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4.3.1 Components
Motor and Pump Head: A 1/4 hp induction motor is used to drive the pump head. The motor is thermally
protected as well as fused on the mains transformer, T1 secondary. Refer to the Interlock schematic for details.
The pump head is a positive displacement, graphite vane pump. This pump uses the water as a lubricant and
must never be run dry. The pump and motor are shaft coupled and mounted inside the chassis on the left rear
side. A manifold is attached to the pump head which routes the water through the system as shown in the
coolant flow diagram.
Particle Filter: a replaceable filter 5µm particle filter is installed in the coolant loop to trap any particles larger
than 5µm in size. Particles may come from dirty water, non deionized water, dirty water containers, teflon
tape and pipe dope used in the plumbing system, pump head wear and from metal corrosion within the
coolant loop. Normally the water should remain clean and the filter element should be white in coloer. Brown
discoloration typically indicates dirty water and metal corrosion. Black discoloration typically indicates pump
head wear. All water is directed through the particle filter each pass.
DI Cartridge: A replaceable deionizing cartridge is installed in the coolant loop to remove any ion charged
particles in the water. Charged particles ay cause galvonic corrosion when in contact with dissimilar metals as
well as high voltage arcing in the flashlamp cavity. Charged particles usually come from using non deionized
water and from absorption of metal atoms in the cooling system. Systems that do not operate often or have
been filled with non deionized water will have highly conductive water, which over time, will be reduced as a
portion of the water is directed through the deionizing cartridge with each pass.
Heat Exchanger: A four row copper heat exchanger (radiator) is installed at the bottom of the chassis. All of
the water is passed through the radiator, directly from the flashlamp cavity. Heat from the water is absorbed
by the copper and dissipated through convection to cool the water. Once out of the heat exchanger, the water
returns to the main reservoir (tank). The radiator also contains a drain fitting and hose, which enables the
system to be drained. Once filled, draining will still leave small amounts of water in the cooling loop. If the
system is hen exposed to freezing temperatures, these pockets of water can freeze, expanding to create failures
in the solid portions of the coolant loop (especially the heat exchanger).
Air Fan/Motor: An electronically speed controlled induction motor is directly shaft coupled to an impeller
type rotary fan which is mounted above the heat exchanger. The rotation of the impeller is such that it draws
(the coldest) air up from the floor through the exchanger out the sides and rear of the console. As the air
temperature increases, the rotational speed (RPM) of the fan is increased. The pressure drop across the heat
exchanger, area of the heat exchanger, volume of air flow through the heat exchanger and the ambient air
temperature all have an effect on the cooling performance of the entire system.
Main Reservoir (tank): Mounted directly above the heat exchanger, the main reservoir contains the majority of
the water. The water comes in from the heat exchanger and is stored here until drawn up by the pump head.
Fill Reservoir (tank): A small white fill reservoir is mounted behind the laser head under the console top
cover. This fill tank should be 1/2 full after the air is removed from the cooling system. A yellow cap on the
tank prevents the water from spilling out.
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