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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