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TM250-24/D
53
74
T M 2 5 0- 2 4 /D
85
IMPORTANT: Read these
instructions before installation
!
and wiring of the product.
A
Fig 1
B
1
2
3
%RH
Temp
Till/On
Diff
Från/Off
SD
Från/Off
Setpoint
Diff
Diff
Till/On
R1 R2
%RH
Temp
Fig 2
R1 R2
A
B
B
Till/On
1
2
3
Till/On
Diff
R1 R2
Från/Off
Diff
Diff
SD
Från/Off
Setpoint
Från/Off
SD
Diff
Diff
Från/Off
A
A
B
Diff
Till/On
1
2
3
Till/On
Temp
Fig 3
%RH
I = R1
II = R2
Till/On
A
B
III = R1+R2
B
1
2
3
III
Till/On
I = R1
Från/Off
II
II = R2
Till/On
III = R1+R2
Från/Off
Diff
I
SD
Från/Off
Setpoint
Från/Off
SD
I
Diff
Från/Off
A
A
B
Till/On
II
1
2
3
Från/Off
Till/On
III
Till/On
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Box 116 428 22 KÅLLERED SWEDEN
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INSTRUCTIONS
Thermostat, on - off with two relay outputs
with adjustable step differential and hysteresis
TM250-24/D is a thermostat with two SPST closing relay outputs
with adjustable step differential and hysteresis and provisions for a
fixed night setback. Using the switches the TM250-24/D can be set
to fit various applications. TM250-24/D is built for DIN-rail mounting
and has all settings accessible on the front.
Installation
Mount the TM250-24/D on a DIN-rail in a cabinet or other enclosure.
Protection class:
IP20.
Ambient temperature:
0...50°C.
Wiring
Supply voltage
Supply voltage: 24V AC +/-15% 50...60Hz.
Power consumption: 5VA maximum.
Terminal 11 = System neutral.
Terminal 12 = Phase.
Outputs
Two closing relays 10A 230V AC.
Terminals 1 and 2 = Relay 1.
Terminals 5 and 6 = Relay 2.
Sensor
Terminals 7 and 8.
Night setback
Terminals 9 and 10
Potential free closure gives a fixed 5K night setback.
Settings
Setpoint 20...50°C. The temperature at which the relay R1 is
deenergized.
Diff
Hysteresis. 0.5...5K. The difference in temperature
between a relays ON-point and OFF-point. Equal for both
relays.
SD
Step differential. 0...5K. The difference in temperature
between the relays OFF-points.
EMC emissions & immunity standards
This product conforms with the requirements of
European EMC standards CENELEC EN61000-6-1 and
EN61000-6-3 and carries the CE mark.
LVD
This product conforms with the requirements of
European LVD standards IEC 60 730-2-9.
INSTRUCTIONS
Switches
Use the switches to set the relay sequence to fit the application.
N.B. Use the alternatives shown below only. Other settings may
give unpredictable results.
A
Fig 1: R1 ON on decreasing temperature,
B
R2 ON on increasing temperature.
1
2
3
A
Fig 2A: Two steps in sequence on increasing
B
temperature. First R1 then R1+R2.
1
2
3
A
Fig 2B: Two steps in sequence on decreasing
B
temperature. First R1 then R1+R2.
1
2
3
A
Fig 3A: Three steps binary on increasing temp.
B
First R1, then R2 and then R1+R2.
1
2
3
A
Fig 3B: Three steps binary on decreasing temp.
B
First R1, then R2 and then R1+R2.
1
2
3
Switch 4 is for choosing internal or external set-point potentio-
meter. When using an external potentiometer, wire it in series
with the sensor.
7
A
Internal setpoint potentiometer
B
8
4
7
A
External setpoint potentiometer
B
8
4
1
2
3 Not connected
Not connected
4
5
6
7 Sensor input
Signal neutral
8
9
Night setback
Signal neutral
10
Sys.neutral Supply
11
24V
~
12
R1
10A 230V
~
R2
10A 230V
~
in
voltage
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