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Each compressor is energized by a corresponding com-
pressor contactor.
operation. If Interlink compressor replacement is neces-
IMPORTANT
Some scroll compressors have an internal vacuum
protector that will unload scrolls when suction
pressure goes below 20 psig. A hissing sound
will be heard when the compressor is running
unloaded. Protector will reset when low pressure
in system rises above 40 psig. DO NOT REPLACE
COMPRESSOR.
2-Crankcase Heaters HR1, HR2
-
around compressor B2. Crankcase heater wattage varies
by compressor size.
3-High Pressure Switches S4, S7
The high pressure switch is an auto-reset SPST N.C.
switch which opens on a pressure rise. All units are
switch is located in the compressor discharge line. On al-
line in the blower section. Switches are wired in series
with the compressor contactor coil.
only S4 is used. S4 is located on the common compressor
discharge line and is wired to both compressor contactors
opens and the respective compressor is de-energized (the
economizer can continue to operate). When discharge
pressure switch will close.
locking out. This means the control allows three high pres-
sure trips per one thermostat demand. The control can be
reset by breaking and remaking the thermostat demand or
manually resetting the control.
4-Filter Drier
each refrigerant circuit. The drier removes contaminants
and moisture from the system.
5-Low Pressure Switches S87, S88
The low pressure switch is an auto-reset SPST N.O.
switch (held N.C. by refrigerant pressure) which opens on
a pressure drop. All units are equipped with this switch.
(compressor one) and S88 (compressor two) are wired to
-
es by shunting the switches during start up until pressure
compressor is locked out. The control is reset by breaking
and remaking the thermostat demand or manually reset-
ting the control.
+
compressor( s) is(are) de-energized. The switch automat-
+
-
erant being added.
6-Condenser Fans B4 and B5
condenser fans have single-phase motors. The fan as-
sembly may be removed for servicing and cleaning.
7-Temperature Sensors RT46, RT47, RT48 & RT49
Units are equipped with four factory-installed thermistors
-
ant circuit.
The thermistors provide the Unit Controller with constant
-
frigeration circuit. These temperatures are used as feed-
back in certain modes of unit operation.
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