27
RW SERIES REVERSIBLE CHILLER INSTALLATION MANUAL
Menu and Menu Contents
Alarm
• Displays unit alarms until the unit has been reset (Unit alarms
can be reset by holding both the Escape (ESC) key and Return
(
←
) key for five seconds or by power cycling the unit.)
Alarm History
If a fault occurs the fault will be recorded in history viewable on the
unit mounted display. Each fault type will be displayed in the history
menu with a number between 0 and 3. A reading of 3+ means that
the fault has occurred more than 3 times in the past. The history
menu can be cleared with a power cycle only. Alarm date and time
are not included in the history.
Unit Alarms
Unit alarms are shown on the display once the unit has locked out.
Load Flow – Load Flow Switch is Not Closed
• The load flow switch must be closed prior to either
compressor starting and must remain closed for the entire run
time of the compressor(s).
Low Pressure 1 – Compressor Circuit 1 Low
Pressure Switch
• The low pressure switch is checked before compressor start up
and is monitored during compressor operation.
Src FP 1 Temp Low – Source Freeze
Detection Sensor 1
• The source freeze detection sensor on compressor circuit 1 has
reached its setpoint.
Src FP 1 Sensor Bad
• The sensor for source freeze detection on compressor circuit 1
is unreliable or is not reading.
LD FP 1 Temp Low – Load Freeze Detection Sensor 1
• The load freeze detection sensor on compressor circuit 1 has
reached its setpoint.
LD FP 1 Sensor Bad
• The sensor for load freeze detection on compressor circuit 1 is
unreliable or is not reading.
Source Flow – Source Flow Switch is Not Closed
• The source flow switch must be closed prior to either
compressor starting and must remain closed for the entire run-
time of the compressor(s).
Unit Display and Interface cont.
High Pressure 1 – Compressor Circuit 1 High
Pressure Switch
• If high pressure switch 1 opens at any time during compressor 1 run
time the compressor will be shut down immediately.
Low Pressure 2 - Compressor Circuit 2 Low
Pressure Switch
• The low pressure switch is checked before compressor start up
and is monitored during compressor operation.
Src FP 2 Temp Low - Source Freeze Detection Sensor 2
• The source freeze detection sensor on compressor circuit 2 has
reached its setpoint.
Src FP 2 Sensor Bad
• The sensor for source freeze detection on compressor circuit 2
is unreliable or is not reading.
LD FP 2 Temp Low - Load Freeze Detection Sensor 2
• The load freeze detection sensor on compressor circuit 2 has
reached its setpoint.
LD FP 2 Sensor Bad
• The sensor for load freeze detection on compressor circuit 2 is
unreliable or is not reading.
High Pressure 2 - Compressor Circuit 2 High
Pressure Switch
• If high pressure switch 2 opens at any time during compressor 2 run
time the compressor will be shut down immediately.
Comp Start Failure – Compressor Start Failure
• If either compressor fails to start when the contactor pulls in the
compressor current switch will cause that compressor to be locked
out after 2 retries. The other compressor will continue to operate
normally in this condition.
