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Dave Harnish
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Dave's Repair Service
1911 Heath Hill Rd
New Albany, PA 18833
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Dave's Dictionary of Appliance Terms
The 'H' page

NEW! Download this entire 28 page dictionary in one ebook!

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Heat exchanger – We have in mind here the suction/capillary line assembly that carries refrigerant to/from a refrigeration system’s evaporator coil. Running these two tubes in close contact with each other (usually soldered together) increases efficiency.

Heated dry – As opposed to ‘air fluff’, we’re talking clothes dryers here.

Heating element – the electric resistance units used to provide the heating in range surface units, bake and broil elements, dryer elements, coffeemakers, waffle irons, hair dryers, etc.

High limit thermostat – A safety device that ‘backs up’ the control thermostat in dryers. Often used in built in ovens as well, to ensure that temperatures inside a kitchen cabinet stay within safe limits.

High side – The condenser, drier-filter, and capillary line in refrigerant systems. ‘High’ refers to the pressure inside this portion of the system, and the compressor is commonly included in this definition. The ‘low side’ (which see) refers to the low pressure ‘half’ of a system.

Horizontal axis – This describes a ‘frontload’ clothes washer with a drum, or basket, that spins around a, well, horizontal axis. There's also a fairly new kid on the block: a top load/horizontal axis washer, made by Staber Corp.

Hose washer – The rubber washer in the end of a washer fill hose, that is compressed against the faucet rim, and prevents water leakage from that area. Identical to those used in garden hoses.

Hot tube – Another word for the ‘Yoder Loop’ used in refrigerators, this is just a pass of the condenser tubing (runs very warm) that is routed through a cabinet, usually around the front edge, to prevent condensation from forming in this area. Uses no electricity to accomplish this, unlike previous designs that used electric heaters for the same job.

Humidistat – Similar to a thermostat, except this switch cycles based on humidity rather than temperature. Used in humidifiers and dehumidifiers, of course, to turn them on/off.

HV (high voltage) Capacitor – A microwave oven component used in the voltage doubling circuit of the high voltage section that fires the magnetron. A common rating is 1uf @ 2500 volts.

HV diode (rectifier) – Another device used in a microwave oven’s voltage doubler to efficiently provide sufficient voltage ‘step-up’ to the magetron.

HV transformer – Providing most of the weight of a microwave oven, this big  transformer raises 120 volts AC to 1000 volts or more before sending it on to the doubler, which, well, doubles it! Don’t play with one of these if you don’t know what you’re doing.

Hydrator cover – Also called the ‘crisper cover’, this is just that bottom shelf – was made of heavy glass for years, but is usually plastic these days – that covers the veggie drawers. Most also have the drawer tracks molded into them.

Hydrator (Crisper) – A drawer or compartment, usually located in the bottom of a refrigerator (coldest spot), that is maintained to higher humidity than the rest of the interior. Its job is to help keep fruit and veggies fresh for as long as possible.

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