Orion System VAV/Zone Controller - Manual (Page 9)

VAV/Zone Controller
Technical Guide
9
Expansion Board Installation & Wiring
Wiring Considerations
Expansion boards are used to supply extra relays and/or analog outputs
to control fan and heating functions for the VAV/Zone controller.
When Round VAV/Zone Dampers or Rectangular VAV/Zone Control-
ler Kits are ordered from WattMaster, the OE322 Expansion board is
shipped loose for field mounting by others.
Mounting of the OE322 Expansion Board is identical to the previously
described mounting for the VAV/Zone controller. Mount the Expansion
board near the VAV/Zone controller using the sheet metal screws pro-
vided. Be sure the mounting location is close enough so that the sup-
plied modular cable will reach from the VAV/Zone controller to the
Expansion board.
Warning: The 3 relay outputs available on the OE322
Output Expansion board are each rated for 2 Amps
@ 24 VAC. If your device load exceeds these limits,
a pilot duty relay (by others) must be used in the
circuit.
The wiring consideration information previously outlined for the VAV/
Zone controller should be followed when wiring the OE322 Expansion
Boards.
Figure 7: Expansion Board Wiring For Two Position Hot Water Heat Applications