29
operation as directed by the EcoNet
TM
Control Center.
NOTE: Should the outdoor ambient temperature
thermistor fail, the UODC will initiate a defrost
every 34 minutes of operation when the coil
temperature is below 35°F.
Table 11: Coil Temperature Switch Settings
Switch 1 Switch 2
Coil Temperature
at Defrost Termination
Off Off 60ºF [15.6ºC]
On Off 50ºF [10ºC]
Off On 40ºF [4.4ºC]
On On 70 º F [21.1º C]
6.8 Sequence of Operation for
Conventional 24VAC Thermostat
Controls
When the (-)A18AZ/(-)P18AZ heat pump system is
controlled by a conventional 24VAC 2-stage thermostat
rather than the EcoNet
TM
Control Center, the system
will operate as follows:
• The system will operate as a single-stage system
instead of a variable speed system.
• When a call for cooling or heating is received
from the thermostat, the compressor will start and
operate at the nominal capacity level and the (-)
HMV air-handler will deliver the nominal air-flow
level. For dual fuel applications, an (-)802V,
(-)96V, (-)97V, or (-)98V variable speed gas furnace
will deliver 100% of the cooling air-flow level
selected by using the Bluetooth Contractor's App
(Dipswitches are not available).
• When the call for operation ends, the system will
shut down and remain in stand-by mode until
another call for operation occurs.
• Demand defrost and low-ambient cooling function
normally.
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