Functions provided by the Relay Module include automatic burner sequencing, flame supervision, system status indication, system or self-diagnostics and troubleshooting. The RM7896 also provides 15 seconds postpurge.
FEATURES
• Safety features:
- Interlock check.
- Closed loop logic test.
- Dynamic AMPLI-CHECK®.
- Dynamic input check.
- Dynamic safety relay test.
- Dynamic self-check logic.
- Internal hardware status monitoring.
- Tamper resistant timing and logic.
• Access for external electrical voltage checks.
• Airflow switch check feature (RM7895B,D/RM7896B,D).
• Application flexibility.
• Communication interface capability.
• Delayed main valve (EC7895C; RM7895C,D; RM7896C,D).
• The EC7895/RM7895/RM7896 provides either 0.8 or 3 second Flame Failure Response Time (FFRI), depending on the amplifier selected.
• Dependable, long-term operation provided by microcomputer technology.
• First-out annunciation and system diagnostics are provided by a 2 row by 20 column Vacuum Fluorescent Display (VFD) located on the optional Keyboard Display Module.
• First-out expanded annunciation with 26 Light Emitting Diodes (LED) for limits and interlocks (optional).
• Five (LED) for sequence information, see Fig. 1.
• Two function Run/Test Switch (EC7895C; RM7895C,D; RM7896C,D).
• Interchangeable plug-in flame amplifiers.
• Local or remote annunciation of EC7895/RM7895 and RM7896 operation and fault information (optional).
• Nonvolatile memory; retains history files and
sequencing status after loss of power.
• Report generation (optional).
• Remote reset (optional).
• Selectable recycle or lockout on loss of airflow.
• Selectable recycle or lockout on loss of flame.
• Shutter drive output.
• 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 EC7895/RM7895/RM7896 and optional Keyboard Display Module.
• Status of configuration jumpers.
• Status of Run/Test Switch (EC7895C/RM7895C,D/RM7896C,D).
SPECIFICATIONS
Electrical Ratings, see Table 1:
Voltage and Frequency:
EC7895A,C: 220 to 240 Vac (+10/-15%), 50 or 60 Hz (±10%).
RM7895/RM7896: 120 Vac (+10/-15%), 50 or 60 Hz (+/- 10%).
Power Dissipation:
EC7895/RM7895/RM7896: 10W maximum. Maximum Total Connected Load: 2000 VA.
Fusing: Total Connected Load: 20A maximum, fast-acting fuse.
Environmental Ratings:
Ambient Temperature:
Operating: -40°F to +140°F (-40°C to +60°C).
Storage: -60°F to +150°F (-40°C to +66°C).
Humidity: 85% RH continuous, noncondensing.
Vibration: 0.5G environment.
Weight: 1 pound 13 ounces, unpacked.
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