Table of Contents
Advertisement
RM7897A,C 7800 SERIES RELAY MODULES
1
PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
RM7897A-INTERMITTENT PILOT.
RM7897C-INTERRUPTED PILOT.
3
RM7897A-INTERRUPTED PILOT.
RM7897C-DELAYED MAIN VALVE.
INDICATES FEEDBACK SENSING
TO RELAY STATUS FEEDBACK
AND LINE VOLT INPUTS
FIELD WIRING
INTERNAL WIRING
OPTIONAL KEYBOARD
DISPLAY MODULE
DDL
DDL
COMMUNICATIONS
M22727A
Fig. 1. Internal block diagram of RM7897A,C (see Fig. 2 and 3 for detailed wiring instructions).
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.
32-00158—03
5
RUN/TEST
SWITCH
RESET
PUSHBUTTON
STATUS LEDs
LIMITS
PREIGNITION
RS485
INTERLOCK
1
6K1
2
REMOTE
3
RESET
3K1
120 VAC,
50/60 HZ
L1
(HOT)
1
CONFIGURATION
JUMPERS
MICROCOMPUTER
2K
3K
RELAY
DRIVE
4K
CIRCUIT
5K
6K
7K
SAFETY RELAY
1K
CIRCUIT
POWER SUPPLY
7
6
CONTROLLER
LOCKOUT
INTERLOCK
(INCLUDING
AIRFLOW SWITCH)
20
d. Follow directions in flame detector, Data
ControlBus™ Module, or Remote Reset Module
Instructions.
8. The KDM is powered from a low voltage, energy lim-
ited 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 KDM is used.
4
L2
PLUG-IN PURGE
TIMER CARD
TEST
FLAME SIGNAL
JACK
F
PLUG-IN
TEST
G
FLAME
AMPLIFIER
22
RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS
CONTROL
POWER
1K1
2K1 5K1
10
IGNITION
4K1
8
PILOT
2K2
9
MAIN VALVE
7K16
21
4
BLOWER
3
ALARM
L2
2
3
Advertisement
Table of Contents
