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3
DDL
COMMUNICATIONS
FIELD WIRING
INTERNAL WIRING
1
PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
OUTPUTS SHOWN ARE WHEN THE
DEVICE DOES NOT SENSE FLAME.
Fig. 1. Internal block diagram of the EC/RM7823A (See Fig. 6 for detailed wiring instructions).
Application
Line voltage terminals
Keyboard Display Module 22 AWG two-wire twisted pair with ground, or five wire. Belden
Data ControlBus Module™ 22 AWG two-wire twisted pair with ground, or five wire. Belden
Remote Reset Module
Communications Interface
ControlBus Module
13 Vdc full-wave rectified
transformer power input.
Ground Type
Earth ground
1. Use to provide a connection between the subbase and the control panel of the equipment. Earth ground
(subbase and
must be capable of conducting enough current to blow the 15A fast acting fuse (or breaker) in the event of an
relay module).
internal short circuit.
2. Use wide straps or brackets to provide minimum length, maximum surface area ground conductors. If a
leadwire must be used, use 14 AWG copper wire.
3. Make sure that mechanically tightened joints along the ground path are free of nonconductive coatings and
protected against corrosion on mating surfaces.
MICROCOMPUTER
RESET
PUSHBUTTON
STATUS
LEDs
OPTIONAL KEYBOARD
DDL
DISPLAY MODULE
RS485
1
5
2
REMOTE
3
RESET
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, insulated for low voltage. —
22 AWG two-wire twisted pair with ground.
18 AWG wire insulated for voltages and temperatures
for given application.
Table 2. Recommended grounding practices.
EC7823A;RM7823A 7800 SERIES RELAY MODULES
L1
L2
(HOT)
1
120 Vac/220-240 Vac,
50/60 Hz
FLAME SIGNAL
PLUG-IN
TEST
FLAME
AMPLIFIER
RELAY
DRIVE
9K
CIRCUIT
POWER SUPPLY
A1
A2
B1
B2
9K
Recommended Practice
3
L2
TEST
JACK
F
G
22
CONTROL
POWER
2
10
NC
8
COMMON
9
NO
14
NC
13
COMMON
15
NO
M15079A
Recommended Part Numbers
TTW60C, THW75C, THHN90C.
®
8723 shielded cable or equivalent.
®
8723 shielded cable or equivalent.
®
Belden
8723 shielded cable or equivalent.
TTW60C, THW75C, THHN90C.
66-1086—2
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