Wiring - Honeywell 7800 SERIES EC7895A Product Data

5
RESET
PUSHBUTTON
STATUS LEDs
LIMITS CONTROLLER
DDL
DDL
COMMUNICATIONS
1 PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2
RM7895:,100VAC; EC7895: 200VAC.
Fig. 6. Internal block diagram of the EC7895 or RM7895 (see Fig. 7 and 8 for detailed wiring instructions).

WIRING

1. a. For proper wiring, refer to Fig. 7 or 8.
b. For proper remote wiring of the Keyboard Display
Module, refer to the Specifications for the Keyboard
Display Module (65-0090), Communication Interface
Base Unit (63-2278), DATA CONTROLBUS
MODULE™ (65-0091) or Extension Cable Assembly
(65-0131).
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 (TTW60C or THW75C or THHN90C)
600 volt insulation wire for all Line Voltage terminals. For
high temperature installations, use wire selected for a
CONFIGURATION
JUMPERS
RUN/TEST
SWITCH
MICROCOMPUTER
RELAY
DRIVE
CIRCUIT
SAFETY RELAY
CIRCUIT
LOCKOUT
INTERLOCK
6
6K1
3K1
OPTIONAL KEYBOARD
DISPLAY MODULE
RS485
1 5
2
REMOTE
3
RESET
7800 SERIES EC7895A, RM7895A RELAY MODULE
L1
(HOT) L2
1
2
PLUG-IN PURGE
TIMER CARD
FLAME SIGNAL
PLUG-IN
FLAME
AMPLIFIER
TEST
2K
3K
RELAY
STATUS
4K
FEEDBACK
5K
AND LINE
6K
VOLTAGE
INPUTS
7K
1K
CONTROL
POWER SUPPLY
POWER
1K1 2K1 5K1
7 10
4K1
8
7K1
21
2K2
9
4
3
INDICATES FEEDBACK SENSING
OF RELAY CONTACT STATUS
AND LINE VOLTAGE INPUTS
FIELD WIRING
INTERNAL WIRING
temperature rating above the maximum operating
temperature. All leadwires must be moisture resistant.
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 (or
breaker) in event of an internal short circuit. The
EC7895 or RM7895 needs a low impedance
ground connection to the equipment frame which,
in turn, needs 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 noncon-
ductive coatings and are protected against mating
surface corrosion.
11
L2
TEST
JACK
F
G
22
IGNITION
PILOT
PILOT/V2
MAIN VALVE
BLOWER
ALARM
M11128
65-0205