RELAY MODULES WITH VALVE PROVING
32-00142—01 4
1. For proper subbase wiring, refer to Figs. 3, 4, 6, 7, or
Appendix B.
2. For proper remote wiring of the Keyboard Display
Module, through a 203541 5-wire Connector, refer
to the Specifications for the Keyboard Display
Module
(65-0288), 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. Wiring, where
required, must comply with NEC, Class 1 (Line Volt-
age) wiring.
5. Recommended wire size and type: see Table 1.
6. Recommended grounding practices: see Table 2.
Keyboard Display Module and/or Data
Controlbus Module is powered from internally
fused low voltage source and shares the voltage
supply with Relay Module. The fuse is non-
replaceable. Excessive current draw or short at
display connection may cause fuse to blow out
resulting in dead, unpowered system.
The Keyboard Display Module, Data ControlBus Module™
(for remote mounting or communications), through a
203541 5-wire Connector 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 connections over 100 feet.
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 Control-
bus Module™, or Remote Reset Module Instruc-
tions.
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. RM7800L/40G,L, EC7840L leadwires—The maxi-
mum length of leadwire is 300 feet to terminal
inputs (Control, Pre-Ignition Interlock, Run-
ning/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.
c. Remote Reset leadwires—The maximum length
of wire is 1000 feet to a Remote Reset pushbut-
ton.
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 maxi-
mum 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
RM7800/RM7840/EC7840L or to the ratings in
Tables 3, 4 and 5.
Final Wiring Check
1. Check the power supply circuit. The voltage and fre-
quency tolerance must match those of the
RM7800L/40G,L, EC7840L. A separate power sup-
ply circuit may be required for the
RM7800/RM7840/EC7840L. Add the required dis-
connect means and overload protection.
2. Check all wiring circuits and complete the Static
Checkout, see Table 9, before installing the
RM7800L/40G,L, EC7840L on the subbase.
3. Install all electrical connectors.
4. Restore power to the panel.
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