Wiring Subbase - Honeywell 7800 Series Installation Instructions Manual

EC7820A 7800 SERIES RELAY MODULES

Wiring Subbase

WARNING
Electrical Shock or Equipment Damage Hazard.
Can cause personal injury or equipment and
control damage.Disconnect all power supplies
before beginning installation.
1. For proper subbase wiring, refer to Fig. or 4.
2. For proper remote wiring of the KDM, refer to the
Specifications for the 2-line VDF KDM (65-0090),
the 4-line LCD KDM (32-00110), Data ControlBus
Module™ (65-0091) or Extension Cable Assembly
(65-0131).
3. Disconnect the power supply from the main discon-
nect before beginning installation to prevent electri-
cal shock and equipment damage. More than one
disconnect may be required.
4. All wiring must comply with all applicable electrical
codes, ordinances and regulations. Where required,
wiring must comply with NEC, Class 1 (Line Voltage)
wiring.
5. For recommended wire size and type, see Table 1.
6. For recommended grounding practices, see Table 2.
7. Use recommended wire routing of lead wires:
a. Do not run high voltage ignition transformer
wires in the same conduit with the flame detec-
tor, Data ControlBus Module™, Modbus Module
or Remote Reset Module wiring.
b. Do not route flame detector, Data ControlBus
Module™, Modbus Module or Remote Reset
Module lead wires in conduit with line voltage
circuits.
c. Enclose flame detector lead wires without armor
cable in metal cable or conduit.
Application
Line Voltage Terminals
Keyboard Display Module
a
KDM
Data ControlBus Module™
Modbus™ Module
a
The KDM, Data ControlBus Module™ (for remote mounting or communications) or Modbus™ Module must be wired in
a daisy chain configuration, (1(a)-1(a), 2(b)-2(b), 3(c)-3(c)). The order of interconnection of all the devices listed above
is not important. Be aware that modules on the closest and farthest end of the daisy chain configuration string require
a 120 ohm (1/4 watt minimum) resistor termination across terminals 1 and 2 of the electrical connectors for connec-
tions over 100 feet (ca. 30 meters).
32-00197—01
Table 1. Recommended Wire Size
Recommended Wire Size
14, 16, or 18 AWG (0.75, 1.5 or 2.5 mm
conductor, 600 volt insulation, moisture-resistant
wire
2
22 AWG (0.34 mm ) two-wire twisted pair with
ground, or five-wire.
Remote Reset Module 22 AWG (0.34 mm
twisted pair, insulated for low voltage.
2
22 AWG (0.34 mm ) two-wire twisted pair with
ground.
4
d. Follow directions in the flame detector, Data
ControlBus Module™, Modbus Module or
Remote Reset Module Instructions.
8. KDM wiring: The KDM is powered from a low voltage,
energy limited source so it can be mounted outside
of a control panel if it is protected from mechanical
damage.
NOTE: A separate 13 Vdc power supply must be used any
time more than two Data ControlBus Modules
Modbus Modules or KDM are used or are placed
more than 100 feet (ca. 30 meters) from the relay
module.
9. Maximum wire lengths:
a. 7800 SERIES Relay Module leadwires—The max-
imum length of leadwire is 300 feet (ca. 90
meters) to terminal inputs (Control, Preignition
Interlock, Running/Lockout Interlock, High
Purge Switch and Low Fire Switch).
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 (ca. 300 meters) to a Remote
Reset push-button.
d. Data ControlBus Module and Modbus Module—
The maximum Data ControlBus Module™ or
Modbus Module cable length depends on the
number of system modules connected, the noise
conditions and the cable used. The maximum
length of all interconnecting wire is 4000 feet
(ca. 1200 meters).
10. Make sure loads do not exceed the terminal ratings.
Refer to the label on the 7800 SERIES Relay Module
or to the ratings in Table 3.
Recommended Part Numbers
2
TTW60C, THW75C, THHN90C
) copper
Belden 8723 shielded cable or
equivalent.
2
—
) two-wire
Belden 8723 shielded cable or
equivalent.
,