Wiring Subbase - Honeywell 7800 SERIES Instruction Manual

Wiring Subbase

WARNING
Electrical Shock Hazard or Equipment Damage
Hazard.
Can cause sever injury, death or equipment
damage.
Disconnect the power supply before beginning
installation. More than one disconnect may be
involved.
The internal block diagram of the EC/RM7830A is shown in
Fig. 1 and the internal block diagram of the EC/RM7850A is
shown in Fig. 2.
1. For subbase wiring and sequence charts, refer to Fig. 3
and 4.
2. For remote wiring of the KDM, refer to the Specifications
for the KDM (65-0090), Network Interface Unit
(63-2278), Data ControlBus™ Module (65-0091),
S7810M ModBus Module (65-0249) or Extension Cable
Assembly (65-0131).
3. Disconnect the power supply from the main disconnect
before beginning installation to prevent electrical shock
and equipment damage. More than one disconnect can
be required.
4. All wiring must comply with all applicable electrical
codes, ordinances and regulations. Wiring, where
required, must comply with NEC Class 1 (Line Voltage)
wiring.
5. For recommended wire size and type, see Table 1.
6. 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.
EC7830A, RM7830A, EC7850A, RM7850A 7800 SERIES RELAY MODULES
c. Enclose flame detector leadwires without armor
cable in metal cable or conduit.
d. Follow directions in flame detector, Data Control-
Bus™ Module, or Remote Reset Module Instruc-
tions.
7. For recommended grounding practices, see Table 2.
8. The KDM is powered from a low voltage, energy limited
source. Mount the KDM outside of a control panel when
it is protected from mechanical damage.
IMPORTANT
A 13 Vdc power supply must be used any time more
than one KDM is used. A maximum of two KDM,
Data ControlBus™ Modules or S7810B Multi-Drop
Switch Modules are allowed in any combination.
9. Maximum wire lengths:
a. EC/RM7830A and EC/RM7850A leadwires: The
maximum leadwire length is 300 feet (91 meters) to
terminal inputs (Control, Running/Lockout Interlock).
b. Flame Detector leadwires: The maximum flame
sensor leadwire length is limited by the flame signal
strength.
c. Remote Reset leadwires: The maximum length of
wire is 1000 feet (305 meters) to a Remote Reset
pushbutton.
d. Data ControlBus™ Module: The maximum Data
ControlBus™ Module cable length 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).
10. Be sure loads do not exceed the terminal ratings. Refer
to the label on the relay module or to the terminal
ratings in Tables 3A, 3B, 3C and 3D.
3 66-1092—06