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VI.GC.W3.8N

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

❷

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.

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

➍

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).

Caution

Mechanical loads of the valve body by the
pipelines are not permitted

⑧

Mounting of temperature actuator

❺

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.

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

❽

1. Slowly open shut-off devices in the flow

pipeline

①

2. Slowly open shut-off devices

②

in the return

pipeline.

Leak and Pressure Tests

Pressure must be gradually increased at
the +/- side of the valve . Do not test with

closed valve.

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

1. Slowly close shut-off devices

①

in the flow

pipeline.

2. Slowly close shut-off devices

②

in the return

pipeline.

Settings