38.2 HOT START FUNCTION
This function is only active with air/air units configured as heatings. It allows start-up of the supply fan only if
the temperature of the condensing coil is sufficiently hot. In this way cold air flow into the environment is
prevented.
PA15 Hot start set-point
It allows to set a temperature value detected by the probe configures as common evaporator air outlet, below
which the supply fan is blocked.
PA16 Hot start differential
Allows to set a differential on the hot start function
The supply fan is off if:
Unit in ON – OFF remote/stand-by
digital input configured as supply fan circuit breaker is active.
digital input configured as active evaporator water flow switch with manual alarm
39. FUNCTION OF SUPPLY FAN MAINTENANCE REQUEST
The PA13 parameter is the supply fan working timer set
They establish the number of working hours of the supply fan, beyond which a maintenance request is
made. (the timer working threshold value at zero disables the function).
40. CONDENSER WATER PUMP WORKING
40.1 ONLY ONE RELAY CONFIGURED AS CONDENSER WATER PUMP
If only one relay is configured as condenser water pump, any values the rotation pars. assume, they will not
intervene with water pump outlet working.
Regulation of the water pump takes place:
If the Condenser pump operational mode Par.
0 = Absent the pump is not managed
1 = Continuous Working. Pump switch-on is linked to unit switch-on
If the parameter PA18 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 water pump only deactivates when the unit switches-off (unit in stand-by). If parameter PA20 is different
to 0 by positioning the unit in stand-by the water pump switches-off after the time set in the parameter.
2 = Working on compressor call. Pump 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
PA18 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 PA19 is different to 0, first the
compressors are deactivated and then when the set time has passed, also the water circulation pump
If the parameter PA20 is different to 0 by positioning the unit in stand-by the water pump switches-off after
the time set in the parameter.
The pump is switched off if:
the unit is positioned in OFF from remote
digital input configured as condenser water pump circuit breaker is active.
digital input configured as active evaporator water flow switch with manual reset alarm
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