
ST7700
INSTALLATION
5 63-2287—1
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to follow
them could damage the product.
2. Refer to Fig. 2 and 3 for proper system wiring.
3. Installer must be a trained, experienced flame safe-
guard technician.
4. Afterinstallation,check out the product per instruc-
tions in this specification sheet.
IMPORTANT: This equipment generates, uses and can
radiate radio frequency energy. If not installed and
used in accordance with the instructions, it may
cause interference to radio communications. It has
beentestedand found to comply with the limits fora
Class A computing device (part 15 of FCC rules)
which are designed to provide reasonable protec-
tion against such interference when operated in a
commercial environment. Operation of this equip-
mentinaresidentialareamaycauseinterference;in
which case, users at their own expense may be
required to take whatever measures are required to
correct this interference.
HUMIDITY
Install the Keyboard and Display Module where the
relative humidity never reaches the saturation point. The
Keyboard and Display Module is designed to operate in a
maximum 85% RH continuous, noncondensing moisture
environment. Condensing moisture may cause improper
Keyboard and Display Module operation.
VIBRATION
DonotinstalltheKeyboardandDisplayModulewhere
itcouldbe subjected to excessive vibration,0.5Gcontinu-
ous maximum.
WEATHER
The Keyboard and Display Module is not designed to
be weather tight; if it is installed outdoors, it must be
protected.
MOUNTING THE KEYBOARD AND DISPLAY
MODULE
NOTE: For installation dimensions, see Fig. 1.
1. The Keyboard and Display Module can be mounted
on the door panel of an electrical enclosure.
2. Select the location on the door panel; be aware that
the Keyboard and Display Module extends 1.4 inches
behind its mounting surface.
3. Using the Keyboard and Display Module as a tem-
plate, mark the four screw locations. Drill the pilot holes.
Provideforanopeningonthepaneldoorformounting,see
Fig. 1.
4. Secure the Keyboard and Display Module to the
panel with four no. 6 screws.
Fig. 4—Keyboard and display module mount-
ing.
Installation
WIRING
1. Refer to Fig. 2 and 3 for proper wiring.
2. Remove line voltage from the control panel by
opening the main disconnect, more than one disconnect
may be involved.
3. All wiring must comply with all applicable electri-
cal codes, ordinances, and regulations.
4. Recommended wire size and type:
a. MaketheKeyboardandDisplayModuleRS-485
ControlBus connections with Belden 8723 cable
or equivalent. The shield is connected to ground
at both ends.
b. Therecommendedwiresizeforthe24Vacpower
input is AWG No.18 wire insulated for voltages
andtemperatures encountered in the application.
Suggested types include TW (60C), THW (75C)
and THHN (90C).
5. Recommendedgroundingpractices—TheKeyboard
and Display Module can be connected to any convenient
earthground.TheControlBusshieldisconnectedtoground
at both ends.
6. Recommended wire routing:
a. Do not route the ControlBus shielded cable in
conduits that carry line voltage circuits.
b. Avoid routing the ControlBus shielded cable
close to the ignition transformer leadwires.
c. Route the ControlBus shielded cable outside of
conduitifproperlysupportedand protected from
damage.
7. The ControlBus requires a termination resistor on
the module farthest from the Chassis Module. This is
accomplished by connecting a 120 Ω1/4 watt resistor
across a and b terminals of the ControlBus connector on