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RM7895A RELAY MODULE
32-00122-01
8
3.
For surface mounting, use the back of the subbase
as a template to mark the four screw locations. Drill
the pilot holes.
4.
Securely mount the subbase using four no. 6 screws.
Fig. 4. Internal block diagram of the RM7895 (see Fig. 6 for detailed wiring instructions).
WIRING
IMPORTANT
For proper subbase wiring, refer to Fig. 5.
For proper remote wiring of the Keyboard Display
Module, refer to the Specifications for the Key-
board Display Module (form 65-0144), Communi-
cations Interface Base Unit (63-2278), Data
ControlBus™ Module (65-0091) or Extension
Cable Assembly
(65-0131).
NOTE:
Part number 203541 5-Wire Connector (order
separately) is required except when using the
extension cable assembly.
WARNING
Electrical Shock Hazard.
Can cause severe injury, death or property
damage.
Disconnect the power supply before beginning
installation to prevent electrical shock or
equipment and control damage. More than one
power supply disconnect may be required.
1.
For proper remote wiring of the Keyboard Display
Module, refer to the Specifications for the Keyboard
Display Module (65-0144), Communication Inter-
face Base Unit (63-2278), Data ControlBus™ Module
(65-0091) or Extension Cable Assembly (65-0131).
2.
Disconnect the power supply from the main discon-
nect before beginning installation to prevent electri-
cal shock and equipment damage. More than one
disconnect may be involved.
3.
All wiring must comply with applicable electrical
codes, ordinances and regulations. Wiring, where
required, must comply with NEC Class 1 (Line Volt-
age) wiring.
4.
Recommended wire size and type: see Table 4.
5.
Recommended grounding practices: see Table 5.
6.
The Keyboard Display Module, Data ControlBus™
Module (for remote mounting or communications)
or Communication Interface ControlBus Module
must be wired in a daisy chain configuration, (1(a)-
1(a),
2(b)-2(b), 3(c)-3(c)). The order of interconnection of
all the devices listed above is not important. Be
aware that modules on the closes and farthest end
of the daisy chain configuration string require a
120-ohm, 1/4 watt minimum, resistor termination
across terminals 1 and 2 of the electrical connectors,
for connections over 100 feet. Recommended wire
routing of leadwires:
CONFIGURATION
JUMPERS
MICROCOMPUTER
RESET
PUSHBUTTON
RUN/TEST
SWITCH
STATUS LEDs
PLUG-IN PURGE
TIMER CARD
SAFETY RELAY
CIRCUIT
POWER SUPPLY
OPTIONAL KEYBOARD
DISPLAY MODULE
PLUG-IN
FLAME
AMPLIFIER
RELAY
DRIVE
CIRCUIT
CONTROL
POWER
TEST
JACK
REMOTE
RESET
DDL
DDL
COMMUNICATIONS
INDICATES FEEDBACK SENSING
TO RELAY STATUS FEEDBACK
AND LINE VOLT INPUTS
FIELD WIRING
INTERNAL WIRING
IGNITION
PILOT
MAIN VALVE
1K
RELAY
STATUS
FEEDBACK
AND LINE
VOLTAGE
INPUTS
LIMITS
CONTROLLER
LOCKOUT
INTERLOCK
(INCLUDING
AIRFLOW SWITCH)
1K1
2K1 5K1
FLAME SIGNAL
TEST
PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
RS485
1
2
3
L1
(HOT)
L2
5
6
7
4K1
2K2
10
8
9
7K
6K
5K
4K
3K
2K
F
G
22
1
BLOWER
6K1
4
ALARM
3K1
3
L2
M5110G
1
RM7895, RM7896: 120 VAC, 50/60 HZ.
EC7895A,C: 220-240 VAC, 50/60 HZ.