Installation manual
37
E(D/B)(H/L)Q011~016BB
Unit for air to water heat pump system
4PW67904-1 – 01.2011
[6] DT for heat pump domestic water heating mode/scheduled
storage and reheat domestic water heating
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 will 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.
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
)
(1)
T
HP OFF
Heat pump OFF temperature
T
HP ON
Heat pump ON temperature
Scheduled storage domestic water heating
(2)
The storage set point can be accessed directly using the
wi
and
wj
buttons.
■
[6-03] Scheduled storage: defines whether the scheduled
domestic water heating storage during night is enabled (1) or
not (0).
■
[6-04] Scheduled storage start time: time of the night at
which the domestic water should be heated.
Scheduled reheat domestic water heating
(3)
■
[6-05]
Reheat: defines whether the scheduled domestic
water reheat during daytime is enabled (1) or continuous
reheat is enabled (2) or reheat is disabled (0)
■
[6-06] Scheduled reheat start time: time of the day at which
the domestic water should be heated.
■
[6-07] Domestic hot water reheat set point
■
[6-08] Domestic hot water reheat set point hysteresis
Example 1: Scheduled storage [6-03]=1, scheduled reheat [6-05]=1,
disinfection function [2-01]=1 activated.
A Scheduled storage operation: activated at [6-04], heat
up domestic hot water untill domestic hot water user
interface set point T
DHW
(e.g 55°C) is reached.
B Scheduled reheat operation: activated at [6-06], heat up
domestic hot water untill domestic hot water reheat set
point [6-07] (e.g 45°C ) is reached.
C Disinfection operation (if activated): activated at [2-02],
heat up domestic hot water untill domestic hot water
disinfection set point [2-03] (e.g 60°C) is reached. Refer to
"[2] Disinfection function" on page 33
.
t Time
T Domestic hot water temperature
T
DHW
Domestic hot water user interface set point
Example 2: Scheduled storage [6-03]=1, continuous reheat [6-05]=2,
disinfection function [2-01]=1 activated.
A Scheduled storage operation: activated at [6-04], heat
up domestic hot water untill domestic hot water user
interface set point T
DHW
(e.g 55°C) is reached.
B Continuous reheat operation: continues activated heat
up domestic water till domestic hot water reheat set point
[6-07] (e.g 45°C) is reached with a hysteresis of [6-08].
C Disinfection operation (if activated): activated at [2-02],
heat up domestic hot water untill domestic hot water
disinfection set point [2-03] (e.g 60°C) is reached. Refer to
"[2] Disinfection function" on page 33
.
t Time
T Domestic hot water temperature
T
DHW
Domestic hot water user interface set point
(1) Depending on unit and tank selection. See operation range domestic hot water
for more details.
INFORMATION
The maximum domestic hot water temperature that can be
reached with the heat pump is 50°C
(a)
. 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, 2, 4, or 5 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.
(a) Depending on unit and tank selection. See operation range domestic hot water
for more details.
(2) The scheduled storage/reheat domestic water heating is only applicable in
case [4-03]=4 or 5.
T
U
> T
HP MAX
T(
°
C)
60
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
(3) The scheduled storage/reheat domestic water heating is only applicable in
case [4-03]=4 or 5.
A
B
C
T
t
[2-03]
T
DHW
[6-07]
[6-04]
[6-06]
[2-02]
A
B
C
[6-08]
B
T
t
[2-03]
[6-07]
T
DHW
[6-04]
[2-02]
