Installation Manual

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NOTE: In a dual fuel installation with a non-communicating

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-

dedthermostatwirecanbeusedtoreduceoreliminatepo-

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.

Non-communicating equipment

The Observer

Control, when paired with the NAXA00101DB

daughter board, will operate non-communicating equipment.

When the system utilizes the NAXA00101DB daughter

board, the Observer Control operates as a standard univer-

sal thermostat. See Appendix Wiring Diagrams

Mounting

First become familiar with all plastic assembly pieces shown

in Figure 2. The wall control will snap together with the

back-plate. A back-plate is supplied Figure 2. Attach

back-plate using only a small hole in the wall allowing a four

wire connection to pass through. Mount the assembly to the

back-plate.

NOTE: Once Observer Control is secured to wall with the

back-plate assembly (snapped together), care must be taken

not to bend or break the interlocking tabs when removing.