Honeywell 7800 Series Product Data page 4

7800 SERIESS7800A2142 4-Line LCD Keyboard Display Module
Temperature
Temperatures below 32 °F (0 °C) may cause
a slow screen refresh rate and ghosting.
This effect will be most evident during cold
start-up (display has not been operating
and is in a < 32 °F (0 °C) environment). This
is due to the time required for the display to
warm up. The display has a heater feature
which can be set to automatic/ON/OFF
(refer to page 42 Heater Mode)
If the display does not fully recover within 5
minutes, then check the systems line input
voltage to insure it is within specifications.
For certain RM/ EC7800xx models the
display heater (used to improve display
legibility in colder temperatures) will not be
available and will not function regardless
of what the setting is in the display module
Heater Mode.
Refer to page 43 Models that do not
use the Heater Function for a list of relay
models that do not use the heater function.
Weather
The S7800A is not designed to be weather
tight. If installed outdoors, the S7800A
must be protected by an approved
weather-tight enclosure such as the
204729A or 204729C NEMA 4 Enclosure
listed in Accessories.
S7800A2142 Embedded Features
See Appendix A to set up the following
features:
• Call Service (Business Card) information
displayed when burner system is in
Lockout of the 7800 SERIES device.
• Customizing of Expanded Annunciator
(S7830) message to match a given
installed limit string. If ModBus Feature
is required, use S7810M1003 ModBus
Module.
• ModBus communication setup and
enable feature: Note that this will
occupy terminals 1, 2, 3 of the 203541
Connector on the KDM, which disables
the Expanded Annunciator Features.
SERVICE NOTE:
The S7800A2142 can either do the
Expanded Annunciator Feature or
ModBus -- not both. If BOTH are
required, order the S7810M1003
ModBus Module for the ModBus
option.
B. The S7800A2142 KDM is also used to
program the Valve Prov- ing and Post-
purge feature of Select RM7800 SERIES
devices. See Appendix B.
32-00110-07
Mounting KDM on 7800 SERIES
Relay Module.
1. Align the two interlocking ears of the
KDM with the two mating slots on the
7800 SERIES Relay Module. See Fig. 2.
Fig. 2. Keyboard Display Module mounting.
2. Insert the two interlocking ears into
the two mating slots and, with a hinge
action, push on the lower corners of the
KDM to secure it to the 7800 SERIES
Relay Module.
3. Make sure the KDM is firmly in place.
Remote Mounting KDM
The KDM can be mounted either on the
face of a panel door or on other remote
locations. When mounting the KDM on the
face of a door panel, closely follow these
instructions:
1. Select the location on the door panel for
flush mounting.
2. Pay attention to the insertion
dimensions of the two KDM screws, two
interlocking ears, and the two plug-
in connections to allow for sufficient
clearance.
3. Use the KDM or Data ControlBus
Module™ as a template (Fig. 28)
and mark the two screw locations,
interlocking ear locations and the two
plug-in connector locations.
4. Drill the pilot holes for the mounting
screws.
5. Cut holes in the door panel for the
interlocking ears and the two plug-in
connectors.
6. Mount the KDM, securing it with the
two screws provided in the KDM bag
assembly.
Remote Display Mounting Bracket
Use the 203765 Remote Display Mounting
Bracket when mounting the KDM on a wall
or remote location:
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