Carrier 38TDB instruction manual Accessory Usage, A01222, † Required for all applications

LEGEND

24 VOLT FACTORY WIRING

24 VOLT FIELD WIRING

FIELD SPLICE CONNECTION

RELAY SPDT, PILOT DUTY 24-V COIL (HN61KK324)

OR EQUIVALENT

R1

H

AFS

HUMIDISTAT, OPENS ON HUMIDITY RISE (HL38MG026)

AIRFLOW SELECTOR

A01222

WIRING DIAGRAM NOTES:

1.WIRING MUST CONFORM TO NEC OR LOCAL CODES.

2.UNDERLINED LETTER ON THERMOSTAT TERMINAL INDICATES USAGE. FOR EXAMPLE: O/W2 MEANS O IS ENERGIZED IN COOLING MODE.

3.REFER TO INDOOR UNIT INSTALLATION INSTRUCTIONS FOR ANY ADDITIONAL FEATURES AND WIRING INFORMA- TION.

4.NON-PROGRAMMABLE MODEL 2S01–B, WHEN USED IN AIR CONDITIONING INSTALLATION THE R19 JUMPER MUST BE CUT AND REMOVED.

5.PROGRAMMABLE MODEL 2S01–B MUST HAVE DIP SWITCH C ON WHEN USED IN AIR CONDITIONER APPLICATIONS.

6.THERMIDISTAT DIP SWITCH NO. 1 SHOULD BE SET IN OFF POSITION FOR AIR CONDITIONER APPLICATIONS (FACTORY DEFAULT).

7.AS AN OPTION O/W2CAN CONTROL SECOND-STAGE HEAT.

8.THERMIDISTAT DIP SWITCH NO. 2 SHOULD BE SET IN THE ON POSITION FOR DUAL CAPACITY COMPRESSOR OPERATION.

9.TO ACTIVATE DEHUMIDIFY FUNCTION ON FK4 OR FV4, REMOVE J1 JUMPER AT FAN COIL CONTROL BOARD.

10.AS AN OPTION, LOCK FURNACE INTO LOW-FIRE OPERATION AND LET O/W2 CONTROL HIGH FIRE OPERATION. REFER TO FURNACE INSTALLATION INSTRUCTIONS FOR PROPER SETUP.

11.TO ACTIVATE DEHUMIDIFY FEATURE ON CURRENT STYLE, VARIABLE-SPEED, 80 PERCENT NON-CONDENSING, FURNACE DISCONNECT GREEN (DEHUM) WIRE FROM G ON FURNACE CONTROL BOARD AND CONNECT TO DEHUMIDIFY TERMINAL DHUM ON THERMIDISTAT.

12.THE DE JUMPERS MUST BE REMOVED TO ENABLE THE DEHUMIDIFICATION FEATURE ON FURNACE.

Table 2—Accessory Usage

	REQUIRED FOR	REQUIRED FOR
ACCESSORY	LONG-LINE	SEACOAST
	APPLICATIONS*	APPLICATIONS
	(50-175 FT.)	(WITHIN 2 MILES)
Coastal Filter	No	Yes
Support Feet	No	Recommended
Puron® Balance-Port Hard	Yes†	Yes†
Shut-off TXV

*For tubing line sets between 50 and 175 ft horizontal or 20 ft vertical differential, refer to Application Guideline and Service Manual—Air Conditio ners and Heat Pumps Using Puron® Refrigerant. Crankcase heater and start assist are standard on two-speed units.

† Required for all applications.

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