Honeywell COMMERCIAL PROGRAMMABLE T7350 - Manual (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 ON W ORKS® Bus terminals. Refer to L ON W ORKS® 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 ON W ORKS® 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
L ON W ORKS® 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 ON W ORKS® 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 ON W ORKS®
inputs and outputs.
ORANGE
BROWN YELLOW
PART NO. 209541B
TERMINATION MODULE
M22494
RC
AUX
X
SUBBASE
W1 G Y1
W3/Y4 Y3 W2 Y2
AUX RH
T5 T6 T7 T4 T3
M
OS OS AS AS
M HC HP HS EB EB
YELLOW
BROWN ORANGE
PART NO. 209541B
TERMINATION MODULE
M22495
RC
AUX
X
SUBBASE
W1 G Y1
W3/Y4 Y3 W2 Y2
AUX RH
T5 T6 T7 T4 T3
M
OS OS AS AS
M HC HP HS EB EB
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.