EKHBH/X008BB
Indoor unit for air to water heat pump system
4PW62570-1A – 01.2011
Installation manual
6
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
(1)
or backup
heater
(2)
.
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
temperature setting, the booster heater (
(3)
or backup heater (
(4)
can provide auxiliary heating.
Application 3
Space heating and cooling application with the
room thermostat set
for heating/cooling
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.
1
Outdoor unit
2
Indoor unit
3
Heat exchanger
4
Backup heater
(5)
5
Pump
6
Shut-off valve
7
Motorised 3-way valve (delivered with domestic hot water
tank)
8
Motorised 2-way valve (field supply)
9
Collector (field supply)
10
Domestic hot water tank (optional)
11
Booster heater
(6)
12
Heat exchanger coil
FCU1...3
Fan coil unit (optional)
FHL1...3
Floor heating loop
T
Room thermostat (optional)
Pump operation and space heating and cooling
According to the season, the customer will select heating or cooling
on the room thermostat (T). This selection is not possible by
operating the user interface.
When space heating/cooling is requested by the room thermostat
(T), the pump will start operating and the indoor unit (
) will switch to
"heating mode"/"cooling mode". The outdoor unit (
operating to achieve the target leaving hot/cold water temperature.
In case of cooling mode, the 2-way valve (
cold water running through the floor heating loops (FHL).
(1) Only applicable for tank with built-in electrical booster heater (EKHW*).
(2) Only applicable for tank without electrical booster heater (EKHTS).
(3) Only applicable for tank with built-in electrical booster heater (EKHW*).
(4) Only applicable for tank without electrical booster heater (EKHTS).
INFORMATION
Only for EKHW*:
■
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
to [5-04].
Only for EKHTS:
■
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
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.
(5) For tank without electrical booster heater (EKHTS), the backup heater will
be used in domestic water heating mode.
(6) Only applicable for tank with built-in electrical booster heater (EKHW*).
M
FCU1
FCU2
FCU3
9
M
FHL1
FHL2
FHL3
10
11 12
6
4
5
3
2
1
6
7
8
T
