HVAC Procedure and Performance Guide
TASK: Analyze electronic circuit containing power source, control card, sensor and control device
Training for this procedure can be found in these courses:
STANDARD OF PERFORMANCE
Defective components in solid-state electronic circuit must be identified and required repairs determined. Applicable safety procedures must be followed.
PROCEDURE GUIDE
- Review job order, manufacturer’s specifications, wiring diagrams and troubleshooting procedures.
- Determine the following:
a. Function(s) performed by circuit
b. Power supply voltage
c. Sensor type
1) Switch (bimetal, filled system)
2) AC/DC rectification (flame rectifier)
3) Variable resistance (thermistor, CAD cell)
4) Millivolt generation (thermocouple, thermopile)
d. Control device type
1) Switch
2) Relay
3) Control valve
4) Safety device
e. Board-mounted relay information
1) Coil voltage
2) Contact rating
3) Time-delay capabilities
f. Devices bearing Underwriter’s Laboratory or other testing agency labels