Honeywell T7350 User Manual download pdf (Page 12)

T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT

63-4368 12

Cable Termination

The FTT network segment requires termination for proper

data transmission performance. Use a 209541B Termination

Module to connect two of the three termination module wires

to the L

ONWORKS

Bus terminals. Refer to LONWORKS

Bus

Wiring Guidelines form 74-2865 for details.

Singly Terminated Network Segment

In a singly terminated topology segment, only one termination

is required and can be placed anywhere on the segment.

Singly terminated segments use the yellow and brown wires.

If the network topology requires a singly terminated

termination module at a T7350H, connect the singly

terminated module wiring on the appropriate terminals as

shown in Fig. 6.

Fig. 6. Singly terminated LonWorks® bus termination

module.

Doubly Terminated Daisy-Chain Network Segment

In a doubly terminated daisy-chained topology segment, two

terminations are required, one at each end of the topology

segment. Doubly terminated segments use the orange and

brown wires. If the network topology requires a doubly

terminated module at a T7350H (T7350H is the first or last

device on the network cable) connect the termination module

wiring on the appropriate terminals as shown in Fig. 7. For

additional wiring information, refer to the E-Bus Wiring

Guidelines, form 74-2865, and the Excel 10 FTT Termination

Module Installation Instructions, form 95-7554.

Fig. 7. Doubly terminated L

ONWORKS

bus termination

modules.

CAUTION

Electrical Shock or Equipment Damage Hazard.

Can shock individuals or short equipment

circuitry.

Disconnect power supply before installation.

IMPORTANT

All wiring must agree with applicable codes, ordi-

nances and regulations.

1. Loosen subbase terminal screws and connect system

wires.

NOTE: Maximum (and recommended) wire size is 18-

gauge. Do not use wire smaller than 22-gauge. Fol-

low equipment manufacturer wiring instructions

when available. Refer to the Wiring Diagram section

for typical hookups. A letter code is located near

each terminal for identification. Refer to the Specifi-

cations section, Tables 8 and 9 for terminal designa-

tions.

2. Securely tighten each terminal screw.

3. Push excess wire back into the hole in the wall.

4. Plug the hole with nonflammable insulation to prevent

drafts from affecting the thermostat.

Wiring Details

LONWORKS

network cable should be wired separately from

the power and I/O wires when installing T7350H models. If

this is not possible, use a minimum of 4 in. (102 mm)

separation between split ferrite cores (Fair-Rite 0443164151,

www.fair-rite.com) to ensure compliance with Class B limits

(does not apply to Class A limits). See Fig. 8 to apply ferrite

cores to L

ONWORKS

Bus input and output.

Step 4. Prepare Wiring Diagrams

Fig. 9 through 12 show T7350 terminal arrangements and

provide detailed wiring diagrams. Reference these diagrams

to prepare the site-specific job drawings.

Fig. 8. Ferrite core wires from T7350H to L

ONWORKS

inputs and outputs.

ORANGE

BROWN

YELLOW

PART NO. 209541B

TERMINATION MODULE

M22494

AUX

SUBBASE

W1 GY1

W3/Y4 Y3 W2

AUXRH

T5 T6 T7 T4

OSOS ASAS

MHC HPHSEB

YELLOW

BROWN

ORANGE

PART NO. 209541B

TERMINATION MODULE

M22495

AUX

SUBBASE

W1 GY1

W3/Y4 Y3 W2

AUXRH

T5 T6 T7 T4

OSOS ASAS

MHC HPHSEB

M22496

WIRES TO T7300H

COMMUNICATING SUBBASE

WIRES TO T7300H

COMMUNICATING SUBBASE

WIRES TO ALL

INPUTS AND

OUTPUTS

WIRES TO ALL

INPUTS AND

OUTPUTS

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 43 44

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Honeywell T7350 User Manual Page 12

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