• When the limit resets, the
inducer fan runs for 30 seconds
and stops. The main blower runs
for its off delay. After the main
blower stops, the inducer starts
and goes through a normal
ignition sequence.
3. HEAT ASSISTED LIMIT
CONTROL (HALC) OPENING
• The "self healing" feature shuts
down the gas valve, and keeps
the inducer running. If the next
trial for ignition fails, it starts the
main blower immediately. The
main blower runs for its off
delay. This should reset the
HALC. At the same time it goes
through up to four more normal
ignition trials and relights.
If it doesn't relight, the unit
locks out.
4. PRESSURE SWITCH
OPENING
• If the pressure switch opens
the gas valve immediately
closes. The induced draft blower
continues to run. If the pressure
switch contacts do not close, the
induced draft blower runs
indefinitely.
5. LOW/NO GAS PRESSURE
• With insufficient gas pressure
to generate a proper flame, the
control loses flame sensing and
goes into soft lock out.
6. IMPROPER POLARITY
• If the control or furnace is
wired improperly, the control
lights the burners, but cannot
sense the flame current. It goes
into soft lock out after 5 trials for
ignition.
7. VOLTAGE SPIKES
• Voltage spikes should have
no effect.
8. VARIATIONS IN 60 HERTZ
FREQUENCY
• The timing of the ignition
sequence changes in proportion
to the frequency variation.
9. MOMENTARY POWER
OUTAGES
• There are three outcomes from
a loss of power:
A. If the power interruption is
very short, the control does
not know power was lost and
continues what it was doing.
If the gas valve drops out, the
control senses loss of flame
and recycles.
B. If the power interruption is
long enough, it simulates an
open limit and the control
responds as such.
C. Power outages in between
cause a low voltage condition
at the microprocessor and the
unit fails a RAM check. This
results in a hard lock out.
10. CAN THE HONEYWELL
CONTROLS BE COMBINED
FOR TWINNING?
• A twinning kit for the Honeywell
S9201A1028 control is the
RXGP-F02 kit consisting of extra
blower door switches and wiring.
FIGURE60
BLOWER OFF SETTING -
HONEYWELL INTEGRATED CIRCUIT
-1028 SERIES
SETTING BLOWER OFF
CONTROLS ON BOARD
The board automatically starts the
main blower 20 seconds after the gas
valve opens. It stops the main blower
a set time after the heat call ends.
The off timing depends on the
position of three small switches on
the UTEC board or two screws on the
Honeywell board.
The board comes set to run the
blower for 120 seconds after the
burner stops. By changing the
position of the screws or switches,
the blower off timing varies from 90
to 180 seconds.
The blower off timing on the
Honeywell control depends on the
HONEVW£LL
DOWNFLOW MOOELS
MODEL STil101A
90 SEC. 120 SEC. 150 SEC. 180 SEC.
FIGURE 61
BLOWER OFF SETTING -
UTEC INTEGRATED CIRCUIT
-823/830/831 SERIES
r
r
....
r
UTEC
DOWNFLOW MODELS
OFF TIME SWITCH1
SWITCH2 SWITCH3
90 SEC. ON ON ON
120 SEC. OFF
OFF OFF
160 SEC. OFF
ON OFF
180 SEC. ON OFF OFF
66
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