Danfoss AFT 06 Actuator for Temperature Control Installation Guide
- May 15, 2024
- Danfoss
Table of Contents
ENGINEERING TOMORROW
Operating Guide
AFT 06,17
AFT 06 Actuator for Temperature Control
Operating guide
Actuator for Temperature Control AFT 06, 17
www.danfoss.com
| | |
---|---|---|---
Type| VFG 21, 33, VFU 2| VFG 2| VFGS 2
–| ZF 6 ①| –| ZF 6 ②| –| ZF 4 ③
Tmax media| °C| 150| 150| 200| 200| 200| 300
Max. operating pressure| bar| 14| PN| 14| PN| 14| PN
PN| | | 16, 25, 40| | 16, 25, 40| | 16, 25, 40
| 
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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 thcontroller, 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 actuator AFT.. is used in combination with
Danfoss valves for temperature control of watewater-glycol mixtures, and steam
for heating, district heating, and cooling systems.
The technical data on the rating plates determine the use.
Permissible Pressures and Temperatures ❶
Mounting ❷
Permissible Installation Positions
- For valves VFG 2., VFG 3., VFU 2 DN 15-80 media temperatures up to120 °C
- For valves VFG 2., VFG 3., VFU 2 DN 100-125 and for DN 15-80, media temperatu res > 120 °C and for valves VFGS 2
Installation Scheme
Valves VFG 2(1), VFGS 2, VFU ❸
Can be installed in both flow or the return pip Mixing valve VFG 33 ❹
- Mixing valve in the supply flow heating
- Mixing valve in the supply flow cooling
Valve Installation ❺
-
Install strainer in front of valve.
-
Rinse system before installing valve.
-
Observe flow direction ① on the valve body.
**** Flanges② in the pipeline system must be in parallel direction, the sealing surfaces must be clean and undamaged. -
Install valve.
-
Tighten screws crosswise in 3 steps up to the maximum torque.
Actuator and Valve Mounting ❻
- Place actuator at the valve and align.
- Tighten union nut ①, torque 100 Nm
Temperature Sensor Installation ❼
- The temperature sensor may be installed in any position
- The capillary tube may not be twisted or buckled. The minimum bending radius is 50 mm.
- The temperature of the media has to be taken directly without any delay.
- Care for sufficient cross section of flow ②.
Filling the system and First Start-up ❽
When filling the system, the temperature control valve must be open.
Alternatively, the filling can be carried out from all sides.
To ensure that the temperature control valve is open, the following must be
observed:
The stem of the actuator: is extended ① if the temperature at the sensor ③ is
higher than the setpoint ④. is retracted ② if the temperature at the sensor ③
is lower than the setpoint ④.
In order to open the temperature control valvethe setpoint at the setpoint
adjuster ⑤ is to be increased or reduced, depending on the valve designs ⑥-⑧.
The pressure ② behind the valve may exceed the pressure ① in front of the
valve only insignificantly.
Non-compliance may cause damages at the valve.
Pressure test ➒
Carry out pressure tests only with the actuator mounted.
Without actuator, the valve is open ③, the seal is in the actuator.
It is absolutely necessary to constantly increase pressure from all
sides.
Non-compliance may cause damages at the controller.
Observe nominal pressure ④ of the valve.
Max. test pressure is 1.5 x PN
Setpoint Adjustment ❿
Thermostats are proportional controllers, thus certain deviation from set
point can be expected and varies from valve DN.
The setpoint range is indicated on the rating plate.
Adjustment
When the water temperature reaches the set temperature, VFG will be fully
closed, VFU will start opening.
- Observe temperature indicator ①.
- Adjust setpoint by turning the setpoint adjuster (observe the scale for relevant valve VFG2/VFU2) ②:
③ increases the setpoint
④ reduces the setpoint
If the temperature at the indicator ① is noticeably higher than the setpoint temperature, then:
– return setpoint adjuster only in increments of max. 10 °C and
– wait until the temperature at the sensor drops.
After having adjusted the setpoint, wait until the temperature indication ①
shows its final value.
** Scale on the setting knob is only the indication of the set temperature.
Temperature setting need to be done based on the temperature reading from the
thermometer.
Dismounting of Valve and Actuator ⓫
Danger of injury by steam or hot water!.
Valve without actuator is open ①, sealing ② is n the actuator.
It is absolutely necessary to depressurize system prior to dismounting.
Dimensions ⓬**
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brochures and other printed material. Danfoss reserves the right to alter its
products without notice. This also applies to products already on order
provided that such alterations can be made without subsequential changes being
necessary eady agreed.
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Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights
reserved.
****© Danfoss | DHS-SRMT/SI | 2017.07
73696090 / VI.GA.N6.81