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Serial Number: A twelve digit number on the identification sticker
on the outside of the heater cabinet. Needed for all records, war-
ranty request etc.
Shadow-Box Fence: A fence that is made to allow air to pass
through it freely without restriction.
Shock Treatment: Adding a larger than normal dose of chlorine to
the pool water to kill contaminates, algae and to remove combined
chlorine.
Short Cycle: The act of the compressor going on and off without
letting the refrigerant gas to settle.
Short Term Freeze: When the outside air temperature drops below
36 degrees for a short period of time, usually for only a few days
or so, but not part of a normal seasonal change where lower tem-
peratures are expected as a norm.
Sodium Hypochlorite: A liquid form of chlorine.
Skimmer: A housing mounted at the pool water level in the pool
wall and deck, that is used to capture debris as water is drawn into
it. The water is drawn in by the suction created by the circulation
pump.
Skimmer Basket: The strainer type debris catch, inside the skim-
mer housing that keeps debris from clogging other related equip-
ment.
Skimmer Inlet: The square opening right at the pool water level,
flush with the pool wall.
Skimmer Throat: The main cavity of the skimmer where the skim-
mer basket is located.
Solar Panels: A manifold placed on a roof top, to collect heat from
the sun and transfer it to the pool water being pumped through it.
Spa: a smaller body of water using hotter water temperature and
high pressure water flow mixed with air to create a therapy effect.
Sprinkler Heads: Irrigation water distribution device, placed in ar-
eas of the yard that broadcast water to the surrounding area.
Surge Tank: Part of a filtering system that holds a specific amount
of water to supply the circulation pump. Filter elements are some-
times placed in this tank so when the pump suctions water through
them it cleans the water. This tank is fed pool water through plumb-
ing piped from the pool by gravity.
Temperature Rise/Difference: A calculation used to determine how
many degrees the water passing through the heat exchanger is in-
creased in order to set it at a prescribed difference.
Thermometer: Used to determine the actual pool or spa water tem-
perature. Sometimes a floating type or a tie on type.
Thermostat: Located on the unit itself, used to set the desired tem-
perature you would like the actual pool or spa water to be.
The unit will activate if the water temperature is below the set-
ting. The unit will shut off when the water temperature has reached
that particular setting.
Three-Way Valve: A plumbing valve that controls water flow hav-
ing three ports in which to connect plumbing to.
Timer: A timing device that activates the water circulation pump
according to preset times.
Time Delay: A device inside the heater, that will delay the com-
pressor from running until the refrigerant gas and crank case oil
settle, before allowing the compressor to run, preventing damage
to the compressor..
Trickle Type Sprinkler: An irrigation distributor that does not broad-
cast water into the air but slowly waters the surrounding ground
directly.
Vacuum Type Filter: A filter on the suction side of the circulation
pump usually mounted inside a surge tank. Water is drawn through
the filter media trapping debris.
Variable Rate Flow Control Valve: The "internal" valve used to as
a bypass for the heater water flow. This spring type valve will
automatically adjust the water flow rate to the unit when the flow
rate changes for what ever reason, (30 to 70 G.P.M. range).
Water Coil: Same as heat exchanger.
Water Chemical Balance: The standard pool water test and chemi-
cal amounts and values, that the water needs to be considered bal-
anced, according to standard practice.
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