850 Communicating Wi-Fi Comfort Control
18-HD73D1-9E-EN 19
8. Diagnostic Tools
8.1 Test Modes
Access Test Modes by navigating to Service Menu>Test Modes. All test modes will terminate automatically after 60 minutes
or can be terminated manually at any time.
8.1.1 Non-Variable Speed
MODE SETTINGS DESCRIPTION
Test Blower 50%, 100% Energize indoor blower at the selected speed
Test Cool
Stage 1
Stage 2
Energize the selected stage of cooling operation. The indoor blower will also operate at
the speed required for the selected stage
Test Compressor Heat
Stage 1
Stage 2
Energize the selected stage of compressor heating operation. The indoor blower will also
operate at the speed required for the selected stage
Test Indoor Heat
Stage 1
Stage 2
Stage 3
Energize the selected stage of indoor heating operation. The blower operation will be
dependent on the indoor heat type:
Electric - blower energized during test mode but the blower speed is controlled by the
indoor unit
Fossil - blower is controlled independently by the indoor unit during test mode
Hydronic - blower is energized during test mode
Test Compressor and Indoor
Heat
Stage 1 Indoor Heat
Stage 2 Indoor Heat
Stage 3 Indoor Heat
Energize all stages of compressor heat and selected stage of indoor electric heat/hydronic
heat. The blower is energized and runs at the higher of the compressor heat air flow
versus indoor heat air flow
More
Test Humidifier,
Test Aux Contact
Closes the normally open Humidifier/AUX contacts. The blower is not energized during
this test mode
8.1.2 Variable Speed
MODE SETTINGS DESCRIPTION
Charging Mode - Cooling Test
Energizes outdoor unit at the correct compressor speed and associated
indoor blower speed to set/verify sytem charge. Use sub-cooling
tables in the outdoor unit Service Facts to determine correct charge
levels. Outdoor temperature must be within 55F to 120F and indoor
temperature must be between 70F to 80F. This is the only approved
method for charging/verifying system charge on variable speed systems.
Check Charge Mode - Heating Test
Energizes outdoor unit at the correct compressor speed and associated
indoor blower speed to compare actual performance to typical
performance. Use the pressure curves in the outdoor unit Service Facts
for comparison. This method is not an approved method for verifiying the
charge on variable speed systems.
Checkout Mode - Cooling 0-100%
This test mode allows the user to adjust the cooling compressor speed
in selected increments from minimum to maximum. The single arrows
represent a 1% change and double arrows a 5% change. This test mode
allows the user to troubleshoot noise/harmonics which may occur at
various compressor speeds.
Checkout Mode - Heating 1 to100%
This test mode allows the user to adjust the heating compressor speed
in selected increments from minimum to maximum. The single arrows
represent a 1% change and double arrows a 5% change. The user can
also initiate a forced defrost cycle from the test mode screen. This test
mode allows the user to troubleshoot noise/harmonics which may occur
at various compressor speeds.
Pump Down Mode - Cooling Test
This test mode will pulse the latching switchover valve to cooling position
and run at full compressor speed. The outdoor EEV will remain open
and the indoor EEV (if installed) will continue to control superheat.
Pump Down Mode - Heating Test
This test mode will pulse the latching switchover valve to heating
position and run at full compressor speed. The outdoor EEV will control
superheat and the indoor EEV (if installed) will remain open.
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