Floaire DIRECT FIRED MODULE Manual do Utilizador descarregar pdf (Página 20)

Components

The following image and list outlines the typical direct fired heater components and their functions.

1. Gas Inlet – Main gas supply connection

2. Motor Starter – Contactor with overload protection to start and protect motor.

3. Cooling Interlock Relay (Optional) – Energizes power to cooling circuit on call for cooling.

4. Inlet Gas Pressure Gauge – Inlet gas pressure should be read from here.

5. Combination Gas Valve - A combination of redundant solenoid valves, pilot valve and gas

regulator built into one unit.

6. Pilot Tubing – Pilot tube connection to combination gas valve.

7. Manual Reset High Temperature Limit – Safety device that prevents the heater from

overheating.

8. Modulating Amplifier - Regulates temperature by a modulating gas valve

9. Power Transformer – Installed when motor voltage > 120V. Used to provide 120V service to

controls.

10. Circuit Breaker – Protects electrical components from high current spikes.

11. Terminal Strip – Central location to terminate control wiring. Should be used for troubleshooting.

12. Control Transformer – 120V primary; 24V secondary control transformer.

13. Low Pressure Airflow Probe – Measures profile pressure downstream of burner.

14. High Pressure Airflow Probe – Measures profile pressure upstream of burner.

15. Modulating Gas Valve – Modulates gas flow to burner to provide proper air temperature.

16. Manifold Gas Pressure Gauge – Manifold gas pressure should be read from here.

17. Flame Safety Control – Initiates and monitors flame.

18. Airflow Switch – A safety device insuring proper air flow during burner operation.

19. Ignition Transformer – Produces high voltage spark to ignite flame.

20. Intake Air Thermostat – De-energize heating circuit when intake air exceeds set-point.

21. Damper Actuator – Motor containing end switch that opens intake damper.

22. Manual Gas Shut-Off Valve Allows gas flow to burner to be shut off to leak test gas train

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Floaire DIRECT FIRED MODULE Manual do Utilizador Página 20