WattMaster Auto-Zone Plus, Design, Installation And Operation

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Section 2
Auto-Zone Plus
2-22 Design Guide
Warning:
Polarity is very important when connecting power to the controllers!
The grounded side of the control transformer must be connected to
the terminal labeled GND on the CV Controller. If a single
transformer is used to power more than one CV Controller you must
connect GND-to-GND and 24VAC-to-24VAC on each CV controller.
Failure to observe polarity will result in damage to one or more
components in your system.
Warning:
Use extreme care not to damage any of the electronic components
while mounting the backplate. Mark the holes then remove the CV
Controller from the backplate before drilling.
Do not allow metal shavings to fall onto the circuit boards.
The Constant Volume Controller requires the following electrical connections :
18 Gauge minimum unless otherwise noted.
-24VAC Supply Voltage........................................................................... 2 Conductors
-Communications Loop ...................................... 2 Conductor twisted pair with shield
(Belden #82760 or equivalent)
-Supply Air Temperature Sensor .......................................(24 ga. Min.) 2 Conductors
-Room Air Temperature Sensor.......... (24 ga. Min.) 2 Conductors for standard sensor
3 Conductors for sensors with setpoint adjustment
-Outside Air Temperature Sensor.......................................(24 ga. Min.) 2 Conductors
-HVAC Unit Control Wiring .....................................................................R - Common
G - Fan
Heat/Cool Stage 1
Heat/Cool Stage 2
Heat/Cool Stage 3
Heat/Cool Stage 4
Tip
After making all electrical connections it is advised to unplug all terminal blocks
on the CV Controller until you are ready to begin the checkout procedure. This
may help to prevent damage if wiring errors occur elsewhere in the system
during installation or start-up.
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