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2-40 HP Portable Chillers Chapter 4: Operation 37 of 78
Perform the following procedures to program the electronic High/Low Thermostat control:
Select Fahrenheit or Celsius
1. Press the Set key once to access Fahrenheit/Celsius mode
Use the Up Arrow and Down Arrow keys to toggle between Fahrenheit and Celsius.
Stage 1: Freeze Protection
2. Press the Set key again to access the low temperature set point. The screen displays
the current set point and the S1 indicator blinks on and off to indicate that the control
is in set point mode.
Use the Up Arrow and Down Arrow keys to adjust the set point. At 50ºF (10ºC)
leaving water temperature, the setting should be 42ºF (6ºC).
3. Press the Set key again to access the Stage 1 differential. The screen displays the
current differential and the DIF1 indicator blinks on and off to indicate that the
control is in differential mode.
Use the Up Arrow and Down Arrow keys to adjust the differential. The setting
should be 12ºF.
4. Press the Set key again to access Stage 1 cooling or heating mode. The screen
displays the current mode: C1 for cooling or H1 for Heating.
Use the Up Arrow and Down Arrow keys to toggle between C1 or H1. The setting
should be C1.
Stage 2: High Temperature Protection
5. Press the Set key again to access the high temperature set point. The screen displays
the current set point and the S2 indicator blinks on and off to indicate that the control
is in set point mode.
Use the Up Arrow and Down Arrow keys to adjust the set point. The setting should
be 100ºF (38ºC).
6. Press the Set key again to access the Stage 2 differential. The screen displays the
current differential and the DIF2 indicator blinks on and off to indicate that the
control is in differential mode.
Use the Up Arrow and Down Arrow keys to adjust the differential. The setting
should be 2ºF.
7. Press the Set key again to access Stage 2 cooling or heating mode. The screen
displays the current mode: C1 for cooling or H1 for Heating.
Use the Up Arrow and Down Arrow keys to toggle between C1 and H1. The setting
should be C1.