Danfoss RT 2 Thermostat Installation Guide
- June 3, 2024
- Danfoss
Table of Contents
Danfoss RT 2 Thermostat
Technical data
Charge
| ****
Type
| ****
Range [°C]
| Max. permissible bulb temperature [°C]
---|---|---|---
Adsorption
| RT 2| -25 − 15| 150
RT 7
RT 8| -20 − 12| 145
RT 12| -5 − 10| 65
RT 14| -5 − 30| 150
RT 15| 8 − 32
RT 23| 5 − 22| 85
RT 24| 15 − 34| 105
RT 25| -5 − 50| 150
Ambient temperature: -50 °C–70 °C
Min. temperature variation rate: < 1K/15 minutes.
Enclosure: IP66 acc. to IEC 529.
Contact load: See switch cover or fig. 3.
The marking, e.g.10 (4) A, 400 V ~ AC means that max. connection current is 10
A ohmic and 4 A inductive at 400 V. The max. starting current on motor cutin
(L.R.) may
be up to seven times the inductive load – but max. 28 A.
Fitting
A set of Pg13.5 cable gland is attached to the RT in a separate bag. To ensure
IP66 (units with automatic reset) or IP54 (units with external reset) grade of
RT enclosure
it is necessary to assemble this gland as shown in the fig. 2. If this gland
is not used with a cable, a metal blinding should be also assembled.
Use the mounting holes 25.
The bulb should be fixed to the wall by means of a bulb holding bracket 26.
If it is desired to install the bulb in a water or brine tank, this can be
done by using either a capillary stuffing box 31 or a bulb pocket 30. 31 and
30 can be obtained as accessories.
Electrical connection See fig. 14
START = make. STOP = break.
DIFF = differential.
Cable diameter: 6–14 mm
The earth terminal 38 should be connected to earth.
Adjustment
See figs. 3 and 14
Set the thermostat for minimum actuating temperature (range setting).
Setting is done by rotating the knob 5, at the same time reading the main
scale 9.
The differential is set by rotating the differential adjusting nut 19
according to the nomogram concerned.
Maximum actuating temperature is the sum of the temperature setting and the
differential.
Example: Thermostat RT 2
Range setting (min. actuating temp.) = 10 °C
Differential setting with differential adjusting nut = 5.
Actual differential = 12 °C
Max. actuating temperature = 10 °C + 12 °C = 22 °C
Connection to terminals 1–4:
The switch breaks the circuit when the temperature has fallen to 10 °C, and
makes it when the temperature has again risen to 22 °C
Connection to terminals 1–2:
The switch makes the circuit when the temperature has fallen to 10 °C and
breaks it when the temperature has again risen to 22 °C
In general, turning the knob automatically moves both the maximum and minimum
actuating temperatures (break and make) up or down because of the fixed
differential.
On the other hand, turning the differential adjusting nut only alters the
maximum actuating temperature.
