Orion System Zoning - Manual (Page 27)

Orion Systems 27
Zoning Design Guide
System Manager
•
24 VAC Supply Voltage (6 VA)
and Communications Loop
Use Prefabricated Modular Cable
VAV/Zone Controller
•
24 VAC Supply Voltage (6 VA)
and Communications Loop
Use Prefabricated Modular Cable
•
Modular Room Sensor
Use Prefabricated Modular Cable
Sensor Wiring
Orion temperature sensors utilize a type III thermistor
element that is one of the most commonly used sensors
in the building controls industry. The sensor wire should
be a minimum of 24 gauge however larger wire such as
18 gauge is commonly used. The exception to this is
the VAV/Zone Controller utilizes a Modular Room Sen-
sor which is connected with a prefabricated modular
cable.
Conventional thermostat cable is acceptable in most
commercial and institutional installations. In some in-
stallations which have the potential for high electrical
noise, such as broadcast facilities (radio, TV, etc.), heavy
industrial (machinery, welding equipment, etc.), and
medical (x-ray, scanning, etc.), it is advisable to use
shielded cable on sensors which are located in or close
to these environments. The same cable used for the com-
munication bus can be used in these situations.
Sensor requirements are:
•
Supply Air Sensor
(2) Conductors 24 gauge minimum
•
Return Sensor
(2) Conductors 24 gauge minimum
•
Outside Air Sensor
(2) Conductors 24 gauge minimum
•
Standard Room Sensor (HVAC Unit
Controllers Only)
(2) Conductors 24 gauge minimum
(3) Conductors if using optional slide
adjust
•
Modular Room Sensor (used with VAV/
Zone Controllers Only)
Use Prefabricated Modular Cable