EKHBH/XE008BA
Indoor unit for air to water heat pump system
4PW56301-1A
Installation manual
25
[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] Booster heater operation and space heating off temperature
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
and
[6] 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 can 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
U
), 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.
If using a room thermostat, the disinfection function 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 on how to
de-activate space cooling/heating by schedule timer.
NOTE
It is therefore recommended to leave the auto restart
function enabled.
Before changing field settings for domestic water heating,
read attentively the warnings mentioned in the paragraph
.
The field setting [4-03]=2 or 3 is not relevant for this
system.
Before changing field settings for domestic water heating,
read attentively the warnings mentioned in the paragraph
"Domestic hot water tank (option)" on page 2
T
U
User set point temperature (as set on the user interface)
T
HP MAX
Maximum heat pump temperature at sensor in domestic hot
water tank (50°C)(depending on T
A
)
(a)
(a) 45°C = T
HP MAX
at T
A
>25°C.
50°C = T
HP MAX
at 5°C
≤
T
A
≤
25°C.
48°C = T
HP MAX
at T
A
<5°C.
T
HP OFF
Heat pump OFF temperature
T
HP ON
Heat pump ON temperature
The maximum domestic hot water temperature that can be
reached with the heat pump is 50°C. 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 or 2 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.
T
U
> T
HP MAX
T(
°
C)
70
T
U
50
T
HP MAX
48
T
HP OFF
41
T
HP ON
[6-01]
[6-00]
T
U
< T
HP MAX
T(
°
C)
45
T
U
= T
HP OFF
50
T
HP MAX
38
T
HP ON
[6-00]
T
U
= 45
°
C
[6-01] = 2
°
C
[6-00] = 7
°
C
T
U
= 70
°
C
[6-01] = 2
°
C
[6-00] = 7
°
C
