Principal Technical Features - Honeywell 7800 Series Installation Instructions Manual

PRINCIPAL TECHNICAL
FEATURES
The RM7838B,C provides all customary flame safeguard
functions as well as significant advancements in safety,
annunciation and system diagnostics.
Safety Shutdown (Lockout) Occurs
If:
1. INITIATE Period
a. Purge card is not installed or removed.
b. Purge card is bad.
c. Configuration jumpers were changed after 200
hours of operation.
d. AC line power errors, see Operation.
e. Four minute INITIATE period is exceeded.
2. STANDBY Period
a. Flame signal is present after 240 seconds.
b. Preignition Interlock is open after 30 seconds.
c. Ignition/pilot valve terminal is energized.
d. Main valve terminal is energized.
e. Internal system fault.
f. Purge card is not installed or removed.
g. Purge card is bad.
h. Flame detected during the last two seconds.
i. VPS Failure.
3. PURGE Period
a. Preignition Interlock opens anytime during
purge.
b. Flame signal detected during purge.
c. High Purge Rate Switch fails to close within four
minutes, fifteen seconds after the firing rate
motor is commanded to drive to high fire posi-
tion.
d. Low Fire Start Switch fails to close within four
minutes, fifteen seconds after the firing rate
motor is commanded to drive to low fire position.
e. Lockout Interlock does not close within five
seconds.
f. Ignition/pilot valve terminal is energized.
g. Main valve terminal is energized.
h. Internal system fault.
i. Purge card is not installed or removed.
j. Purge card is bad.
k. VPS Failure.
4. Purge Hold: T21
a. Preignition Interlock opens.
b. Flame is detected.
c. Lockout Interlock opens during Hold.
d. Ignition/pilot valve/main valve is energized.
e. Internal system fault.
f. Purge card is removed.
g. Purge card is bad.
h. VPS Test Failure.
5. PILOT FLAME ESTABLISHING Period (PFEP)
a. Low Fire Switch opens.
b. Lockout Interlock opens.
c. Ignition/pilot valve/intermittent pilot valve ter-
minal is not energized.
d. No flame is present at end of PFEP.
e. Internal system fault.
f. Purge card is not installed or removed.
g. Purge card is bad.
6. MAIN FLAME ESTABLISHING Period (MFEP)
RM7838B, RM7838C 7800 SERIES RELAY MODULES
a. Low Fire Switch opens.
b. Lockout Interlock opens.
c. Ignition/pilot valve terminal is not energized.
d. Main valve terminal is not energized.
e. No flame is present at end of MFEP.
f. Internal system fault.
g. Purge card is not installed or removed.
h. Purge card is bad.
7. RUN Period
a. Flame is present.
b. Lockout Interlock opens.
c. Main valve terminal is de-energized.
d. Internal system fault.
e. Purge card is not installed or removed.
f. Purge card is bad.
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