Installation manual
51
EKHBH/X008BB
Indoor unit for air to water heat pump system
4PW62570-1A – 01.2011
A
PPENDIX
(for restricted power supply condition mode only)
3.
I
NTRODUCTION
3.1.
General information
Heating/cooling units and heating only units
The unit range consists of two main versions: a heating/cooling
(EKHBX) version and a heating only (EKHBH) version.
Both versions are delivered with an integrated backup heater. The
backup heater only serves as a backup in case of malfunctioning of
the outdoor unit. In this application with restricted power supply
condition mode, the backup heater should be considered as
emergency backup heater.
1
Heat pump capacity
2
Required heating capacity (site dependent)
T
A
Ambient (outdoor) temperature
P
H
Heating capacity
Domestic hot water tank (option)
An optional domestic hot water tank can be connected to the indoor
unit. Only the tank with built-in electrical booster heater (EKHW*) in 3
different sizes: 150, 200 and 300 litre, can be connected to the indoor
unit.
Refer to the domestic hot water tank installation manual for further
details.
INFORMATION
All information and settings in the manual are applicable for
this system,
except
the information and settings
mentioned in this appendix.
NOTICE
Restricted power supply condition mode can only be used
for a tank with built-in electrical booster heater (EKHW*).
INFORMATION
■
At selection of the heat pump, the heat pump capacity
must match:
-
the required space heating capacity of the lowest
expected outdoor ambient temperature.
AND
-
the domestic hot water demand when installing the
optional domestic hot water tank.
■
The backup heater capacity and the optional booster
heater capacity are not supplementary to the heat
pump capacity. The total capacity of the system
equals the capacity of the heat pump and not the sum
of heat pump and backup heater capacity and the
optional booster heater capacity.
T
A
T
D
1
2
P
H
INFORMATION
Emergency backup heater operation always has
priority over compressor or booster heater operation.
Emergency backup heater operation occurs because of:
■
User request to heat up water to the space heating
loops. The temperature of this water is too low and is
out of the operation range (during initial start-up for
example). Refer to
"8.5. Initial start-up at low outdoor
ambient temperatures" on page 25
at low outdoor ambient temperatures" on page 53
■
During heating operation the water temperature
becomes too low and drops out of the operation
range. Refer to
"Checking the water volume and
expansion vessel pre-pressure" on page
minimize the backup heater operation.
■
Malfunction of the heat pump unit.
If during backup heater operation the heating load is higher
than the heater capacity, the water temperature can not
increase. In this case refer to
ambient temperatures" on page 53
INFORMATION
For installations with restricted power supply, the indoor
unit allow operation of backup heater only, booster heater
only or outdoor unit only.
Read attentively following information to understand the
unit operation.
INFORMATION
Balance between space heating/cooling demand and
domestic hot water demand
■
Domestic water heating by compressor becomes only
possible if the space heating/cooling requested set
point is reached.
To ensure domestic hot water production, the
schedule timers must be used to disable space
heating/cooling. Refer to the operation manual on how
to program the schedule timers.
■
Booster heater operation is only possible when the
compressor of the heat pump is not operating. The
compressor operates because of space heating/
cooling demand or because of domestic water
heating.
To ensure domestic hot water production, the
schedule timers must be used to disable space
heating/cooling. Refer to the operation manual on how
to program the schedule timers.
■
When using a room thermostat, domestic water
heating by compressor or by booster heater is
NOT
possible as long as the room thermostat demands
cooling or heating.
In this case de-activate the room thermostat demand
by its schedule timer.
Refer to the manual of the room thermostat for a
detailed explanation how to de-activate space
heating/cooling by schedule timer or refer to the
Appendix in the operation manual.
