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Cleaning fans
DANGER!
Pay attention to the fans. Do not remove the protective grids for any reason
whatsoever!
Check the fan grids making sure they are not obstructed by any objects and/
unit, in some cases causes the fans to break.
Checking compressor oil level
IMPORTANT!
Do not use the unit is the oil level in the compressor is low.
The lubricating oil level in the compressor can be checked by means of
the sight-glass. The oil level in the sight-glass can be inspected while all
compressors are running. At times a small amount of oil could migrate
can therefore be considered normal.
in any event, the oil level must always be visible through the sight-
glass. The presence of foam when the unit starts is normal. A prolonged
and excessive presence of foam during operation, on the other hand,
means that the refrigerant has not dissolved in the oil.
Inspecting and washing the tube and shell heat exchangers
(STE accessory)
IMPORTANT!
The acids used for washing the heat exchangers are toxic. Use suitable personal
protective equipment.
Tube and shell heat exchangers are not subject to fouling in rated
running conditions. The working temperatures of the unit, the
exchanging surface reduce fouling of the exchangers to a minimum.
Any incrustation of the exchanger may be detected by measuring the
pressure-drop between the inlet and outlet pipes, using a differential
pressure gauge. Any sludge that may form in the water circuit or any
conditions or high concentrations of any antifreeze solution used, may
In this case, it is necessary to wash the heat exchanger with suitable
chemical detergents. Provide already existing systems with adequate
charge and discharge connections. Use a tank containing weak acid:
5% phosphoric acid, or if the exchangers have to be cleaned often: 5%
oxalic acid. The liquid detergent must circulate around the exchanger
Section II :: Installation and maintenance
86
Special maintenance
These are all those repairs or replacements which allow the unit to keep
on working in standard conditions. The spare parts must be identical to
the previous ones.
cycle, carry out another cycle with clean detergent to complete the
operation. Before starting up the system again, rinse abundantly with
water to get rid of any traces of acid and bleed any air from the system;
if necessary start up the service pump.
IN
OUT
1
1
evaporator
2
acid solution tank
3
cut-off gate valve
4
auxiliary cock
5
wash pump
6
7
user
IMPORTANT!
Maintenance is reserved exclusively for skilled personnel from workshops
close attention to the danger signs on the unit. Use the personal protective
equipment foreseen by current laws. Pay the utmost attention to the symbols
located on the unit. Use EXCLUSIVELY original RHOSS S.p.a. spare parts.
7
3
3
6
4
2
4
5
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