RM7897A1002, RM7897C1000 7800 SERIES RELAY MODULES
66-1151 14
Fig. 15. Selectable site-configurable jumpers.
Table 7. Site-configurable jumper options.
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.
RUN/TEST SWITCH
(EC7895C; RM7895C,D; RM7896C,D)
SELECTABLE CONFIGURATION JUMPERS
M7553A
Jumper
Number Description Intact Clipped
JR1 Pilot Flame Establishing
Period (PFEP)
10
seconds
4
seconds
JR2 Flame Failure Action Recycle Lockout
JR3 Airflow Switch (ILK) Failure Recycle Lockout
Table 8. Blinking Fault Codes and Recommended Troubleshooting.
Fault Code System Failure Recommended Troubleshooting
Code 1-1
*Low AC Line
Voltage*
Low AC Line detected. 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.
Code 1-2
*AC Quality
Problem*
Excessive noise or
device running on slow,
fast, or AC line dropout
detected.
Code 2-1
*Unexpected
Flame Signal*
Flame sensed when no
flame is expected during
STANDBY or PURGE.
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.
Code 2-2
*Flame Signal
Absent*
No-flame time present
at the end of the PIlot
Flame Establishing
Period; lost during the
Main Flame Establishing
Period or during RUN.
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.
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