EKHBH/X008BA
Indoor unit for air to water heat pump system
4PW54185-1B
Installation manual
25
[4] Backup/booster heater operation and space heating off
temperature
Backup heater operation
The operation of the backup heater can altogether be enabled or
disabled, or it can be disabled depending on operation of the booster
heater.
■
[4-00] Status: defines whether backup heater operation is
enabled (1) or disabled (0).
■
[4-01] Priority: defines whether backup heater and booster
heater can operate simultaneously (0), or if the booster
heater operation has priority over the backup heater
operation (1), or if the backup heater operation has priority
over the booster heater operation (2).
Space heating off temperature
■
[4-02] Space heating off temperature: outdoor temperature
above which space heating is turned off, to avoid
overheating.
Booster heater operation
Applies only to installations with a domestic hot water tank.
The operation of the booster heater can be enabled or limited
depending on outdoor temperature (T
A
), domestic hot water
temperature (T
DHW
) or operation mode of the heat pump.
■
[4-03] Booster heater operation: defines whether the optional
booster heater operation is enabled (1) or has certain
limitations (0/2/3).
Explanation of settings of [4-03]
Booster heater will/can only operate if domestic hot water mode
is activated (
w
).
■
[4-03]=0, then booster heater operation is only allowed
during "[2] Disinfection function" and "Powerful domestic
water heating" (see operation manual).
This setting is only recommended in case the capacity of the
heat pump can cover the heating requirements of the house
and domestic hot water over the complete heating season.
The result of this setting is that the domestic hot water will
never be heated by the booster heater except for
"[2]
Disinfection function" and "Powerful domestic water
heating" (see operation manual).
■
[4-03]=1, then booster heater heater operation is only
determined by booster heater OFF temperature (T
BH OFF
),
booster heater ON temperature (T
BH ON
) and/or schedule
timer. Refer to setting
.
■
[4-03]=2, then booster heater operation is only allowed if heat
pump is out of "operation range" of heat pump domestic
water heating mode (T
A
<[5-03] or T
A
>35°C) or domestic hot
water temperature is 2°C lower then the heat pump OFF
temperature (T
HP OFF
) for domestic hot water mode
(T
DHW
>T
HP OFF
–2°C). (Refer to setting [5-03] on
,
[6-00] on
Results in the most optimum coverage of domestic hot water
heated by the pump.
■
[4-03]=3, then booster heater operation is the same as
setting 1, except that booster heater is OFF when the heat
pump is active in domestic hot water mode. The
consequence of this functionality is that setting [8-03] is not
relevant.
Results in optimum coverage of domestic hot water heated
by heat pump in relation with [8-04].
[5]
Equilibrium temperature and space heating priority
temperature
Equilibrium temperature — The 'equilibrium temperature' field
settings apply to operation of the backup heater.
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. When the function is disabled, operation of
the backup heater is possible at all outdoor temperatures. Enabling
this function reduces the working time of the backup heater.
■
[5-00] Equilibrium temperature status: specifies whether the
equilibrium temperature function is enabled (1) or
disabled (0).
■
[5-01] Equilibrium temperature: outdoor temperature below
which operation of the backup heater is allowed.
NOTE
When the priority field setting is set to
ON (1), space heating performance of the
system might be decreased at low outdoor
temperatures, since in case of domestic
water heating demand the backup heater will
not be available for space heating (space
heating will still be provided by the heat
pump).
When the priority field setting is set to
ON (2), domestic water heating performance
of the system might be decreased at low
outdoor temperatures, since in case of space
heating demand the booster heater will not
be available for domestic water heating.
However domestic water heating by heat
pump will still be available.
When the priority field setting is set to OFF
(0), make sure that electrical power
consumption does not exceed supply limits.
If the booster heater operation is limited ([4-03]=0)
and the ambient outdoor temperature
T
A
is lower than
the field setting to which parameter [5-03] is set and
[5-02]=1, then the domestic hot water will not be
heated.
The consequence of this setting is that the domestic
hot water temperature (T
DHW
) can be maximum the
heat pump OFF temperature (T
HP OFF
). Refer to
setting of [6-00] and [6-01] in
■
When setting [4-03]=1/2/3, the booster heater
operation can still be restricted by the schedule
timer as well. I.e., when booster heater operation
is preferred during certain period of the day. (See
operation manual)
■
When setting [4-03]=2, the booster heater will be
allowed to operate when T
A
<[5-03] independent
of the status of [5-02]. If bivalent operation is
enabled and permission signal for auxiliary boiler
is ON, the booster heater will be restricted even
when T
A
<[5-03]. (See
■
Booster heater is always allowed during powerful
and disinfection function, except for the period
that the backup heater operation is required for
safety reasons and [4-02]=1.
