Orion System Zoning - Manual (Page 24)

24 Orion Systems
Zoning Design Guide
System Installation
Mounting Of Controllers
All Orion Round Dampers or Rectangular Damper Kits
have the required controllers, actuators etc. factory
mounted in an indoor rated control enclosure. If you
wish to use another manufacturers dampers for zoning
control you must purchase Zone or Bypass Packages
from WattMaster. These are furnished without a mount-
ing enclosure. Most local codes require these compo-
nents be mounted in an enclosure. If yours does not
require this it is still strongly recommended that you do
mount them in an enclosure. Components that are not
in an enclosure are in danger of being damaged, and
are susceptible to dirt and moisture contamination. You
may furnish your own enclosure or one is available from
WattMaster. The part number for the WattMaster en-
closure is EE000075-01. This is an indoor rated enclo-
sure. If the zone mounting location is susceptible to
water damage, watertight enclosures can be purchased
at any local electrical supply. Mounting location for the
controllers should not violate any local, state or national
codes.
System Wiring
Wiring requirements for Orion systems can be broken
down into four main categories:
1.) Power Wiring
2.) Communications Wiring
3.) Controller Wiring
4.) Sensor Wiring
The Orion System utilizes two different methods of
connecting the above categories of wiring between the
components on the Orion system. Some devices utilize
standard terminal to terminal wiring while other devices
utilize modular wiring connections with prefabricated
cables being used to connect the devices to each other.
VAV/Zone Controllers, the Modular System Manager
and the Modular Polling Device power and communi-
cations wiring is achieved by using a Power/Comm dis-
tribution board and prefabricated modular cables. These
cables distribute the power and communications sig-
nals to each modular device connected to the Power/
Comm board(s). These devices also use modular con-
nections for all sensor wiring.
All HVAC Unit Controllers such as the VAV/CAV Con-
troller, MUA Controller and the HCCO Controller use
terminal to terminal wiring for power, communications,
sensor and controller wiring. The GPC Controller, GPC-
17 Controller, Lighting Panel Controller and the Opti-
mal Start Scheduler also utilize this wiring method.
Standard Terminal to Terminal Power Wiring
All Orion Unit Controllers and Add-On Devices are
powered by 24 VAC. It is possible to power these by
using one or more common transformers or individual
transformers for each device. Possible problems you
may encounter using common transformers to power
multiple devices are:
•
Polarity Must Be Maintained Between
Devices Connected To A Common
Transformer.
If polarity is not maintained, shorting of the
transformer will occur resulting in damage to
the system electronics.
•
It is important when powering multiple devices
from one transformer that total VA load and
wiring voltage drops be taken into account. For
proper sizing of the transformer and wire see
Figure 1-16.
It is therefore recommended that in most installations
individual transformers be installed for each device.
This will greatly reduce the possibility of errors and
possible damage to the system.
Power wiring should always be done in accordance with
any local, state, or national codes.