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6 - STANDARD CONTROL OPERATIONS AND OPTIONS
6.4 - Pumps control
The main control can manage one or two water exchanger pumps,
determining each pump on/off state. Both pumps cannot run
together. The pump is turned on when this option is configured
and when the unit is running.
The pump is turned off when the unit is shut down due to an alarm
unless the fault is a frost protection error. If the pump has failed
and another pump is available, the unit is stopped and started
again with the second pump. If there is no pump available, the
unit shuts down.
Units are fitted with the flow switch, allowing for the water flow
control. For more information about actuators, see Water flow
switch in section 3.7.
6.4.1 - Pumps configuration
The pump is turned on when the option is configured in the Pump
Configuration menu (PUMPCONF) and the unit is in heating/
cooling mode, depending on installation, or in delay mode. Since
the minimum value for delay at start-up is 1 minute (configurable
between 1 and 15 minutes), the pump will run for at least one
minute before the first compressor starts.
NOTE: 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)
1. Navigate to the Configuration menu.
2. Select Pump Configuration (PUMPCONF).
3. Set Cooler Pumps Sequence [cpumpseq].
Cooler Pumps Sequence [cpumpseq]
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
1. Navigate to the Configuration menu.
2. Select Pump Configuration (PUMPCONF).
3. Set Condenser Pumps Sequence [hpumpseq].
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.
36
6.4.2 - Automatic pump selection (cooler pumps)
If two pumps are controlled and the reversing function has been
selected (PUMPCONF), the control balances the pump run time
to match the configured pump changeover delay.
If this delay has elapsed, the pump reversing function is activated
during the next time when there is no compressor running in the
system.
To set pump automatic rotation delay
1. Navigate to the Configuration menu.
2. Select Pump Configuration (PUMPCONF).
3. Set Pump Auto Rotation Delay [pump_del].
Pump Auto Rotation Delay [pump_del]
24 to 3000 h
6.4.3 - Pump protection (pump anti-stick function)
The control provides a means to automatically start the pump each
day at 14:00 for 2 seconds when the unit is off.
If the unit is fitted with two pumps, the first pump is started on even
days and the second pump is started on odd days.
Starting the pump periodically for a few seconds extends the
lifetime of the pump bearings and the tightness of the pump seal.
To set periodical pump quick start
1. Navigate to the Configuration menu.
2. Select Pump Configuration (PUMPCONF).
3. Set Pump Sticking Protection [pump_per] to "yes".
Pump Sticking Protection [pump_per]
no/yes
6.5 - Control interlock contact (EMM option)
This contact checks the status of a loop (customer safety loop).
It prevents the unit from starting if it is open when the delay at
start-up has expired. This open contact leads to an alarm shut-
down, if the unit is running (alarm 10014).
6.6 - Control point
The control point represents the water temperature that the unit
must produce. The required capacity can be decreased depending
on the unit load operating conditions.
The heat exchanger entering water temperature is controlled by
default, but the heat exchanger leaving water temperature can
also be controlled (service configuration is required).
Control point = Active setpoint + Reset
The control point is calculated based on the active setpoint and
the reset calculation. The forced value can be used instead of any
other setpoint calculation only when the unit is in the Network
operating type.
To verify the control point
1. Navigate to the Main menu.
2. Select General Parameters (GENUNIT).
3. Verify Control Point [CTRL_PNT].
Control Point [CTRL_PNT]
-20.0 to 86.1°C
-4.0 to 187.0°F
48 h
yes
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