RM7895A RELAY MODULE
32-00122-01
2
• Burner controller data (optional):
—
Expanded annunciator status.
—
Flame signal strength.
—
Hold status.
—
Lockout/alarm status.
—
Sequence status.
—
Sequence time.
—
Total cycles of operation.
—
Total hours of operation.
—
Fault history providing for the six most recent
faults:
• Cycles of operation at the time of the fault.
• Expanded annunciator data at the time of the
fault.
• Fault message and code.
• Hours of operation at the time of the fault.
• Sequence status at the time of the fault.
• Sequence time at the time of the fault.
—
Diagnostic information:
• Device type.
• Flame amplifier type.
• Flame failure response time.
• Manufacturing code.
• On/Off status of all digital inputs and outputs.
• Selected prepurge time.
• Software revision and version of RM7895 and
optional Keyboard Display Module.
• Status of configuration jumpers.
SPECIFICATIONS
Model:
RM7895A Relay Module. Provides primary control.
Provides automatic burner sequencing, flame
supervision, system status indication, system or self-
diagnostics and troubleshooting. Intermittent pilot
valve operation.
Electrical Ratings (see Table 1):
Voltage and Frequency:
120 Vac (+10/-15%), 60 Hz (±10%).
Power Dissipation: 10W maximum.
Maximum Total Connected Load: 2000 VA.
Fusing: Total Connected Load: 15A maximum, Type SC or
equivalent, fast blow.
Table 1. Terminal Ratings.
a
The RM7895 must have an earth ground providing a connection between the subbase and the control panel or
equipment. The earth ground wire must be capable of conducting the current to blow the 15A fuse (or breaker) in event
of an internal short circuit. The 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 maximum surface areas. Wide straps or brackets,
rather than leadwires, are preferred. 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 are
protected against mating surface corrosion.
b
2000 VA maximum connected load to RM7895 Assembly.
c
Can also be 120 Vac, 1A pilot duty.
d
Can also be 65 VA pilot duty with motorized valve, 1150 VA inrush, 460 VA open, 250 VA hold.
Environmental Ratings:
Ambient Temperature:
Operating: -40°F to +140°F (-40°C to +60°C).
Storage: -40°F to +150°F (-40°C to +66°C).
Humidity: 85% rh continuous, noncondensing.
Vibration: 0.5G environment.
Dimensions:
See Fig. 1.
Weight:
RM7895 with dust cover: 1 pound, 15 ounces
(0.87 kg).
Terminal Number
Description
Ratings
G
Flame Sensor Ground
—
Earth G
Earth Ground
a
—
L2(N)
Line Voltage Common
—
3
Alarm
120 Vac, 1A pilot duty.
4
Burner Motor
120 Vac, 9.8 AFL, 58.8 ALR (inrush).
5
Line Voltage Supply (L1)
120 Vac (+10/-15%), 50 or 60 Hz (±10%)
b,c
.
6
Burner Control and Limits
120 Vac, 1mA.
7
Airflow Interlock
120 Vac, 9A.
8
Pilot Valve/Ignition
120 Vac, 4.5A ignition and 50 VA pilot duty
c
.
9
Main Fuel Valve
120 Vac, 2A pilot duty
d
.
10
Ignition
120 Vac, 4.5A ignition
c
.
(F)11
Flame Sensor
60 to 220 Vac, current limited.
12 to 21
Unused
—
22
Shutter
120 Vac, 0.5A.
