Emerson Delwarva Power, Owner'S Manual

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Delmarva Power Web-Programmable Thermostat Homeowner’s Manual 21
DDWTMS1317B—Delmarva Power IT900 Thermostat Manual
(Version 2 Thermostat with New Screen Shots)
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DDWTMS1317B
Delmarva Power IT900 Thermostat Manual (Version 2 Thermostat with New Screen Shots)
Job Opened: November 1, 2013
Requested In-Home Date: December 1, 2013
Latest Revision: November 5, 2013
Approved: December 4, 2013
Troubleshooting
No Cool
Possible Cause Corrective Action
System switch not set to COOL.
Press SYSTEM button to select COOL and press
to lower the temperature setpoint below room
temperature.
Outdoor unit disconnect or breaker tripped. Verify the outdoor unit disconnect or breaker has not
been tripped.
Cooling system requires service or thermostat requires
replacement. To diagnose this condition:
Press SYSTEM button to select COOL and press
to lower the temperature setpoint below room
temperature. Within a few seconds the thermostat
should make a soft click sound. This sound usually
indicates the thermostat is operating properly.
If the thermostat does not click after being reset,
contact your installing contractor for a replacement
thermostat. If the thermostat clicks, contact the furnace
manufacturer or HVAC contractor for a service visit to
verify the cooling is operating correctly.
Multi-stage Air Conditioner or Heat Pump:
Second, Third, or Fourth Stage Won’t Come On
Possible Cause Corrective Action
Your thermostat is designed to determine the optimum
time to activate the second stage. Simply raising the
temperature in heating or lowering it in cooling will not
always force the thermostat to bring the second stage
on quickly. There is a time delay of 0 to 30 minutes
depending on the performance of the first stage of
the system. Wait for the second, third, or fourth stage to come on.
13_DDWTMS1317B_IT900_v2_TSTAT_MANUAL-CFO-120413.indd 21 12/4/13 9:42 AM