Application 2 - Rotex RKHBH008BB3V3 Manuel D'installation

Application 2

Space heating only application without room thermostat connected to
the indoor unit. The temperature in each room is controlled by a valve
on each water circuit. Domestic hot water is provided through the
domestic hot water tank which is connected to the indoor unit.
1 2 3 4 5 6
6
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 Collector (field supply)
9 By-pass valve (field supply)
10 Domestic hot water tank (optional)
(2)
11 Booster heater
12 Heat exchanger coil
FHL1...3 Floor heating loop
T1...3 Individual room thermostat (optional)
M1...3 Individual motorised valve to control the floor heating loop
(field supply)
Pump operation
With no thermostat connected to the indoor unit (2), the pump (5) can
be configured to operate either as long as the indoor unit is on, or
until the required water temperature is reached.
INFORMATION
Details on pump configuration can be found under
"8.3. Pump operation configuration" on page 24.
Space heating
The outdoor unit (1) will operate to achieve the target leaving water
temperature as set on the user interface.
NOTICE
When circulation in each space heating loop (FHL1...3) is
controlled by remotely controlled valves (M1...3), it is
important to provide a by-pass valve (9) to avoid the flow
switch safety device from being activated.
The by-pass valve should be selected as such that at all
time the minimum water flow as mentioned under
"6.7. Water pipework" on page 14 is guaranteed.
It is recommended to select a pressure difference
controlled by-pass valve.
(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*).
Installation manual
5
7 8
T1 T2 T3
M
M1 M2 M3
FHL1
11 12
FHL2
FHL3
10
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
(4)
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 hot water by means of the heat pump. In case of large
domestic hot water demand or a high domestic hot water
9
temperature setting, the booster heater (11)
can provide auxiliary heating.
INFORMATION
Only for RKHW*:
■
At low outdoor temperatures when space heating
demand is higher, the indoor unit can be configured to
have the domestic hot water heated by the booster
heater exclusively. 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
"8.9. Field settings" on page 26, field settings [5-02]
to [5-04].
Only for RKHTS:
■
At low outdoor temperatures when space heating
demand is higher, the indoor unit can be configured to
have the domestic hot water heated the heat pump
and backup heater at the same time. This assures
that the interruption of space heating is limited to a
minimum.
■
Details on domestic hot water tank configuration for
low outdoor temperatures can be found under
"8.9. Field settings" on page 26, field settings [5-02]
to [5-04].
NOTICE
Be sure that the correct field settings are active or selected
according to the applicable tank type. See field settings in
"[4] Backup/booster heater operation and space heating
off temperature" on page 28 for more details.
(3) Only applicable for tank with built-in electrical booster heater (RKHW*).
(4) Only applicable for tank without electrical booster heater (RKHTS).
(5) Only applicable for tank with built-in electrical booster heater (RKHW*).
(6) Only applicable for tank without electrical booster heater (RKHTS).
(3)
or backup
(5)
or backup heater (4)
RKHBH/X008BB
Indoor unit for air to water heat pump system
4PW62574-1 – 10.2010
(6)