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Installation manual

EKHBH/X008BB

Indoor unit for air to water heat pump system

4PW62570-1A – 01.2011

Equilibrium temperature (only for EKHTS)

The 'equilibrium temperature' field settings apply to operation of the

backup heater

during space heating.

When the equilibrium temperature function is enabled, operation of
the backup heater is restricted to low outdoor temperatures, i.e. when
the outdoor temperature equals or drops below the specified
equilibrium temperature. This function reduces the working time of
the backup heater.

■

[5-00] Equilibrium temperature status: the equilibrium
temperature function is enabled (1) (this field setting is fixed
and can not be modified).

■

[5-01] Equilibrium temperature: outdoor temperature below
which operation of the backup heater is allowed.

Space heating priority temperature (only for EKHTS)

Applies only to installations with a domestic hot water tank

(1)

. The

domestic water is heated by heat pump and backup heater. The
'space heating priority temperature' field settings apply to operation
of the 3-way valve and the

backup heater

during domestic hot water

operation.
When the space heating priority function is enabled, it is assured that
the full capacity of the heat pump is used as much as possible for
space heating when the outdoor temperature equals or drops below
the specified space heating priority temperature, i.e. low outdoor
temperature. This is done by allowing the backup heater to assist
during domestic hot water heating. This means the heating up time of
domestic water heating will be kept to a minimum and as much as
possible capacity of the heat pump is used for space heating.

■

[5-02] Space heating priority temperature: outdoor
temperature below which the domestic water heat up time is
reduced to a minimum, as the backup heater will additionally
assist during low domestic hot water tank temperature
situations (this field setting is fixed and can not be modified).

■

[5-03] Space heating priority temperature: outdoor
temperature below which the backup heater is allowed to
assist during domestic hot water heating. This means the
heating up time of domestic water heating will be kept to a
minimum and as much as possible capacity of the heat pump
is used for space heating.

[6] DT for heat pump domestic water heating mode/scheduled
storage and reheat domestic water heating

DT for heat pump domestic water heating mode

Applies only to installations with a domestic hot water tank.

The 'DT (temperature difference) for heat pump domestic water
heating mode' field settings determine the temperatures at which
heating of the domestic hot water by the heat pump will be started
(i.e., the heat pump ON temperature) and stopped (i.e., the heat
pump OFF temperature).
When the domestic hot water temperature drops below the heat
pump ON temperature (T

HP ON

), heating of the domestic hot water by

the heat pump will be started. As soon as the domestic hot water
temperature reaches the heat pump OFF temperature (T

HP OFF

) or

the user set point temperature (T

), heating of the domestic hot

water by the heat pump will be stopped (by switching the 3-way
valve).

The heat pump OFF temperature, and the heat pump ON
temperature, and its relation with field settings [6-00] and [6-01] are
explained in the illustration below.

■

[6-00] Start: temperature difference determining the heat
pump ON temperature (T

HP ON

). See illustration.

■

[6-01] Stop: temperature difference determining the heat
pump OFF temperature (T

HP OFF

). See illustration.

User set point temperature (as set on the user interface)

HP MAX

Maximum heat pump temperature at sensor in domestic
hot water tank (50°C)(depending on T

)

(2)

HP OFF

Heat pump OFF temperature

HP ON

Heat pump ON temperature

Scheduled storage domestic water heating

(3)(4)

The storage set point can be accessed directly using the

and

buttons.

■

[6-03] Scheduled storage: defines whether the scheduled
domestic water heating storage during night is enabled (1) or
not (0).

■

[6-04] Scheduled storage start time: time of the night at
which the domestic water should be heated.

WARNING

Be aware that the domestic hot water temperature will be
automatically increased with the value selected in field
setting [5-04] (if the outdoor temperature drops below field
setting [5-03]) compare to the user set point for domestic
hot water (T

). Refer to field setting [5-03], [7-00] and the

operation manual to select preferable set point.

If this high domestic hot water temperature can be a
potential risk for human injuries, a mixing valve (field
supply) shall be installed at the hot water outlet connection
of the domestic hot water tank. This mixing valve shall
secure that the hot water temperature at the hot water tap
never rise above a set maximum value. This maximum
allowable hot water temperature shall be selected
according to the applicable legislation.

(1) Only applicable for tank without electrical booster heater (EKHTS).

NOTICE

[5-01] Equilibrium temperature and [5-03] Space
heating priority temperature are field settings that are
related to backup heater. So it is obliged to set [5-01]
and [5-03] to the same setting value.

INFORMATION

If the backup heater operation is limited ([4-00]=0) and
the ambient temperature T

is lower than the field

setting to which parameter [5-03] is set, then the
domestic hot water will not be heated with the backup
heater.

(2) Depending on outdoor unit and tank selection. See operation range domestic hot

water for more details.

INFORMATION

The maximum domestic hot water temperature that can be
reached with the heat pump is 50°C

(a)

. It is advised to

select T

HP OFF

not higher than 48°C in order to improve

performance of the heat pump during domestic water
heating mode.

When setting [4-03]=0, 2, 4, or 5 special attention to setting
[6-00] is recommended. A good balance between the
required domestic hot water temperature and heat pump
ON temperature (T

HP ON

) is a must.

(a) Depending on outdoor unit and tank selection. See operation range domestic hot

water for more details.

(3) When the unit is configured for restricted power supply condition mode,

see

"Appendix" on page 51

(4) The scheduled storage/reheat domestic water heating is only applicable in

case [4-03]=4 or 5.

> T

HP MAX