Final Wiring Check - Honeywell 7800 Series Installation Instructions Manual

7. 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.
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.
8. Keyboard Display Module (KDM): Because the KDM is
powered from a low voltage, energy limited source, it
can be mounted outside of a control panel if it is
protected from mechanical damage.
NOTE: A 13 Vdc power supply must be used any time more
than one Keyboard Display Module is used.
9. Maximum wire lengths follow:
a. RM7845A leadwires—The maximum length of
leadwire is 300 feet to terminal inputs (Control,
Preignition Interlock, Running/Lockout Interlock,
High Fire Switch and Low Fire Switch).
b. Flame Detector leadwires—The maximum flame
sensor leadwire length is limited by the flame signal
strength.
Application
Line voltage terminals
Keyboard Display Module (KDM)
Data ControlBus Module™
Remote Reset Module
Communications Interface ControlBus™
Module
13 Vdc full-wave rectified transformer
power input.
Table 1. Recommended Wire Sizes and Part Numbers.
Recommended Wire Size
14, 16 or 18 AWG copper conductor, 600
volt insulation, moisture-resistant wire.
22 AWG two-wire twisted pair with
ground, or five wire.
22 AWG two-wire twisted pair with
ground, or five wire.
22 AWG two-wire twisted pair, insulated
for low voltage.
22 AWG two-wire twisted pair with
ground.
18 AWG wire insulated for voltages and
temperatures for given application.
3
RM7845A 7800 SERIES RELAY MODULES
c. Remote Reset leadwires—The maximum length of
wire is 1000 feet 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 1000 feet.
10. Make sure loads do not exceed the terminal ratings.
Refer to the label on the RM7845A or to the ratings in
Tables 3, 4 and 5.

Final Wiring Check

1. Check the power supply circuit. The voltage and
frequency tolerance must match those of the
RM7845A. A separate power supply circuit may be
required for the RM7845A. Add the required disconnect
means and overload protection.
2. Check all wiring circuits and complete the Static
Checkout, see Table 8, before installing the
RM7845A on the subbase.
3. Install all electrical connectors.
4. Restore power to the panel.
Recommended Part Number(s)
TTW60C, THW75C, THHN90C.
Belden 8723 shielded cable or equivalent.
Belden 8723 shielded cable or equivalent.
—
Belden 8723 shielded cable or equivalent.
TTW60C, THW75C, THHN90C.
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