CELTIPOL CHL-400, Technical Manual

Page: 47 / 61

47
CHL-400 TECHNICAL MANUAL
07-2022
Translation of the original manual
It is very important to turn the general switch (a) to the OFF position and / or
disconnect the machine from the electric current before handling the elements inside
the electrical panel. It is very important to turn the general switch (a) to the OFF
position and / or disconnect the machine from the electric current before handling
the elements inside the electrical panel.
5. Unbalanced pressures:
Decompensation of pressures occurs when an obstruction in the hose or in the gun
prevents one of the components to be freely released through the gun chamber
when projected or when a problem in the pumping system prevents one of the
components from being able to reach the gun in the required amount.
To determine whether decompensation occurs as a result of an obstruction or as a
result of a problem in the pumping system, project with the gun, observe the
pressure indicated on the pressure on the pressure gage (
q,v ) in the other
component: if the pressure of the missing component is higher, decompensation is
the result of an obstruction. If the pressure is lower, decompensation is the result of
a problem in the pumping system.
6. Cavitation
Cavitation occurs when the pumping system requires a greater volume of material than
that supplied by the feeding system, leading to the formation of a vacuum in the dosing
pump. The causes that can cause cavitation are as follows:
a. The transfer pump fails to supply the required volume. The problem may be
that the pump does not meet the required characteristics, the lack of air
supply to the pump or that the pump is faulty. A 2:1 ratio pump is
recommended for isocyanate transfer and a supply hose with a minimum
internal diameter of 20mm.
b. High viscosity. Polyurethane foaming systems normally require a minimum
transfer temperature of 12ºC. With lower temperatures, the product
increases its viscosity making pumping difficult. When environmental
conditions do not allow the products to be kept at a minimum temperature of
12ºC, auxiliary heating elements must be used to adapt the products to the
minimum temperature required for transfer.
c. The product inlet filter is obstructed (ref.2100).
d. There has been wear and tear on the gaskets or pump seals preventing the
supply of the required product.