MCH36 Silent Touch
Nuvair
Page 40
www.Nuvair.com
13.17 Changing Flex Hoses
The hoses must be changed periodically (every 5 years or every 3000 hours) or when they show signs of
abrasion/wear/damage. The bending radius of the hoses must not be less than 250 mm (9.8 in).
Do not carry out these tasks if the compressor has just shut down and is hot; wait for the compressor
to cool. All maintenance work must be carried out with the compressor OFF and the power supply
lead unplugged from the wall socket.
Depressurize the entire compressor circuit before carrying out any maintenance tasks. To
depressurize the compressor, open the drain valve (a,
Tank refill pressure is very high. Therefore, before refilling the tanks check that hoses are correctly connected
and in good condition. Check also that the valves on any unused hoses are closed properly to prevent the
dangers associated with hose whipping.
When the tanks are being refilled, unauthorized personnel must remain at a
distance of at least 3 meters (10 feet). It is strictly forbidden to disconnect the hoses
from the fittings or refill valve when the machine is under pressure.
To change the tank refill hoses, proceed as follows:
•
Disconnect the bottle refill hoses by unscrewing the fittings (17 mm wrench).
•
Replace the old hoses with new ones.
•
Screw the hoses onto the connectors (a, Figure 31).
•
Use a dynamometric wrench to tighten the hoses on the compressor with a
torque of 15 Nm.
13.18 Safety Valves
The safety valves must be replaced every 10 years or 5000 hours. There are four safety valves installed on the
compressor. Each safety valve is set to the pressure value shown in Figure 32.
Tampering with the safety valve to increase the pressure setting is strictly forbidden. Tampering with
the safety valve can seriously damage the compressor, cause serious injury to personnel and renders
the warranty null and void.
Should safety valves fail to work properly, contact Nuvair for technical assistance.
Figure 31. Tank refill hose
change.
