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S9240F1004 MODULATING HOT SURFACE IGNITION INTEGRATED FURNACE CONTROL
Field Test Mode
In Field Test Mode you can:
• Initiate furnace light-off sequence and move to and hold
low firing rate by applying a W1 signal.
• Initiate furnace light-off sequence and move to and hold
high firing rate by applying a W1+W2 signal.
• Initiate furnace light-off sequence and move to and hold
mid firing rate by applying a W2 signal.
• Change the furnace firing rate between low, mid, and high
by applying and removing W1 and W2 signals.
NOTE:
Removal of both W1 and W2 at the same time will
cause furnace to shut down.
• Initiate the pressure switch calibration sequence
regardless if thermostat signals are present. The furnace
performs the low and high pressure switch calibrations and
displays "C A L" on the LED. After calibration, the LED
returns to the flashing "–" display.
Idle mode
Pressure switch proving states, purge states, HSI warm-up, TFI, etc. (All transitional
ignition states)
Heating stage:
Shows what stage of furnace heating is currently operating. Shown only while heating is
active and unit is set up to work as staged equipment (not modulating)
The display example in this table shows the LED display when the 1st stage heat is active.
Heating input (%):
Shows what furnace input percent (40 to 100%) is currently operating. Shown only while
heating is active and while unit is set up to work as modulating equipment (not staged).
The display example in this table shows the LED display when the furnace input is at 40%
heat
CFM:
Shows the current CFM demand of the main blower in actual CFM.
The display example in this table shows the LED display when the CFM = 1600.
Flame Current:
Shows the current flame signal in 0.1
The display example in this table shows the flame signal at 10.3
Diagnostic recall:
Shows the stored diagnostic codes. Diagnostic recall mode times out in 60 seconds.
The display example in this table shows the LED display for error 250.
NOTE: A button press interrupts the current display pattern.
NOTE: E 0 0 0 flashes if there are no codes.
Fault Memory is clear.
Vent Calibration
Field Test Mode - Idle
Field Test Mode - Heating
The display example in this table shows furnace input at 40% Heat.
NOTE: The flame current displayed, is the value read when the push button was pressed
at the beginning of the LED display sequence.
a
The current display mode is immediately interrupted if the operating mode changes
69-2088—01
Table 10. Gas Heat LED Display.
Description
μ
A.
26
No safety control or other safety related parameters are
bypassed during Field Test Mode.
Normal routines (like changing CAI speed if the high pressure
switch opens, etc.) are retained as active while in Field Test
Mode.
Indoor blower performance and timings will match dip switch
selections.
Error code recall and clearing is not available in Field Test
Mode.
Field Test Mode is exited by: pressing the push button, cycling
main power, or after 45 minutes in Field Test Mode.
Gas Heat Display – System Status
μ
A.
Display Example
(LED display in bold)
Only the decimal symbol blinks.
There is no display in idle mode.
H
H 1
Pause; Display CFM
Pause; Repeat
H 4 0
Pause; Display CFM
Repeat
A 1 6 0 0
Pause
F 1 0 . 3
Pause
E 2 5 0
Pause
E
Pause
Continues for up to 10 codes.
Pause for 3 seconds and start over.
0 0 0 0
Return to normal operation
C A L
Pause
"–" flashes
H 4 0
Pause; Display CFM
Pause; Display Flame Current
Repeat
a
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