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AVT
ENGLISH
Safety Notes
Prior to assembly and commissioning to
avoid injury of persons and damages of
the devices, it is absolutely necessary to
carefully read and observe these instructions.
Necessary assembly, start-up, and maintenance
work must be performed only by qualified,
trained and authorized personnel.
Prior to assembly and maintenance work on the
controller, the system must be:
-
depressurized,
-
cooled down,
-
emptied and
-
cleaned.
Please comply with the instructions of the
system manufacturer or system operator.
Disposal instruction
This product should be dismantled and its
components sorted, if possible, in various
groups before recycling or disposal.
Always follow the local disposal regulations.
Definition of Application
The temperature actuator AVT is, in
combination with Danfoss valves and Danfoss
controller combinations, used for temperature
control of water and water glycol mixtures for
heating, district heating and cooling systems.
The temperature controllers (temperature
actuators with valves) with the temperature
actuator AVT are type-tested acc. to EN 14597
and comply with the safety requirements for
temperature control and temperature limiting
units in heat systems.
The technical parameters on the product labels
determine the use.
Application examples
➊
Temperature actuator AVT can be combined
with:
① VG(F), VGU(F) and VGS valves.
② Combination pieces K2, K3 and valves
mentioned above.
③ Flow and temperature controller AVQT
and Flow and temperature controller with
integrated control valve AVQMT.
④ Differential pressure and temperature
controller with flow limitation (and fixed
setting) AVPBT(-F).
⑤ Differential pressure, flow and temperature
controller AVPQT.
Assembly
Admissible Installation Positions
Temperature actuator with valves
-
In combination with VG(F) or VGU(F) valves:
• Can be installed in any position ①.
-
In combination with VGS valves:
• Medium temperatures up to 160 °C:
Can be installed in any position ②.
• Medium temperatures > 160 °C:
Can be installed horizontal and in
horizontal pipelines with the actuator
oriented downwards ③.
Admissible installation positions in
combination with AVQT, AVQMT,
AVPBT(-F) and AVPQT - see relevant instructions.
VI.GC.W3.8N
Temperature sensor
-
The capillary tube may not be twisted or
buckled. The minimum bending radius is
50 mm ④.
-
The place of installation must be chosen in
a way that the temperature of the medium
is directly taken without any delay. Avoid
overheating of temperature sensor
-
The temperature sensor must be immersed
into the medium in its full length.
Temperature sensors 170 mm R½" and
210 mm R¾":
-
The temperature sensor may be installed in
any position ⑤.
Temperature sensor 255 mm R¾":
-
The temperature sensor must be installed as
shown on the picture ⑥.
Installation Location and Installation
Scheme
➌
•
AVT/valve ①, AVT/AVT/valve ② return
mounting
•
AVT/valve ③, AVT/AVT/valve ④ flow
mounting
Valve Installation
1. Clean pipeline system prior to assembly.
2. The installation of a strainer in front of the
controller is strongly recommended ①.
3. Install temperature indicators in the system
part to be controlled.
4. Install valve
• The flow direction indicated on the
product label ② or on the valve ③ must be
observed.
• The valve with mounted weld-on
tailpieces may only be spot welded to the
pipeline ④.
The weld-on tailpieces may be welded only
without the valve and seals! ⑤⑥
If these instructions are not observed, high
welding temperatures may destroy the
seals.
• Flanges ⑦ in the pipeline must be in
parallel position and sealing surfaces must
be clean and without any damage.
Tighten screws in flanges crosswise in 3
steps up to the maximum torque (50 Nm).
5. Caution:
Mechanical loads of the valve body by the
pipelines are not permitted ⑧.
Mounting of temperature actuator
Before mounting the actuator, carry out Filling
the system, First start-up and Leak and pressure
tests, see ❽.
Place temperature actuator AVT at the valve ②
or combination piece ③ and tighten union nut
with wrench SW 50. Torque 35 Nm.
❷
Insulation
❻
Do not insulate the temperature actuator and
the valve as well.
Start-up
❼
Valves VG, VGF and VGS ① are normally
opened (NO) valves.
Filling the system and Leak and pressure test
should be done without mounted temperature
actuator ② - valve has to be open.
Valves VGU and VGUF ③ are normally
closed (NC) valves.
Filling the system and Leak and pressure test
should be done with open valve. Temperature
actuator ④ could be mounted and set in a way
that the valve is open.
Filling the system, first start-up
1. Slowly open shut-off devices in the flow
2. Slowly open shut-off devices ② in the return
Leak and Pressure Tests
Non-compliance may cause damages at the
actuator or the valve.
A pressure test of the entire system must be
carried out in accordance with manufacturer's
instructions.
The maximum test pressure for the valves is:
1.5 × PN
PN - see product label!
Putting out of operation
➍
1. Slowly close shut-off devices ① in the flow
2. Slowly close shut-off devices ② in the return
Settings
Temperature Setting
The temperature setting range is indicated on
product label ①.
Pre-conditions:
The system must be opened and the flow of the
medium guaranteed.
Procedure:
•
•
•
•
❺
•
Adjustment diagram
Temperature setting
Relation between scale numbers 1-5 and closing
temperature.
Dimensions, Weights
1)
2)
pipeline ①.
pipeline.
Pressure must be gradually increased at
the +/- side of the valve . Do not test with
closed valve.
pipeline.
pipeline.
❾
Set desired setpoint by turning the setting
adjuster ②.
- Turning to the left (counter-clockwise)
increases the setpoint.
- Turning to the right (clockwise) reduces the
setpoint.
The position of the setpoint adjuster on a
scale value ③ means:
1 minimum setpoint
5 maximum setpoint
Observe temperature indicator ⑤.
Wait for about 3 to 5 min. until the
temperature indicator shows the final value.
If the device is used as a temperature
monitor, the setting adjuster ② must be
sealed by a sealing wire ④.
❿
The values given are approximate
⓫
Conical ext. thread acc. to EN 10226-1
Flanges PN 25, acc. to EN 1092-2
© Danfoss | 2017.08 | 5
❽
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