Mounting Wiring Subbase; Wiring Subbase - Honeywell 7800 SERIES Installation Instructions Manual

RM7838A 7800 SERIES RELAY MODULES
IMPORTANT
1. Wiring connections for the relay module are unique;
refer to Fig. 2 or the correct Specifications for proper
subbase wiring and sequence charts.
2. Wiring must comply with all applicable codes,
ordinances and regulations.
3. Wiring must comply with NEC Class 1 (Line Voltage)
wiring.
4. Loads connected to the RM7838A must not exceed
those listed on the RM7838A label or the
Specifications; see Table 3.
5. Limits and interlocks must be rated to simultaneously
carry and break current to the ignition transformer, pilot
valve, and main fuel valves.
6. All external timers must be listed or component-
recognized by authorities having proper jurisdiction.
7. For on-off gas-fired systems, some authorities who
have jurisdiction prohibit the wiring of any limit or
operating contacts in series between the flame
safeguard control and the main fuel valve(s).
8. Two flame detectors can be connected in parallel with
the exception of Infrared Flame Detectors (C7015).
9. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in
accordance with the instructions, can cause
interference with radio communications. It has been
tested and found to comply with the limits for a Class B
computing device of Part 15 of FCC rules, which are
designed to provide reasonable protection against such
interference when operated in a commercial
environment. Operation of this equipment in a
residential area can cause interference, in which case,
users, at their own expense, may be required to take
whatever measures are required to correct this
interference.
10. This digital apparatus does not exceed the Class B
limits for radio noise for digital apparatus set out in the
Radio Interference Regulations of the Canadian
Department of Communications.
Location
Humidity
Install the relay module where the relative humidity never
reaches the saturation point. The relay module is designed to
operate in a maximum 85% relative humidity continuous,
noncondensing, moisture environment. Condensing moisture
can cause a safety shutdown.
Vibration
Do not install the relay module where it could be subjected to
vibration in excess of 0.5G continuous maximum vibration.
Weather
The relay module is not designed to be weather tight. When
installed outdoors, protect the relay module in an approved
weather-tight enclosure.
66-1087—2

Mounting Wiring Subbase

1. Mount the subbase in any position except horizontally
with the bifurcated contacts pointing down. The standard
vertical position is recommended. Any other position
decreases the maximum ambient temperature rating.
2. Select a location on a wall, burner or electrical panel.
The Q7800 can be mounted directly in the control
cabinet. Be sure to allow adequate clearance for
service, installation, access or removal of the
RM7838A, expanded annunciator, keyboard display
module, flame amplifier, flame amplifier signal voltage
probes, run/test switch, electrical signal voltage probes
and electrical field connections.
3. For surface mounting, use the back of the subbase as a
template to mark the four screw locations, then drill the
pilot holes.
4. Securely mount the subbase using four no. 6 screws
(not provided).

Wiring Subbase

CAUTION
Electrical Hazard.
Can cause electrical shock or equipment/
control damage.
Disconnect the power supply before beginning wiring.
More than one disconnect can be required.
1. For proper subbase wiring and sequence chart, see
Fig. 2.
2. For proper remote wiring of the keyboard display
module, refer to the Specifications for the keyboard
display module. (65-0090), network interface unit
(63-2278), Data ControlBus Module™ (65-0091) or
extension cable assembly (65-0131).
3. All wiring must comply with all applicable electrical
codes, ordinances and regulations. Wiring, where
required, must comply with NEC, Class 1 (Line Voltage)
wiring.
4. Recommended wire routing of leadwires:
a. Do not run high voltage ignition transformer wires
in the same conduit with the flame detector, Data
ControlBus Module™, or remote reset module
wiring.
b. Do not route flame detector, Data ControlBus
Module™ or remote reset module leadwires in
conduit with line voltage circuits.
c. Enclose flame detector leadwires without armor
cable in metal cable or conduit.
d. Follow directions in flame detector, Data
ControlBus Module™ or remote reset module
instructions.
2