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7800 SERIES RM7824A RELAY MODULE
3
RESET
PUSHBUTTON
STATUS LEDs
LIMITS CONTROLLER
DDL
DDL
COMMUNICATIONS
1
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 6. Internal block diagram of the RM7824A (see Fig. 6 for detailed wiring instructions).
ASSEMBLY
Mounting Rm7824A
NOTE: For installation dimensions, see Fig. 1 or 2.
Relay Module Mounting
1. Mount the RM7824A vertically, see Figs. 8 or 9, or
mount horizontally with the knife blade terminals
pointing downward. When mounted on the Q7800A, the
RM7824A must be in an electrical enclosure.
2. Select the location in the electrical enclosure. Be sure to
allow adequate clearance for servicing, installation and
removal of the RM7824A, dust cover, flame amplifier,
flame amplifier signal voltage probes, electrical signal
voltage probes and electrical connections.
65-0155—2
CONFIGURATION
JUMPERS
MICROCOMPUTER
RELAY
DRIVE
CIRCUIT
SAFETY RELAY
CIRCUIT
1K1
6
3K1
OPTIONAL KEYBOARD
DISPLAY MODULE
RS485
1
2
3
REMOTE
RESET
+
–
1
24 VDC
FLAME SIGNAL
PLUG-IN
FLAME
AMPLIFIER
TEST
2K
3K
RELAY
4K
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS
1K
CONTROL
POWER SUPPLY
POWER
4K1
2K1
10
8
2K2
9
4
INDICATES FEEDBACK SENSING
TO RELAY STATUS FEEDBACK
AND LINE VOLT INPUTS
FIELD WIRING
INTERNAL WIRING
a. Allow an additional two inches below the RM7824A
for the flame amplifier mounting.
b. Allow an optional three-inch minimum to both sides
of the RM7824A for electrical signal voltage probes.
3. Make sure no subbase wiring is projecting beyond the
terminal blocks. Tuck in wiring against the back of the
subbase so it does not interfere with the knife blade
terminals or bifurcated contacts.
IMPORTANT
The RM7824A must be installed with a plug-in
motion rather than a hinge action.
4. Mount the RM7824A by aligning the four L-shaped
corner guides and knife blade terminals with the
bifurcated contacts on the wiring subbase and securely
tightening the two screws. Do not tighten the screws to
the point where they deform the plastic of the RM7824A
case.
8
L2
TEST
JACK
F
G
22
IGNITION
PILOT
MAIN VALVE
ALARM
M5821
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