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B-3
OPERATION
B-3
- Abrasion failure due to particulate in coolant.
- Corrosion failure due to deionized water and pure
glycol mixtures.
- Cavitation failure due to air bubbles introduced by
an intake screen ( or any other source).
- Dry operation failure due to the reservoir being emp-
tied.
- Over pressure failure due to crimping or blocking of
water hoses.
- Catastrophic sudden failure due to wear of carbon
vanes in turbine pumps.
The spring actuated normally closed pressure switch
is located at the top of the pump head. The springs
sense a pressure buildup in the pump head and, with
a buildup of pressure above the operating pressure,
enable the switch which shuts off power to the fan
motor and pump motor. The pressure switch allows
the Cooler to run intermittently “On Demand” when
connected to a water valve or solenoid only providing
cooling water when it is needed. This feature saves
energy, but more importantly, drastically increases
pump and fan motor life. For best operation, no delay
time should exist from the time flow stops and when
the pump is turned off. (Refer to “Magnum System
Monitor” Section).
PUMP FAILURE
Magnum Cooler pumps are designed to fail “soft” so
that welding can continue until a repair is made. In the
unlikely event of a “soft” pump failure, water will slowly
leak from the pump head and drip out the case sides
of the unit. The internal electrical components are iso-
lated away from the pump and are in no danger from
the leak. S20095-1 and S20095-3 Pump Replacement
Kits and S20095-2 Pump Rebuild Kit are available for
repair of the pump. The only tool required is a Phillips
head screwdriver.
COOLING EFFICIENCY
The high cooling efficiency of Magnum Coolers offers
a cooler, more comfortable gun or torch than conven-
tional air cooled procedures as well as leading com-
petitors water cooled systems. The heat exchanger’s
corrugated fin improves heat convection transfer while
minimizing air flow restriction. This design offers a
durable construction capable of withstanding impact of
objects through air slots. Table 3 states the recom-
mended use and cooling rate for 10-I and 20-I Cooler
models. Refer to Figure 9 for a description of how
Magnum Coolers perform.
The Magnum Cooler effectively removes the heat of
the arc away from the gun or torch handle and places
it into the exiting air flow at the back of the Cooler.
Outside temperature can affect the cooling perfor-
mance of a Magnum Cooler.
For example:
A. COOL day (50°F, 10°C): More HEAT is trans-
ferred from the water in the heat exchanger to the
air. The water is COOLER and more HEAT is
transferred from the gun or torch to the water.
RESULT: THE GUN OR TORCH FEELS COOL-
ER
B. HOT day (100°F, 38°C): Less HEAT is transferred
from the water in the heat exchanger to the air.
The water is HOTTER and less HEAT is trans-
ferred from the gun or torch to the water.
RESULT: THE GUN OR TORCH FEELS HOT-
TER.
Unlike other water coolers that depend on bulky reser-
voir size, the high efficiency components of Magnum
Coolers allows the reservoir size to be small. The
result is a lightweight, portable unit.
MAGNUM COOLER 10-I & 20-I