7800 SERIES EC7885A/RM7885A RELAY MODULE
65-0203
15
Fig. 11. 7885A wiring with R4155 alarm silencing relay.
5. Recommended grounding practices:
a.
Use the earth ground to provide a connection
between the subbase and the control panel or
the equipment. The earth ground wire must be
capable of conducting the current to blow the
20A fuse in event of an internal short circuit. The
7885A requires a low impedance ground
connection to the equipment frame which, in
turn, requires a low impedance connection to
earth ground. For a ground path to be low
impedance at RF frequencies, the connection
must be made with minimum length conductors
that have a maximum surface area. Wide straps
or brackets are preferred rather than leadwires.
Be careful to verify that mechanically tightened
joints along the ground path, such as pipe or
conduit threads or surfaces held together with
fasteners, are free of nonconductive coatings
and have protected against corrosion on mating
surfaces.
1. For proper wiring of optional Keyboard Display Module
mounted remotely, DATA CONTROLBUS MODULE™,
Remote Reset Module or Communication Interface
Base Unit, refer to Specifications, forms 65-0090, 65-
0091, 65-0095 or 63-2278, respectively.
2. Disconnect the power supply from the main disconnect
before beginning installation to prevent electrical shock
and equipment damage. More than one disconnect may
be involved.
3. All wiring must comply with all appropriate electrical
codes, ordinances and regulations. Wiring, where
required, must comply with NEC Class 1 (Line Voltage)
wiring.
4. Recommended wire size and type: use no. 14, 16, or 18
copper conductor wire (TTW60C or THW75C or
THHN90C), 600 volt insulation wire for all line voltage
terminals. For high temperature installations, use wire
selected for a temperature rating above the maximum
operating temperature. All leadwires must be moisture
resistant.
M11178
G
L2
3
5
6
7
8
9
10
F
(L1)
13
14
15
16
17
18
19
20
21
22
12
MASTER
SWITCH
IGNITION
MAIN FUEL
VALVE(S)
INTERMITTENT
PILOT
100V, 50 OR 60 HZ. (RM7885); 200V, 50 OR 60 HZ (EC7885) POWER SUPPLY.
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS.
100V ALARM (RM7885); 200V ALARM (EC7885).
FOR DIRECT SPARK IGNITION
(OIL OR GAS)
ALARM
L1
(HOT)
L2
9
8
MAIN VALVE
Q7800
L2
4
1
2
3
3
2
1
LIMITS
STOP
S445A
START-STOP
STATION
START
B
A
D
C
INTERNAL
JUMPER
