Wiring - Honeywell RM7824A Product Data

IMPORTANT
1. 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).
2. Two C7024E,F Detectors can be connected in
parallel.
3. This equipment generates, uses and can radiate
radio frequency energy, and if not installed and used
in accordance with the instructions, may cause
interference to 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 may cause
interference, in which case the users, at their own
expense, may be required to take whatever
measures are required to correct this interference.
4. This digital apparatus does not exceed the Class B
limits for radio noise of digital apparatus set out in the
Radio Interference Regulations of the Canadian
Department of Communications.
Humidity
Install the RM7824A where the relative humidity never
reaches the saturation point. The RM7824A is designed to
operate in a maximum 85 percent relative humidity,
continuous, noncondensing moisture environment.
Condensing moisture can cause a shutdown.
Vibration
Do not install the RM7824A where it could be subjected to
vibration in excess of 0.5G continuous maximum vibration.
Weather
The RM7824A is not designed to be weather tight. If installed
outdoors, the RM7824A must be protected by an approved
weather-tight enclosure.
Mounting Wiring Subbase
NOTE: For installation dimensions, see Fig. 1 or 2.
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 in an electrical
panel. The Q7800 can be mounted directly in the control
cabinet. Be sure to allow adequate clearance for
servicing, installation, access and removal of the
RM7824A, dust cover, flame amplifier, flame amplifier
signal voltage probes, 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. Drill the pilot
holes.
7800 SERIES RM7824A RELAY MODULE
4. Mount the subbase securely using four No. 6 screws.

WIRING

1. General
a. For the internal block diagram of the RM7824A, see
Fig. 5.
b. For proper subbase wiring, refer to Fig. 6.
c. For proper remote wiring of the Keyboard Display
Module; refer to the Specifications for the Keyboard
Display Module (65-0090), Communication
Interface Base Unit (63-2278), Data ControlBus™
Module (65-0091), or Extension Cable Assembly
(65-0131).
2. 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 all appropriate electrical
codes, ordinances and regulations. Wiring, where
required, must comply with NEC Class 1 wiring.
4. Recommended wire size and type: Use No. 14, 16, or
18 copper conductor (TTW60C or THW75C or
THHN90C) 600 volt insulation wire for all low voltage
terminals. For high temperature installations, use wire
selected for a temperature rating above the maximum
operating temperature. All leadwires must be moisture
resistant.
5. The maximum number of wires per terminal is two. If
more than two wires need to be connected to a terminal,
wire one of the wires to the terminal and use a wire nut
to connect the other wires inside the subbase.
6. Recommended wire routing for flame detector lead-
wires:
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 a conduit with line
voltage circuits.
c. Enclose scanner wires without armor cable in metal
cable or conduit.
d. Follow directions given in the flame detector
instructions.
7. Maximum wire lengths:
a. For the RM7824A, the maximum length of leadwire
to the control terminal input is 300 feet.
b. For the flame detector leadwires, the maximum
flame sensor leadwire length is limited by the flame
signal strength.
8. Make sure loads do not exceed the terminal ratings.
Refer to the label on the RM7824A or to the ratings in
the specifications; see Table 1.
9. Check the power supply circuit. The voltage tolerance
must match those of the RM7824A. A separate power
supply circuit may be required for the RM7824A with the
required disconnect means and overload protection
added.
10. Check all wiring circuits and complete the Static
Checkout section before installing the RM7824A on the
subbase; see Table 5.
11. Install all electrical connectors.
12. Restore power to the panel.
7 65-0155—2