Application 3; Application 4 - Rotex RKHBH008AA Manuel D'installation

Domestic water heating
When domestic water heating mode is enabled (either manually by
the user, or automatically through a schedule timer) the target
domestic hot water temperature will be achieved by a combination of
the heat exchanger coil and the electrical booster heater.
When the domestic hot water temperature is below the user configured
set point, the 3-way valve will be activated to heat the domestic water
by means of the heat pump. In case of large domestic hot water
demand or a high domestic hot water temperature setting, the booster
heater (10) can provide auxiliary heating.
It is possible to connect either a 2-wire or a 3-wire 3-way
valve (8). Make sure to fit the 3-way valve correctly. For
more details, refer to "Wiring the 3-way valve" on page 14.
NOTE The indoor unit can be configured so that at low
outdoor temperatures the domestic water is exclusively
heated by the booster heater. This assures that the full
capacity of the heat pump is available for space
heating.
Details on domestic hot water tank configuration for
low outdoor temperatures can be found under "Field
settings" on page 17, field settings [5-02] to [5-04].

Application 3

Space cooling and heating application with a room thermostat
suitable for cooling/heating changeover connected to the indoor
unit. Heating is provided through floor heating loops and fan coil
units. Cooling is provided through the fan coil units only.
Domestic hot water is provided through the domestic hot water tank
which is connected to the indoor unit.
T
1 2 3 4 5
M
7
1 Outdoor unit
2 Indoor unit
3 Heat exchanger
4 Pump
5 Shut-off valve
6 Collector (field supply)
7 Shut-off valve
8 Motorised 3-way valve
(field supply)
Installation manual
4
6
FCU1
8 13 FCU2
FCU3
M
10 11
FHL1
FHL2
FHL3
12 12
10 Booster heater
11 Heat exchanger coil
12 Domestic hot water tank
13 Motorised 2-way valve
(field supply)
FCU1..3 Fan coil unit (field supply)
FHL1..3 Floor heating loop
(field supply)
T Room thermostat with
cooling/heating switch
(field supply)
Pump operation and space heating and cooling
According to the season, the customer will select cooling or heating
on the room thermostat (T). This selection is not possible by
operating the user interface.
When space cooling/heating is requested by the room thermostat
(T), the pump will start operating and the indoor unit (2) will switch to
"cooling mode"/"heating mode". The outdoor unit (1) will start
operating to achieve the target leaving cold/hot water temperature.
In case of cooling mode, the motorised 2-way valve (13) will close as
to prevent cold water running through the floor heating loops (FHL).
Make sure to connect the thermostat wires to the correct
terminals (see "Connection of the thermostat cable" on
page 13) and to configure the DIP switch toggle switches
correctly (see "Room thermostat installation configuration"
on page 15).
Wiring of the 2-way valve (13) is different for a NC (normal
closed) valve and a NO (normal open) valve! Make sure to
connect to the correct terminal numbers as detailed on the
wiring diagram.
The ON/OFF setting of the heating/cooling operation is done by the
room thermostat and cannot be done by the user interface on the
indoor unit.
Domestic water heating
Domestic water heating is as described under "Application 2" on
page 3.

Application 4

Space cooling and heating application without a room thermostat
connected to the indoor unit, but with a heating only room
thermostat controlling the floor heating and a cooling/heating
thermostat controlling the fan coil units. Heating is provided through
floor heating loops and fan coil units. Cooling is provided through the
fan coil units only.
1 2 3 4 5
7
Indoor unit for air to water heat pump system
6
T4
T5
T6
FCU1
FCU2
T
FCU3
13 14 6
M M
FHL1
FHL2
FHL3
RKHBH/X008AA
4PW50203-1A
9