TABLE 1. CONTROL COMPONENT SUMMARY
-
STANDARD APPLICATIONS
CONTROL
SYMBOL SETTING
RESET
LOCATION
SIGNAL
(Note 1)
LIGHT
FUNCTION
Alarm Relay
Chiller Pump,
Waterflow Interlocks
CHWI
None
Auto/Man
None
Auto/Man
Relay
Section
Field
Supplied
None
Ext.
Fail
Actuates circuit for remote alarm (where an AL relay is used,
R9
signals
opening of a water circuit interlock.
Prevents
chiller
operation until chilled water pump is energized and
flow is established.
Cold Oil Temperature
Switch
COT
105°F
Auto/Man
Switch
Oil
Stops compressor if oil temperature entering compressor drops below
Section Temp.
settinq.
R114
Templifiers only.
Condenser Pump,
Waterflow Interlocks
CWI
None
Auto/Man
Field
Supplied
Ext.
Fail
Prevents chiller operation until condenser water pump is energized
and flow is established.
Guardistor Relay
GR
None
Auto/Man
Relay
Section
Motor
Stops compressor motor when winding temperature exceeds limit.
Temp.
Hot Gas Override
Solenoid
HGO None None
Hot Gas
Piping
None
Opens hot gas bypass at starling of 2nd compressor oil pump to
reduce starting head. Dual compressor units only.
Hot Gas Solenoid
HGS None
None
Hot Gas
Piping
None
Opens hot gas bypass from discharge to evaporator, providing false
evaporator load. Helps prevent surge conditions.
Hot Gas Thermostat
HGT
Field Set
None
Condenser
Frame
None
Energizes hot gas
solenoid
on drop in water temperature entering
evaporator (senses entering condenser water in Templifier).
High Oil Temperature
HOT
140°F
Manual Switch
Oil
Stops compressor
if
oil temperature entering compressor exceeds
set-
Switch Temp.
(R12)
Section
ing (reset auto/man with RI 14 Templifiers).
High Pressure Switch
HP
See
Manual
Switch
Disch.
Stops compressor when
discharge
pressure exceeds setting. Set
Function
Section Press
10-12
psig above design saturated condensing pressure (not to ex-
ceed 90% condenser nameplate maximum working pressure).
High
Suction
Temp.
Switch
High Discharge
Temp. Switch
HST
HT
15O’F
Auto/Man
Temp.
Surgegard Stops compressor when suction temperature exceeds setting prevents
Section
compressor surge (CEO50 compressor only).
225°F
Manual Switch High
Stops compressor when discharge gas temperature exceeds
setting.
Section Temp.
Interval On Timer
Low Casting Temp.
Thermostat
IOT
LCT
Field Set
None
Lead/Lag
None
Actuates circuit for specific time and returns to normal position after
Box time delay.
1lO’F
Auto
Temp.
Oil
Assures minimum compressor casting temperature at startup.
Section Temp.
(CE126 compressor only).
Liquid Injection
Solenoid
LIS
None None Refrig.
Piping
None
Opens liquid injection valve after compressor starts-standard on
CE126. (Optional for CE063, 079,
087,
100) (Not used on
R114
units)
Load Meter
Low Oil Temp.
Thermostat
LM
LOT
None
130°F
None
Auto
Panel
Temp.
Section
None
Displays percent of full load amps when compressor runs.
Oil
Prevents compressor start with cold oil. Set as high as conditions
Temp.
allow. Protects compressor bearings from refrigerant diluted oil.
Low Pressure
Switch
Pump Down Control
Switch
Low Pressure
Override Switch
Load Recycle
Thermostat
Liquid
Line
Solenoid
Valve
Oil Pump Contactor
LP
See
Manual
Switch Low
Stops compressor
when suction pressure drops
below setting. Set
Function Section
Press.
5 psig below shop order suction pressure.
LPC
2-5 psig
Auto
Side of
None
Stops compressor when suction pressure setting is reached-part of
above LP
Panel one-time
pump down control feature-SE units only.
LPO
2 psig
Auto Switch None
Overrides control module, unloads compressor when suction pressure
above LP
Section
approaches setting of LP cutout-prevents nuisance trip.
LRT
Field Set
None Temp. Load
Starts/stops compressor in response to load changes-stops
Section Recycle
compressor 3°F below control point. (See PF manual for LRT2
setting.)
LS
None
None Field None
Opens on call for cooling or heating. Closes when system thermostat
Supplied or controller is satisfied.
IM
None None Relay None
Starts oil pump when energized.
Section
Motor Control
Relay
Motor Cooling
Solenoid Valve
Oil Cooler
Solenoid
Oil Pressure
Diff. Switch
Oil Pump
Overload
Oil Pump Safety
Timer
MCR
MCS
ocs
OD
OL
OPT
None
None
Starter
Comp.
Energizes compressor motor starter when unit control circuit is
Run
energized.
None None Refrig. None
Opens to feed liquid refrigerant for motor cooling during compressor.
Piping operation.
None None
Chiller
None
Opens valve to permit coolant flow during oil pump operation.
Piping
50 psig Auto/Man
Lube
Oil
Stops compressor when difference between oil and suction pressure
opens
Box
Press.
drops to setting. Closes at 60 psig to permit compressor start.
Non-
Auto/Man
Lube
Oil
Stops oil pump and compressor if oil pump motor overloads electric
Adjust.
Box
Press. circuit.
60 sec.
Auto/Man
Relay
Oil
Stops pump by interrupting safety circuit if vane closed switch fails to
Section Press.
close within 60 seconds afler oil pump starts.
IM
307 / Page
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