Application 5 - Rotex RKHBH008BA Installation Manual

1 Outdoor unit
2 Indoor unit
3 Heat exchanger
4 Pump
5 Shut-off valve
6 Collector (field supply)
7 Shut-off valve
9 By-pass valve (field
supply)
13 Motorised 2-way valve
to shut off the floor
heating loops during
cooling operation (field
supply)
Pump operation
With no thermostat connected to the indoor unit (2), the pump (4) can
be configured to operate either as long as the indoor unit is on, or
until the required water temperature is reached.
NOTE Details on pump configuration can be found under
"Pump operation configuration" on page 22.
Space heating and cooling
According to the season, the customer will select heating or cooling
through the user interface on the indoor unit.
The outdoor unit (1) will operate in heating mode or cooling mode to
achieve the target leaving water temperature.
With the unit in heating mode, the 2-way valve (13) is open. Hot water
is provided to both the fan coil units and the floor heating loops.
With the unit in cooling mode, the 2-way valve (13) is closed to
prevent cold water running through the floor heating loops (FHL).
When closing several loops in the system by remotely
controlled valves, it might be required to install a by-pass
valve (9) to avoid the flow switch safety device from being
activated. See also "Application 2" on page 4.
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
user interface on the indoor unit.
RKHBH/X008BA
Indoor unit for air to water heat pump system
4PW54224-1A
14 Motorised 2-way valve for
activation of the room
thermostat (field supply)
FCU1..3 Fan coil unit with
thermostat (optional)
FHL1..3 Floor heating loop
T Heating only room
thermostat (optional)
T4..6 Individual room
thermostat for fan coil
heated/cooled room
(optional)

Application 5

Space heating with an auxiliary boiler (alternating operation)
Space heating application by either the Rotex indoor unit or by an
auxiliary boiler connected in the system. The decision whether either
the RKHB* indoor unit or the boiler will operate can be achieved by
an auxiliary contact or an RKHB* indoor controlled contact.
The auxiliary contact can e.g. be an outdoor temperature thermostat,
an electricity tariff contact, a manually operated contact, etc. See
"Field wiring configuration A" on page 7.
The RKHB* indoor unit controlled contact (also called 'permission
signal for the auxiliary boiler') is determined by the outdoor
temperature (thermistor located at the outdoor unit). See "Field wiring
configuration B" on page 7.
Bivalent operation is only possible for space heating operation, not
for the domestic water heating operation. Domestic hot water in such
an application is always provided by the domestic hot water tank
which is connected to the Rotex indoor unit.
The auxiliary boiler must be integrated in the piping work and in the
field wiring according to the illustrations below.
CAUTION
■
Be sure that the boiler and the integration of the boiler
in the system is in accordance with relevant European
and national regulations.
■
Rotex can not be put responsible for incorrect or
unsafe situations in the boiler system.
1 2 3 4 5 8
M
7 16
10 11
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
(delivered with the
domestic hot water
tank)
10 Booster heater
18 17 6
15 17
FHL1
FHL2
FHL3
12
11 Heat exchanger coil
12 Domestic hot water tank
(optional)
15 Boiler (field supply)
16 Aquastat valve
(field supply)
17 Shut-off valve
(field supply)
18 Non-return valve
(field supply)
FHL1...3 Floor heating loop
(field supply)
Installation manual
6