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FIELD SELECTIONS –– DIPSWITCHES (continued)
Auto Stage; SW6 & SW7
There are applications where a single stage thermostat is
used with the two stage furnace. With this application the
furnace will initially operate in the low heat stage. Based
upon a user selected time, the furnace will automatically
stage to high heat stage mode. auto staging will take place
with a 24VAC signal on "W1" when autostaging is turned
on. "W2" will be recognized as a call for stage 2 heat even
when autostaging is active. The following dipswitches are
available to accommodate this requirement:
Selection*
SW6
SW7
A
OFF
OFF
B
ON
OFF
FAULT CLEAR
MANUAL FAULT CLEAR; SW8
Faults will automatically be cleared from the fault buffer after one
week. The fault buffer can also be manually cleared if this is de-
sired. For the first 30 seconds after a change in state of dip-
switch SW8, the furnace control will wait to determine if the
Upon power reset, the three most recent faults which are
less than one week old will be flashed in succession from
the most recent to the oldest. This will be done as a diag-
A yellow or amber L.E.D. is provided to indicate flame sta-
tus. When normal flame is sensed, the flame L.E.D. is con-
tinuously on. The flame L.E.D. will flash at a rate of one to
four flashes per second if a weak flame is detected. If an
unexpected flame is detected, the L.E.D. will flash rapidly.
On the next page is a timing diagram for normal heat se-
quence. This diagram assumes no faults are present dur-
ing the heat call.
AutoStage
Normal 2 stage operation
(Autostaging is off)
(factory setting)
AutoStage, 10 minutes on
low, then to high with
call on "W1"
C
OFF
ON
D
ON
ON
Manual Fault Clear; SW8
For the first 30 seconds after a change in state of dipswitch
becomes on/o /on/o /on/o or o /on/o /on/o /on within
SW8, the furnace control will wait to determine if the switch
30 seconds. When this action is detected within 30 sec-
onds, the fault code memory buffer shall be cleared.
switch becomes on/off/on/off/on/off or off/on/off/on/off/on
within 30 seconds. When this action is detected within 30 sec-
onds, the fault code memory buffer shall be cleared. Be sure to
return the dipswitch to the original state (on or off) or is in the de-
sired position after clearing the fault buffer using this method.
nostic aid to the field technician. After one week, a fault will
be removed from the fault buffer.
The L.E.D. is off when there is no flame detected.
For more diagnostics information, consult the wiring dia-
gram and troubleshooting chart at the end of this book.
AutoStage, 15 minutes on
low, then to high with call
on "W1"
AutoStage, 20 minutes on
low, then to high with call
on W1" *(ref only)
43
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