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Free cooling purge valve related
The purge valves locate at four corners of the free cooling MCH are used for air purging and water purging. The below
instruction is defined to protect the purge valve from deformation and/or failure.
After dismounting the cap, please refer to the below to reinstall the cap:
Check and clean the screw if there is dust and debris on screw's surface
-
-
Check the rubber o-ring in the cap and make sure that it is in the cap and in the right position
-
Screw the purge valve with one circle by hand and make sure the screw match is well.
-
Clockwise screw the purge valve with torque wrench. Make sure the torque should be applied around the screw
axis. The eccentric torque might damage the screw.
-
Operation torque:
o
The maximum torque which can be applied to the purge valve shall not exceed 10 Nm
o
The recommended torque value to install the cap is 5 Nm
The purge valves are protrusions from the coil.
Pay attention to not let the purge valve be impacted during transportation and installation process.
Operations in case of failure
In case of free cooling coil breakage,
1.
Empty the unit
Close valve 1 and valve "d" (see Fig. 25)
2.
3.
Isolate the failed coil/coils which need to be replaced
4.
Close the coil so to avoir air entrance inside it and any trace of humidity
5.
Pressurize all coils with nitrogen at 1-2 barg
Please note that free cooling MCH coil cannot be exposed to open air for too long due to possible
humidity entrance.
4.9
Evaporator and heat recovery exchangers anti-freeze protection
All evaporators are supplied with a thermostatically controlled anti-freeze electrical resistance, which provides the correct
anti-freeze protection at temperatures lower than –16°C.
However, unless the heat exchangers are completely empty and cleaned with anti-freeze solution, additional methods
must also be used against freezing.
Two or more of below protection methods shall be considered when designing the system as a whole:
−
Continuous water flow circulation inside piping and exchangers
−
Addition of an appropriate amount of glycol inside the water circuit
−
Additional heat insulation and heating of exposed piping
−
Emptying and cleaning of the heat exchanger during the winter season
It is responsibility of the installer and/or of local maintenance personnel to ensure that described
anti-freeze methods are used.
Make sure that appropriate anti-freeze protection is maintained at all times.
Failing to follow the instructions above could result in unit damage. Damage caused by freezing is
not covered by the warranty.
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