Danfoss QTL Thermostatic Actuator User Guide
- October 27, 2023
- Danfoss
Table of Contents
Danfoss QTL Thermostatic Actuator
Assembly ❶
Insert adapter ① into thermostat neck
Design ❷
Mount AB-QM valve ③ on hot-water pipe (see instruction for AB-QM)
① Setting knob
② Adapter
③ AB-QM valve
④ Hot-water pipe
⑤ Temperature sensor
Set desired setting on AB-QM (see instruction for AB-QM)
Mounting ❸
QT/QTL should be mounted on the AB-QM by hand. Maximum allowed torque is 5 Nm.
Sensor installation ❹
AB-QM is to be installed on the return pipe. In general the sensor must always
be placed warmer than the thermostat head. In case of one-pipe system the AB-
QM needs to be installed after and as close as possible to the last radiator.
QT should be mounted on the AB-QM by hand. Maximum allowed torque is 5 Nm. For
proper heat transfer between a heating water pipe and the thermostat sensor,
it is very important to apply thermo paste (included in the box) on the
surfaces in contact. It is recommended to insulate the sensor if the
thermostat is installed in a very cold place (< 5 °C).
Sensor itself can be mounted in any direction. It can be mounted above or
below sensor head.
Setting ❺
QT/QTL temperature setting depends on AB-QM flow setting It is necessary to set the AB-QM to desired setting before the thermostat is mounted. It is recommended to set AB-QM between 30 and 70 % flow setting. QT/QTL thermostat is set to the desired setting by hand. When minimum or maximum setting is required, QT/QTL setting knob is to be moved slightly in opposite direction to ensure optimal performance of the thermostat.
Please note that the attached tables are indicative and will vary depending on the application. They are to be used as a guidance only. For exact temperature verification tempera ture needs to be measured at reference point and the sensor setting adjusted accordingly.
AB‑QM DN 10-20 (35-50 °C)
| Temp. setting (°C) | QT Sensor setting (turns) |
|---|---|
| 0 | 1 |
| AB-QM (flow setting) | 20 % |
| 30 % | 37.0 |
| 40 % | 36.0 |
| 50 % | 35.0 |
| 60 % | 34.0 |
| 70 % | 33.0 |
| 80 % | 32.0 |
| 90 % | 31.0 |
| 100 % | 30.0 |
Factory setting of the thermostat is 4.
AB‑QM DN 10-20 (45-60 °C)
| Temp. setting (°C) | QT Sensor setting (turns) |
|---|---|
| 0 | 1 |
| AB-QM (flow setting) | 20 % |
| 30 % | 47.0 |
| 40 % | 46.0 |
| 50 % | 45.0 |
| 60 % | 44.0 |
| 70 % | 43.0 |
| 80 % | 42.0 |
| 90 % | 41.0 |
| 100 % | 40.0 |
Factory setting of the thermostat is 4.
AB‑QM DN 10-20 (65-85 °C)
| Temp. setting (°C) | QT Sensor setting (turns) |
|---|---|
| 0 | 1 |
| AB-QM (flow setting) | 20 % |
| 30 % | 67.0 |
| 40 % | 66.0 |
| 50 % | 65.0 |
| 60 % | 63.5 |
| 70 % | 62.0 |
| 80 % | 60.5 |
| 90 % | 58.5 |
| 100 % | 57.0 |
Factory setting of the thermostat is 4.
AB‑QM DN 25-32 (35-50 °C)
| Temp. setting (°C) | QT Sensor setting (turns) |
|---|---|
| 0 | 1 |
| AB-QM (flow setting) | 20 % |
| 30 % | 38.0 |
| 40 % | 36.5 |
| 50 % | 35.0 |
| 60 % | 33.5 |
| 70 % | 32.0 |
| 80 % | 30.5 |
| 90 % | 29.0 |
| 100 % | 27.5 |
Factory setting of the thermostat is 4.
AB‑QM DN 25-32 (45-60 °C)
| Temp. setting (°C) | QT Sensor setting (turns) |
|---|---|
| 0 | 1 |
| AB-QM (flow setting) | 20 % |
| 30 % | 48.0 |
| 40 % | 46.5 |
| 50 % | 45.0 |
| 60 % | 43.5 |
| 70 % | 42.0 |
| 80 % | 40.5 |
| 90 % | 39.0 |
| 100 % | 37.5 |
Factory setting of the thermostat is 4.
AB‑QM DN 25-32 (65-85 °C)
| Temp. setting (°C) | QT Sensor setting (turns) |
|---|---|
| 0 | 1 |
| AB-QM (flow setting) | 20 % |
| 30 % | 70.0 |
| 40 % | 67.5 |
| 50 % | 65.0 |
| 60 % | 62.5 |
| 70 % | 60.0 |
| 80 % | 58.0 |
| 90 % | 56.5 |
| 100 % | 55.0 |
Factory setting of the thermostat is 4.
Documents / Resources
|
Danfoss QTL Thermostatic
Actuator
[pdf] User Guide
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