3 EWPC 961/S 7/2000 ing
Select a location which will not be subject
to high humidity or condensation and allow
some ventilation to provide cooling to the
instrument.
ELECTRICAL WIRING
The instrument is equipped with an internal
screw terminal block suitable for max
2.5 mm
2
wiring (one wire each terminal
only, in compliance with VDE norms).
Make sure that the power supply corre-
sponds with the rating shown on the in-
strument, i.e. 12…24 Va/c.
The 2-wire PTC type probe does not re-
quire polarity and can easily be extended
by using common 2-lead wire.
It is strongly recommended to run the
probe cable separate from line voltage
wiring. Also, it is good practice to install the
tip of the probe in upright position, to avoid
moist from entering into the stainless steel
sensor housing. The output relay contacts
are voltage-free and are suitable for in-line
switching of compressors up to 0.5 HP at
220 Va (or 0.25 HP to 110 Va). For larger
loads, an external contactor must be used.
ERROR ANNOUNCIATION
The instrument is provided with only one
error message “E1”, both in case of short-
ed sensor and in case of sensor break, or
sensor absence.
The “E1” error message also appears in
the event of underrange of the system tem-
perature or in the event of overrange of the
system temperature.
TECHNICAL DATA
Housing: black ABS plastic, self-estin-
guishing.
Dimensions: front 74x32 mm
(2.913x1.260"), depth 67 mm (2.637").
Mounting: flush panel mount with mount-
ing bracket.
Protection: the instrument frontpanel is
waterproof IP65; an optional snap-on cov-
er can be supplied to provide additional
protection of the rear terminal block.
Connections: screw terminal block
(2.5 mm
2
; one wire each terminal only, in
compliance with VDE norms).
Display: 12.5 mm LED (0.50").
Push buttons: located on front panel.
Data storage: non-volatile EEPROM
memory.
Operating temperature: –5…65 °C
(23…149 °F).
Storage temperature: –30…75 °C
(–22…167 °F).
Output: one (1) SPDT relay 8(3)A 250Va.
Input: PTC probe.
Serial connection: RS-485 serial port for
connection to the Televis system.
Televis system compatibility: software
rel 2.0.4 or greater.
Resolution: 1 °C (°F).
Accuracy: better than 0.5% of full scale.
Power supply: 12…24 Va/c.
DISCLAIMER
This manual and its contents remain the
sole property of Invensys Climate Controls
s.p.a., and shall not be reproduced or dis-
tributed without authorization. Although
great care has been exercised in the
preparation of this document, Invensys
Climate Controls s.p.a., its employees or
its vendors, cannot accept any liability
whatsoever connected with its use.
Invensys Climate Controls s.p.a. reserves
the right to make any changes or improve-
ments without prior notice.
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