5= regulates on 1 / 2 / 3 / 4 evaporator outlet and common outlet
6= regulates on external air temperature
Par. PA11 = Pump activation set-point in anti-freeze working mode on temperature control probe
Par. PA12 = Pump deactivation differential in anti-freeze working mode on temperature control probe
37. WATER PUMP MAINTENANCE REQUEST FUNCTION
The PA13/PA14 parameters are the evaporator water pump/evaporator support water pump working timer
set
They establish the number of working hours of the pumps, beyond which a maintenance request is made.
(the timer working threshold value at zero disables the function).
The pump is switched off if:
Unit in ON – OFF remote/stand-by
digital input configured as active evaporator water pump circuit breaker.
digital input configured as active evaporator water flow switch with manual alarm
(in defrost mode in the periods in which the compressor is in dripping OFF mode, the pump/supply
fan remain on)
If only one pump is configured, the pump keeps working; if two pumps are configured, there is the
rotation.
38. SUPPLY FAN WORKING
If a relay is configured as a supply fan any value that the par. PA06 / 0 7/ 08 assume do not intervene in
water pump outlet working.
Supply fan regulation takes place if:
the unit is configured as air/air or air/air with heating
if the Par. Supply fan operational mode
0 = Absent the supply fan is not managed
1 = Continuous Working. Supply fan switch-on is linked to unit switch-on
If the parameter PA02 is different to 0 by selecting the cooling heating mode the heat regulator requests
compressors switch-on, this only takes place if the time set has passed.
The supply fan only deactivates when the unit switches-off (unit in stand-by). If parameter PA04 is different
to 0 by positioning the unit in stand-by the water the supply fan switches-off after the time set in the
parameter.
2 = Working on compressor call. Supply fan switch-on/off is linked to compressor switch-on/off both in
cooling and heating working mode, in the case of compressor switch-on request due to temperature control.
If parameter PA02 is different to 0 the water circulation pump is activated first and after the fixed time has
passed also the compressors.
If the heat adjuster requires compressor switch-off and the parameter PA03 is different to 0, first the
compressors are deactivated and then when the set time has passed, also the supply fan.
If the parameter PA04 is different to 0 by positioning the unit in stand-by the supply fan switches-off after the
time set in the parameter.
38.1 SUPPLY FAN DURING DEFROST
The supply fan can be stopped during defrost of the air/air heating units to block the introduction of cold air
into the room during the defrost phase.
WARNING:
With several circuits configured the function is only active if:
• dF22 ! 0 when they enter defrost together
• FA05 = 0 unique condensation ventilation
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