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RLC-PRC016-EN46
Mechanical
Specifications
General
Units are leak and pressure tested at 450
psig high side, 300 psig low side, then
evacuated and charged. Packaged units
ship with a full operating charge of oil
and refrigerant. Unit panels, structural
elements and control boxes are
constructed of 12-gauge galvanized steel
and mounted on a welded structural
steel base. Unit panels and control boxes
are finished with a baked on powder
paint, and the structural base with an air
dry paint. All paint meets the
requirement for outdoor equipment of
the U.S. Navy and other federal
government agencies.
Evaporator
The evaporator is a tube-in-shell heat
exchanger design with internally finned
copper tubes roller expanded into the
tube sheet. The evaporator is designed,
tested and stamped in accordance with
ASME for a refrigerant side working
pressure of 300 psig. The evaporator is
designed for a water side working
pressure of 215 psig. Water connections
are grooved pipe. The evaporator has
one water pass with a series of internal
baffles. Each shell includes a vent, a
drain and fittings for temperature control
sensors and is insulated with
3
/4-inch
Armaflex II or equal insulation (K=0.26).
Heat tape with thermostat is provided to
protect the evaporator from freezing at
ambient temperatures down to -20°F.
Condenser and Fans
Air-cooled condenser coils have
aluminum fins mechanically bonded to
internally finned seamless copper
tubing. The condenser coil has an
integral subcooling circuit and also
provides oil cooling for the compressor
bearing and injection oil. Condensers are
factory proof and leak tested at
506 psig.
Direct-drive vertical discharge condenser
fans are dynamically balanced. Three-
phase condenser fan motors with
permanently lubricated ball bearing and
internal thermal overload protection are
provided. Standard units will start and
operate down to 25°F ambient.
Compressor and Lube Oil System
The rotary screw compressor is semi-
hermetic, direct drive, 3600 rpm, with
capacity control slide valve, rolling
element bearings, differential refrigerant
pressure oil pump and oil heater. The
motor is a suction gas cooled,
hermetically sealed, two-pole squirrel
cage induction motor.
Oil separator and filtration devices are
provided separate from the compressor.
Check valves in the compressor
discharge and lube oil system and a
solenoid valve in the lube system are
provided.
Remote Evaporator
The evaporator is a tube-in-shell heat
exchanger, designed with internally-
finned copper tubes that are rolled
expanded into the tube sheet. The
evaporator is designed, tested and
stamped for a refrigerant side working
pressure of 300 psig, in accordance with
ASME. The evaporator is designed for a
water side working pressure of 215 psig.
Water connections are victaulic. The
evaporator has one water pass, with a
series of internal baffles.
Each shell includes a vent and drain
connection, as well as factory-mounted
entering and leaving water temperature
control sensors and evaporator
refrigerant temperature sensors. The
evaporator is insulated with
3
/4-inch
Armaflex II or equal insulation (K=0.26).
The evaporator is skid-mounted and is
shipped separately from the outdoor
(condensing) unit. Refrigerant
accessories, including electronic
expansion valve, moisture indicating
sightglass and removable core filter
drier, are shipped with the evaporator
skid. All refrigerant connections are
routed to one end of evaporator skid for
easy connection. All electrical wiring is
factory installed and routed to a terminal
box (entering and leaving water
temperature sensor, evaporator
refrigerant temperature sensor and
electronic expansion valve control
wiring). Suction refrigerant temperature
sensors (two) must be field installed in
the field suction line piping next to the
evaporator connections.