Orion System Zoning - Manual (Page 26)

26 Orion Systems
Zoning Design Guide
Even though the daisy chain configuration is preferred,
the star configuration can also be used. If required, a
combination of the two can also be used. Remember,
the best communications loop wiring is the one which
utilizes the minimum number of ends while using the
shortest wiring path.
Communication Wiring terminals on most Orion con-
trollers are marked “T”, “R” and “SHLD” (Note: in-
stead of SHLD the CommLink is marked “G”. All wir-
ing should be connected T to T, R to R and SHLD to
SHLD throughout the entire loop system. Communica-
tion wire should be color coded to facilitate error free
wiring. The communication loops will not work if any
of the wires are reversed or otherwise landed incorrectly.
Communications loops can be run up to a maximum of
approximately 4000 ft. in total length. If your system
exceeds this length, please consult the WattMaster fac-
tory for more information regarding extended commu-
nication loop lengths and solutions.
Caution: Unless the communications loop
is installed in conduit, be careful to
position the cable away from high
noise devices like fluorescent
lights, transformers, VFD’s, etc.
Conduit is not required for com-
munications loop wiring unless
required by local codes.
Tip: Incorrect wiring of the communications
loop is the most common mistake made
during installation. Before beginning
installation, write down the wire color
used on each terminal connection and
consistently maintain that color code. It
is recommended that a continuous wire
run be made between devices. Anytime
a splice is made in the cable you increase
your chance of problems. If a splice must
be made, be very sure that you have a good
connection. Cable should be soldered and
wrapped or if soldering is not possible use
wire nuts or butt splices. Connectors should
then be wrapped tightly with electrical tape.
Caution: Make sure when you are inserting
wires into the terminal blocks that
strands of wire do not stick out and
touch the adjacent terminals. If
adjacent wires touch each other or
another terminal, shorting and
subsequent damage to the circuit
board could result.
Controller Wiring
All controller wiring should be in accordance with all
local, state, and national codes. It is recommended that
all wire be a minimum of 18 AWG unless otherwise
specified in the charts below. Controller connections
and wire sizing is as follows:
VAV/CAV Controller
•
24 VAC Supply Voltage (8 VA)
(2) Conductors - Determine minimum
wire size from Figure 1-16 on page 26.
•
Communications Loop
(2) Conductors 18 gauge minimum
twisted pair with shield
(WattMaster communication wire,
Belden #82760 or equal)
•
Supply Air Temperature Sensor
(2) Conductors 24 gauge minimum
•
Return Air Temperature Sensor
(2) Conductors 24 gauge minimum
•
Outside Air Sensor
(2) Conductors 24 gauge minimum
•
Supply Static Pressure Sensor
(2) Conductors 24 gauge minimum
•
Bypass Damper
(3) Conductors 24 gauge minimum
•
HVAC Unit Control Wiring
(6) Conductors 24 gauge minimum
R (Common), G (Fan), Y1 (Cool 1),
Y2 (Cool 2), W1 (Heat 1), W2 (Heat 2)
For VAV/CAV Controller With
Optional Staging Expansion Board up to
an additional (8) conductors Y3 through
Y6, W3 Through W6
System Installation