7 Configuration
Installer and user reference guide
39
SERHQ020~0 SEHVX20~64BAW
Split packaged air-cooled water chiller
4P508020-1B – 2018.04
[9‑00] Leaving water temperature compensation value for
heating operation
[9‑01] Leaving water thermistor auto corrective function
This function will take into account the outdoor ambient conditions
and correct the measured value which will be used for the logic.
E.g. when the ambient temperature is high during cooling mode, the
logic will correct the measured value of the leaving water thermistor
to a lower value to take into account influence of high ambient
temperatures in the measurement.
[9-02]
This setting is not applicable.
[9‑03] Leaving water temperature compensation value for
cooling operation
[9-04]
This setting is not applicable.
[A] Option setup
[A-00]
This setting is not applicable.
[A-01]
This setting is not applicable.
[A‑02] Return water temperature undershoot value
This setting makes it possible to set the allowable undershoot when
operating the unit during heating THERMO ON/OFF condition.
The unit will go in THERMO ON only if the return water temperature
(RWT) goes below the setpoint minus the differential temperature:
Thermo ON: RWT<Setpoint–(([A‑02]/2)+1)
The setting [A‑02] has a variability range from 0 to 15 and the step is
1 degree. The default value is 5, meaning that the differential
temperature default value is 3.5.
[A‑03] Leaving water temperature overshoot/undershoot value
This setting makes it possible to set the allowable overshoot
(heating)/undershoot (cooling) when operating the unit during
leaving water control.
[b] Settings are not applicable
[C] Leaving water temperature limits
This setting is used to limit the selectable leaving water temperature
on the user interface.
[C‑00] Maximum leaving water setpoint in heating operation
[C‑01] Minimum leaving water setpoint in heating operation
[C‑02] Maximum leaving water setpoint in cooling operation
[C‑03] Minimum leaving water setpoint in cooling operation
This depends on field setting [A‑04].
[C-04]
This setting is not applicable.
[d] Settings are not applicable
[E] Service mode
[E‑00]
This setting is not applicable.
[E‑01]
This setting is not applicable.
[E‑02]
This setting is not applicable.
[E‑03]
This setting is not applicable.
[E‑04] Pump only operation (air purge function)
When installing and commissioning the unit it is very important to
remove all air from the water circuit.
This field setting operates the pump to improve air removal from the
unit without actually operating the unit. The pump will run for
10 minutes, stop 2 minutes, etc.
[E‑04]
Description
0 (default)
Normal operation of the unit
1
Automatic air purge operation during
108 minutes
2
Automatic air purge operation during
48 minutes
[F] Option setup
[F‑00] Return water temperature overshoot value
This setting makes it possible to set the allowable overshoot when
operating the unit during cooling THERMO ON/OFF condition.
The unit will go in THERMO ON only if the return water temperature
(RWT) goes above the setpoint plus the differential temperature:
Thermo ON: RWT<S(([F‑00]/2)+1)
The setting [F‑00] has a variability range from 0 to 15 and the step is
1 degree. The default value is 5, meaning that the differential
temperature default value is 3.5.
7.3
Switching between cooling and
heating
Switching the unit between cooling and heating can be done in
2 different ways, depending on how the temperature is controlled,
i.e. based on room temperature or based on leaving water
temperature.
Switching between cooling and heating with the user interface
If unit control is based on room temperature (external room
thermostat or user interface room thermostat), switching between
cooling and heating is done by pushing the cooling/heating button on
the user interface.
TO IN/D
UNIT
F1 F2
DS1
1 2 3 4
OFF
ON
O
U
T
I
N
F1 F2 P1 P2
P1 P2
a
a
User interface
Switching between cooling and heating with the cool/heat
selector
If unit control is based on leaving water temperature, we suggest
using the ABC terminals on the outdoor unit. The location of the
terminals is shown in the following figure.
