American Dryer Corp ML-310 Phase 7 service manual Sprinkler System Description

E. SPRINKLER SYSTEM DESCRIPTION

The sprinkler system is monitored by a microprocessor based temperature controller as a designated “FAIL- SAFE.” The microprocessor circuit must have power in order to engage main power to the dryer. When cycling the dryer, if temperature at the Resistive Temperature Device (RTD) reaches 575º F (301.6º C), one (1) set of contacts in the controller will open, disabling the power (electric supply) to the dryer. Another set of contacts will close, sounding the alarm and turning on the sprinkler.

NOTE: The sprinkler as well as the alarm will remain on until the “amber” colored sprinkler reset button is pressed and the temperature in the basket (tumbler) falls below 575º F (301.6 º C).

1.Description Of Components

a.Resistive Temperature Device (RTD)

The RTD is located above the basket (tumbler). The probe is a 100 ohm (100 Ω ) platinum RTD. As the temperature increases or decreases the

resistance value corresponds to the ambient temperature (i.e., 100 Ω = 32º F [0º C]...109 Ω = 75º F [24º C]).

b. Sprinkler Valve

The sprinkler valve is a 2-way, air piloted, normally closed valve. With pilot air pressure applied, the valve opens allowing water to flow.

c. Sprinkler Solenoid Valve

The sprinkler solenoid valve is a 3-way/2-position solenoid valve that is used to supply pilot air to the sprinkler valve.

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