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On Board Links
On Board links must be clipped (when applicable) before
unit is placed into operation with a non-communicating
thermostat.
On Board Link W914 DS to R
On Board link W914, is a clippable connection between
terminals DS and R on the integrated control. W914 must
be cut when installed with a thermostat which features
humidity control. Refer to Table 24 for operation sequence
in applications for this unit, a thermostat which features
humidity control and a single speed outdoor unit. Table 25
gives the operation sequence in applications with a two
speed outdoor unit.
On Board Link W951 R to O
On Board link W951 is a clippable connection between
terminals R and O on the integrated control. W951 must
be cut when the furnace is installed in applications which
include a heat pump unit and thermostat which features
dual fuel use. If the link is left intact, terminal "O" will remain
energized eliminating the HEAT MODE in the heat pump.
On Board Link W915 Y1 to Y2
On Board link W915 si a clippable connection between
terminals Y1 and Y2 on the integrated control. W915 must
be cut if two stage cooling will be used. If the link is not cut
the outdoor unit will operate in second stage cooling only.
Diagnostic LED
The seven segment diagnostic LED displays operating
status, target airflow, error codes and other information.
The table on Page 58 lists diagnostic LED codes.
Diagnostic Push Button
The diagnostic push button is located adjacent to the seven
segment diagnostic LED. This button is used to enable the
Error Code Recall mode and the Field Test mode. Press
the button and hold it to cycle through a menu of options.
Every five seconds a new menu item will be displayed.
When the button is released, the displayed item will be
selected. Once all items in the menu have been displayed,
the menu resumes from the beginning until the button is
released.
Error Code Recall Mode
Select "E: from the menu to access the most recent 10
error codes. Select "c" from the Error Code Recall menu
to clear all error codes. Button must be pressed a second
time while "c" is flashing to confirm command to delete
codes. Press the button until a solid "-" is displayed to exit
the Error Code Recall mode.
507029-05
Field Test Mode
Use the diagnostic push button to scroll through the menu
as described above. Release the button when the LED
flashes "-" to select the Field Test mode.
While in the Field Test mode, the technician can:
•
Initiate furnace ignition and move to and hold low-fire
rate by applying a R to W1 jumper.
•
Initiate furnace ignition sequence and move to an hold
high-fire rate by applying a jumper from R to W1 and
W2.
•
Initiate furnace ignition sequence and move to and
hold mid-fire rate by applying a jumper to R and W2.
•
Apply then remove the jumper from R to W1 and W2
to change the firing rate from low fire to mid fire and
high fire.
•
A vent calibration sequence can be initiated even if a
thermostat signal is not present. Press and hold the
push button until a solid "C" is displayed. Release
the button and calibration will begin. The furnace will
perform the high-fire and low-fire pressure switch
calibrations and display "CAL". After calibration , the
LED will return to the flashing "-" display.
During Field Test mode operation, all safety switches
are still in the circuit (they are not by-passed) and indoor
blower performance and timings will match DIP switch
selections. Current furnace firing rate, indoor blower CFM
and flame signal will be displayed. To exit the Field Test
mode, press and hold the button. The menu will resume
from the beginning. Also, cycle the main power to exit the
Field Test mode. The integrated control will automatically
exit the Field Test mode after 45 minutes of operation
Issue 2241
Page 45 of 73
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