Honeywell 7800 SERIES EC7895A, RM7895A Relay Module Manual

7800 SERIES EC7895A, RM7895A Relay Module Manual

GENERAL

The Yamatake Honeywell EC7895A and RM7895 is a microprocessor based integrated burner control for automatically fired gas, oil, or combination fuel single burner applications. The RM7895 consists of the Relay Module. Subbase, Amplifier and Purge Card. Options include Keyboard Display Module, Personal Computer Interface, DATA CONTROLBUS MODULE™, Remote Display Module, and COMBUSTION SYSTEM MANAGER™ Software. The EC7895 and RM7895 are programmed to provide a level of safety, functional capability and features beyond the capacity of conventional controls. Functions provided by the EC7895 and RM7895 include automatic burner sequencing, flame supervision, system status indication, system or self-diagnostics and troubleshooting.

Honeywell 7800 SERIES FEATURES

• Safety features:
  • Airflow switch 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.
• Application flexibility.
• Communication interface capability

Honeywell 7800 SERIES Product Data

1. Dependable, long-term operation provided by microcomputer technology.
2. First-out annunciation and system diagnostics provided by a 2 row by 20 column Vacuum Fluorescent Display (VFD) located on the optional Keyboard Display Module.
3. Five (LEDs) for sequence information.
4. Interchangeable plug-in flame amplifiers.
5. Local or remote annunciation of EC7895 and RM7895 operation and fault information.
6. Nonvolatile memory; EC7895 and RM7895 retain history files and sequencing status after loss of power.
7. Remote reset (optional).
8. Report generation (optional).
9. Selectable recycle or lockout on loss of airflow.
10. Selectable recycle or lockout on loss of flame.
11. Shutter drive output.
12. Burner controller data (optional):
    1. Flame signal strength.
    2. Hold status.
    3. Lockout/alarm status.
    4. Sequence status.
    5. Sequence time.
    6. Total cycles of operation.
    7. Total hours of operation.
    8. Fault history providing for the six most recent faults:
       1. Cycles of operation at the time of the fault.
       2. Fault message and code.
       3. Hours of operation at the time of the fault.
       4. Sequence status at the time of the fault.
       5. Sequence time at the time of the fault.
    9. Diagnostic information:
       1. Device type.
       2. Flame amplifier type.
       3. Flame failure response time.
       4. Manufacturing code.
       5. On/Off status of all digital inputs and outputs.
       6. Selected prepurge time.
       7. Software revision and version of EC7895 and RM7895 and optional Keyboard Display Module.
       8. Status of configuration jumpers.

Contents

General ......................................................................................... 1
Features ........................................................................................ 1
Specifications ................................................................................ 2
Ordering Information ..................................................................... 2
Principal Technical Features ......................................................... 8
Safety Provisions .......................................................................... 8
Installation ..................................................................................... 9
Wiring ............................................................................................ 11
Assembly ...................................................................................... 14
Operation ...................................................................................... 17
Checkout ....................................................................................... 20
Troubleshooting ............................................................................ 26

SPECIFICATIONS

Model: RM7895A

Electrical Ratings, see Table 1A:

• Voltage and Frequency: 100 Vac (+10/-15%), 50 or 60 Hz (+/- 10%). 1
• Power Dissipation: RM7895: 10W maximum.
• Maximum Total Connected Load: 2000 VA.
• Fusing Total Connected Load: 20A maximum, type FRN or equivalent.

Table 1A. RM7895A Terminal Ratings.

1. Range of allowable operating frequency: 45 to 66 Hz.
2. The 7895 must have an earth ground providing a connection between the subbase and the control panel or the equipment. The earth ground wire must be capable of conducting the current to blow the 20A fuse (or breaker) in event of an internal short circuit. The 7895 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.
3. 2000 VA maximum connected load to 7895 Assembly.
4. Can also be 100 Vac, 1A pilot duty.
5. Can also be 65 VA pilot duty with motorized valve, 1150 VA inrush, 460 VA open, 250 VA hold.

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number. If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:

1. Your local Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Relations

Honeywell, 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

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