Ecos
aire
®
EN Series Precision Air Conditioner Owners Manual
Installation Wiring Control Wiring
43
Ecos
aire
®
July 2007
Data subject to change without notice.
J11
J12
Expansion Memory
J9
J10
C1
Rx
-/
T
x-
NO1
Rx
+
/T
x+
NO2
GND
NO
3
C1
Optional Remote Display
Note: Cables may be supplied , depending on options.
The communication system between the controller and the remote display (if any) is based on ANSI/IEEE RS-
485. For best results, proper RS-485 wiring and splicing methods should be used. These include, but are not lim-
ited to the use of shielded RS-485 cable (Z0=120
Ω
, e.g. Belden 7202A), the use of connectors rated for RS-485,
minimized untwist of conductors, etc.
In some cases, shorter lengths of cable may allow approximations to RS-485 methods. These methods are
shown on the folowing pages. Methods for longer cables will work for shorter cables also.
For cable lengths not exceeding 160 ft (50m) -
3-gang wall box (by others)
At each end of the cable, loop the
modular telephone cable once as shown
through clamp-on split ferrite EMI cores
(by others). The cores should have an
impedance near 240
Ω
at 100MHz.
ex: Steward 28A0640-0A0
available as Digi-Key1 240-2065-ND
Allow at least 10 inches of free cable for
connection to the display.
Insert 6P6C modular telephone
plug (by others) into the modular
port.
electrical enclosure
of unit
Six-pin modular telephone plug
(by others) to be inserted into dis-
play jack.
1. Digi-Key Corp.
1-800-344-4539
www.digikey.com
INST
ALLA
TION
Note:
Depending on options, cables may
be supplied by Dectron.
For cable lengths not exceeding 160 ft.
(50m), it is possible to use a six-conductor
data (reversed) modular telephone cable
(by others). See next page for cable
details.
Communications between the unit and
the remote display can be disrupted by
external electrical noise. Such noise can
be produced by variable speed motor
drives, light dimmers, electric discharge
lighting, and other non-linear electrical
loads. Where this is the case, use fer-
rites as described at right.
Summary of Contents for EN Series
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