Modes of Operation
CHS-SVN011C-EN
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to defrost continues until the thermostat is satisfied. To
change the timing sequence, see the section in this
manual on TIMERS.
3. “AH” Mode
Notes:
•
In “AH” mode the unit is designed to operate
autonomously and is typically for above 32°
applications.
•
In “AH” mode shut off the electric heating element
breaker (60 amp.) located inside the control cabinet.
•
In “AH” mode turn the defrost timer to the lowest time
value setting.
•
The fan mode is either VFD or BYPASS (soft start)
depending on the fan selection switch position on the
control cabinet door.
Sequence of operation
The thermostat calls for cooling then simultaneously, the
bypass valve energizes and the fan comes on. After the
thermostat is satisfied the fan shuts off and the bypass
valve is deenergized (rerouting the flow of chilled water
around the cooling coil). On this mode the unit will not
cycle from cooling onto heating.
