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616 01 1017 02
11. Perform installation of all other system equipment (i.e.
humidifier, UV lights, etc.).
12. Turn on power to equipment.
NOTE: In a dual fuel installation with a noncommunicating
heat pump, an OAT sensor must be installed, or the heat
pump will not run.
Shielded Wire
If the thermostat wiring will be located near or in parallel with
high voltage wiring, cable TV or Ethernet wiring, then shiel
ded thermostat wire can be used to reduce or eliminate po
tential interference. The shield wire should be connected to
the C terminal, or ground, at the indoor unit. The shield wire
should NOT be connected to any terminal at the wall control.
Connecting the shield to ground at both ends can cause cur
rent loops in the shield, reducing shield effectiveness.
Noncommunicating equipment
The Observer Control, when paired with the NAXA00101DB
daughter board, will operate noncommunicating equipment.
When the system utilizes the NAXA00101DB daughter
board, the Observer Control operates as a standard univer
sal thermostat. See Appendix Wiring Diagrams
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