is energized mo...

Page 30: ...operation to a pre programmed table of airflows Airflows are based on system size or mode of operation and those airflows are modified in response to other inputs such as the need for de humidificati...

Page 31: ...it installed in all operational modes See Fig 24 C System Type The type of system must be selected 1 AC air conditioner 2 HP COMFORT provides lower airflow than air condi tioner selection approximatel...

Page 32: ...Check low voltage fuse shown in Fig 24 If fuse is blown replace it The transformer cannot supply power to board with fuse blown or loose If fuse blows when unit has power applied to it the system most...

Page 33: ...WHT PLUG 3 230V 208V Com YEL BLK BLK YEL ICM RECP 4 RECP 3 GRY 1 BRN 12 11 10 9 8 7 6 5 4 3 2 1 5 4 3 2 1 G R N Y E L B L K W H T RED VIO V I O R E D B R N O R N BRN PLUG 1 G R Y 16 15 14 13 12 11 10...

Page 34: ...continues to run remove all thermostat wires If motor stops check thermostat wiring to thermostat or outdoor unit for shorts or miswire XV CONDENSED VERSION OF TROUBLESHOOTING FK4C AND FV4A MOTOR AND...

Page 35: ...heat pump systems to adjust to changing load conditions by maintaining a preset superheat temperature at outlet of evaporator coil The volume of refrigerant metered through valve seat is dependent up...

Page 36: ...place seal ring on retainer 8 Reconnect refrigerant tube to piston body 9 Pressurize tubing and coil then leak check 10 Evacuate tubing and coil as necessary CAUTION Use a backup wrench and do not ove...

Page 37: ...id and vapor refrigerant tubes and conden sate drain tube Install new liquid line filter drier 20 Evacuate tube set and indoor coil to 500 microns back seat open liquid and vapor service valves 21 Tur...

Page 38: ...tube from original coil and install it in same position on new coil See Fig 31 12 Place coil assembly in plastic condensate pan and secure using 4 screws through delta plate See Fig 31 13 Horizontal...

Page 39: ...llow filter to dry No oiling or coating of filter is required New filters are available from your local distributor Place filter in slot with cross mesh binding up or facing cooling coil and replace f...

Page 40: ...rmer A 40 VA transformer supplies 24 v power for control circuit Check for 208 230v on primary side of transformer If present check for 24v on secondary side NOTE Transformer is fused Do not short cir...

Page 41: ...LK BLK HTR LS YEL VIO BLK BLK RED BLU TRANS DISCONNECT SEE RATING PLATE FOR VOLTS HZ FIELD POWER SUPPLY CHASSIS GROUND RED VIO ORN BRN BRN CHASSIS GROUND RED ORN T A P2 B BRN BRN 5 6 SEQ CHASSIS GROUN...

Page 42: ...be a trap in condensate line Trap must be at least 3 in deep not higher than the bottom of unit condensate drain opening and pitched downward to an open drain or sump CAUTION Do not use caustic househ...

Page 43: ...SFORMER PIGTAILS BLUE 208V RED 230V INSULATE UNUSED LEAD 2 FAN MOTOR PIGTAILS RED LOW BLACK HIGH INSULATE UNUSED LEAD 3 FAN MOTOR THERMALLY PROTECTED 4 SUITABLE FOR USE WITH COPPER OR COPPER CLAD ALUM...

Page 44: ...ction of this manual C Transformer A 60 VA transformer supplies 24 v power for control circuit Check for 208 230 v on primary side of transformer If present check for 24 v on secondary side Replace tr...

Page 45: ...every 5 years if motor is used on intermittent operation thermostat FAN switch at AUTO position or every 2 years if motor is in continuous operation thermostat FAN switch at ON position Remove motor...

Page 46: ...ump signaling control board that heat pump is in defrost g W2T terminal provides input from thermostat signaling for supplemental or emergency heat h W3 terminal provides input from outdoor thermostat...

Page 47: ...ycle down indoor fan remains on 60 sec to recover heat stored in indoor coil C Defrost The Smart Heat PCB stages the correct amount of supplemental heat during defrost If too much heat is added system...

Page 48: ...gh speed through terminals F1 and HI The LED indicator on control signals 5 flashes indicating cooling operation The call for cooling signals can be confirmed by placing voltmeter leads across low vol...

Page 49: ...s sequencer relay terminal 4 of sequencer relay 1 and terminal 4 of limit switch 3 The reading should be 208 230v and heater should be energized If 208 230v is not observed at terminals specified chec...

Page 50: ...EFERENCE GUIDE FOR INSTALLERS AND TECHNICIANS Puron R 410A refrigerant operates at 50 70 percent higher pressures than R 22 Be sure that servicing equipment and replacement components are designed to...

Page 51: ...AT E W2 O G Y C R LVTB Yo W3 W2T W2D O G Y C R YEL BLK VIO BRN 7 8 9 6 5 4 1 2 3 YEL YEL YEL SEQ 3 HTR3 3 SEQ1 8 7 4 SEQ2 6 5 SEE NOTE 1 SEE NOTES 2 7 AND 8 YEL COM CAP BRN FM BRN GRN YEL GND BLK HI B...

Page 52: ...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 really pays...

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