41
DRAFT INDUCER TEMPERATURE SAFETY
SWITCH
Draft inducer runs through 30 second post purge and
switches OFF.
Circulator runs with thermostat on call for heat.
When temperature safety switch contacts connect
before end of call for heat, control goes in normal
light-off sequence.
LOSS OF COMBUSTION AIRFLOW
If combustion air
fl
ow is lost while burner is
fi
ring
(Differential air pressure switch contacts open) gas
valve is de-energized.
Valve and fl ame lights go out.
Draft inducer runs through 30 second post purge.
If call for heat remains, IBC waits 5 minutes for air
fl
ow
to be re-established.
If air
fl
ow does not re-establish control lockout problem
with combustion air
fl
ow.
Purge light blinks
.
Control automatically reset after 15 minutes.
LOSS OF FLAME SIGNAL
If established
fl
ame signal is lost while control expects
burner is operating, control immediately de-energizes
gas valve.
Valve and fl ame lights go out.
Draft inducer runs through 30 second post purge.
Control attempts to light boiler 3 times. If
fl
ame is not
proven, control lockout problem establishing
fl
ame
signal.
Valve light is blinking
.
Control automatically resets after 1 hour.
HIGH LIMIT CONTROL
If boiler water temperature reaches high
limit setpoint, high limit n.c. contacts open
immediately, closing gas valve.
Valve and fl ame lights go out.
Draft inducer continues to run for 30 second post
purge and switch OFF.
Circulator runs as long as thermostat calls for
heat.
When high limit contacts connect before end of
call for heat - control goes into normal light-off
sequence.
CASTING TEMPERATURE SAFETY SWITCH
If burner operates when boiler has no water,
aluminum boiler sections heat up rapidly.
Casting temperature safety switch contacts will
open, breaking 24 volt power to IBC.
Power indicator light goes out.
Requires manual reset to re-close contacts.
Power light goes out.
CIRCULATOR PUMP
Circulator is energized as long as thermostat calls
for heat during lockout.
Recovery from any lockout requires reset, which
can be accomplished by:
(a) Removing and re-establishing thermostat’s
call for heat or turning service switch off
and back on;
or
(b) Waiting for control to automatically reset after
15 minutes for loss of combustion air
fl
ow or one
hour for loss of
fl
ame.
If draft inducer temperature reaches temperature
safety switch set-point, safety switch contacts open
immediately, closing gas valve
(light goes out)
.
DETAILED SEQUENCE OF OPERATION
Содержание UB90-100
Страница 12: ...12 NEAR BOILER PIPING Figure 2 Single Zone Boiler Piping SAFETY RELIEF VALVE SEE PAGE 18 FOR REQUIREMENTS ...
Страница 15: ...15 NEAR BOILER PIPING Figure 5 Primary Secondary Piping With Circulators And Domestic Hot Water ...
Страница 31: ...31 Figure 20 Field Wiring Connections ELECTRICAL WIRING SAFETY RELIEF VALVE SEE PAGE 18 FOR REQUIREMENTS ...
Страница 33: ...33 Figure 22 Ladder Diagram for Figure 22 ELECTRICAL WIRING ...
Страница 52: ...52 Troubleshooting Chart 1 TROUBLESHOOTING ...
Страница 53: ...53 Troubleshooting Chart 2 TROUBLESHOOTING ...
Страница 63: ...NOTES ...
Страница 64: ...UTICA BOILERS 2201 Dwyer Avenue Utica NY 13501 web site www ecrinternational com ...