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7 Application guidelines
▪ The room temperature of the main room is controlled by the user
interface used as thermostat.
▪ A thermostatic valve is installed before the underfloor heating in
each of the other rooms.
INFORMATION
Mind situations where the main room can be heated by
another heating source. Example: Fireplaces.
Configuration
Setting
Unit temperature control:
▪ #: [A.2.1.7]
▪ Code: [C-07]
Benefits
▪ Cost effective. You do NOT need an additional external room
thermostat.
▪ Easy. Same installation as for one room, but with thermostatic
valves.
Under floor heating or radiators – Multiple external
room thermostats
Setup
a
A
Main leaving water temperature zone
B
Room 1
C
Room 2
a
User interface
b
External room thermostat
c
Bypass valve
▪ For each room, a shut-off valve (field supplied) is installed to avoid
leaving water supply when there is no heating demand.
▪ A bypass valve must be installed to make water recirculation
possible when all shut-off valves are closed. To guarantee reliable
operation, provide a minimum water flow as described in table "To
check the water volume and flow rate" in
piping" on
page 26.
▪ The room thermostats are connected to the shut-off valves, and
do NOT have to be connected to the outdoor unit. The outdoor
unit will supply leaving water all the time, with the possibility to
program a leaving water schedule.
Configuration
Setting
Unit temperature control:
▪ #: [A.2.1.7]
▪ Code: [C-07]
Benefits
Compared with underfloor heating or radiators for one room:
▪ Comfort. You can set the desired room temperature, including
schedules, for each room via the room thermostats.
Installer reference guide
22
Value
2 (RT control): Unit operation is
decided based on the ambient
temperature of the user interface.
A
B
C
c
M1
M2
b
b
"8.3 Preparing water
Value
0 (LWT control): Unit operation
is decided based on the leaving
water temperature.
7.4
Setting up the domestic hot water
tank
Only applicable in case of NHY2KOMB28+32AA gas boiler.
7.4.1
System layout – Standalone DHW tank
See "Dedicated gas boiler + Domestic hot water via tank" in
"5.1.1 Dedicated gas boiler" on
page 11.
7.4.2
Selecting the volume and desired
temperature for the DHW tank
People experience water as hot when its temperature is 40°C.
Therefore, the DHW consumption is always expressed as equivalent
hot water volume at 40°C. However, you can set the DHW tank
temperature at a higher temperature (example: 53°C), which is then
mixed with cold water (example: 15°C).
Selecting the volume and desired temperature for the DHW tank
consists of:
1
Determining the DHW consumption (equivalent hot water
volume at 40°C).
2
Determining the volume and desired temperature for the DHW
tank.
Determining the DHW consumption
Answer the following questions and calculate the DHW consumption
(equivalent hot water volume at 40°C) using typical water volumes:
Question
How many showers are needed
per day?
How many baths are needed per
day?
How much water is needed at the
kitchen sink per day?
Are there any other domestic hot
water needs?
Example: If the DHW consumption of a family (4 persons) per day
is as follows:
▪ 3 showers
▪ 1 bath
▪ 3 sink volumes
Then the DHW consumption = (3×100 l)+(1×150 l)+(3×10 l)=480 l
Determining the volume and desired temperature for the DHW
tank
Formula
V
=V
+V
×(T
−40)/(40−T
)
1
2
2
2
1
V
=V
×(40−T
)/(T
−T
)
2
1
1
2
1
V
DHW consumption (equivalent hot water volume at 40°C)
1
V
Required DHW tank volume if only heated once
2
T
DHW tank temperature
2
T
Cold water temperature
1
Typical water volume
1 shower = 10 min×10 l/min =
100 l
1 bath = 150 l
1 sink = 2 min×5 l/min = 10 l
—
Example
If:
▪ V
=180 l
2
▪ T
=54°C
2
▪ T
=15°C
1
Then V
=280 l
1
If:
▪ V
=480 l
1
▪ T
=54°C
2
▪ T
=15°C
1
Then V
=307 l
2
EJHA04AAV3 + NHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P556861-1A – 2019.05
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