Honeywell 7800 Series Manual page 15

Fault Code
Fault 45 Low Fire Interlock switch failure
*Low Fire Sw. Off* to close or stay closed.
Fault 46 This fault indicates:
*Flame Amp Type* a.
b.
c.
Fault 47 The configuration jumpers differ
*Jumpers Changed* from the sample taken at startup.
Fault 48 V2S valve terminal, used as a
*Delayed MV On* delayed main valve, was on when
it should be off.
Fault 49 The manual open switch was on
*Man-Open Sw. On.* when it should be off.
Fault 50 The sequence logic detected a
*Jumpers Wrong* combination of jumpers that is
illegal for the sequence eg, if it is
correct to clip Jumper JR1 or
Jumper JR2, but not both, this
fault would be used when both
are clipped (RM7888 only).
Table 3. Hold and Fault Message Summary (continued).
System Failure
The Flame Failure Response
Time (FFRT) or TYPE input
from the amplifier changed
while the device was
powered; or
A standard amplifier was
used in a pilot valve
application; or
A three-second FFRT
Amplifier was used with the
relight option on the
RM7890 Relay Module.
Recommended Troubleshooting
1. Check wiring; correct any errors.
2. Reset and sequence the relay module.
3. Use either the manual motor position to drive the motor to
the Low Fire position, or use the Run/Test Switch option, if
available. Sequence to Run, drive to Low Fire and place in
the Test position. Adjust the Low Fire Switch while in this
state to make sure it is closing properly.
4. While in Run, drive to Low Fire state, measure the voltage
between terminal 18 and G (ground). Line voltage should
be present. If not, the switch adjustment is incorrect
and/or the switch is defective and needs replacement.
5. If steps 1 through 4 are correct and the fault still persists,
replace the relay module.
1. Remove power to the device.
2. Reseat the flame amplifier and reset and sequence the relay
module.
3. For EC/RM7890 only; make sure that Jumper JR2 is
completely clipped if a three-second FFRT amplifier is
being used. If Jumper JR2 is intact (relight option is
selected), use 0.8 second FFRT amplifier.
4. For RM7838B only; make sure that a Shutter Check Flame
Amplifier is being used with the Pilot Valve Hold option
selected.
1. Inspect the jumper connections. Make sure that clipped
jumpers are completely removed.
2. Reset and sequence the relay module.
3. If fault persists, replace the relay module.
WARNING
Explosion Hazard.
Can cause explosion, serious injury or death.
1. Remove system power, turn off fuel supply.
2. Check wiring; correct any errors.
3. Inspect the V2S Fuel Valve and its connections.
Make sure the switch is working correctly and is not
jumpered or welded.
4. Reset and sequence the relay module.
5. If fault persists, replace the relay module.
WARNING
Explosion Hazard.
Can cause explosion, serious injury or death.
1. Remove system power, turn off fuel supply.
2. Check wiring; correct any errors.
3. Inspect the Manual-Open Switch and its
connections. Make sure the switch is working
correctly and is not jumpered or welded.
4. Reset and sequence the relay module.
5. If fault persists, replace the relay module.
1. Inspect the jumpers and refer to the installation instructions
for compatible jumper configurations.
2. Make sure that clipped jumpers are completely removed.
3. Reset and sequence the relay module.
4. If fault persists, replace the relay module.
15
7800 SERIES RELAY MODULES
(continued)
65-0229—1