Carrier 38HD User Manual download pdf (Page 6)

________

ARRANGEMENT A-(COOLING ONLY)

ARRANGEMENT B-ONE TRANSFORMER

(COOLING AND ONE-STAGE HEATING)

ARRANGEMENT C-ONE TRANSFORMER

(COOLING AND TWO-STAGE HEATING)

*IFR and IFM are located in furnace on heating-cooling applica

tions If accessory IFR is required for cooling-only applications,

locate (IFR) in fan coil

C —

HC -

IFM —

IFR —

Trans —

Contactor (12-va)

Heating Control

Indoor Fan Motor

Indoor Fan Relay

Transformer

____

—. Field Wiring

- Factory Wiring

NOTE Refer to unit wiring label for wire colors CtoGandCtoY

connections

Fig. 6 — Typical Control Circuit Connections

CONTROL CIRCUIT WIRING — Control voltage is

24 volts (40 va minimum). See Fig. 6 and unit label

diagram for field-supplied wiring details. Route control

wires through opening in unit side panel to connection in

unit control box.

TB — Terminal Board

— O

------

TB Connections

Field Wiring

Factory Wiring

NOTE; For wire runs up to 50 ft, use no. 18 AWG insu

lated wire (35 C minimum). For 50 to 75 ft, use no. 16

AWG insulated wire (35 C minimum). For over 75 ft, use

14 AWG insulated wire (35 C minimum).

NOTE: Operation of unit on improper line voltage con

stitutes abuse and could affect Carrier warranty See

Table 3. Do not install unit in system where voltage may

fluctuate above or below permissible limits.

See Table 3 for recommended fuse sizes. When making

electrical connections, provide clearance at unit for refrig

erant piping connections

Use furnace oi fan coil transformer as 24-v (40-va

minimum) supply for system as shown in Fig. 7 or use

accessory transformer.

A WARNING

To avoid personal injury, be sure indoor blower has

stopped before attempting service or maintenance.

Operating voltage to compressor must be within

voltage range indicated on unit nameplate. On 3-phase

units voltages between phases must be balanced within

2% U se the following formula to determine the % voltage

imbalance.

% Voltage Imbalance

max voltage deviation frqm average voltage

Fig. 7 — Line Power Connections

100 X

average voltage

1 2 3 4 5 6 7 8 9 10 11 12

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Carrier 38HD User Manual Page 6

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