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7.6 - Pumps control
The unit can control one or two water pump(s) per heat
exchanger (one or two cooler pumps OR one condenser pump).
7.6.1 - Pump setting
heating/cooling mode, depending on installation, or in delay
starts.
Please note that in case of units with two pumps on one heat
exchanger, only one pump can be running at a time (this
option applies only to cooler pumps).
To set the cooler pump(s)
2. Select Pump Conguration (PUMPCONF).
3. Set Cooler Pumps Sequence [cpumpseq].
Cooler Pumps Sequence [clpumpseq]
0 = No Pump
1 = One Pump Only
2 = Two Pumps Auto
3 = Pump#1 Manual
4 = Pump#2 Manual
*Values between 2 and 4 can be selected only in case of dual pumps control.
To set the condenser pump(s)
2. Select Pump Conguration (PUMPCONF).
3. Set Condenser Pumps Sequence [hpumpseq] to “1”.
Condenser Pumps Sequence [hpumpseq]
0 = No Pump
1 = One Pump Only
IMPORTANT: 61XWHZE units can control one or two
cooler pumps and only one condenser pump.
7.6.2 - Pump operation
The pump keeps running for 2 minutes after the unit goes to
the stopping mode. The pump is turned off if the unit is shut
down due to an alarm unless the fault is a freeze protection
error.
The pump can be started in particular operating conditions
unit is stopped and started again with the second pump.
7.6.3 - Automatic pump selection (cooler pumps)
been selected (PUMPCONF), the control balances the pump
running in the system.
To set pump automatic rotation delay
2. Select Pump Conguration (PUMPCONF).
3. Set Pump Auto Rotation Delay [pump_del].
Pump Auto Rotation Delay [pump_del]
24 to 3000 h 48 h
7.5.2 - Reset
machine capacity is required.
• Return water temperature (heat exchanger delta T
• 4-20 mA reset signal (4-20 mA signal / external
temperature reading indicates the load trend).
• Space temperature reset (EMM option).
in the delta T, or 4-20 mA reset signal reading, or space
temperature, the control point is reset to optimise unit
performance.
In response to a drop in the reset source, the cooling setpoint
is normally reset upwards in order to optimise unit
performance.
To set Cooling / Heating Reset Select
2. Select Reset Conguration (RESETCFG).
3. Set Cooling Reset Select [cr_sel] OR
4. Set Heating Reset Select [hr_sel].
Cooling Reset Select [cr_sel]
Heating Reset Select [hr_sel]
0 = none
1 = delta T
2 = 4-20mA control T
3 = Space Temp
The amount of reset is determined by linear interpolation
based on the following parameters:
• A reference at which reset is zero (delta T or 4-20 mA
• A reference at which reset is maximum (delta T or
•
Reset example in Cooling mode
10 Reset based on space temperature 20
3 Reset based on delta T 5
4 Reset based on analogue input 20
no reset selection full reset
Legend:
A: Maximum reset value
B: Space temp. / delta T / 4-20 mA for no reset
C: Space temp. / delta T / 4-20 mA for full reset
D: Building load
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