Suburban Furnace No Delay
I don't know if this is anything to be concerned about. My Suburban furnace has no delay starting or stopping. It blows hot air and can be adjusted with the thermostat but it always is immediate fan...
Forum Discussion
This is the operation for your model. Doug
SEQUENCE OF NORMAL OPERATION
(I)When the thermostat calls for heat, the blower
motor is energized immediately.
(2) As the blower motor reaches approximately
75 percent of the normal r .p .m. (within 3 to 5
seconds) the microswitch, in response to the air
flow, will engage allowing current flow to the
solenoid valve and the spark ignition system .
(3) The current to the valve opens it and allows.
gas to the main burner . The spark then ignites
the main burner .
(4) After main burner ignition, the flame detector
will sense the presence of flame (usually within
7 seconds) and deenergize the lockout feature .
If the main burner does not ignite or the flame
detector does not deenergize the lockout feature
within 7 seconds, the unit will go into lockout.
At this time, it will be necessary to set the
thermostat on OFF and repeat steps I through 6
of the lighting instructions .
(5) After 3 attempts with no ignition or main
burner continues to go off within 7 seconds, go
to shutdown and determine cause . (See service
hints)
(6) If within a period of approximately 2 minutes
after the main burner is lit, the thermostat is
turned back, both the blower motor and solenoid
valve are deenergized . However, if the furnace
continues to run longer than 2 minutes, which it
normally should, a slight snap can be heard from
within the casing . The snap is caused by the
fan switch as it changes its position . After this
occurs, if the thermostat is satisfied or turned
back, the solenoid valve will close, the flame on
the main burner will go out, but the blower will
continue to run for a short period of time and will
then shut off. The purpose of this is to remove
most of the remaining gases from the heat exchanger. Be assured that this period of blower
override is a part of the unit's normal operation
SEQUENCE OF NORMAL OPERATION
(I)When the thermostat calls for heat, the blower
motor is energized immediately.
(2) As the blower motor reaches approximately
75 percent of the normal r .p .m. (within 3 to 5
seconds) the microswitch, in response to the air
flow, will engage allowing current flow to the
solenoid valve and the spark ignition system .
(3) The current to the valve opens it and allows.
gas to the main burner . The spark then ignites
the main burner .
(4) After main burner ignition, the flame detector
will sense the presence of flame (usually within
7 seconds) and deenergize the lockout feature .
If the main burner does not ignite or the flame
detector does not deenergize the lockout feature
within 7 seconds, the unit will go into lockout.
At this time, it will be necessary to set the
thermostat on OFF and repeat steps I through 6
of the lighting instructions .
(5) After 3 attempts with no ignition or main
burner continues to go off within 7 seconds, go
to shutdown and determine cause . (See service
hints)
(6) If within a period of approximately 2 minutes
after the main burner is lit, the thermostat is
turned back, both the blower motor and solenoid
valve are deenergized . However, if the furnace
continues to run longer than 2 minutes, which it
normally should, a slight snap can be heard from
within the casing . The snap is caused by the
fan switch as it changes its position . After this
occurs, if the thermostat is satisfied or turned
back, the solenoid valve will close, the flame on
the main burner will go out, but the blower will
continue to run for a short period of time and will
then shut off. The purpose of this is to remove
most of the remaining gases from the heat exchanger. Be assured that this period of blower
override is a part of the unit's normal operation
