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Troubleshooting - Honeywell 7800 Series Installation Instructions Manual

Relay modules
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RM7897A1002, RM7897C1000 7800 SERIES RELAY MODULES
SELECTABLE CONFIGURATION JUMPERS
Fig. 15. Selectable site-configurable jumpers.
Fault Code
System Failure
Code 1-1
Low AC Line detected.
*Low AC Line
Voltage*
Code 1-2
Excessive noise or
*AC Quality
device running on slow,
Problem*
fast, or AC line dropout
detected.
Code 2-1
Flame sensed when no
*Unexpected
flame is expected during
Flame Signal*
STANDBY or PURGE.
Code 2-2
No-flame time present
*Flame Signal
at the end of the PIlot
Absent*
Flame Establishing
Period; lost during the
Main Flame Establishing
Period or during RUN.
66-1151
RUN/TEST SWITCH
(EC7895C; RM7895C,D; RM7896C,D)
M7553A
Table 8. Blinking Fault Codes and Recommended Troubleshooting.
1. Check the relay module and display module connections.
2. Reset and sequence the Relay Module.
3. Check the 7800 power supply and make sure that frequency and voltage meet
specifications.
4. Check the backup power supply, as appropriate.
1. Check that flame is not present in the combustion chamber; correct any errors.
2. Make sure that the flame amplifier and flame detector are compatible.
3. Check the wiring and correct any errors.
4. Remove the flame amplifier and inspect its connections. Reseat the amplifier.
5. Reset and sequence the relay module.
6. If the code reappears, replace the flame amplifier and/or the flame detector.
7. If the fault persists, replace the relay module.
1. Measure the flame signal. If one exists, verify that it meets specifications.
2. Make sure that the flame amplifier and flame detector are compatible.
3. Inspect the main fuel valve(s) and valve connection(s).
4. Verify that the fuel pressure is sufficient to supply fuel to the combustion
chamber. Inspect the connections to the fuel pressure switches. Make sure
they are functioning properly.
5. Inspect the Airflow Switch and make sure that it is functioning properly.
6. Check the flame detector sighting position; reset and recycle. Measure the
flame signal strength. Verify that it meets specifications. If not, refer to the
flame detector and/or flame amplifier checkout procedures in the installation
instructions.
7. Replace the flame amplifier and/or the flame detector, if necessary.
8. If the fault persists, replace the relay module.
Table 7. Site-configurable jumper options.
Jumper
Number
JR1
Pilot Flame Establishing
Period (PFEP)
JR2
Flame Failure Action
JR3
Airflow Switch (ILK) Failure

TROUBLESHOOTING

The POWER LED provides fault identification when the Relay
Module locks out on an alarm. Fault identification is a series of
fast- and slow-blinking LED lights. The fast blinks identify the
tens portion of the fault code (three fast blinks is 30), while the
slow blinks identify the units portion of the fault code (two slow
blinks is 2). Three fast blinks followed by two slow blinks
would be fault code 32. This identifies a running interlock on
during STANDBY. (See Table 8 for Blinking Fault Code List.)
The LED code repeats as long as the fault exists. To clear the
fault, press the RESET button.
Recommended Troubleshooting
14
Description
Intact
10
seconds
Recycle Lockout
Recycle Lockout
Clipped
4
seconds

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