Danfoss QT, QTL Thermostatic Actuator

Specifications

• Product Name: Thermostatic Actuator QT / QTL
• Model Number: 73693940
• Compatible with: AB-QM (DN 10-32) for QT and AB-QM (DN 10-20) for QTL

Product Usage Instructions

Assembly:
Insert the adapter into the thermostat neck.

Design:

1. Mount the AB-QM valve on the hot-water pipe as per the AB-QM instructions.
2. Set the desired setting on AB-QM.

Mounting:
QT/QTL should be mounted on the AB-QM by hand with a maximum allowed torque of 5 Nm.

Sensor Installation:

1. Install the AB-QM on the return pipe.
2. Place the sensor warmer than the thermostat head.

Setting:

• Set the AB-QM to the desired setting before mounting the thermostat.
• Adjust the QT/QTL thermostat setting knob as needed for optimal performance.

Important Notes:

• Apply thermo paste (included in the box) for proper heat transfer between the heating water pipe and the thermostat sensor.
• The sensor can be mounted in any direction.
• Refer to the tables provided in the manual for sensor settings based on AB-QM flow settings.

Thermostatic actuator QT / QTL

Assembly

Insert adapter ① into the thermostat neck

Design

Mount AB-QM valve ③ on the 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 the desired setting on AB-QM (see instructions for AB-QM)

Mounting

QT/QTL should be mounted on the AB-QM by hand. The maximum allowed torque is 5 Nm.

Sensor installation

• 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 a 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. The 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 thermal 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).
• The sensor itself can be mounted in any direction. It can be mounted above or below the sensor head.

Setting

• QT/QTL temperature setting depends on AB-QM flow setting.
• It is necessary to set the AB-QM to the desired setting before the thermostat is mounted. It is recommended to set AB-QM between 30 and 70 % flow setting.
• The 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 guidance only. For exact temperature verification tempera temperature needs to be measured at the 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	2	3	4	5	6
AB-QM (flow setting)	20 %	38.0	40.5	43.0	45.5	48.0	50.5	53.0
	30 %	37.0	39.5	42.0	44.5	47.0	49.5	52.0
	40 %	36.0	38.5	41.0	43.5	46.0	48.5	51.0
	50 %	35.0	37.5	40.0	42.5	45.0	47.5	50.0
	60 %	34.0	36.5	39.0	41.5	44.0	46.5	49.0
	70 %	33.0	35.5	38.0	40.5	43.0	45.5	48.0
	80 %	32.0	34.5	37.0	39.5	42.0	44.5	47.0
	90 %	31.0	33.5	36.0	38.5	41.0	43.5	46.0
	100 %	30.0	32.5	35.0	37.5	40.0	42.5	45.0

The factory setting of the thermostat is 4.

AB‑QM DN 10‑20 (45‑60 °C)

Temp. setting (°C)		QT Sensor setting (turns)
		0	1	2	3	4	5	6
AB-QM (flow setting)	20 %	48.0	50.5	53.0	55.5	58.0	60.5	63.0
	30 %	47.0	49.5	52.0	54.5	57.0	59.5	62.0
	40 %	46.0	48.5	51.0	53.5	56.0	58.5	61.0
	50 %	45.0	47.5	50.0	52.5	55.0	57.5	60.0
	60 %	44.0	46.5	49.0	51.5	54.0	56.5	59.0
	70 %	43.0	45.5	48.0	50.5	53.0	55.5	58.0
	80 %	42.0	44.5	47.0	49.5	52.0	54.5	57.0
	90 %	41.0	43.5	46.0	48.5	51.0	53.5	56.0
	100 %	40.0	42.5	45.0	47.5	50.0	52.5	55.0

The factory setting of the thermostat is 4.

AB‑QM DN 10‑20 (65‑85 °C)

Temp. setting (°C)		QT Sensor setting (turns)
		0	1	2	3	4	5	6
AB-QM (flow setting)	20 %	68.5	71.0	73.5	76.5	80.0	83.5	87.5
	30 %	67.0	70.0	72.5	76.0	79.0	82.5	86.5
	40 %	66.0	69.0	71.5	75.0	78.5	81.5	85.5
	50 %	65.0	68.0	71.0	74.5	77.5	81.0	85.0
	60 %	63.5	67.0	70.5	74.0	76.5	80.0	84.0
	70 %	62.0	65.5	69.0	72.5	75.5	79.0	83.5
	80 %	60.5	64.0	67.5	71.0	74.5	78.0	83.0
	90 %	58.5	62.5	66.0	69.5	73.5	77.5	82.0
	100 %	57.0	61.0	64.5	68.0	72.5	77.0	81.5

The factory setting of the thermostat is 4.

AB‑QM DN 25‑32 (35‑50 °C)

Temp. setting (°C)		QT Sensor setting (turns)
		0	1	2	3	4	5	6
AB-QM (flow setting)	20 %	39.5	42.0	44.5	47.0	49.5	52.0	54.5
	30 %	38.0	40.5	43.0	45.5	48.0	50.5	53.0
	40 %	36.5	39.0	41.5	44.0	46.5	49.0	51.5
	50 %	35.0	37.5	40.0	42.5	45.0	47.5	50.0
	60 %	33.5	36.0	38.5	41.0	43.5	46.0	48.5
	70 %	32.0	34.5	37.0	39.5	42.0	44.5	47.0
	80 %	30.5	33.0	35.5	38.0	40.5	43.0	45.5
	90 %	29.0	31.5	34.0	36.5	39.0	41.5	44.0
	100 %	27.5	30.0	32.5	35.0	37.5	40.0	42.5

The factory setting of the thermostat is 4.

AB‑QM DN 25‑32 (45‑60 °C)

Temp. setting (°C)		QT Sensor setting (turns)
		0	1	2	3	4	5	6
AB-QM (flow setting)	20 %	49.5	52.0	54.5	57.0	59.5	62.0	64.5
	30 %	48.0	50.5	53.0	55.5	58.0	60.5	63.0
	40 %	46.5	49.0	51.5	54.0	56.5	59.0	61.5
	50 %	45.0	47.5	50.0	52.5	55.0	57.5	60.0
	60 %	43.5	46.0	48.5	51.0	53.5	56.0	58.5
	70 %	42.0	44.5	47.0	49.5	52.0	54.5	57.0
	80 %	40.5	43.0	45.5	48.0	50.5	53.0	55.5
	90 %	39.0	41.5	44.0	46.5	49.0	51.5	54.0
	100 %	37.5	40.0	42.5	45.0	47.5	50.0	52.5

The factory setting of the thermostat is 4.

AB‑QM DN 25‑32 (65‑85 °C)

Temp. setting (°C)		QT Sensor setting (turns)
		0	1	2	3	4	5	6
AB-QM (flow setting)	20 %	72.5	75.0	77.5	80.0	84.0	88.0	92.5
	30 %	70.0	73.0	75.5	78.0	82.0	86.0	90.5
	40 %	67.5	70.5	73.3	76.0	80.0	83.5	87.0
	50 %	65.0	68.0	72.0	74.0	77.5	80.5	85.0
	60 %	62.5	65.8	69.2	72.5	76.5	79.0	84.0
	70 %	60.0	64.5	68.5	71.5	75.5	78.0	83.0
	80 %	58.0	63.0	67.0	70.0	74.0	77.0	81.5
	90 %	56.5	61.0	65.0	69.0	72.5	76.5	80.5
	100 %	55.0	59.0	63.0	67.5	71.5	75.5	79.5

The factory setting of the thermostat is 4.

Danfoss A/S

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• 1210 Danfoss I DCS-S/SI _l_ 2021.08
• 73693940 / AQ228186477437en-010301

FAQS

• Q: What is the factory setting of the thermostat?
  A: The factory setting of the thermostat is 4
• Q: Where should the sensor be placed in a one-pipe system?
  A: In a one-pipe system, the AB-QM needs to be installed after and as close as possible to the last radiator.

Documents / Resources

Danfoss QT,QTL Thermostatic Actuator [pdf] User Guide QT, QTL, 73693940, QT QTL Thermostatic Actuator, QT QTL, Thermostatic Actuator, Actuator

References

• User Manual