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NOTES:
1)
Approach temperature (the difference between the leaving water temperature and the saturated refrigerant temperature) of
either the
condenser or evaporator is a good indication of tube fouling, particularly in the condenser, where constant flow
usually prevails. McQuay's high efficiency heat exchangers have very low design approach temperatures, in the order of one to
one and one half degrees F.
2)
The chiller unit controller can display the water and the saturated refrigerant temperatures. Simple subtraction will give the
approach. It is recommended that benchmark readings (including condenser pressure drop to confirm future flow rates) be taken
during startup and then periodically afterward. An approach increase of two-degrees or more would indicate that excessive tube
fouling could be present. Higher than normal discharge pressure and motor current are also good indicators
3)
Evaporators in closed fluid circuits with treated water or anti-freeze are not normally subject to fouling, hover it is prudent to
check the approach periodically.
4)
Performed when contracted for, not part of standard initial warranty service.
This manual is a technical aid and does not represent a binding offer. The content cannot be held as explicitly or implicitly guaranteed
as complete, precise or reliable. All data and specifications contained herein may be modified without notice. The data communicated at
the moment of the order shall hold firm.
The manufacturer shall assume no liability whatsoever for any direct or indirect damage, in the widest sense of the term, ensuing from
or connected with the use and/or interpretation of this manual.
We reserve the right to make changes in design and construction at any time without notice, thus the cover picture is not binding.
D - EIMWC01104-12EU - 14/148
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