Bryant 619CNQ VIII. Make Connections Between Indoor and Outdoor Units, Cooling Only Systems

VIII. STEP 8 — MAKE CONNECTIONS BETWEEN INDOOR AND OUTDOOR UNITS

The thermostat is wired between the indoor and outdoor units to make the system complete.

A. Check AccuRater Metering Device

The correct 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.

B. Cooling Only Systems

The following connections must be made to the outdoor unit for it to operate as a system 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.

C. 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 defrost is factory set for 90 minutes.

a38-6777

538A018-060

a38-6758

538B018-060

Fig. 19 — AccuRater (Bypass Type)

Metering Device Components

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