Honeywell T7770A Installation Instructions

BEFORE INSTALLATION

Cover Disassembly
Two locking mechanisms are used on the cover of the wall
module. After installation, to disassemble the cover and the
subbase see Fig. 1.
STEP 2
BUTTON HEAD
SOCKET CAP
SCREW
STEP 1
M11394
Fig. 1. Cover disassembly.
CAUTION
Erratic System Operation Hazard.
Failure to follow proper wiring practices can
introduce disruptive electrical interference (noise).
Keep wiring at least one foot away from large inductive
loads such as motors line starters, lighting ballasts,
and large power distribution panels.
Shielded cable is required in installations where these
guidelines cannot be met.
Ground shield only to grounded controller case.
IMPORTANT
All wiring must comply with local electrical codes
and ordinances or as specified on installation
wiring diagrams.
® U.S. Registered Trademark
© 2004 Honeywell International Inc.
All Rights Reserved
T7770E
6 5
7 0
6 0
7 5
5 5
8 0
8 5
a u
t o
0
1
STEP 3
ALLEN TOOL
T7770A,B,C,D,E,F,G
Wall Modules
INSTALLATION INSTRUCTIONS
— Wall module wiring can be sized from 14 to 22 AWG
(2.0 to 0.34 sq mm) depending on the application.
— The maximum length of wire from a device to a wall
module is 1000 ft (305m).
— Twisted pair wire is recommended for wire runs longer than
100 ft (30.5m).
— The cover for the wall module is packed separately from
the subbase for ease of installation.
See Fig. 2 to release/replace the subbase terminal block.
PRESS SHADED AREA
OF TAB WITH THUMB TO
RELEASE TERMINAL BLOCK
FOR EASIER WIRING
M17988
Fig. 2. Releasing/replacing terminal block.
INSTALLATION
Mount the T7770A,B,C,D,E,F,G Wall Modules on an inside
wall approximately 54 in. (1372 mm) from the floor (or in the
specified location) to allow exposure to the average zone
temperature. Do not mount the wall modules on an outside
wall, on a wall containing waterpipes or near air ducts. Avoid
locations that are exposed to discharge air from registers or
radiation from lights, appliances, or the sun.
The wall modules can be mounted on a wall, on a standard
utility conduit box using No. 6 (3.5 mm) screws or on a 60 mm
wall outlet box (see Fig. 3). When mounting directly on a wall,
use the type of screws appropriate for the wall material.
95-7538—4