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VAV/Zone Controller Package
INSTALLATION & WIRING
VAV/Zone Controller Expansion
Module Outputs
As previously stated, when you are using a fan terminal unit or
have more than 1 stage of electric heat, have SCR electric heat, or
have modulating HW heat, the OE325-03 VAV/Zone Controller
Expansion Module is required.
Binary Input - Proof of Flow
This input is for an airfl ow Proving Switch. It is only an option
with Stand-Alone damper applications using electric reheat.
Relay #1 - Fan Enable
This relay is used for energizing the Fan on Series or Parallel
Fan Terminal units.
Relay #2 - Heating Stage 1
If you have at least 1 stage of Heat, this relay is used to energize
the 1
st
stage of terminal unit Heat. This Heating Stage can either
be used with Electric Heat or On/Off Hot Water Valve control.
Relay #3 - Heating Stage 2
If you have 2 stages of Electric Heat, this relay controls the 2
nd
stage of Electric Heat.
Relay #4 - Heating Stage 3
If you have 3 stages of Electric Heat, this relay controls the 3
rd
stage of Electric Heat.
Analog Output
If you are using SCR Electric Heat or a modulating Hot Water
Valve or modulating Steam Valve for Heating, this output can
supply a 0-10 VDC signal for proportional control of the Valve
or SCR Electric Heater.
VAV/Zone Controller Expansion Module Inputs and Outputs
Other Connections
E-BUS Connectors
The EBC E-BUS modular connectors are used to connect the
optional OE325-03 VAV/Zone Controller Expansion Module to
the VAV/Zone Controller. The expansion module is only required
when staged electric heat (more than 1 stage), SCR electric heat,
modulating HW heat, and/or fan terminal control is required.
The E-BUS connector can also be used to connect an E-BUS
Digital Room Temperature Sensor to the VAV/Zone Controller
if desired.
Actuator Modular Connector
This modular connector is used to connect a modular cable from
the VAV/Zone Controller to a damper actuator.
Communications Terminal Block
This three position terminal block is used for connecting the
communications wiring between each VAV/Zone Controller and/
or to the MiniLink, HVAC Unit Controller, or other installed
controller on the local communications loop. Communications
wiring should be 18 gauge minimum 2 conductor twisted pair
with shield Belden #82760 or its equivalent.
24 VAC Power Terminal Block
This two position terminal block is used to wire the 24 Volt
power to the VAV/Zone Controller Packages. If desired, a single
transformer can be used to power multiple VAV/Zone Control-
ler Packages together, or a separate transformer can be used for
each controller.
WARNING:
If multiple controllers are to be wired to the
same transformer, polarity must be observed or
damage to the controller will result.
