Wiring Subbase - Honeywell 7800 Series Installation Instructions Manual

RM7838B,C 7800 SERIES RELAY MODULE

Wiring Subbase

WARNING
Electrical Shock Hazard.
Can cause serious personal injury, death or
equipment damage.
Disconnect the power supply before beginning
installation. More than one power supply
disconnect may be required.
1. Refer to Fig. 3 or 4 for proper subbase wiring.
2. For proper remote wiring of the KDM, refer to the
KDM Specifications (65-0090), Data ControlBus
Module™ (65-0091) or Extension Cable Assembly
(65-0131).
3. Make sure all wiring complies with all applicable
electrical codes, ordinances and regulations. Wiring,
where required, must comply with NEC, Class 1
(Line Voltage) wiring.
4. See Table 1 for recommended wire size and type.
5. See Table 2 for recommended grounding practices.
6. Use 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.
32-00199—01
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.
7. KDM: Because the KDM is powered from a low
voltage, energy limited source, mount it outside of a
control panel if it can be protected from mechanical
damage.
NOTE: Use a separate 13 Vdc power supply any time
more than two Data ControlBus Modules™ or
KDM are used or are placed more than 100 feet
(31 meters) from the relay module.
8. Use maximum wire lengths:
a. RM7838B,C leadwires—300 feet (91 meters) to
terminal inputs (Control, Preignition Interlock,
Running/Lockout Interlock, High Purge Switch
and Low Fire Switch).
b. Flame Detector leadwires—limited by the flame
signal strength.
c. Remote Reset leadwires—1000 feet (305 meters)
to a Remote Reset push button.
d. Data ControlBus™ Module—depends on the
number of system modules connected, the noise
conditions and the cable used. The maximum
length of all Data ControlBus™ Module
interconnecting wire is 4000 feet (1219 meters).
9. Make sure loads do not exceed the terminal ratings.
Refer to the label on the RM7838B,C or to the ratings
in Table 4.
4