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11 MANAGEMENT OF THE WATER PUMPS
11.1 Pump 1
Pump 1 is assigned to the main hydraulic network. Therefore, it is used in all configurations:
- If P2 = air-to-water or reversible air-to-water and P25 = 2, it will
be managed alternately with Pump 2.
The pump that has run for the shortest amount of time starts up first.
- Otherwise, the pumps may be turned on using the On/Off button
(and automatic operation control input closed).
The pump is shut off 1 minute after the last control stage turns off.
11.2 Pump 2
Pump 2 is used only in certain configurations:
A) If P2 = water-to-water, pump 2 is assigned to the customer‟s
secondary network and its control mode is determined by P108.
- If P108 = depending on control mode, the pump control is linked
to the unit control:
Pump x is turned on before the first control stage (where x is the
value entered in P109).
The pump is shut off 1 minute after the last control stage turns off.
Automatic time delay countdown.
This time delay is maintained during test mode.
- If P108 = depending on On/Off, the pump control is linked to the
operation of the unit.:
. The pump is turned on (via On/Off and with the automatic
operation control input closed; or via On/Off, with the automatic
operation control input closed and winter protection activated by
outdoor temperature; or remotely via a PC, modem or other).
The pump is immediately turned off when P108 is changed and
switches from On/Off control to Depending on control mode
(unless control mode called for).
The pump is shut off 1 minute after the last control stage turns off.
B) If P2 = air-to-water or reversible air-to-water, it depends on P25
- If P25 = 0 or 1 (only one pump supplied.) there is no pump 2.
- If P25 = 2, the unit is supplied with a backup pump. This pump is
managed by On/Off control and runs alternately with pump 1. The
pump that has run for the shortest amount of time starts up first.
The next time the machine is turned off by the control after 7 days
of operation with the same pump, the pumps are switched (by
turning off the one that was running) in order to balance the
runtimes.
The pump is shut off 1 minute after the last control stage turns off.
11.3 Pump management if P2 = 3 (reversible air-to-water) + heating mode + P111 = Boiler
Parameter P27 is used to have the pump controlled by the operation of the boiler.
A) If P27 = Yes: When the boiler is turned on, the pump is shut off
unless there is a risk of the unit freezing (outdoor temperature ≤
P52 and P261 ≤ 30°C).
A tank with four nozzles must be installed on the system and
the boiler must have its own pump and its own control with its own
protections
The boiler will continue to operate if the heat pump malfunctions.
B) If P27 = No: The pump is controlled by the On/Off button. It continues to run even when the boiler is authorised to operate.
11.4 Unseizing and switching the pumps
If any of the pumps remains off (for a reason other than a fault) for over 7 days, it must be turned on between 9.00 am and 9.00 pm and be
allowed to run for 2 minutes.
- If P25 = 2, the pump with the longest runtime is turned off
after being unseized.
- If the unit is turned off via the On/Off button or the automatic
operation control and a water flow fault occurs during
unseizing, both pumps are turned off.
12 WINTER PROTECTION
12.1 Frost protection of pumps and heat exchangers while unit is off
This function protects the pump(s) and the heat exchanger(s) from freezing.
The heater and heat trace cable outputs are enabled only when P2 = air-to-water and reversible air-to-water.
P265 becomes visible if P2 = air-to-water and reversible air-to-water
12.1.1 Use with pure water: If P52 ≥ its standard adjustment value based on the refrigerant type:
1) Heater control:
- If exchanger ambient temperature ≤ P220 or ambient temp.
sensor fault and water inlet temperature≤ (P52 + 2) + all
compressors off + pump off if P25 ≠ 0 → Heaters on.
- If ambient temperature sensor fault and water inlet temperature ≤
(P52 + 2) + all compressors off + pump off if P25 ≠ 0 → Heaters on.
- If exchanger ambient temperature > P220 + P222 or water inlet
temperature ≥ (P52 + 2) + P222 or if a compressor or a pump is
on if P25 ≠ 0 → Heaters off.
2) Heat trace cable control:
- If outdoor temperature sensor ≤ P220 and water inlet
temperature ≤ 20°C + all compressors off + pump off
if P25 ≠ 0 → Heat trace cables on
- If outdoor temperature sensor fault and water inlet temperature ≤
20°C + all compressors off + pump off
if P25 ≠ 0 → Heat trace cables on
- If outdoor temperature > P220 + P222 or water inlet temperature
≥ 20°C + P222 or if a compressor or a pump is on → Heat trace
cables off.
P 2 7 P U M P C O N T R O L L E D
B Y B O I L E R Y E S
P 2 7 P U M P C O N T R O L L E D
B Y B O I L E R N O
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