82
IMM AGS-2
Controls, Settings and Functions
Table 44, 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
Evap. Barrel
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
Controllers
To control individual circuit functions.
One per circuit. Refer to OM AGS.
CIRCUIT
CONTROLLER
N/A
Refer to
OM AGS
Control Panel
Oil Level Sensor
Senses oil level in compressor
OLS
NC with oil
present
N/A
On
compressor
Fan VFD (Optional)
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
High Oil Delta-P
Switch
Protects compressor from running with
insufficient oil pressure
LPS
Refer to OM AGS Auto
