Unit installation

Use and Maintenance Manual Air-cooled water chillers and Heat Pumps R-PAE/R-PAH/EAH Rev. 1 del 03/09
5.7.1 Coils cleaning (on the floor and under coverings)
Use a stiff-bristle brush and the necessary equipment; the use of an industrial vacuum cleaner may facilitate this
operation.
a. Disconnect the unit from the power supply by opening the main switch,
b. Remove the protection grid from the coil (if present),
c. Brush the coil from the top to the bottom, being careful not to damage the fins.
d. Accompany the brushing with the hoovering.
e. Remove the dust and the down gathered.
Do not use compressed air (it might damage the fins) or water (it might cause scale).
5.7.2 Check of the hydraulic circuit and expansion vessel pressure
The hydraulic circuit pressure is determined by an expansion vessel and it is signalled outside the unit through a
manometer. The pressure shown on the manometer must range between 0,15 and 0,30 MPa (1,5 and 3,0 bar).
If the circulating pump and/or the tank are installed on the unit, then the manometer and the
expansion vessel equipped with a water fill valve (visible in the picture below the manometer) are
also provided with the unit; on the contrary, it is the customer who must take care about their
installation.
5.7.3 Check of lubricant leaks – lubrication oil pressure
A lubricant oil leak in a cooling circuit is always accompanied by a refrigerant leak, therefore this check allows to detect
possible leaks in advance. The inspection is visual-type and it is sufficient to light the areas to be checked by means of
a good electric torch. All piping fittings and joints (welded and not welded) must be checked since they are more
subject to vibration; if some oil is detected, contact the closest After Sale Centre for intervention. The lubrication oil
pressure must be checked through the appropriate manometer (when present); the oil pressure must always be at
least 0,15 MPa (1,5 bar) higher than the value shown on the low pressure gauge (L.P.).
5.7.4 Vibrations check
The cooling circuit is composed of several rotating parts (fans, compressors, pumps, etc) equipped with bearings and
they are balanced at the beginning; excessive vibrations, scrapings, strikings, irregular noises such as whistles and
creakings are all signals of mechanical troubles which might even generate serious and dangerous damages. The
inspection must be performed while the unit is working and with the protection covers closed; in case of trouble,
contact the closest technical service centre.
5.7.5 Check of terminals tightening
The vibrations the unit housing is subject to (and the electric box by transmission) can loosen the electric terminals
thus causing malfunctionings; therefore, open the unit main switch and tighten all terminals screws; eventually, if it is
always the same terminals to be loosened, contact the After Sales Service of EMICON A.C. S.p.A to report the fact.
5.7.6 Check of the safety water flow switch
The safety water flow switch detects the water pressure difference between the exchanger inlet and outlet. If the tube
marked by the white arrow is clogged by dirt or air (or is bended rudely and it chokes), the safety water flow switch
might stop detecting the pressure change and the system stops. Check the tube condition, make sure it is cleaned, the
piping fittings do not leak and discharge any air, if present.
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