86
HP
T
U
[7] DT for booster heater and dual set point control
DT for booster heater
WARNING
Applies only to installations with a domestic hot water tank.
Be aware that the domestic hot water temperature will be
automatically increased (always) with the value selected in
When the domestic hot water is heated and the domestic hot water
field setting [7-00] compare to the user set point for
set point temperature (as set by the user) has been reached, the
domestic hot water (T
U
). Refer to field setting [7-00] and
booster heater will continue to heat the domestic hot water to a
the operation manual to select preferable set point.
temperature a few degrees above the set point temperature, i.e. the
If this high water temperature can be a potential risk for
booster heater OFF temperature. These extra degrees are specified
human injuries, a mixing valve (field supply) shall be
by the domestic hot water step length field setting. Correct setting
installed at the hot water outlet connection of the domestic
prevents the booster heater from repeatedly turning on and off (i.e.
hot water tank. This mixing valve shall secure that the hot
chattering) to maintain the domestic hot water set point temperature.
water temperature at the hot water tap never rise above a
Note: the booster heater will turn back on when the domestic hot
set maximum value. This maximum allowable hot water
water temperature drops [7-
01] (field setting) below the booster
temperature shall be selected according to local laws and
heater OFF temperature.
regulations.
If the schedule timer for booster heater (see the operation
manual) is active, the booster heater will only operate if
allowed by this schedule timer.
If the booster heater operation is limited ([4-03]=0), then
set point of field setting parameter [7-00] has only meaning
for powerful domestic water heating.
■
[7-00] Domestic hot water step length: temperature
difference above the domestic hot water set point temperature before
■
[7-01] Hysteresis value booster heater: temperature
the booster heater is turned off.
difference determining the booster heater ON temperature
T
DHW
(°F)
(T
BH ON
). T
BH ON
= T
BH OFF
– [7-01]
T
BH OFF
163.4
T
BH ON
159.8
[7-00]
[7-01]
The minimum value for booster heater ON
temperature (T
BH ON
) is 3.6°F (2°C) (fixed) below heat
T
U
158
pump OFF temperature (T
HP OFF
).
140
T
HP MAX
122
T
HP OFF
118.4
T
HP ON
105.8
[6-01]
[6-00]
Dual set point control
Applies only to installations with different heat emitter which require
104
different set points.
Dual set point control makes it possible to generate 2 different set
points.
68
T
U
= 158°F
50
HP
BH
[7-00]
[6-01]
= 5.4°F
= 3.6°F
HP
NOTE
There is no indication available which set point is
active!
[6-00]
= 12.6°F
41
t
■
[7-
02] Dual set point control status: defines whether the dual
set point control is enabled (1) or disabled (0).
■
[7-
03] Second set point heating: specifies the second set
T
DHW
(°C)
point temperature in heating operation.
T
BH OFF
73
T
BH ON
71
[7-00]
[7-01]
■
[7-
04] Second set point cooling: specifies the second set
point temperature in cooling operation.
T
U
70
60
T
HP MAX
50
T
HP OFF
48
T
HP ON
41
[6-01]
[6-00]
40
30
20
T
U
= 70°C
10
HP
BH
[7-00]
[6-01]
= 3°C
= 2°C
HP
5
[6-00]
= 7°C
t
BH
Booster heater
Heat pump. If heating up time by the heat pump takes too
long, auxiliary heating by the booster heater can take place
T
BH OFF
Booster heater OFF temperature (T
U
+ [7-00])
T
BH ON
Booster heater ON temperature
((T
BH OFF
– 4°F) (T
BH OFF
– 2°C))
T
HP MAX
Maximum heat pump temperature at sensor in domestic hot
water tank
T
HP OFF
Heat pump OFF temperature (T
HP MAX
– [6-01])
T
HP ON
Heat pump ON temperature (T
HP OFF
– [6-00])
T
DHW
Domestic hot water temperature
User set point temperature (as set on the user interface)
t
Time
Installation manual
EDLQ036~054B EBLQ036~054BA6VJU1
30
Unit for air to water heat pump system
4PW56182-1
