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Danfoss District Energy
VI.GP.V2.02
DKDHR
Instructions
Akva Lux II VX2
Circulation pump, heating circuit
See chapter 13 on page 32 for more information about circulation
pump.
Safety thermostat
The heating circuit is supplied with a safety thermostat, type AT
pipe thermostat, for protection against overheating.
The AT pipe thermostat is used to regulate the medium tempera-
ture in the pipe, on which the thermostat is mounted. AT senses the
temperature in the pipe through its contact surface and is therefore
suitable to control the flow temperature, as it - in combination with
the ECL controller - switches of the pump to prevent excessive lev-
els of temperature.
Please see enclosed operating instructions
Thermostat type AT
Domestic hot water
The domestic hot water is prepared in a heat exchanger based on the
flow principle and the temperature is controlled by a combined hydraulic
and thermostatic self-acting controller PTC2+P with integrated differen-
tial pressure controller, which blocks the flow of primary and secondary
side flow through the heat exchanger immediately after completion of
the tapping process.
DHW temperature control
Danfoss PTC2+P controller (1) for DHW. The DHW temperature is adjusted
by turning the lever towards “+” (warmer) or “-” (colder).
Start by turning the handle
clockwise
- until stop /until the handle can
not be turned anymore. Then turn the handle
counter-clockwise
until
the temperature of the tap water is approx. 48° C at normal use (7-8 l/
min). The temperature should never exceed 55° C to avoid lime scale
precipitation.
Bypass thermostat
B
ypass thermostat (default).
As a standard the Akva Lux II VX2 is equipped with a bypass thermostat,
Danfoss FJVR (2), which ensures that hot water is produced immedi-
ately, when tapping starts. It is recommended to set the thermostat
in pos.3. If the water temperature rises too slowly it can be necessary
to set the thermostat at higher value.
Alternatively a DHW circulation system must be installed.
DHW recirculation
For Akva Lux II VX2
switching to recirculation is possible from a
constructional point of view, requiring only an additional circula-
tion set. The circulation set is not included in the delivery and must
be ordered separately and mounted on site.
See instructions for mounting of circulation set on page 14.
You must always fit a pump and a non-return valve to the recircula-
tion pipe, with flow direction towards the susbstation.
Handle for temperature setting
1
2
Approximate scale settings
2 = 30° C
3 = 40 °C
4 = 45° C
I = 50° C
(max. temperature)
Application
The AT pipe thermostat is used to regulate the
medium temperature in the pipe on which the
thermostat is mounted. AT senses the tempera-
ture in the pipe through its contact surface and is
therefore suitable to control boiler or flow tem-
perature in central heating systems.
The AT pipe thermostat comprises a bimetallaic
sensor, a contact system and a setting knob.
On connection to terminals CO and NC the ther-
mostat breaks on a rise in temperature.
On connection to terminals CO and NO the ther-
mostat close on a rise in temperature.
The AT thermostat can be mounted on the pipe
without emptying the plant of water.
Technical Data
Temperature range
30 to 90 °C
Temperature scale
external (type 041E0000)
internal (type 041E0020)
Temperature differential
8 K
Max. temperature plant surface
Ts90
Max. ambient temperature
55 °C
Storage temperature
-20 to 90 °C
Switch system
SPDT
Enclosure
IP40
Terminal CO-NC
Breaks on temperature rise
Terminal CO-NO
Closes on temperature rise
Switch load
6 (2.5) A, 250 Vac
0.1 A, 250 Vdc
Approval according to EMC Standard
EN 60730-2-9: 1995
EMC Standard
Emission EN 55014
Environment
Normal
Installation
Installed in any position
Accessories
Product
Code no.
Heat-conductive compound ~ 5 g
041E0110
Heat-conductive compound ~ 1 kg
041E0111
Data Sheet
Thermostat type AT
Danfoss Heating Solutions
VDGIA102
© Danfoss
01/2012
1
Remove
50 °C
Set temperature
80 °C
Note!
Temperature range for the safety thermostat is 30 - 90 °C.
The temperature is not preset from factory.
For floor heating the value must be set to max. 50 °C.
In case of radiator heating the value must be set to 80 °C.
