Remote Condensing Unit And Compressor; Fan Delay Thermostat; Head Pressure By-Pass Valve; Crankcase Heater - Hussmann HGL-1BS Installation And Service Instructions Manual

√
Discharge the refrigerant-nitrogen
mixture, allowing it to blow from the
system as rapidly as possible, into an
empty cylinder. Be sure that all ser-
vice valves and solenoid valves are
open to allow all of the mixture to be
discharged.
√
Connect a deep-drain vacuum pump
to both the high and low side of the
system. Pull a vacuum on the system
to at least 1500 microns.
√
Break the vacuum by adding refriger-
ant into the system until the pressure
is above 0 psig. Always charge the re-
frigerant line into the system through
a new drier in the charging manifold
line. A 16 cubic inch drier is sufficient
for this purpose.
√
Repeat steps 2 and 3 two more times,
the third time evacuating the system
to 500 microns.
REMOTE CONDENSING UNIT -
The remote condensing unit is con-
structed of weather resistant G-90 galva-
nized steel for durability. It includes the
compressor, condenser, head pressure by-
pass valve, receiver (insulated), crankcase
heater, drier, sight glass, condenser fan
motors, fan delay thermostat, dual pres-
sure control, solenoid valve, electrical
box, and quick connects (optional).
COMPRESSOR –
The compressor is mounted on
semi-rigid, rubber pads. There are no
mounting springs so the compressor is es-
sence becomes solid mounted. DO NOT
LOOSEN THE MOUNTING BOLTS ON
THE COMPRESSOR.
FAN DELAY THERMOSTAT –
The fan delay thermostat is con-
nected to the left hand fan motor (as you
face the unit from the electrical box side)
and will leave this fan off at ambients be-
low 65ºF to insure proper condensing tem-
peratures.
HEAD PRESSURE BY-PASS VALVE –
The head pressure by-pass valve is
a pre-set, non-adjustable type. Its function
is to divert the refrigerant to the receiver
when the head pressure falls below the set-
ting so that proper head pressure is main-
tained in the system and liquid is feeding
the thermostatic expansion valve.
CRANKCASE HEATER –
The crankcase heater is located be-
low the compressor on semi-hermetic mod-
els and wrapped around on hermetic mod-
els. The heater is on at all times.
CRANKCASE PRESSURE REGULA-
TOR –
The remote units designed for the
HGL-1-T/B and HGL-2-T/B employ a
crankcase pressure regulator in the suction
line. The CPR is set for 10 psi on the re-
mote unit for both 1 and 2 door. The pur-
pose of the valve is to maintain a low suc-
tion pressure on start-up so that the
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