Installation manual
29
EKHBH/X008BB
Indoor unit for air to water heat pump system
4PW62570-1A – 01.2011
Booster heater operation (only for EKHW*)
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 (0/2/3/4).
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
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].
■
[4-03]=4, then booster heater operation is the same as
setting 2, except that the domestic water heating (heat pump
and booster) will operate according to the scheduled storage
and reheat function. See field settings
and
.
Backup heater operation (only for EKHTS)
The operation of the backup heater can altogether be enabled,
disabled, or limited.
■
[4-00] Status: defines whether backup heater operation is
disabled (0), enabled (1) or limited (2).
When [4-00]=2, the backup heater is only allowed during
domestic water heating mode.
NOTICE
When the priority field setting is set to OFF (0),
make sure that electrical power consumption does
not exceed supply limits.
INFORMATION
Applicable for tank with built-in electrical booster heater
(EKHW*)
INFORMATION
If the booster heater operation is limited ([4-03]=0)
and the ambient 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
INFORMATION
■
When setting [4-03]=1/2/3/4, 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.
CAUTION
For optional domestic hot water tank, the field
setting [4-03] shall be 0, 1, 2, 3, or 4.
In case [4-03]=5, there is an incorrect field wiring
between tank and indoor unit. The required
corrective action is described in
[4-03] and maximum tank set point is not
according to the applicable tank" on page 47
INFORMATION
[4-03]=3 (default), this setting is automatically
selected if the correct and complete wiring
connections between indoor unit and switch box
(a)
of the optional domestic hot water tank are done
BEFORE SS2-2 is set to ON. [4-03]=0~4 activate
the applicable logic and field settings for EKHW*.
(a) Only applicable for tank with built-in electrical booster heater
(EKHW*).
INFORMATION
For tank without electrical booster heater (EKHTS), the
backup heater will be used in domestic water heating
mode.
INFORMATION
■
In special conditions, for example the outdoor
cannot work due to malfunction, the backup
heater will also be allowed to operate during
space heating.
■
If the backup heater operation is disabled
([4-00]=0), the domestic water will not be
heated.
