Introduction
of cooling system
a. The genset with
medium and high standard configuration adopts closed circulation liquid cooling
mode with its own fan. The cooling system circulation loop basically consists
of the following parts: water pump; waterway between the engine cylinder block
and the cylinder head; thermostat; bypass pipe between the thermostat body and
the water pump; water tank radiator; pipeline and hose; lubricating oil cooler.
b. Medium and high
non-standard configuration genset, such as split water tank type unit, water
tank radiator should be replaced by heat exchanger, while there are expansion
tank and remote tank, such as the remote tank installation position is
relatively high, the transition tank should be added, to prevent the heat
exchanger from being damaged due to excessive internal pressure.
c. In addition, all
medium and high generator sets can be separately equipped with coolant
filtration device upon user’s request. The device has two functions: A, block
all impurities in the coolant and prevent scale formation in the cooling
system; B, improve the corrosion protection performance of the coolant.
d. All kinds of dirt on
the radiator chip can greatly reduce the cooling performance of the radiator.
Therefore, in a dusty environment, it is necessary to clean the radiator
frequently.
Coolant
The gen set coolant has
the following three functions:
A, provides sufficient
heat transfer capability;
B, prevents all metal
materials in the cooling system from rusting;
C, provides adequate
frost protection.
The coolant can be
composed of water and antifreeze or a mixture of water and rust preventive.
Among them, the PH of water should be between 6.5 and 8, and pure water is
usually recommended. Do not use water alone as coolant. In areas where there is
a risk of freezing, the coolant should contain 40% to 60% antifreeze. When the
antifreeze content is 40%, the freezing point can be reduced to -25°C. When the
antifreeze content is 60%, it can be reduced
to -56°C. It is suggested that the users use a mixture of 50% antifreeze
(ethylene glycol) and 50% purified water, and should be separately prepared in
an independent container, and then mixed
evenly before adding to the water tank. It is not recommended to add more than 60%
antifreeze to the coolant, otherwise it will reduce the antifreeze protection
of the diesel generator set. It is recommended to use ethylene glycol as
antifreeze.
Anti-rust liquid should
be used instead of antifreeze in areas where there is no risk of icing. When
the mixing ratio of the anti-rust liquid and the purified water is about 1:30,
the anti-rust effect can be achieved, and the cooling efficiency of the unit
will not be reduced. After adding the anti-rust liquid, the unit should be run
to the heat engine state in order to abtain the best anti-corrosion protection.
Glycol is recommended as the unit anti-rust liquid.
Do not mix any type of
antifreeze with rust preventive and other additives, as this will reduce the
cooling efficiency by producing a large amount of foam. Antifreeze and
anti-rust liquid are dangerous. Do not drink them. Avoid contact with skin and
eyes. Do not use alcohol in the cooling system.
Coolant
drain
When using ambient
temperature <5°C or
long-term shutdown, must use the antifreeze approved by the engine manufacturer,
add it according to the proportion, or drain the coolant. The discharge
sequence is: cooling water tank →
body → circulating
water pump →
(intercooler) → (water
jacket preheater). Different models have different water discharge points.
Coolant
replacement
The coolant should be
replaced at least once every six months to avoid degradation of cooling
performance due to precipitation in the cooling system. Another reason for
replacing the coolant is to avoid the risk of corrosion of the generating set,
as over time the rust will reduce the effectiveness of the additive and disable
the water temperature sensor.
When replacing the
coolant, the system should be flushed with clean water first. When cleaning, be
sure to wait for the flushed water to be very clean.
The coolant should not
be added until the diesel engine is shut down and completely cooled. Do not
open the filler cap when the engine temperature is still high, except in an
emergency. Otherwise steam or high temperature coolant may be ejected.
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