Auto-Zone Control Systems Auto-Zone Plus Systems Installation & Operation (Version 03A) - Manual (Page 185)

Auto-Zone Plus Section 4
Start-Up and Troubleshooting 4-35
2.3.2 (continued)
Action
Condition Action
If sensor reading is too high or too low Replace the Static Pressure Sensor (Rare)
2.3.3 Zone Manager HVAC Unit Wiring Checks
Example Diagram Overview
The HVAC unit wiring can be checked at the
Zone Manager by unplugging the HVAC Unit
Connector and metering the wiring.
All meter readings are taken with one meter
lead on the "R" terminal of the plug.
Readings may vary considerably due to the
differences found in equipment from various
manufacturers. Under most conditions this
test will provide a reliable “quick check” of
the wiring.
The wiring should be considered OPEN if the
resistance exceeds 10,000 Ohms or
SHORTED if it is less than 50 Ohms.
Note The HVAC unit power must be off
for this test.
Measurements
Meter Acceptable Range
Ignore readings for any connections which are not used in the equipment
FAN - R Typically between 100 Ohms and 2500 Ohms
COOL1 - R Typically between 100 Ohms and 2500 Ohms
COOL2 - R Typically between 100 Ohms and 2500 Ohms
HEAT1 - R Typically between 100 Ohms and 2500 Ohms
HEAT2 - R Typically between 100 Ohms and 2500 Ohms
Action
Condition Action
Resistance is less than 50 Ohms Check for shorts or other wiring errors.
Resistance is greater than 10,000 Ohms Check for open circuit wiring errors.