Carrier 40QA024-060 Specifications download pdf (Page 15)

Step 8 — Make Connections Between Indoor

and Outdoor Units —

The thermostat is wired between

the indoor and outdoor units to make the system complete.

CHECK ACCURATER METERING DEVICE — The cor-

rect AccuRater (bypass type) refrigerant control is required for

system capacity optimization. An AccuRater device

(see Fig. 19) is supplied with the outdoor unit. Refer to

Tables 4A-4C to determine the correct AccuRater piston size

and charge combination required for the condenser/evaporator

system being installed.

Piston style as shown in Fig. 19 is shipped with the unit.

Do not interchange components between the AccuRater device

types.

COOLING ONLY SYSTEMS — The following connec-

tions must be made to the outdoor unit for it to operate as a sys-

tem with the indoor unit:

Route 2 wires of field-supplied 18-gage AWG (American

Wire Gage) thermostat cable between the low-voltage terminal

block of the fan coil unit and the blue and brown low-voltage

wires in the outdoor unit low voltage terminal block. Connect

the wires Y1 to Y and C to C. See Fig. 20.

HEAT PUMP SYSTEMS — The following connections

must be made to the outdoor unit for it to operate as a system

with the indoor unit:

Route 5 wires of field-supplied 18-gage AWG thermostat

cable between the low-voltage terminal block of the fan coil

and the outdoor unit low-voltage terminal block. Connect Y1

to Y, R to R, O to O, W2 to W2, and C to C with the wires. See

Fig. 21.

The heat pump unit uses a timed defrost method. The timed

defrost can be field set for 30, 50, or 90 minutes. The timed de-

frost is factory set for 90 minutes.

38HDR018-060

38QRR018-060

Fig. 19 — AccuRater (Bypass Type)

Metering Device Components

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Carrier 40QA024-060 Specifications Page 15