WattMaster VAVBOX - Manual (Page 8)

Technical Guide
VAVBOX Controller 8
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 VAVBOX controller.
When Round VAVBOX Dampers or Rectangular VAVBOX Controller
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 VAVBOX controller. Mount the Expansion
board near the VAVBOX 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 VAVBOX 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
VAVBOX controller should be followed when wiring the OE322 Ex-
pansion Boards.
Figure 6: Expansion Board Wiring For Two Position Hot Water Heat Applications