Installation manual
29
RKHBH/X008BA
Indoor unit for air to water heat pump system
4PW54224-1A
■ [8-04] Additional running time at [4-02]/[F-01]: specifies the
additional running time on the maximum running time at
outdoor temperature [4-02] or [F-01]. See figure below.
[9] Heating and cooling set point ranges
The purpose of this field setting is to prevent the user from selecting
a wrong (i.e., too hot or too cold) leaving water temperature. Thereto
the heating temperature set point range and the cooling temperature
set point range available to the user can be configured.
■ [9-00] Heating set point upper limit: maximum leaving water
temperature for heating operation.
■ [9-01] Heating set point lower limit: minimum leaving water
temperature for heating operation.
■ [9-02] Cooling set point upper limit: maximum leaving water
temperature for cooling operation.
■ [9-03] Cooling set point lower limit: minimum leaving water
temperature for cooling operation.
■ [9-04] Overshoot setting: defines how much the water
temperature may rise above the set point before the
compressor stops. This function is only applicable in heating
mode.
[C] Setup on EKRP1HB digital I/O PCB
Alarm output logic
■ [C-01] Alarm output logic: defines the logic of the alarm
output on the EKRP1HB digital I/O PCB.
[C-01]=0, the alarm output will be powered when an alarm
occurs (default).
[C-01]=1, the alarm output will not be powered when an
alarm occurs. This field setting allows for distinction between
detection of an alarm and detection of a power failure to the
unit.
Bivalent operation
Applies only to installations with an auxiliary boiler (alternating
operation, parallel connected). The purpose of this function is to
determine —based on the outdoor temperature— which heating
source can/will provide the space heating, either the Rotex indoor
unit or an auxiliary boiler.
The field setting "bivalent operation" apply only the indoor unit space
heating operation and the permission signal for the auxiliary boiler.
When the "bivalent operation" function is enabled, the indoor unit will
stop automatically in space heating operation when the outdoor
temperature drops below "bivalent ON temperature" and the
permission signal for the auxiliary boiler becomes active.
When the bivalent operation function is disabled, the space heating
by indoor unit is possible at all outdoor temperatures (see operation
ranges) and permission signal for auxiliary boiler is always
disactivated.
■ [C-02] Bivalent operation status: defines whether bivalent
operation is enabled (1) or disabled (0).
■ [C-03] Bivalent ON temperature: defines the outdoor
temperature below which the permission signal for the
auxiliary boiler will be active (closed, KCR on EKRP1HB) and
space heating by indoor unit will be stopped.
■ [C-04] Bivalent hysteresis: defines the temperature difference
between bivalent ON temperature and bivalent OFF
temperature.
Permission signal X1–X2 (EKRP1HB)
Heating Cooling
t Time
T
A
Ambient (outdoor) temperature
anti-recycle time
maximum running time
The full advantage of [8-04] will be applicable if setting
[4-03] is not 1.
CAUTION
■ In case of a floor heating application, it is important to
limit the maximum leaving water temperature at
heating operation according to the specifications of
the floor heating installation.
■ In case of a floor cooling application, it is important to
limit the minimum leaving water temperature at
cooling operation (field setting of parameter [9-03]) to
16~18°C to prevent condensation on the floor.
[C-01] Alarm No alarm
No power supply
to unit
0
(default)
Closed output Open output Open output
1 Open output Closed output Open output
t
T
A
t
T
A
0
[8-01]
[5-03] [4-02]
[8-02]
[8-01]+
[8-04]
0
[8-01]
[F-01] 35°C
[8-02]
[8-01]+
[8-04]
T
A
Outdoor temperature
CAUTION
Make sure to observe all rules mentioned in
application 5 when bivalent operation function is
enabled.
Rotex shall not be held liable for any damage resulting
from failure to observe this rule.
■ The combination of setting [4-03]=0/2 with
bivalent operation at low outdoor temperature
can result in domestic hot water shortage.
■ The bivalent operation function has no impact on
the domestic water heating mode. The domestic
hot water is still and only heated by the indoor
unit.
■ The permission signal for the auxiliary boiler is
located on the EKRP1HB (digital I/O PCB).
When it is activated, the contact X1, X2 is closed
and open when it is disactivated. See figure for
the schematic location of this contact.
T
A
[C-03]
[C-04]
closed
open
YC Y1 Y2 Y3 Y4
X1 X2 X3 X4
OFF ON
X2M
SS1
X1M
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