KlassKeeper – Installation, Operation, and Maintenance Manual
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© Copyright 2013 CGC Group Inc.
Last Revised April 2020 Installation, Operation, and Maintenance Manual is Subject to Change without Notice.
During ERV operation, if the fresh air leaving temperature (FRSH-LAT) drops below 40°F, both the heat
wheel and ERV fan will be de-energized and an alarm will be activated. This condition may be an indication
of a heat wheel malfunction.
Alarms
The KlassKeeper heat pump is monitored during its operation for correct performance. In the event that
a potentially damaging or harmful situation is encountered, the unit will be deactivated and an alarm will
be generated.
General Alarm Contact
–
K7
Digital output relay K7 is a dry-contact that is energized whenever an alarm is currently in place. Once the
alarm condition has been alleviated, this alarm contact will be de-energized.
Alarm LED
–
Flashcode
The Flex controller has a multi-colored Alarm LED that is used to communicate the previous alarm (if any)
through the use of flashcodes. If there have been no alarms, this LED will be green. If an alarm has
occurred, this LED will flash red. The flashcodes are listed below:
Green = OK, no alarms have occurred since reset.
1 = Low Discharge Air Temperature
2 = Low Refrigerant Temperature
3 = Low Water Temperature
4 = High Water Temperature
5 = Low Refrigerant Pressure
6 = High Refrigerant Pressure
7 = Heatwheel Malfunction
8 = Condensate Alarm
10 = System Lockout
Alarm Output (0-10VDC)
Analog Output 1 (AN1) will also output a voltage between 0-10VDC (+\- 0.2VDC) which serves as an
indicator of previous alarms (if any). The output voltages associated with each alarm are outlined below:
0 VDC = OK, no alarms have occurred since reset.
1 VDC = Low Discharge Air Temperature
2 VDC = Low Refrigerant Temperature
3 VDC = Low Water Temperature
4 VDC = High Water Temperature
5 VDC = Low Refrigerant Pressure
6 VDC = High Refrigerant Pressure
7 VDC = Heatwheel Malfunction
8 VDC = Condensate Alarm
10 VDC = System Lockout
