Product Overview

7800 SERIES Q7800A,B 22-TERMINAL UNIVERSAL WIRING SUBBASE
5 65-0084—4
7. After installation is complete, check out product
operation as provided in these instructions.
WARNING
Electrical Shock Hazard.
Can cause serious injury, death or property
damage.
Disconnect power supply before beginning installation
to prevent electrical shock and equipment damage.
More than one disconnect may be involved.
Follow the equipment manufacturer instructions if available;
otherwise, proceed as follows below.
Mounting
NOTE: For installation dimensions, see Fig. 1 and 2.
1. Place the subbase in a location within the ambient
temperature rating of the 7800 SERIES Relay Module
and S7830A being used. Refer to the appropriate
Instructions.
2. Mount the subbase in any position except horizontally
with the bifurcated contacts pointing down. The
standard vertical position is recommended.
3. Select a wall, burner or electrical panel location. Or
mount the Q7800 directly in the control cabinet. Be sure
to allow adequate clearance for servicing, installation,
access or removal of the 7800 SERIES Relay Module,
S7830A, Keyboard Display Module, Run/Test switch,
flame amplifier signal voltage probes, electrical signal
voltage probes and electrical field connections.
IMPORTANT
Do not mount the wiring subbase horizontally with
the bifurcated contacts pointing down.
4. For surface mounting, use the back of the subbase as a
template to mark the four screw locations. Drill the pilot
holes.
5. Insert the mounting screws using four no. 6 screws
tightened securely.
WIRING
1. Refer to the equipment manufacturer’s wiring
information and the appropriate 7800 SERIES Relay
Module or S7830A Specifications for correct subbase
wiring.
2. Provide overload protection and disconnect means as
required. Disconnect the power supply from the main
disconnect before beginning installation to prevent
electrical shock and equipment damage. More than one
disconnect may be involved.
3. All wiring must comply with appropriate electrical codes,
ordinances and regulations. Use NEC Class 1 (Line
Voltage) wiring.
4. Recommended wire size and type is to use up to two
no. 14, 16, or 18 copper conductors TTW60C, THW75C
or THHN90C, 600 volt insulation wire for all Line Volt-
age terminals. For high temperature installations, use
wire selected for a temperature rating above the noted
maximum operating temperature. The flame detector
leadwires should be moisture resistant.
a. For the ignition leadwire, use Honeywell
specification no. R1061012 Ignition Cable or
equivalent. (This wire is rated at 350°F (177°C) for
continuous duty, and up to 500°F (260°C) for
intermittent use. It has been tested to 25,000 volts.)
b. For the flame detector F leadwire, use Honeywell
specification no. R1298020 or equivalent. (This wire
is rated at 400°F (204°C) for continuous duty. It is
tested for operation up to 600 volts and breakdown
up to 7500 volts.)
c. For ignition installation in a contaminating
environment, use Honeywell specification no.
R1239001 High Tension Ignition Cable or
equivalent. (This wire is resistant to severe
conditions of oil, heat and corona, and is tested to
withstand high voltages up to 25,000 Vrms in a salt
bath for one minute without breakdown. It is rated at
200°F (93°C) for continuous duty, and up to 350°F
(177°C) for intermittent use.)
5. Recommended grounding practices:
a. Each 7800 SERIES Relay Module or S7830A will
have an earth ground terminal G that must be
grounded to the metal control panel with wire as
short as practical. Each ground wire must be
capable of carrying a fault current equal to the rating
of the protective fuse (15 amperes maximum, type
SC or equivalent, fast-blow fuse); a number 14
copper conductor is adequate.
b. The earth ground provides a connection between
the subbase and the control panel or the equipment.
The earth ground wire must be capable of
conducting the current to blow the 15A maximum,
type SC or equivalent, fast-blow fuse (or breaker) in
event of an internal short circuit. The 7800 SERIES
Relay Module needs a low impedance ground
connection to the equipment frame which, in turn,
needs a low impedance connection to earth ground.
For a ground path to be low impedance at RF
frequencies, the connection must be made with
minimum length conductors that have maximum
surface areas. Wide straps or brackets are preferred
rather than leadwires. Be careful to ensure that
mechanically tightened joints along the ground path,
such as pipe or conduit threads or surfaces held
together with fasteners, are free of nonconductive
coatings and have corrosion-protected mating
surfaces.
6. Recommended wire routing for flame detector
leadwires:
a. Do not run high voltage ignition transformer wires in
the same conduit with the flame detection wiring.
b. Do not route scanner wires in the same conduit with
line voltage circuits.
c. Scanner wiring not utilizing armor cable should be
enclosed in metal cable or conduit.
d. Follow directions in Flame Detector Instructions.
7. Maximum wire lengths for flame detector leadwires are
limited by the flame signal strength.
8. Make sure that loads do not exceed terminal ratings;
refer to the labels on the 7800 SERIES Relay Module,
or S7830A, or ratings in the 7800 SERIES Relay
Module or S7830A Specifications.