16Restrictions:Restrictions can occur any place in the airflow system,but the most common are:1. Installing the dryer in a small inclosed area, such asa closet without a louvered door that reduces theintake air.2. Fan problems caused by either a slow running motor,a broken or deformed fan blade or a deformed fanhousing.3. A lint restriction in the lint screen area. Operatormay not be cleaning the lint screen before using.4. A restriction in the exhaust system in the housecaused by the design of the vent, such as, the diameterof the vent pipe being too small, too long, too manyright angles, or a collapsed or lint restricted vent pipe.Note: Problems caused by the vent pipe in the houseare not covered under the product warranty.Air leaks:Two types of air leaks may occur:1. Air being drawn in around the door opening,between the drum and the front panel, or aroundthe foam seal between the front duct and theblower housing, replaces some of the air beingdrawn through the drum and lowers the efficiencyof the dryer.Note: An air leak that occurs around the dooropening or between the drum and thefront panel usually will cause lint to buildup on the inner panel of the door.2. Air being pushed out around the blower housing orvent pipe inside the dryer, allows some of themoisture that has been removed from the clothes tobe recirculated.Short unrestricted vents:The venting system in the dryer is designed to operateunder some back pressure. This back pressure isneeded to slow the airflow and allow the air to be heatedbefore it passes through the clothes.Note: With short direct vent runs, such as youhave when the dryer is installed against anoutside wall, use a 2 1/2” vent cap ratherthan a 4” vent cap.Electrical Operation (Electric Dryer Models)Note: Always refer to the wiring diagram or sche-matic with the product.When the dryer is connected to electrical power, line 1is connected to one side of the thermal limiter and theCOM terminal of the heater relay RL 2 that is mountedon the electronic control board. Power is applied to thecontrol board through thermal limiter to pin 1 of theeight pin plug. The electronic control board controlsthe operating temperature of the dryer and length ofthe cycle by either sensing the amount of moisture inthe clothes or cycles for a fixed amount of time whentime dry is used.Note: For information on programming theelectronic control and the cycles, refer tosection A.Electronic Control Board Circuits:Line 1 is applied to the control board at pin 1 of theeight pin plug and neutral on pin 2 of the eight pin plug.The control board receives inputs from the selectorswitch, temp switch and push buttons which programthe control, the contact sensors that sense the amountof moisture in the clothes, and the control thermistor,which senses the temperature in the dryer. The controlboard uses these inputs to control the drive motor circuitby opening and closing the contacts of relay RL 1 andthe heater circuit by opening and closing the contacts ofrelay RL 2.