Cable Termination; Wiring Details; Step 4. Prepare Wiring Diagrams - Honeywell T7350 System Engineering

T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT

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 W Bus terminals. Refer to L
ON ORKS
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.
SUBBASE
T5 T6 T7 T4 T3
EB EB HS HC HP
BROWN YELLOW
PART NO. 209541B
TERMINATION MODULE
ORANGE
Fig. 6. Singly terminated LonWorks® bus termination
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.
SUBBASE
T5 T6 T7 T4 T3
EB EB HS HC HP
BROWN ORANGE
PART NO. 209541B
TERMINATION MODULE
YELLOW
Fig. 7. Doubly terminated L
modules.
63-4368
W
ON ORKS
OS OS AS AS AUX W3/Y4 Y3 W2
M M X RH RC AUX W1 Y1
M22494
module.
OS OS AS AS AUX W3/Y4 Y3 W2
M M X RH RC AUX W1 Y1
M22495
ORKS ®
W bus termination
ON
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment
®
Bus
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-
Y2
cations section, Tables 8 and 9 for terminal designa-
tions.
G
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

®
L W network cable should be wired separately from
ON ORKS
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 W
ON

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.
1.
Y2
G
M22496
Fig. 8. Ferrite core wires from T7350H to L
12
ORKS ®
Bus input and output.
WIRES TO T7300H
COMMUNICATING SUBBASE
2.
WIRES TO ALL
INPUTS AND
OUTPUTS
WIRES TO T7300H
COMMUNICATING SUBBASE
inputs and outputs.
WIRES TO ALL
INPUTS AND
OUTPUTS
ORKS ®
W
ON