Operating instructions

IMM AGSB-60 71
Controls, Settings and Functions
Table 34, Controls
DESCRIPTION FUNCTION SYMBOL SETTING RESET LOCATION
Compressor Heaters
To provide heat to drive off liquid refrigerant
when compressor is off.
HTR1-COMPR
On, when
compressor is off.
N/A
On the
Compressor
Compressor
Solenoid - Load
Loads compressor LOAD N/A N/A
On the
Compressor
Compressor
Solenoid - Unload
Unloads the compressor UNLOAD N/A N/A
On the
Compressor
Evaporator Heaters Help prevent evaporator freeze-up HTR-EVAP 38
o
F (3.3
o
C) N/A Water Heads
Electronic Expansion
Valve Board
To provide power and step control to the EXV
stepper motors commanded by the MT II.
EXV-DRIVER N/A N/A Control Panel
Electronic Expansion
Valve
To provide efficient unit refrigerant flow and
control subcooling.
EXV In Controller Code N/A
In Main Liquid
Line
Solid State Starter
Thermistor Card
To provide motor temperature protection at
about 220
o
F (104
o
C).
K2 Fault
None,
Inherent in design
Auto Power Panel
Mechanical High
High Pressure Switch
For UL, ETL, etc.,…safety code to prevent
high pressure above the relief valve.
MHPR
Refer to
OM AGS
Auto Control Panel
MicroTech II Unit
Controller
To control unit functions. Refer to OM AGS.
UNIT
CONTROLLER
N/A
Refer to
OM AGS
Control Panel
MicroTech II Circuit
Controller
To control individual circuit functions. One
per circuit. Refer to OM AGS.
CIRCUIT
CONTROLLER
N/A
Refer to
OM AGS
Control Panel
Phase Voltage Monitor
To prevent reverse rotation of the motor and
protect it from under/over voltage.
PVM N/A Auto Power Panel
Oil Return Solenoid
Controls oil flow from evaporator to
compressor and controls discharge superheat
OIL RETURN
SOLENOID
Closed when
compressor is off
N/A
Oil line from evap
to compressor
Oil Level Sensor Senses oil level in the oil separator OLS NC with oil present N/A Oil Separator
Differential Pressure
Switch
Pressure difference from compressor
discharge to oil entering compressor.
DPS 25 psig
Condenser Coil
Support
Fan VFD Controls discharge pressure FAN VFD In controller code N/A Power Panel
Control Panel Heater Maintain controller operation
HTR- CONTROL
BOX
On at 40°F N/A Control Panel
Lightning Arrestor
To protect from high voltage spikes and
surges.
LA N/A N/A Power Panel
Oil Separator Heaters
Provide heat to maintain viscosity at low
temperatures
HTR 6-13
On when compressor
is off and oil level is
present
N/A Oil Separator
Low Pressure Switch
Protects compressor from running with
insufficient oil pressure
LPS Refer to OM AGS Auto