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RM7897A,C 7800 SERIES
Relay Modules
APPLICATION
The RM7897A,C are microprocessor-based integrated
burner controls for automatically fired gas, oil, or
combination fuel single burner applications. The
RM7897A,C system consist of a relay module, subbase,
amplifier, and purge card. Options include: 2-line VFD (see
document 65-0090) or 4-line LCD (see document 32-
00110) Keyboard Display Module, Data ControlBus™
Module, remote display mounting, Expanded Annunciator
or Modbus module.
Functions provided by the RM7897A,C include automatic
burner sequencing, flame supervision, system status
indication, system or self-diagnostics and
troubleshooting.
The RM7897 adds a proof of closure input to the standard
primary control function of the RM7895/RM7896
product. It adds a blinking fault code function to the
POWER LED on Alarm shutdown. It also adds
programmable postpurge using the S7800A1142
Keyboard Display Module (KDM).
The RM7897A1002 offers selectable pilot operation,
intermittent on terminal 8 or interrupted on terminal 21.
The RM7897C1000 offers interrupted pilot and delayed
main valve for 2-step firing (Low-High-Low) applications.
The RM7897C1018 has 4 second MFEP (main flame
establishing period).
The RM7897C1026 provides a special recycle function for
configuration of Jumper JR2:
—
JR 2 intact: Recycle on loss of flame.
—
JR2 clipped: If flame loss occurs during the first 15
seconds in the Run period, then lockout occurs. If
flame loss occurs after 15 seconds into the Run
period, then recycle.
Factory default for Post Purge time: 15 seconds.
SIL
Capable
3
INSTALLATION INSTRUCTIONS
This document provides installation and static checkout
instructions. Other applicable publications are:
Publication
No.
32-00110
S7800A2142 4-line LCD Keyboard Display
Module Product Data
65-0084
Q7800A,B 22-Terminal Wiring Subbase
Product Data
65-0288
S7800A1142 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 Installation
Instructions
65-0101
S7830 Expanded Annunciator Product Data
65-0109
R7824, R7847, R7848, R7849, R7851,
R7852, 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.
This document covers the following 7800 Series Relay
Modules:
• RM7897A1002
• RM7897A2002
• RM7897C1000
• RM7897C2000
SPECIFICATIONS
Electrical Ratings (See Table 3):
Voltage and Frequency:
RM7897A,C: 120 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).
Product
32-00158-03
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Table of Contents
Related Manuals for Honeywell RM7897A
Summary of Contents for Honeywell RM7897A
- Page 1 The 32-00110 S7800A2142 4-line LCD Keyboard Display RM7897A,C system consist of a relay module, subbase, Module Product Data amplifier, and purge card. Options include: 2-line VFD (see document 65-0090) or 4-line LCD (see document 32-...
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Page 2: Installation
The Q7800 can be mounted directly in the control 4. Loads connected to the RM7897A,C must not cabinet. Be sure to allow adequate clearance for ser- exceed those listed on the RM7897A,C label or the vicing, installation, access or removal of the relay Specifications; see Table 1. -
Page 3: Wiring Subbase
Series 2000 Subbase required. All relay product codes that start with a 2 (example: RM7840G2014/U) can be used with subbase The internal block diagram of the RM7897A,C is shown in Q7800A2005/U. Fig. 1. 1. For proper subbase wiring and sequence chart, refer Subbase Compatibility to Fig. - Page 4 RESET M22727A ALARM Fig. 1. Internal block diagram of RM7897A,C (see Fig. 2 and 3 for detailed wiring instructions). 7. Recommended wire routing of leadwires: d. Follow directions in flame detector, Data a. Do not run high voltage ignition transformer ControlBus™...
- Page 5 SEE FLAME DETECTOR SPECIFICATIONS FOR CORRECT WIRING. AND OVERLOAD PROTECTION AS REQUIRED. PROGRAMMED ON SETUP USING S7800A1142 DISPLAY. DO NOT CONNECT ANY WIRES TO UNUSED TERMINALS. PURGE TIME DEPENDS ON WHICH ST7800 IS INSTALLED. M22728C Fig. 2. Wiring subbase and sequence chart for RM7897A. 32-00158—03...
- Page 6 RM7897A,C 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 RUNNING INTERLOCK (INCLUDING AIRFLOW SWITCH). 10 SEC. INTERRUPTED PILOT/IGNITION PREIGNITION MAIN FUEL VALVE(S) INTERLOCK...
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Page 7: Final Wiring Check
10. Be sure loads do not exceed the terminal ratings. installing the RM7897A,C on the subbase. These tests Refer to the label on the RM7897A,C or to the termi- verify the Q7800 Wiring Subbase is wired correctly, and nal ratings in Table 3. - Page 8 2nd Stage Main Valve (RM7897C) 120 Vac Shutter 120 Vac, 0.5A See Table 2. 2000 VA maximum load connected to RM7897A,C Assembly. See Tables 4 and 5. Table 4. Combinations for Terminals 8, 9, 10 and 21. Interrupted Pilot Valve...
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Page 9: Equipment Recommended
3. For each test, open the master switch and install the 4. Mount the RM7897A,C by aligning the four L- jumper wire(s) between the subbase wiring termi- shaped corner guides and knife blade terminals with nals listed in the Test Jumpers column. - Page 10 RM7897A,C 7800 SERIES RELAY MODULES Table 6. Static Checkout. Test Relay Test Numbe Module Jumper Voltmete If Operation is Abnormal, Model Normal Operation Check Items Listed Below None 5-L2 Line voltage at terminal 5. 1. Master switch. 2. Power connected to master switch.
- Page 11 BA CK ED IT: - EN TE R - M22827 Fig. 4. RM7897A,C Relay Module, exploded view. Setup of Post Purge An S7800A1142, Keyboard Display Module (KDM), is required for the setup of the RM7897 Post Purge Timing, and must be purchased separately.
- Page 12 Fig. 8. Setting Post Purge time. This screen allows for setting up the Postpurge for the RM7897A,C. This will be the time that the Combustion Fan (terminal 4) will remain energized after the call for heat has ended (terminal 6).
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Page 13: Principal Technical Features
Airflow lockout feature is enabled and the airflow switch opens. b. No flame signal at end of PFEP. c. Ignition/pilot valve/intermittent pilot valve ter- minal is not energized. d. Main valve terminal is energized (RM7897A). Edit: e. Delayed (second stage) main valve terminal is energized (RM7897C). M22765B Internal system fault occurred. -
Page 14: Sequence Of Operation
21. The The RM7897A,C has the operating sequences listed RM7897C has an interrupted pilot valve, below; see Fig. 2 and 3. The RM7897A,C LED provide terminal 8. positive visual indication of the program sequence: (2) Flame must be proven by the end of the ten POWER, PILOT, FLAME, MAIN and ALARM. -
Page 15: Settings And Adjustments
RM7897A,C 7800 SERIES RELAY MODULES IMPORTANT safety shutdowns. The Run/Test Switch is ignored during PFEP for the C relay module if terminals Clipping and removing a jumper after 200 hours of 8 and 9 or 9 and 21 are jumpered. - Page 16 RM7897A,C 7800 SERIES RELAY MODULES Table 8. Blinking Fault Codes and Recommended Troubleshooting. Fault Code System Failure Recommended Troubleshooting Code 1-1 Low AC Line 1. Check the relay module and display module connections. *Low AC Line detected. 2. Reset and sequence the Relay Module.
- Page 17 RM7897A,C 7800 SERIES RELAY MODULES Table 8. Blinking Fault Codes and Recommended Troubleshooting. (Continued) Fault Code System Failure Recommended Troubleshooting Code 4-1 No purge card or 1. Make sure the purge card is seated properly. *Purge Card the purge card 2.
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Page 18: Safety And Security
RM7897A,C 7800 SERIES RELAY MODULES Table 8. Blinking Fault Codes and Recommended Troubleshooting. (Continued) Fault Code System Failure Recommended Troubleshooting Code 6-3 Fault with 1. Check wiring and operation of special OEM inputs. *Device special OEM 2. Reset and sequence the relay module. - Page 19 RM7897A,C 7800 SERIES RELAY MODULES 32-00158—03...
- Page 20 RM7897A,C 7800 SERIES RELAY MODULES For More Information The Honeywell Thermal Solutions family of products includes Honeywell Combustion Safety, Eclipse, Exothermics, Hauck, Kromschröder and Maxon. To learn more about our products, visit ThermalSolutions.honeywell.com or contact your Honeywell Sales Engineer. Honeywell Process Solutions...