ADC ML-175 Reversing Relay Panel, Steam Coil and Damper System, Steam Coil pH Level, Drive Motor

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Reversing Relay Panel

Lifting the control door will reveal the reversing relay box. Located on the back of the relay box is the reversing relay panel. Included on this panel is a 4-position terminal block, blower overload, blower contactor, reversing contactor, 24 VAC transformer, fuse or circuit breaker, ground lug, and possibly an arc suppressor board.

Steam Coil and Damper System

The steam coil is constantly charged, thereby eliminating repeated expansion and contraction and also provide instant heating to start the drying process. The steam damper, located on top of the steam coil, is the only temperature controlling device in this system. When the steam damper is open, ambient air is drawn through the coil providing heat to the dryer. When the steam damper is closed, ambient air is drawn directly into the tumbler, bypassing the coil, allowing a rapid cool down.

NOTE: With the dryer off or no air supply to the damper piston, the damper is in the cool down mode.

Steam Coil pH Level

NOTE: The normal pH level for copper type steam coils must be maintained between a value of 8.5 to 9.5. For steel type steam coils the pH level must be maintained between a value of 9.5 to 10.5. These limits are set to limit the acid attack of the steam coils.

IMPORTANT: Coil failure due to improper pH level will void the warranty.

Gas Burner Assembly

Gas heated dryers are equipped with a gas burner assembly consisting of four burner tubes, gas valve, ignitor, flame- probe, sail switch, and hi-limit thermostat. The inlet piping enters through the rear of the dryer on the left-hand side (viewing from the front) and runs to the front of the dryer where the gas valve is located.

Drive Motor

The T.E.F.C. drive motor is located in the right front hand corner of the dryer. It sits on an adjustable base so that the motor can be easily adjusted to the left or right.

Blower Motor and Impellor (Gas and Steam)

The impellor is shaft driven. The blower motor drives the shaft on which the impellor is mounted.

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Contents American Dryer Corporation ML-175 / ML-190Date of Purchase Model no RESELLER’S Name Serial Numbers Retain This Manual in a Safe Place for Future ReferenceTable of Contents Important Information Routine MaintenanceSafety Precautions CleaningInstallation Requirements Electrical and Gas Requirements Operational Service Check ProcedureDescription of Parts Compressed Air RequirementsSteam Coil pH Level Gas Burner AssemblyReversing Relay Panel Steam Coil and Damper SystemDrive Shaft Idler Shaft AssemblyRotational Sensor Assembly Speed Reducing ShaftTumbler Hi-Limit Main Door SwitchSail Switch Gas Models Only Burner Hi-Limit Gas Models OnlyLint Drawer Lint Drawer Switch Computer ControlsIntroduction Ignition Controls Page To Convert from Natural Gas to L.P. Gas ThermostatsTo Replace Burner Hi-Limit Thermostat Gas Models Only Front Panel and Main Door Assemblies Sail Switch Assembly Gas Models OnlyTo Replace Drive Shaft Pulleys To Install New Main Door GlassPulleys To Replace Front PanelTo Replace Drive/Idler Shaft Pillow Block Bearings Tumbler AlignmentBearings To Replace Motor PulleyTo Replace Speed Reducing Shaft Bearings Rotational Sensor Switch ReplacementTo Replace Rear Tumbler Shaft Support Wheels Belts Basket and SupportMotors To Replace Lint Screen Lint Drawer AssemblyImpellor To Replace Fan Shaft and/or Fan Shaft BearingsTroubleshooting Overload for impellor fan motor is tripping Phase 6 OPL System DiagnosticsDiagnostic L.E.D. Display Failure Codes Burner hi-limit safety thermostat is trippingD. Display Indicator Number D. Display IndicatorsFuse Main Fuse Input L.E.D. Indicator FAN Blower Output L.E.D. IndicatorAIR AIR JET Output L.E.D. Indicator Optional HT1 Heat Output L.E.D. IndicatorPhase 7 OPL System Diagnostics Example Input / Output Board L.E.D. IndicatorsTechnical Information Motor Plate High and Low VoltageTool List Using a ManometerHow To Use a Manometer Data Label450431 ADC Part No 3 06/17/08
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