Important Wiring Considerations
General
Correct wiring of the VAV/Zone Controller is the most important
factor in the overall success of the controller installation process.
The VAV/Zone Controller wiring has been simplifi ed by the use
of modular connectors and prefabricated modular cables.
Voltage and Environment Requirements
The VAV/Zone Controller and expansion modules must be
connected to a 24 VAC power source of the proper size for the
calculated VA load requirements. All transformer sizing should
be based on the VA rating listed in
Table 1
.
Contr
ol
De
vice
V
olta
ge
V
A
Load
Temper
atur
e
Humidity
(Non-
Condensing)
OE336-23I-OR &
OE336-23D-OR
VAV/Zone Controller
24VAC
6
-30°F to
150°F
0-90%
RH
OE282-01
Zone Damper Actuator
24VAC
3
-22°F to
122°F
5-95%
RH
OE325-03
VAV/Zone Controller
Expansion Module
24VAC
5
10°F to
149°F
0-90%
RH
OE282-03
Slaved Zone Damper Kit
24VAC
3
-22°F to
122°F
5-95%
RH
Table 1: Voltage and Environment Requirements
WARNING:
When using a single transformer to power more
than one controller or expansion module, the
correct polarity must always be maintained be-
tween the boards. Failure to observe correct
polarity will result in damage to the VAV/Zone
Controller, actuator, and expansion module.
Important Wiring Considerations
Please carefully read and apply the following information when
wiring the VAV/Zone Controller Package.
See
Figure 10, page
20
for VAV/Zone Controller Package wiring and connections.
See Figure 9, page 17
for connecting and wiring multiple VAV/
Zone Controller Packages in a system.
1. Size and wire the transformer to be used for powering the
Non-Modular VAV/Zone Controller Package(s) per the
instructions. Failure to size the transformer and/or wire the
Non-Modular VAV/Zone Controller Package(s) correctly
may cause the VAV/Zone Controller Package to operate
erratically or not at all. See
Figure 8, page 16
for wiring
and transformer sizing information.
2. All wiring is to be in accordance with local and national
electrical codes and specifi cations.
3. All 24 VAC wiring must be connected so that all ground
wires remain common. Failure to follow this procedure
can result in damage to the controller and connected
devices.
4. Minimum wire size for 24 VAC wiring should be
18-gauge.
5. Minimum wire size for all sensors should be 24-gauge.
Some sensors require 2-conductor wire and some require
3-or 4-conductor wire.
6. Minimum wire size for 24 VAC thermostat wiring should
be 22 gauge.
7. Be sure that all wiring connections are properly inserted
and tightened into the terminal blocks. Do not allow
wire strands to stick out and touch adjoining terminals
which could potentially cause a short circuit.
8. Do not pry on the connectors when connecting or
disconnecting the modular cables. Be sure to push in on
the connector release clip and then pull straight up.
9. When communication wiring is to be used to intercon-
nect VAV/Zone Controllers together or to connect to other
communication devices, all wiring must be plenum-
rated, minimum 18-gauge, 2-conductor, twisted pair with
shield. WattMaster can supply communication wire that
meets this specifi cation and is color coded for the
network or local loop. Please consult your WattMaster
distributor for information. If desired, Belden #82760 or
equivalent wire may also be used.
10. Before applying power to the VAV/Zone Controller,
be sure to recheck all wiring connections and
terminations thoroughly.
14
VAV/Zone Controller Package
INSTALLATION & WIRING
