Unit installation

Use and Maintenance Manual Air-cooled water chillers and Heat Pumps R-PAE/R-PAH/EAH Rev. 1 del 03/09
5.7.11 Belts tension check – belts replacement
While making the check, the unit main switch must be open (“0” position) and locked. The padlock key
must be kept by the person in charge of the check.
Centrifugal fans belts must be checked at regular intervals and must be replaced every two years of operation.
Press firmly the belt in the middle between the two pulleys: it must give way no more than 5 mm; if it gives way more
than that, unblock the motor tightening screws, unscrew the belt-tensioner bolt after screwing the other belt tensioner
bolt on the opposite side of the motor. Tighten the belt correctly, make sure the pulley engine is aligned to the duct
(use the bolt on the opposite side of the belt tensioner to make it easier), overflow the motor on the base. To replace
the belt, loosen the motor tightening screws, screw completely the belt tensioner bolt and close the motor to the fan
housing, remove the belt from the pulleys, replace it with another belt having same form and size and tighten as above
mentioned explained. In case of belt replacement, re-check the belt tension after a couple of days of operation.
5.7.12 Humidity check of cooling circuit
Humidity inside the cooling circuit can cause many troubles (ice formation inside the expansion valve, acidification of
compressors oil, etc.), therefore it is important to intervene immediately if this problem occurs. The cooling circuits are
equipped with a light able to signal when humidity is present in the circuit; the sensor material located at the centre or
on the border of the sight glass is bright green to signal a dry circuit or yellow to signal a wet circuit. On the sight glass
the two referring colours for each status (dry / wet) are shown. If foam or bubbles can be seen through the sight glass,
the refrigerant charge could be insufficient. This could be a sign for a refrigerant leak, then it is necessary to inform
EMICON A.C. S.p.A After Sales Service. If humidity is detected inside the circuit, contact immediately EMICON A.C.
S.p.A After Sales Service for repairing it.
5.7.13 Check of supply continuity to the crankcase heater
The unit main switch must be open (”O” position).
The compressors crankcase heater is essential to keep the oil free from refrigerant parts which
otherswise might lead to possible seizure of compressor; the check must be performed by a common
continuity tester checking there is supply continuity to the terminals after unplugging one of them from the
terminal board. In case a supply interruption is detected, contact immediately EMICON A.C. S. p. A. After
Sales Service for the shipment of the spare part of for the repair operation.
5.7.14 Regulation of overload protection relays
All electric motors are protected against overcurrent to prevent damage from over-loading the motor; for this reason, it
is possible to install a regulation system which can interrupt current in case of overload or damage.
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