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Auto-Zone Control Systems Zoning Design Guide (Version 01B) User Manual

Page 25

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Auto-Zone Systems

25

Zoning Design Guide

Zone Controller

24 VAC Supply Voltage (10 VA)
(2) Conductors - Determine minimum
wire size from Figure 1-16 on page 26.

Communications Loop
(2) Conductors 18 gauge minimum
twisted pair with shield
(WattMaster communication wire,
Belden #82760 or equal)

Room Sensor
(2) Conductors 24 gauge minimum
(3) Conductors if using optional slide

Sensor Wiring
Auto-Zone temperature sensors utilize a type III ther-
mistor element that is one of the most commonly used
sensors in the building controls industry. Sensor wire
should be a minimum of 24 gauge however larger wire
such as 18 gauge is commonly used.

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

Room Sensor
(2) Conductors 24 gauge minimum
(3) Conductors if using optional slide
adjust

Controller Wiring
All controller wiring should be in accordance with all
local, state, and national codes. It is recommended that
all wire be a minimum of 18 AWG unless otherwise
specified in the charts below. Controller connections
and wire sizing is as follows:

Zone Manager

24 VAC Supply Voltage (25 VA)
(2) Conductors - Determine minimum
wire size from Figure 1-16 on page 26.

Communications Loop
(2) Conductors 18 gauge minimum
twisted pair with shield
(WattMaster communication wire,
Belden #82760 or equal)

Supply Air Temperature Sensor
(2) Conductors 24 gauge minimum

Return Air Temperature Sensor
(2) Conductors 24 gauge minimum

Outside Air Sensor
(2) Conductors 24 gauge minimum

Supply Static Pressure Sensor
(2) Conductors 24 gauge minimum

Bypass Damper
(4) Conductors 24 gauge minimum

HVAC Unit Control Wiring
(6) Conductors 24 gauge minimum
R (Common), G (Fan), Y1 (Cool 1),
Y2 (Cool 2), W1 (Heat 1), W2 (Heat 2)
For Auto-Zone Plus System With
Optional Staging Expansion Board up to
an additional (8) conductors Y3 through
Y6, W3 Through W6

System Manager

24 VAC Supply Voltage (25 VA)
(2) Conductors - Determine minimum
wire size from Figure 1-16 on page 26.

Communications Loop
(2) Conductors 18 gauge minimum
twisted pair with shield
(WattMaster communication wire,
Belden #82760 or equal)