Multiple Set Point Control - Rotex RKHBRD011ABV1 Manuel D'installation

2 Storage operation
When requesting space heating and domestic water heating
(storage) at the same time, domestic water will be heated, but as
soon as the room temperature drops 3°C from set point, space
heating will start till 0.5°C above set point, then domestic water
will be heated again till storage set point.
K
E
D
C
J
H
B
A
1
6
5
A Operation
Space heating
Domestic water heating
B Domestic hot water storage thermo-on request
C Domestic hot water tank temperature
D Room temperature thermo-on request
E Remote controller room temperature
F Domestic hot water lower limit temperature
G Domestic hot water upper limit temperature
(maximum possible storage temperature) [b-03]
H Domestic hot water reheat minimum temperature [b-00]
J Domestic hot water reheat maximum temperature [b-01]
K Remote controller thermostat set point
ON ON
OFF OFF
1 Minimum operation time for domestic water heating
(initial 10 minutes [d-00])
2 Maximum operation time for domestic water heating
(initial 30 minutes [d-01])
3 Interval minimum stop time for domestic water heating
(initial 15 minutes [d-02])
4 No simultaneous operation
5 Timers for domestic water heating start
6 Timer for space heating start
(a) The minimum operation time is only valid when room temperature is more
than 3°C lower as set point and set point J is reached.
(b) The maximum operation time is only valid when room temperature is more
than 0.5°C lower as set point and set point J is reached.
RKHBRD011~016ABV1+Y1
Indoor unit for air to water heat pump system
4PW61218-1A
+0.5°C
–0.5°C
–3.0°C
ON
OFF
G
75°C
F 35°C
ON
OFF
4
3
2
(a)
(b)

Multiple set point control

If you want to use multiple set point control, a temperature reducing
device ( ) is needed. The temperature reducing device converts
the high inlet water temperature to a reduced water outlet
temperature which will be delivered to the appliance(s).
When temperature reducing devices are installed, the system can be
configured to use multiple water set points.
The water set points can be selected in function of multiple set point
operation patterns.
Below the 2 possible patterns are explained in detail.
Multiple set point control according to pattern A
During normal operation, domestic water heating and space heating
modes are separated and activated intermittent to fulfil a
simultaneous request. Therefore multiple set point pattern A can be
configured to allow simultaneous domestic water heating and space
heating operation without intermission.
Schematic overview:
Pattern A design
Space 1 DHW
TRD
1
Protection is required by means
of a temperature reducing
device ( ) (depending on
set point)
Indoor unit
1 Domestic hot water shut off valve (field supply)
Domestic hot water tank
Temperature reducing device
Space 1 Space 1
Balancing bottle
■
During space heating operation, water is provided based on the
selected water temperature set point for space heating. A
shut-off valve (field supply) must be installed in the domestic hot
water tank coil circuit. The valve must be closed to protect the
domestic hot water tank from cooling down by lower temperature
water going through the coil during space heating. Connection
and control of this shut off valve is the responsibility of the
installer.
■
During domestic water heating operation, the water temperature
set point is normally higher than the set point requested during
space heating operation. The valve allowing water to enter the
domestic hot water tank coil is open. The heat pump will deliver
water with a higher temperature which is needed for production
of the domestic hot water. At that time, the lower temperature
appliances have to be protected against the higher water
temperature by a temperature reducing valve.
The configuration of pattern A allows 2 space heating set points and
one (same as in the classic design) domestic hot water set point.
Classic design
M
Space 1
DHW
Installation manual
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