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The remote models are designed to use R449 refrigerant and shipped from the factory with the evaporator coil, expansion
valve, sight glass, and refrigerant solenoid valve. Filter Drier must be installed in field. Electronic control runs identical to
the self-contained models except the electronic control opens and closes a refrigeration solenoid valve located on the
suction line instead of turning on and off a compressor. The solenoid valve closes and shuts off the refrigeration flow to
the unit and initiates a pump down cycle. This will allow the remote low-pressure switch to open and shut off remote
compressor.
The condensing unit and pressure controls are optionally supplied from the factory for remote location installation. The
condensing unit must be mounted and wired by the installer. The high low-pressure switch must be wired in series with
the compressor power supply as shown in diagram below
1.
Mount condensing unit indoors as close to the remote display case as practical. The refrigeration line should be
as short as possible and must not exceed 30 feet.
2.
All refrigeration and/or electrical materials between the condensing unit and display case are to be supplied by
installing contractor.
3.
Route properly sized and designed refrigeration lines from the condensing unit to the cabinet.
4.
Horizontal suction lines should be pitched downward towards the condensing unit at least ½” per 10’ run to aid
the oil drainage. A “P” trap must be installed in the suction line at the foot of every riser to insure oil return. Dry
nitrogen must be used to flow through tubing while brazing refrigeration lines.
5.
Suction line must be insulated the entire length with Armaflex (or equivalent). Do not run liquid line inside
insulation with suction line.
6.
The remote high/low-pressure control must be mounted, wired and set pressures by the installer.
7.
Leak check condensing unit, cabinet, and all connecting tubing. Cabinet and condensing unit tubing should be
checked to insure no leaks occurred during shipping or from rough handling.
8.
Make certain all refrigeration valves are opened and evacuate system to 500 microns. Charge the system with
refrigerant type specified on the data plates.
REMOTE
HIGH LOW
PRESSURE
CONTROL
LIQUID LINE
SUCTION LINE (INSULATED)
REMOTE
CONDENSING
UNIT
EVAPORATOR
COILS
DISPLAY CASE
EXPANSION
VALVE
HIGH
LOW
LIQUID LINE
SOLENOID VALVE
SIGHT GLASS
DRIER/FILTER
FIELD CONNECTION
HOT
FUSED
POWER
SUPPLY
DEFROST
TERMINATE
PROBE
ELECTRONIC
CONTROL
AIR TEMP. CONTROL PROBE
FUSED
CASE
POWER
Figure 1 - Remote Refrigeration Diagram
