RKHBH/X016AB
Indoor unit for air to water heat pump system
4PW50205-1A
Installation manual
21
[7] Domestic hot water step length
Applies only to installations with a domestic hot water tank.
When the domestic water is heated and the domestic hot water set
point temperature (as set by the user) has been reached, the booster
heater will continue to heat the domestic water to a temperature a
few degrees above the set point temperature, i.e. the booster heater
OFF temperature. These extra degrees are specified by the domestic
hot water step length field setting. Correct setting prevents the
booster heater from repeatedly turning on and off (i.e. chattering) to
maintain the domestic hot water set point temperature. Note: the
booster heater will turn back on when the domestic hot water
temperature drops 2°C (fixed value) below the booster heater OFF
temperature.
■
[7-00] Domestic hot water step length: temperature
difference above the domestic hot water set point
temperature before the booster heater is turned off.
[8] Domestic water heating mode timer
Applies only to installations with a domestic hot water tank.
The 'domestic water heating mode timer' field settings defines the
minimum and maximum domestic water heating times, and minimum
time between two domestic water heating cycli.
■
[8-00] Minimum running time: specifies the minimum time
period during which domestic water heating should be
activated, even when the target domestic water temperature
has already been reached.
■
[8-01] Maximum running time: specifies the maximum time
period during which domestic water heating can be activated,
even when the target domestic hot water temperature has
not yet been reached.
Note that when the unit is configured to work with a room
thermostat (refer to "Room thermostat installation
configuration" on page 15), the maximum running timer will
only be taken into account when there is a request for space
cooling or space heating. When there is no request for room
cooling or room heating, domestic water heating by the heat
pump will continue until the 'heat pump OFF temperature'
(see field settings [5]) is reached. When no room thermostat
is installed, the timer is always taken into account.
■
[8-02] Anti-recycling time: specifies the minimum required
interval between two domestic water heating cycli.
■
[8-03] Booster heater delay time: specifies the start-up time
delay of the booster heater operation after start of the heat
pump domestic water heating operation.
NOTE
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.
BH
Booster heater
HP
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
– 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
T
U
User set point temperature (as set on the user interface)
t
Time
NOTE
If the booster heater operation is limited
([4-03]=0), then set point of field setting parameter
[7-00] has no meaning.
t
T
BH ON
T
DHW
T
HP ON
T
HP OFF
T
HP MAX
T
U
T
BH OFF
[6-01]
[6-00]
[7-00]
T
U
= 70
°
C
[7-00] =
3
°
C
[6-01] =
7
°
C
[6-00] =
7
°
C
HP
BH
HP
0
10
20
30
40
41
48
55
60
71
70
73
1
Domestic water heating (1 = active, 0 = not active)
2
Hot water request (1 = request, 0 = no request)
t
Time
NOTE
If the outdoor temperature is higher than the field
setting to which parameter [4-02] is set, then field
settings of parameters [8-01] and [8-02] are not
considered.
1
Booster heater operation (1 = active, 0 = not active)
2
Heat pump domestic hot water operation (1 = request, 0 = no
request)
3
Hot water request (1 = request, 0 = no request)
t
Time
t
1
0
1
0
[8-01]
[8-02]
[8-00]
t
1
0
1
0
1
0
[8-03]
3
1D_IM_4PW50205-1A.book Page 21 Thursday, January 29, 2009 12:00 PM
