Operating Theory
132
Cool
•
After initial start-up and pull-down to 2.0 C (3.6 F) below setpoint, the controller calls for the Cool
mode whenever:
•
Return air temperature increases more than 0.2 C (0.36 F) above setpoint.
•
Return air temperature is above setpoint and the compressor has been off for 30 minutes.
•
Controller turns on the Compressor indicator when the compressor is operating.
•
Compressor must operate for a minimum of 5 minutes after startup.
•
After initial pull-down to setpoint, controller keeps the In-range LED on as long as the return air
temperature remains less than 1.5 C (2.7 F) above setpoint.
Null
•
The controller calls for Null when the return air temperature decreases more than 2.0 C (3.6 F) below
setpoint.
•
The controller stops the compressor and condenser fan and evaporator fan.
A.
Cool
B.
In-range
C.
Null
1.
Decreasing Temperature
2.
Setpoint
3.
Increasing Temperature
Figure 103: Frozen Load Control Sequence (Setpoints at -10 C [14 F] and Below)
Summary of Contents for 098203
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Page 3: ...MAGNUM TK 60275 4 MM Rev 3 08 15 Copyright 2012 Ingersoll Rand EMEIA Printed in Ireland...
Page 193: ...Refrigeration Maintenance 191 Figure 163 Filter Drier...
Page 200: ...Refrigeration Maintenance 198 Figure 169 Receiver Tank Figure 170 Water Cooled Condenser Tank...
Page 257: ...255 Schematic Diagram RELEASED 19 Sep 2013...
Page 258: ...256 Wiring Diagram Page 1 of 2 RELEASED 19 Sep 2013...
Page 259: ...257 Wiring Diagram Page 2 of 2 RELEASED 19 Sep 2013...
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