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Installation

16 VAV-SVN09B-EN

air temperature. In order for the auxiliary sensor to

function as a supply air temperature sensor on VAV units

with reheat and

to properly determine the control action

(heat, cool) it must be located upstream of the VAV unit.

The auxiliary temperature is then compared to the zone

temperature. If the supply air temperature is 10 degrees

above the zone temperature, then the control action will be

heat. If the supply air temperature is less than or equal to

the zone temperature, then the control action will be cool.

If the supply air temperature is between the zone

temperature and the zone temperature + 10ºF (5.5°C)(zone

temperature < supply air temperature < zone temperature

+ 10ºF) (5.5°C), the control action remains the same and the

UCM controls to the minimum flow set point. If an

auxiliary sensor is not installed the UCM will retain the last

control action in effect.

Communication Link Wiring

UCM 4.2

The “Communication Link” is the communication wiring

betweenTracer Summit™ and all VAV box Unit Control

Modules (UCM).Tracer Summit can be connected to the

UCM communication link in a “daisy chain” configuration.

Note: All wiring from the zone sensor to the Comm link

must be twisted shielded pair wiring.

The “Communication Link” is the communication wiring

betweenTracer Summit and all VAV box Unit Control

Modules (UCM).Tracer Summit can be connected to the

UCM.

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 theTracer 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 theTracer 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 lastVAV UCM to prevent

any connection between the shield and ground.

Plenum Cable and Non-Plenum Cable 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.

Wire Capacitance

Wire capacitance must comply with the following table:

1. The maximum wire length should not exceed 5,000

feet (1,524 m).

2. Communication link wiring cannot pass between

buildings.

3. A maximum of 63 UCMs can be connected to each

COM Link. Daisy chaining is a typical configuration.

4. Polarity is extremely important and must be observed

on communication link connections.

5. At the VAV box, communication link wires must be

connected toTB2-1, 3 (+) andTB2-2, 4 (-) terminals on

the UCM.

6. Verify that the UCM address is properly set (DIP switch

SW1). See

Table 7 for proper DIP switch settings.

DIP Switch Settings

DIP Switch SW1 contains six switches for addressing the

UCM.These switches allow a user to set a unique

communication address for each UCM. Each UCM on a

given communication link must have a unique address in

order forTracer Summit or the CCP to communicate to it.

See Table 8 for UCM 4.2 DIP switch settings.

Table 7. Max wire capacitance

Max. Communication Link

Wiring Length Max. 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)

Table 8. DIP switch settings

UCM

Unit #

Eware

Address Dip 1 Dip 2 Dip 3 Dip 4 Dip 5 Dip 6

1 65 OFF ON ON ON ON ON

2 66 ON OFF ON ON ON ON

3 67 OFF OFF ON ON ON ON

4 68 ON ON OFF ON ON ON

5 69 OFF ON OFF ON ON ON

6 70 ON OFF OFF ON ON ON

7 71 OFF OFF OFF ON ON ON

8 72 ON ON ON OFF ON ON

9 73 OFF ON ON OFF ON ON

10 74 ON OFF ON OFF ON ON

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 55 56

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