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Multiple UCM's per Auxiliary Duct
Temperature Sensor
Up to three (3) UCMs may be con-
nected to a single auxiliary duct
temperature sensor.
— Connect terminal connections TB3-5
and TB3-6 in parallel (i.e. daisy chain)
from the master UCM to the slaved
UCM(s). NOTE: Proper polarity must be
maintained.
— Cut jumper wire W4 on the slaved
UCMs (never cut jumper wire W4 on
the master UCM).
Zone Sensor Options
Depending on the zone sensor options
used, a maximum of five wires may be
required to run from the UCM to the
zone sensor. The zone sensor options
are:
— Zone sensor only (2 wires) – Part
Number X13510609-01.
— Zone sensor with external adjustable
set point and communications jack (5
wires) – Part Number X13510606-01.
— Zone sensor with external adjustable
night set back, timed override (TOV) on/
cancel button, and communications
jack (5 wires) – Part Number
X13510606-02.
— Sensor with night set back, timed
override (TOV) on/cancel button, and
communications jack (4 wires) – Part
Number X13510606-03.
— Digital zone sensor - Part Number
X13511067-01
NOTE: All wiring from the zone sensor to
the Com link must be twisted shielded
pair wiring.
Communication Wiring
Communication Link Wiring
The "Communication Link" is the
communication wiring between Tracer
Summit and all VAV box Unit Control
Modules (UCM). Tracer Summit
be connected to the UCM communica-
tion link in a "daisy chain" configura-
tion.
12
UCM 4.0 Installation
and Wiring
Note: It is not necessary for each UCM
to be connected to the line in sequential
order by address. Also, multiple
communication links may be run and
terminated at the Tracer Summit.
However, a consistent, documented
wiring path will help troubleshoot
communication problems after
installation.
Field wiring for the communication
link must meet the following
requirements:
1. All wiring must be in accordance with
the National Electrical code and local
codes.
2.Communication link wiring must be at
least 18 AWG twisted shielded pair
wire. Shields must be grounded at the
Tracer Summit or Central Control
Panel (CCP) only. More than one
ground reference will cause
communications failures. Shields
must be daisy chained. Tape the shield
at the last VAV UCM to prevent any
connection between the shield and
ground. Wire specifications are as
follows:
Plenum Cable
Stranded, tinned copper insulated
with extruded FEP . Conductors cabled
and shielded with overall aluminum/
Mylar tape and stranded, tinned
copper drawn wire. Extruded jacket,
300 volt, 150°C NEC 725-2 (b) class 2,
type CL2P , 25 pF/ft.
Non-Plenum Cable
Stranded tinned copper insulated with
polyethylene. Conductors cabled and
shielded with overall aluminum/
polyester tape and stranded, tinned
copper drain wire. Chrome gray PVC
jacket, 300 volt, 60°C NEC type CM, 24
pF/ft.
®
can
Wire Capacitance
Wire capacitance must comply with the
following table:
Max. Communication
Link Wiring Length
Wire Capacitance
1,000 feet (304.8m)
Up to 60 pF/ft. (196.9 pF/m)
2,000 feet (609.6 m) Up to 50 pF/ft. (164.0 pF/m)
3,000 feet (914.4m)
Up to 40 pF/ft. (131.2 pF/m)
4,000 feet (1,219.2 m) Up to 30 pF/ft. (98.4 pF/m)
5,000 feet (1,524 m)
Up to 25 pF/ft. (82.0 pF/m)
3.The maximum wire length should not
exceed 5,000 feet (1,524 m).
4.Communication link wiring cannot pass
between buildings.
5.A maximum of 63 UCMs can be
connected to each COM Link. Daisy
chaining is a typical configuration.
"STAR" chaining is also acceptable.
Note: Polarity is extremely important
and must be observed on communica-
tion link connections.
6.At the VAV box, communication link
wires must be connected to TB2-1, 3 (+)
and TB2-2, 4 (-) terminals on the UCM.
7 . Verify that the UCM address is properly
set (DIP switch SW1). See Table 4 for
proper DIP switch settings.
Max.
VAV-SVX01B-EN
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