Remote Refrigeration Operation
Use pressure gauges to set pressure control.
Refrigeration R449A Charge
CHARGED IN FIELD
Remote Low Press. Switch Cut In
50 psi
Remote Low Press. Switch Cut Out
15 psi
Adjustable Head Master
200 psi
Remote High Press. Switch Cut Out
400 psi
The remote models are designed to use 449A refrigerant and shipped from the factory with the
evaporator coil, expansion valve, and refrigerant solenoid valve. Filter Drier must be installed in the
field. The electronic control runs identical to the Self-Contained models except the electronic control
opens and closes a refrigeration solenoid valve located on the liquid 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 at the condensing unit to open and
shut off the remote compressor.
The condensing unit and pressure controls may be 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 wiring diagram below.
1.
Mount condensing unit as close to the remote display case as practical. The refrigeration line should
be as short as possible and should not exceed 100 feet.
2.
Refrigeration parts between condensing unit and case are typically supplied by installing contractor.
3.
Route properly sized and designed refrigeration lines from the condensing unit to the cabinet.
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 should be used through tubing while brazing refrigeration lines.
4.
Suction line must be insulated the entire length with Armaflex (or equivalent). Do not run liquid line
inside insulation with suction line.
5.
If remote control is not supplied by Federal Industries, the remote high/low-pressure control must be
mounted, wired and pressures set by the installer.
6.
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. 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
DRIER/FILTER
FIELD CONNECTION
HOT
FUSED
POWER
SUPPLY
DEFROST
TERMINATE
PROBE
ELECTRONIC
CONTROL
AIR TEMP. CONTROL PROBE
FUSED
CASE
POWER
Refrigerated Self-Serve Merchandiser (High Profile)
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