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PRODUCT INFORMATION
INDEX
DATE
Dep. 2
IT-G-A-20-025e
September 2014
ONE CIRCUIT COOLING SYSTEM FOR GAS V-ENGINES
O&M_2.002211.810_A_10_2016
3.5 WATER PREHEATING SYSTEM
This is an auxiliary system that allows the engine cooling water to be at the optimum temperature when the
engine starts from cold. This system consists of a heating element that heats up the water and, occasionally,
an auxiliary water pump that distributes the water throughout the engine. See IT-C-A-20-009.
3.6 WATER TEMPERATURE REGULATOR
The temperature of the water in the circuit needs to be controlled in order to stay at the right temperature.
This can be done by means of thermostatic valves that are installed in a thermostat box or by electronic
regulation using 3-way valves.
Temperature regulation using thermostatic valves is generally used for cases where precise temperature
control is needed, as they control ranges from 8 to 10ºC. Electronic regulation is used for cases where
precise temperature control is needed, in heat recovery applications for example.
3.6.1 CAJA DE TERMOSTATOS CIRCUITO PRINCIPAL
The thermostat housing is located at the front of the engine and contains seven thermostatic valves whose
function is to maintain the water temperature in the engine within a range (80-90 ° C).
If the temperature is lower than the desired most of the water is directed back to the suction of the main
pump to re-enter the engine.
However a small amount of cooling water always circulates through the external thermostat housing cooling
element. This slight flow of water that is allowed to pass is used to trap air, avoiding the formation of air
pockets in the coolant circuit.
When the cooling water temperature exceeds the starting temperature of opening of the thermostat, water
flowing through the thermostatic valves and out to the external cooling system..
Figure 7– Thermostate housing.
2.2.6
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