E(D/B)(H/L)Q011~016BB
Unit for air to water heat pump system
4PW67904-1 – 01.2011
Installation manual
34
[3] Auto restart
When power returns after a power supply failure, the auto restart
function reapplies the user interface settings at the time of the power
supply failure.
Note that with the function disabled the schedule timer will not be
activated when power returns to the unit after a power supply failure.
Press the
pr
button to enable the schedule timer again.
■
[3-00] Status: defines whether the auto restart function is
turned ON (0) or OFF (1).
[4] Backup/booster heater operation and space heating off
temperature
Backup heater operation (only for EKHW* or applications
without tank installed)
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).
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
"[7-00]" on page 38
and
"[7-01]" on
page 38
.
■
[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 page 36
,
"[6-00]" on page 37
, and
"[6-01]" on page 37
).
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].
NOTICE
It is therefore recommended to leave the auto restart
function enabled.
NOTICE
If the benefit kWh rate power supply is of the type that
power supply is interrupted, then always allow the auto
restart function.
INFORMATION
Continuous unit control can be guaranteed independent of
the benefit kWh rate power supply status, by connecting
the unit to a normal kWh rate power supply. See
"Connection to a benefit kWh rate power supply" on
page 26
.
INFORMATION
Applicable for tank with built-in electrical booster heater
(EKHW*)
OR
when no optional domestic hot water tank connected to the
application (all information and limitation related to the
booster heater can be neglected).
INFORMATION
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.
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
"[6-00]" on page 37
and
"[6-01]" on page 37
.
