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Step 10—PCB Layout and Description

NOTE:

Layout of actual PCB is depicted in Fig. 24 and 25.

The PCB interfaces a variable-speed ICM2 with other system
components.

Power for system is supplied from a 230-vac, 60-Hz line. Class 2
voltage (24 vac nom.), used for thermostat connections, is derived
from transformer located in close proximity to PCB. The primary
and secondary of transformer are connected to PCB. The 24-vac
secondary circuit includes 5-amp automotive-type fuse in SEC2
circuit.

Connection to heater panel is made through 12-circuit connector
P1. Connections to thermostat are made at screw terminals.
Twenty-one pin terminals comprise field select taps for motor.

Fuse Data: 5-amp automotive-type ATC/ATO (tan)

32v
200 percent current opening time of 5 sec maximum

ELECTRICAL CONNECTIONS

Twenty-one 0.110-in pin terminals are used to provide program-
ming selections for operating modes of ICM2. The 6 selection
modes are listed below. For additional information, refer to Easy
Select Configuration Taps section.

AUX Heat Range—(Violet Wire)
AC/HP Size—(Blue Wire) Type—(Orange Wire)

AC/HP CFM Adjust—(Black Wire)
AC/HP Time Delay—(Grey Wire)
Continous Fan—(Yellow Wire)

Step 11—Sequence of Operation

CONTINUOUS FAN MODE

The thermostat closes circuit R to G. The G signal is sent directly
to ICM2.

COOLING MODE—SINGLE SPEED OR 2-SPEED HIGH

Thermostat closes circuits R to Y/Y2 and R to O (heat pump only)
for single speed. A circuit from R to Y1 is also required for
2-speed high.

COOLING MODE—TWO-SPEED LOW

Thermostat closes circuits R to Y1 and R to O (heat pump only).
The Y1 & O signals are sent to ICM2.

COOLING MODE—SUPER DEHUMIDIFICATION CALL
FROM THERMIDISTAT

Thermidistat closes circuits R to Y/Y2 and R to O (heat pump
only) for single speed. A circuit from R to Y1 is also required for
2-speed high. Thermidistat call for super dehumidification opens
circuit from R to G. The ICM adjusts airflow down to a lower
CFM for maximum dehumidification for a period of 10 minutes. If
this call continues, outdoor section and ICM shut off for 10

Fig. 23—FK4C, FV4A, and 40FKA ICM2.3 Motor

A98201

1

2

3

4

5

9

1 2 3 4 5 6 7 8

10 11 12 13 14 15 16

POWER CONNECTOR

CONTROL CONNECTOR

OPTIONAL SAFETY GROUND

DRAIN HOLE

DRAIN HOLE

OPTIONAL SAFETY GROUND

ENDSHIELD

DRAIN HOLE

CONTROL

POWER

29

Содержание FA4ANF

Страница 1: ...ing FK4C FV4A 40FKA Motor and Controls 33 Accessories 35 THERMOSTATIC EXPANSION VALVES TXV 36 Problems Affecting TXV 36 PISTON BODY CLEANING OR REPLACEMENT 36 LIQUID TUBE STRAINER 37 FA FB FC FK COIL...

Страница 2: ...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 The...

Страница 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...

Страница 4: ...gether If independent staging is desired consult outdoor ther mostat installation instructions or corporate thermostat instruc tions Step 3 Troubleshooting the Printed Circuit Board Use wiring schemat...

Страница 5: ...itch Black wire should be connected to pin number 7 of plug and to sequencer relay number 1 3 Check incoming high voltage power leads If these are not receiving power system cannot function If Transfo...

Страница 6: ...de DC power for the fan relay and the first stage of electric heat W2 W3 or E Fig 3B FF1D Typical Wiring Diagram A98229 SEE NOTE 7 F 1 NO NC SPT OUTDOOR UNIT G PCB BLK C INDOOR THERMOSTAT BARRIER C T...

Страница 7: ...primary or high side of the transformer The blue wire is connected to T3 for 208 v applications The red wire is connected to T3 for 230 v applications Units are factory wired at 230v The T2 terminal i...

Страница 8: ...EWER ELEMENTS AND COMPONENTS 9 1 PHASE HEATERS ARE SHOWN WIRED FOR SINGLE SUPPLY CIRCUIT 10 USE 60 AMP CLASS K FUSES ONLY FOR REPLACEMENT 11 3 SPEED MOTOR SHOWN OPTIONAL 2 SPEED MOTOR USES HI BLK AND...

Страница 9: ...4 Replace low voltage fuse with no greater than 5 amp fuse 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...

Страница 10: ...Fig 10 shows proper connection for latent capacity control kit Note that it is connected in the same manner as 2 speed fan relay kit but with relay connected to humidistat orange wires c Time delay of...

Страница 11: ...ck sequencer number 1 and the plug s wiring the yellow wire should be connected to pin number 9 of the plug and the limit switch A black wire should be connected to pin number 7 of the plug and to seq...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 18: ...incoming high voltage power leads If these are not receiving power the system cannot function If the PCB has high voltage applied to it 1 Check the low voltage transformer leads R and C Make sure they...

Страница 19: ...ensure that it is replaced with a limit switch of identical opening temperature and closing differential Limits switches are typically color coded to identify their range KFA AND KFB SEQUENCER The seq...

Страница 20: ...ters or undersized duct 2 Check blower motor and wheel for proper operation Exces sive current draw of motor will cause internal overload to trip 3 The fan speed may be low FAN COIL DESCRIPTION AND TR...

Страница 21: ...eed A circuit from R to Y1 is also required for 2 speed high The Y Y2 signal is sent directly to ICM2 COOLING MODE TWO SPEED LOW Thermostat closes circuits R to Y1 and R to O heat pump only The Y1 sig...

Страница 22: ...or erratic motor operation can result TRANSFORMER MOTOR AND ELECTRIC HEATER POWER CONNECTIONS The high voltage 230 vac power input to board is provided through electric heater connector pins 7 and 9...

Страница 23: ...or heat pump size is largest unit meant for application with model of fan coil purchased The installer needs to select air conditioner or heat pump size to ensure that airflow delivered falls within p...

Страница 24: ...UX2 Low voltage output for auxiliary 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 o...

Страница 25: ...Blown Diodes If diodes are blown it is probable that electric heater plug is miswired Correct miswiring NOTE Board will need to be replaced if diode is bad If Traces Are Overheated on Back of PCB Usua...

Страница 26: ...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...

Страница 27: ...g and turn on power Check for 24v between pin 1 and pin 12 on the 16 pin plug See Fig 19 If no voltage is present replace wiring harness If voltage is present jumper screw terminal R Y Y2 on circuit b...

Страница 28: ...uct Data for static pressure limits The ICM2 is pre programmed and contains airflow tables for all modes of operation Blower characteristics requested airflow torque and speed are known from laborator...

Страница 29: ...let Wire AC HP Size Blue Wire Type Orange Wire AC HP CFM Adjust Black Wire AC HP Time Delay Grey Wire Continous Fan Yellow Wire Step 11 Sequence of Operation CONTINUOUS FAN MODE The thermostat closes...

Страница 30: ...R to Y1 is also required for 2 speed high Y Y2 and Y1 signal is sent to ICM2 Thermidistat call for Comfort Heat will occur between 10 and 40 F outdoors and opens circuit from R to G ICM adjusts airfl...

Страница 31: ...rness to motor The C side of low voltage control power circuit is connected by printed circuit runs to motor connector pins 9 10 and 11 then through motor control harness to motor LOW VOLTAGE CIRCUIT...

Страница 32: ...urchased The installer needs to select air conditioner or heat pump size to ensure that airflow delivered falls within proper range for size of unit installed in all operational modes See Fig 24 SYSTE...

Страница 33: ...When there is a high current drawn on transformer it is most likely because transformer has been shorted or system is trying to draw more va than transformer rating allows When fuse blows because of h...

Страница 34: ...BLK 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...

Страница 35: ...air cleaner when G or W are present See Fig 28 FK4C FV4A AND 40FKA DE HUMIDIFY MODE NOTE Humidistat must open on humidity rise Latent capacities for systems using the FK4C FV4A and 40FKA fan coils ar...

Страница 36: ...m with which the pin carrier spring pressure closes valve The refrigerant flow is effectively stabilized to load demand with negligible change in superheat The bi flow TXV is used on split system heat...

Страница 37: ...ndensate drain pan Remove fitting panel 7 Remove any shipping clips including horizontal pan clip and slide coil condensate pan assembly out of unit 8 Upflow or Horizontal Applications Only Remove hor...

Страница 38: ...nditioners and Heat Pumps Service Manual for further information FX4A AND FV4A COIL CONDENSATE PAN REMOVAL AND REPLACEMENT PURON REFRIGERANT Step 1 A Coil Units If it is determined that system does no...

Страница 39: ...12 Remove coil top seal See Fig 32 13 Install new coil into condensate pan using 2 original screws and 2 support columns NOTE Correct coil position in condensate pan is essential to reliable operatio...

Страница 40: ...bolts Make sure mount or motor is grounded to blower housing 4 Locate blower wheel setscrew over flat on motor shaft Rotate wheel in housing It should not rub housing and should be centered in inlet o...

Страница 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...

Страница 42: ...hanical equipment personal injury can result from sharp metal edges Be careful when removing parts AIR FILTER To clean or replace air filter grasp it at bottom and lift it out of unit Clean filter usi...

Страница 43: ...n lead is yellow NOTE Unused fan speed leads must be tapped off to prevent direct short to cabinet surface The motor is turned on through 2 different routes The first occurs when thermostat calls for...

Страница 44: ...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...

Страница 45: ...edges Be careful when removing parts The minimum maintenance requirements for this equipment are as follows 1 Inspect and clean or replace field supplied air filter each month or as required 2 Inspec...

Страница 46: ...can result from sharp metal edges Be careful when removing parts RETURN AIR FILTER To clean or replace air filter remove screws and filter access door Slide out filter For washable type filters clean...

Страница 47: ...ally connected to equip ment ground Step 2 Unit Functions TRANSFORMER NOTE Terminals T1 T2 if used and T3 are wired to primary or high side of transformer The 208 v terminal or blue wire if transforme...

Страница 48: ...elements For troubleshooting a service LED indicates condition of PCB See Table 11 for LED flash codes Step 4 Electrical Operating Sequences and Troubleshooting NOTE Refer to Table 12 for proper inpu...

Страница 49: ...ergized control energizes fan motor It may run on high or low speed depending on its operation in previous cycle Compressor operation in current cycle is monitored by the smart control to determine wh...

Страница 50: ...ircuit of sequencer relay place voltmeter leads across 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...

Страница 51: ...uld be designed to detect HFC refrigerant Puron R 410A as other HFC s is only compatible with POE oils Vacuum pumps will not remove moisture from oil Do not use liquid line filter driers with rated wo...

Страница 52: ...YEL COM CAP BRN FM BRN GRN YEL GND BLK HI BLU MED BRN RED TRAN MOTOR SPEED AT 20 KW FAN COIL SIZE MINIMUM MOTOR LO SPEED TAP SELECTION NOTES LS2 LS1 RED SEQ3 SEQ2 SEQ 2 9 10 BLK 7 LS2 YEL 8 BLK HTR2...

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