Honeywell R7120M 7800 Serie Instructions D'installation page 7

SEQUENCE
STATUS
LED PANEL
RESET
BUTTON
KEYBOARD
DISPLAY
MODULE
(OPTIONAL)
ED IT:
Principal Technical Features
The R7120 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 have been changed (after
200 hours)—Fault Code 110.
d. AC line power errors occurred, see Operation.
e. Four minute INITIATE period has been exceeded.
2. STANDBY PERIOD
a. Airflow lockout feature is enabled (JR3 clipped) and
the airflow switch does not close after ten seconds
or within the specified purge card timing.
b. Flame signal is detected after 240 seconds.
RUN/TEST
SWITCH
RELAY
MODULE
CONFIGURATION
JUMPERS
PURGE
TIMER
BA CK
_
+
- EN TE R -
Fig. 3. R7120M Relay Module, exploded view.
WIRING
SUBBASE
ADAPTER
PLATE
POWE R
PILOT
FLAM E
MAIN
ALAR M
RESE T
c. Ignition/pilot valve terminal is energized.
d. Main valve terminal is energized.
e. Internal system fault occurred.
f. Purge card is removed.
g. Purge card is bad.
3. PREPURGE PERIOD
a. Airflow lockout feature is enabled (JR3 clipped) and
the airflow switch opens.
b. Ignition/pilot valve terminal is energized.
c. Main valve terminal is energized.
d. Internal system fault occurred.
e. Purge card is removed.
f. Purge card is bad.
g. Flame signal is detected for 30 seconds.
4. PILOT FLAME ESTABLISHING PERIOD (PFEP)
a. 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 terminal is
not energized.
d. Main valve terminal is energized.
7
R7120M 7800 SERIES RELAY MODULES
CAPTIVE
MOUNTING
SCREW
FLAME
AMPLIFIER
M31285
66-1193EF—01