Application 5 - Rotex RKHBH008BB3V3 Manuel D'installation

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 (7) 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 (7) is closed to prevent
cold water running through the floor heating loops (FHL).
NOTICE
■
When closing several loops in the system by remotely
controlled valves, it might be required to install a by-
pass valve (10) to avoid the flow switch safety device
from being activated. See also "Application 2" on
page 5.
■
Wiring of the 2-way valve (7) 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.

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 8.
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 the applicable
legislation.
■
Rotex can not be put responsible for incorrect or
unsafe situations in the boiler system.
Installation manual
7
1 2 3 4 5 6
6
12
14 15
1 Outdoor unit
2 Indoor unit
3 Heat exchanger
(1)
4 Backup heater
5 Pump
6 Shut-off valve
7 Motorised 3-way valve (field supply)
8 Non-return valve (field supply)
9 Shut-off valve (field supply)
10 Collector (field supply)
11 Boiler (field supply)
12 Aquastat valve (field supply)
13 Domestic hot water tank (optional)
(2)
14 Booster heater
15 Heat exchanger coil
FHL1...3 Floor heating loop
Field wiring configuration A
L
H Com
RKHB*/auto / Boiler
A
K1A K2A
N
B Boiler thermostat input
TI
A Auxiliary contact (normal closed)
H Heating demand room thermostat (optional)
K1A Auxiliary relay for activation of RKHB* unit (field supply)
K2A Auxiliary relay for activation of boiler (field supply)
(1) For tank without electrical booster heater (RKHTS), the backup heater will
be used in domestic water heating mode.
(2) Only applicable for tank with built-in electrical booster heater (RKHW*).
Indoor unit for air to water heat pump system
7 8 10
M
8
9
11
9
FHL1
FHL2
FHL3
13
RKHB*
B TI
X2M
1 2 3 4 X Y
K1A K2A
RKHBH/X008BB
4PW62574-1 – 10.2010