CLIVET WSAN-XPR 21, Installation And Use Manual

M0G940E8-00 04/07/08 

pag 

15 

WATER CONNECTIONS

GENERAL 

Piping must be designed with the least possible number of 
bends and head variations. If the pressure chute of the 
installation is above the useful prevalence of the pump, the 
water delivery capacity is reduced as well as, as a 
consequence, the thermal exchange and the yield.  

INTERCEPTING VALVES 

Install on the input and output of the user parts 
(exchangers, coils, humidifiers, etc) So that it will be 
possible to carry out all the service operations and possible 
substitutions without emptying the installation. 

PRESSURE AND TEMPERATURE INDICATOR 

Install on the input and output of the user parts 
(exchangers, coils, humidifiers, etc) So that it will be 
possible to carry out all the service operations. 

AUTOMATIC OR MANUAL ESCAPE VALVES 

Install the highest points of tubes in a way that the air can 
escape form the circuit.  

BLEEDING COCK 

Install them at the lowest points of the circuit, so as to allow 
emptying. 

LEAKAGE TESTS 

Before performing the insulation of the tubes, carry out a 
leakage test. 

TUBE INSULATION  

All tubes of water must be insulated so that to avoid the 
formation of condensation and thermal dispersions along 
the tubes themselves. Verify that the insulation is the 
vapour coil type. The connections for the air escape and for 
the emptying must be out of the insulating thickness to 
assure the accessibilità. 

CONNECTIONS SUPPORTS 

The weight of the hydraulic connections must be supported 
in the exterior of the unit so as not to stress the connections 
of user devices (exchangers, coils, humidifiers, etc ) . 

ANTI-VIBRATION DEVICES 

In case of units with anti-vibration devices, it is necessary to 
assemble elastic joints, even on water connections. 

RISK OF FREEZE 

If the unit and the relevant water connections are subject to 
temperatures near 0°C:  

• 

mix the water of the system with glycol 

• 

protect the tubes with heating cables under the tubes 
insulation 

• 

empty the system by verifying that: 

o 

no taps are closed so they can not trap the water, 
even after emptying 

o 

there are no low points where the water can 
stagnate even after emptying; blow if necessary 

INTALLATION EMPTYING  

The refilling of the water present in the installation increase 
the oxidation phenomena and lime deposits.  
If necessary empty only the interested system section and 
anyway empty or refill the installation if necessary .  

EXPANSION TANK 

The installation must be kept at the right pressure by both 
an expansion tank and a combined valve of pressure 
reduction and discharge; if the components are present on 
the unit, they must be installed on the installation. The 
expansion tank must be dimensioned in function of the 
water in the installation. 

EXCHANGER USE SIDE 

FILTER 

It is very important for the water to be free of impurities. If it 
is not, the efficiency of thermal exchange is diminished. In 
worst cases, the exchanger can be irreparably damaged. If 
the filter is not present on the machine, it must be 
immediately installed upstream from the unit, in a position 
which can be easily reached for cleaning. 
The filter mesh must be :  

• 

< 1 mm unit with 1 compressor 

• 

< 1.5 mm multicompressor unit. 

FLOW SWITCH 

The flow switch must be present as a component of the 
system, so as to ensure shutdown of the unit if water is not 
circulating. It must be installed in a straight tract of the 
tubes, not near the elbows, which can generate harmful 
turbulence  

UNFREEZABLE LIQUIDS 

If the unit is used when the water temperature is lower than 
+ 4°C, avoid the formation of ice by using unfreezable 
liquids (ex. Ethilenic Glycol) in the necessary percentage. 
The use must also be determined for ambient temperatures 
near 0°C . 

ANTIFREEZE RESISTANCES  

If the unit is equipped with antifreeze resistances on the 
exchanger side (standard or optional according to the 
models), verify that they are electrically fed during periods 
that the machine is stopped (night, weekends, long stops) 

WASHING THE SYSTEM 

Carefully wash the system by using clean water and 
discharge it before connecting the unit.