)
I
I
2.5 seconds. The unit operates
normally if the reset is outside
this range.
• Outages in between these
timings cause an incomplete
reset of the control. This results
in a hard lock out with the "OK"
light out. Main power must be
turned off for 4 seconds and then
back on to reset the control.
-830 Controls dated 9248 and
later were modified so that
momentary power outages
should not cause a hard lock out.
During a brief power outage, the
"OK" light goes out for 1 second,
the control resets and starts an
ignition sequence to relight.
10. CAN THE CONTROLS BE
COMBINED FOR TWINNING?
•Yes.
HONEYWELL
Honeywell control boards basically
performed the same function and had
the same components on the board
as the Hamilton-Standard. The
Honeywell control number is
S9201A1028 and carries the factory
part number of 62-22737-07.
It has two green lights. The power
light indicates the board has 24 volts
to operate. The OK light flickers as
the board checks its circuitry. Both
lights should be on during normal
operation.
A WARNING: MAKE NO ATTEMPT
TO FIELD REPAIR/MODIFY ANY
SOLID STATE CONTROL UNLESS
SPECIFICALLY AUTHORIZED BY
THE FACTORY. DOING SO MAY
RESULT IN FURNACE MALFUNC-
TION CAUSING FIRE, EXPLOSION,
PERSONAL INJURY, OR DEATH.
A WARNING: THE HONEYWELL
CONTROL, PART NUMBER
62-22737-07 (Repair Part 62-22737-
87), ARE ONLY TO BE USED
WITH THE 34" LOW PROFILE
FURNACE. USING THIS CONTROL
ON OTHER FURNACES, RESULTS
IN DANGEROUS OPERATING
CONDITIONS.
LOCK OUT STATUS
The control board reacts to
malfunctions within itself or in the
furnace system in two ways. One is a
"soft" lock out and the other is a
"hard" lock out.
In a soft lock out both green lights on
the board are on. Reset the board
either by cycling the thermostat or the
main power disconnect.
SOFT LOCK OUT CAUSES
Not detecting flame after a maximum
of five (5) ignition trials.
In a hard lock out the board is totally
unresponsive and the "OK" light is
off. The power light remains on.
Resetting can only be accomplished
by turning off main 120-volt power for
4 seconds or more.
HARD LOCK OUT CAUSES
1. The board fails a software
self-check.
2. The board senses flame before
igniter warm-up.
3. Certain brief power interruptions.
4. A hardware failure in the board.
CONTROL BOARD
CHARACTERISTICS
The S9201A1028 ... or our
62-22737-07 number, has several
operating characteristics in common
with the UTEC. It started with the
Honeywell date of 9204. The part
number and date code are located on
the white label on a board relay.
The blower delay on timing is
20 seconds after the gas valve
opens.
The blower delay off timing
settings are 90, 120, 160, and
180 seconds.
The A1028 board has a "self-
healing" feature for downflow
units to prevent no heat calls
during nuisance tripping of the
heat assisted limit control.
Due to the availability problem with
S9201A1028 ..... controls at the
beginning of 1993, a temporary
Honeywell control was used. It was
the S9201A1036 control and carries
the factory part number 62-22737-
10. It is in units with serial
numbers starting with CT. It began
with Honeywell date code 9305.
Only 15,000 pieces were used.
There are several differences
between this control and the previous
A1028 ....
It uses the (-)GED 90 Plus
furnace control microprocessor.
There is only a six (6) second
trial for ignition.
The blower off timing is the
same as the (-)GED 90 Plus
furnace off timing: 80, 120, 160,
and 200 seconds.
THERE IS NO SELF-HEALING
FEATURE WITH THIS
CONTROL. It was designed for
and installed in upflow units only
at the factory.
When the availability problem
subsided, the S9201A1028
N control
became available. This control has all
the same characteristics as the
original S9201A1028 .... It carries
the factory part number of
62-22737-08. It is used in furnaces
with serial numbers beginning with
CS. It began with Honeywell date
code 9310 and its features are
virtually the same as the
S9201A1028 ....
There is ONE major difference in
the control.
It comes with a low voltage
detector to minimize lock out
problems due to intermittent
power interruptions. The furnace
either continues operating or
restarts after a minor power
interruption.
CONTROL RESPONSES
1. POOR EQUIPMENT
GROUNDING
• Results in erratic flame sensing
and nuisance soft lock outs.
Check for poor grounding of the
burners by measuring the
resistance from the common
transformer terminal to the sheet
metal of a burner. There should
be zero/low Ohms resistance.
Check the unit grounding by
measuring the resistance from
the furnace neutral wire to the
furnace ground wire (green or
bare copper).
2. MAIN LIMIT OPENING
• Results in furnace shut down.
The gas valve closes, the
inducer fan and main blower run
until the limit resets. If the limit
does not reset, both blowers run
indefinitely.
65
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