88
- Check that the “W” water flow rate indicator light is on.
Other functions:
• Time delay: Water pump stop is time delayed (3 mn), but immediate in the case forcing is stopped.
• Anti-sticking: automatic operation for 5 seconds every 24 hours.
• Anti-freeze": function activated by setting micro-switch sW1-1 to "on" (delivery default setting). The pump
is started if outside temperature is below 0°C.
4.13 WATER FLOW MONITORING
Performed by A2 board -
see presentation § 3.2.4
When the circulating pump is in operation, a lack of water flow longer than 10 seconds will cause the heat pump to
stop.
The alarm light "AL" flashes.
If the lack of water flow continues for more than one minute (or if it happens more than 3 in the last hour), the water
flow fault is stored in A2 memory:
- The alarm light "AL" then remains on steady; the "W" water flow light flashes (once a second).
- The flow alarm has to be sent to the system, for that, the micro-switch sW1-2 must be set to "on".
- On A2 boards version 00 the circulating pump stops. On A2 boards versions 01 & 02, the water circulating
pump remains operating.
The alarm is reset by pressing the "reset" button, or turning the system "OFF", or by disconnecting the power.
4.14 HEAT PUMP BASE DE-ICE HEATER CONTROL
Performed by A2 board - see presentation § 3.2.4
The heater is actuated for a period of 30 mn if heat pump is in defrost and outdoor temperature
(measured by heat pump sensor “OT”) is lower than 0°C.
4.15 HEAT PUMP OUTGOING WATER TEMPERATURE ALARM
Performed by A2 board -
see presentation § 3.2.4
Note: this function is available only on A2 board in version 02.
See installation manual 1011597 concerning additional water outlet temperature sensor kit.
This alarm is detected by the TW2 sensor at the heat pump exchanger water outlet.
It is generated and stops the heat pump if the heat pump exchanger outgoing water temperature goes below a
threshold in the following cases:
- In heat mode, during defrost exclusively, if the temperature is below 16°C.
- In cool mode if the temperature is below 4°C.
This alarm is reset automatically (with a re-set differential on the threshold of + 4 K) for the first 3 events occurred the
previous hour. The "W" light of the CWC2 board flashes according to a specific rate (twice a second) to signal this
alarm. The "AL" light of the CWC2 board also flashes to signal this heat pump alarm in "automatic" phase.
If a 4th event occurs within the hour, the alarm is saved and goes to manual reset. The "AL" light of the CWC2
board remains steady to signal this heat pump alarm in "manual" phase. The alarm saved is transmitted to the
system for "GR" display. To help in troubleshooting this alarm, the "W" light continues to flash according to the
specific rate until the alarm is reset. The alarm report contact of the CWC2 board is activated.
On alarm reset, the "W" light resumes the state of the water flow input.
TW2 sensor fault:
This fault is managed like another fault on the heat pump giving rise to a "GR" system alarm.
When a sensor fault is detected, the heat pump stops and the "AL" light of the CWC2 board flashes during the
automatic reset phase. The "W" light of the CWC2 board flashes very quickly (flickers) to signal this alarm.
If the sensor fault persists, the alarm is saved after 30 minutes and goes into manual reset. The "AL" light of the
CWC2 board remains steady to signal this heat pump alarm in "manual" phase. The alarm saved is transmitted to
the system for "GR" display. To help in troubleshooting this alarm, the "W" light continues to flicker until the
alarm is reset.
On alarm reset, the "W" light resumes the state of the water flow input.
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