Carrier 30RQS039 Installation, Operation And Maintenance Instructions Download Page 43

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15 - MAJOR SYSTEM COMPONENTS

15.1 - Compressors

30RQS/RQSY units use hermetic scroll compressors. Each
compressor is equipped with a crankcase oil heater, as
standard.

Each compressor sub-function is equipped with:

•

Anti-vibration mountings between the unit chassis and
the chassis of the compressor sub-function.

•

A single pressure safety switch at the discharge.

15.2 - Lubricant

The compressors installed in these units have a specific oil
charge, indicated on the name plate of each compressor.

The oil level check must be done with the unit switched off,
when then suction and discharge pressures are equalised. The
oil level must be visible and above the middle of the sight-
glass in the oil equalisation line. If this is not the case, there
is an oil leak in the circuit. Search and repair the leak, then
recharge oil, so that it reaches a level between the middle and
three quarters of the sight-glass (unit in vacuum).

ATTENTION: Too much oil in the circuit can cause a unit
defect. R-22 oils are absolutely not compatible with R-410A
oils and vice versa.

NOTE: Use only oils which have been approved for the
compressors. Never use oils which have been exposed to air.

15.3 - Air evaporator/condenser

The 30RQS/RQSY coils are heat exchangers with internally
grooved copper tubes with aluminium fins. To prevent ice
formation at the bottom of the coils, electric heaters are
installed under the sheet metal base. They are switched on,
based on the outside temperature.

15.4 - Fans

The fans are axial Flying Bird fans equipped with rotating
shroud and made of composite recyclable material. The
motors are three-phase, with permanently lubricated bearings
and insulation class F. See table below.

15.5 - Electronic expansion valve (EXV)

The EXV is equipped with a stepper motor (2625 + 160 /- 0
steps) that is controlled via the EXV board.

15.6 - Moisture indicator

Located on the liquid line, permits control of the unit charge
and indicates moisture in the circuit. The presence of bubbles
in the sight-glass indicates an insufficient charge or non-
condensables in the system. The presence of moisture changes
the colour of the indicator paper in the sight-glass.

15.7 - Filter drier

This is a one-piece, brazed filter drier, located in the liquid
line. The role of the filter drier is to keep the circuit clean and
moisture-free. The moisture indicator shows when it is necessary
to change the filter drier. The filter drier is a bi-flow device, that
means that it filters and dehydrates in both operating modes.
The pressure drop is much higher in the heating mode. A
difference in temperature between the filter inlet and outlet
shows that the element is dirty.

According to the Regulation No. 327/2011 implementing Directive 2009/125/EC with regard to ecodesign requirements for
fans driven by motors with an electric input power between 125 W and 500 kW.

Product/option

30RQS standard* or

with option 15LS

30RQS standard**

30RQSY standard or 30RQS

standard with option 42

Global fan efficiency

36.6

38.0

39.8

Measurement category

Efficiency category