TC-Double (+)
On glass heat exchangers the correct position of the seal is im-
portant when connecting the gas lines (see image). The seal
consists of a silicone ring with a PTFE sleeve. The PTFE side
must face the glass thread.
Glass
PTFE
4.3 Electrical connections
The operator must install an external separator for the device
which is clearly assigned to this device.
This separator
• must be located near the device,
• must be easy for the operator to reach,
• must comply with IEC 60947-1 and IEC 60947-3,
• must separate all live conductors and the status output,
and
• must not be attached to the power feed.
WARNING
Hazardous electrical voltage
The device must be installed by trained staff only.
CAUTION
Wrong mains voltage
Wrong mains voltage may damage the device.
Regard the correct mains voltage as given on the type plate.
Connection via plug
The device is equipped with connectors according to EN
175301-803 for mains and status output. If the cables are
mounted properly, they cannot be interchanged. Please make
sure that the connectors are remounted correctly after con-
necting the cable. The following figures show the pin assign-
ment with respect to the numbers printed on the connector.
The supply line cross-sections must be suitable for the rated
current. Use a maximum line cross-section of 1.5 mm²
(AWG 16) and a cable diameter of 8 - 10 mm (0.31 - 0.39 inch).
12
Bühler Technologies GmbH
Plug numbering
Alarm contact S2
The clamping areas for S1 and S2 are 8 - 10 mm (0,31 – 0,39
inch) in diameter.
4.4 Signal outputs
The device has various status signals. The maximum switch-
ing power of the alarm outputs is 250 V AC/150 V DC, 2 A, 50
VA, each.
An alarm is triggered by the alarm contact / status output (S2)
if the temperature in block 1 is outside the specified limits. It
does not indicate if the alarm was triggered due to excess
temperature or insufficient temperature.
Description of signal outputs
Function /
Description
contact type
Re-
internal
the following
gard-
changeover
device statuses
ing S2)
contact:
can be indic-
max.
ated via two
250 V AC /
switching out-
150 V DC, 2 A,
puts:
50 VA
Re-
4-20 mA ana-
Signalling of
gard-
logue output
actual temper-
ing S3)
(R
<500 Ω)
ature in block 1
Load
(please use
shielded
cables)
Electric supply S1
Analogue output S3
1 - N/C
2 - n/c
3 - GND
4 - 4-20 mA out
5 - shield
Contact between 3 and
2 closed (alarm)
• No mains voltage
and/or actual tem-
perature outside
the alarm
thresholds
Contact between 3 and
1 closed (ok)
• Mains voltage at-
tached + actual
temperature
within the alarm
thresholds
With temperature sig-
nal option
T
= -20 °C ≙ (-4 °F) ->
Cooler
4 mA/ 2V
T
= 5 °C ≙ (41 °F) ->
Cooler
9 mA/ 4,5 V
T
= 60 °C ≙ (140 °F) -
Cooler
> 20 mA/ 10 V
BX440021 ◦ 02/2020