WaterFurnace Series NXW - Manual (Page 27)

27
ENVISION 2 NKW 50Hz 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.
Unit Display and Interface cont.
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).
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.