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Honeywell RM7895A Installation Instructions Manual

7800 series relay modules.
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APPLICATION
The RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D are
microprocessor-based integrated burner controls for
automatically fired gas, oil, or combination fuel single burner
applications. They are intended to replace the R4795 and
R7795 Primary Controls. The RM7895A,B,C,D/EC7895A;
RM7896A,B,C,D systems consist of a relay module, subbase,
amplifier, and purge card. Options include keyboard display
module (KDM), Personal Computer Interface, Data
ControlBus™ Module, remote display mounting, expanded
annunciator and Combustion System Manager® Software.
Functions provided by the RM7895A,B,C,D/EC7895A,C;
RM7896A,B,C,D include automatic burner sequencing,
flame supervision, system status indication, system or
self-diagnostics and troubleshooting. The RM7896 provides
a postpurge function.
This document provides installation and static checkout
instructions. Other applicable publications are:
Publication
No.
63-2278
Q7700 Network Interface Unit Product Data
65-0084
Q7800A,B 22-Terminal Wiring Subbase
Product Data
65-0090
S7800A Keyboard Display Module Product
Data
65-0091
S7810A Data ControlBus Module™ Product
Data
65-0095
S7820 Remote Reset Module Product Data
65-0097
221729C Dust Cover Packing Instructions
65-0101
S7830 Expanded Annunciator Product Data
65-0102
ZM7850A Combustion System Manager™
Operating Instructions
65-0109
R7824, R7847, R7848, R7849, R7851,
R7861, R7886 Flame Amplifiers for the
7800 Series Product Data
65-0131
221818A Extension Cable Assembly
Product Data
65-0229
7800 SERIES Relay Modules Checkout and
Troubleshooting Product Data.
65-0092
QS7800A ControlBus™ Module, Standard
65-0227
QS7800B ControlBus™ Module, Multidrop
® U.S. Registered Trademark
Copyright © 2003 Honeywell International Inc.
All Rights Reserved
RM7895A,B,C,D/EC7895A,C;
7800 SERIES Relay Modules
Product
RM7896A,B,C,D
INSTALLATION INSTRUCTIONS
SPECIFICATIONS
Electrical Ratings (See Table 3):
Voltage and Frequency:
RM7895/RM7896: 120 Vac (+10/-15%), 50/60 Hz (± 10%).
EC7895A,C: 220/240 Vac (+10%/-15%), 50/60 Hz (±10%)
Power Dissipation: 10W maximum.
Maximum Total Connected Load: 2000 VA.
Fusing Total Connected Load: 15A Fast Blow, type SC or
equivalent.
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% relative humidity continuous, noncondensing.
Vibration: 0.5G environment.
Approvals:
RM7895/RM7896:
Underwriters Laboratories Inc. Listed: File No. MP268,
Guide No. MCCZ.
Canadian Standards Association Certified: LR9S329-3.
Factory Mutual Approved: Report No. J.I.1V9A0.AF.
IRI Acceptable.
Federal Communications Commission: Part 15, Class B,
Emissions.
EC7895A,C:
Factory Mutual Approved.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
condition.
2. Check the ratings given in the instructions and marked
on the product to make sure the product is suitable for
the application.
3. Installer must be a trained, experienced, flame
safeguard service technician.
4. After installation is complete, check out the product
operation as provided in these instructions.
66-1090-4

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Table of Contents

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   Summary of Contents for Honeywell RM7895A

  • Page 1 RM7895/RM7896: 120 Vac (+10/-15%), 50/60 Hz (± 10%). applications. They are intended to replace the R4795 and EC7895A,C: 220/240 Vac (+10%/-15%), 50/60 Hz (±10%) R7795 Primary Controls. The RM7895A,B,C,D/EC7895A; Power Dissipation: 10W maximum. RM7896A,B,C,D systems consist of a relay module, subbase, Maximum Total Connected Load: 2000 VA.
  • Page 2 RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 7800 SERIES RELAY MODULES Location WARNING Fire or Explosion Hazard. Humidity Can cause property damage, severe injury, or Install the relay module where the relative humidity never death. reaches the saturation point. The relay module is designed to...
  • Page 3 IGNITION CONTROLLER LOCKOUT LIMITS INTERLOCK PILOT (INCLUDING AIRFLOW SWITCH) OPTIONAL KEYBOARD DISPLAY MODULE MAIN VALVE RS485 BLOWER REMOTE COMMUNICATIONS RESET ALARM M5110G Fig. 1. Internal block diagram of RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D (see Fig. 2 and 3 for detailed wiring instructions). 66-1090—4...
  • Page 4 AIRFLOW SWITCH CHECK FEATURE IS FOR THE RM7895B,RM7896B. FOR EC7895, A 220 TO 240 VAC TO 120 VAC, 10 VA MINIMUM STEPDOWN TRANSFORMER (NOT PROVIDED) MUST BE USED TO DRIVE THE SHUTTER. RM7896A,B ONLY. M15123A Fig. 2. Wiring subbase and sequence chart for RM7895A,B/EC7895A; RM7896A,B. 66-1090—4...
  • Page 5 RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 7800 SERIES RELAY MODULES Q7800 FOR DIRECT SPARK IGNITION (OIL OR GAS) IGNITION TRANSFORMER LINE VOLTAGE ALARM MAIN VALVE BURNER MOTOR (BLOWER) (L1) BURNER CONTROLLER/LIMITS LOCKOUT INTERLOCK (INCLUDING AIRFLOW SWITCH). 10 SEC. INTERRUPTED PILOT/IGNITION MAIN FUEL VALVE(S) DELAYED...
  • Page 6 RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 2. Check all wiring circuits and complete Static Checkout leadwires: The maximum leadwire length is 300 feet in Table 6 before installing the RM7895A,B,C,D/ to terminal inputs (Control, Running/Lockout EC7895A,C; RM7896A,B,C,D on the subbase. Interlock).
  • Page 7 120 Vac, 0.5A 220-240 Vac See Table 2. 2000 VA maximum load connected to RM7895A,B,C,D/EC7895A,C/RM7896A,B,C,D Assembly. See Tables 4 and 5. Requires 220-240 Vac, 10 VA minimum, stepdown transformer to operate the shutter. Table 4. Combinations for Terminals 8, 9, 10 and 21.
  • Page 8 RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 7800 SERIES RELAY MODULES STATIC CHECKOUT Equipment Recommended 1. Voltmeter (1M ohm/volt minimum sensitivity) set on the 0 to 300 Vac scale. After checking all wiring, perform this checkout before 2. Two jumper wires, no. 14 wire, insulated, 12 in.
  • Page 9 RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 7800 SERIES RELAY MODULES Table 6. Static Checkout. Test Relay Module Test If Operation is Abnormal, Number Model Jumpers Voltmeter Normal Operation Check Items Listed Below — 1. Ignition spark (if ignition 1. Watch for spark or listen for buzz.
  • Page 10 SCREW COVER FLAME AMPLIFIER M15122 Fig. 4. RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D Relay Module, exploded view. 2. STANDBY PERIOD 4. PILOT FLAME ESTABLISHING PERIOD (PFEP) a. Airflow lockout feature is enabled and the airflow a. Airflow lockout feature is enabled and the airflow switch does not close after ten seconds or within the switch opens.
  • Page 11 RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 7800 SERIES RELAY MODULES Standby 5. MAIN FLAME ESTABLISHING PERIOD (MFEP) (RM7895C,D) The EC7895A,C/RM7895A,B,C,D;RM7896A,B,C,D is ready a. Airflow lockout feature is enabled and the airflow to start an operating sequence when the operating control switch opens. input determines a call for heat is present. The burner switch, b.
  • Page 12 RM7895A,B,C,D/EC7895A,C; RM7896A,B,C,D 7800 SERIES RELAY MODULES SETTINGS AND ADJUSTMENTS 1. The EC7895C, RM7895C,D, RM7896C,D has a delayed main valve that is energized once the RUN Selectable Site-Configurable Jumpers period is entered. 2. The relay module is now in RUN and remains in RUN...

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