Ferroli RMP series, Technical Manual, Page: 6 / 24

6
GENERAL FEATURES
Description of components
External structure . Basement, supporting structure and lateral
panels are made of galvanized and painted sheet-steel (colour
RAL 7035) to guarantee good resistance to atmospheric agents.
Accessibility to internal parts is possible removing the frontal
panel. For extraordinary manteinances also the rear panel can
be removed.
Refrigerant circuit . It is contained inside a compartment
separated from the air flow to simplify maintenance and control
operations.
The hermetic scroll
compressor (1) is mounted on damper
supports and is protected against overtemperatures and
overcurrents. It is equipped with an electrcal heater, that is
activated when the compressor turns off, to keep the compressor
crankcase oil temperature high enough to prevent migration of
the refrigerant during winter stops and to evaporate any liquid
present in the crankcase, in order to prevent possible liquid
rushes on starting (only heat pump models).
The plant side heat exchanger (2) is a brazed stainless steel
plate heat exchanger, properly insulated to avoid condensate
generation and to minimize thermal losses, and protected by a
differential pressure switch that detects whatever water flow lack.
It is moreover protected against freeze danger by an antifreeze
electrical heater.
The source side heat exchanger (3) is a finned coil realized with
grooved copper pipes and aluminium fins with notched profile to
increase the heat exchange coefficient. A tray is obtained in the
basement to collect the condensate generated in heating mode.
The expansion device (4), a thermostatic expansion valve with
external equalizer, allows the unit to adjust itself to the different
operating conditions keeping steady the set superheating.
The refrigerant circuit of each unit contains moreover solid
core hermetic filter dryer (5) to restrain impurity and moisture
residuals that could be present in the circuit, high and low
pressure switches in order to assure the compressor to
operate inside the permitted limits, 4 way reverse cycle valve
(6) to allow operating mode change reversing the refrigerant flow
(only heat pump models), liquid receiver (7) to compensate the
different refrigerant charge required in heating and in cooling
mode (only heat pump models) and pressure connections
SAE 5/16” - UNF 1/2” - 20 equipped with pin, gasket and
blind nut, as required for the use of R410A refrigerant (they
allow the complete check of the refrigerant circuit: compressor
inlet pressure, compressor outlet pressure and thermostatic
expansion valve upstream pressure).
The fans (8) are plug fan type fans equipped with EC direct
current motor and embedded inverter. The fans rotational speed
is modulated continuosly to control the condensation pressure
(in cooling) and the evaporation pressure (in heating) in order to
optimize the operating conditions of the unit and to reduce noise
emissions. The maximum rotational speed can be modified by
parameter in order to set the available static head of the fan to
the plant requirements.
Hydraulic circuit . All the pipes are thermally insulated to avoid
condensate generation and minimize thermal losses. The circuit
can be equipped with different kind of circulation pump (option).
In that case the circuit is also equipped with expansion vessel
and air vents. It is also possible to integrate inside the unit a buffer
tank arranged as buffer on the flow towards the plant (option). In
that case the circuit is equipped not only with expansion vessel
and air vents, but also with safety valve, automatic air vent and
drain cock.
Electrical panel . It contains all the power, control and security
components necessary to guarantee the unit to work properly.
The unit is managed by a microprocessor controller to which all
the electrical loads and the control devices are connected. The
user interface, placed on the frontal panel, allows to view and to
modify, if necessary, all the parameters of the unit.
All the units are supplied with an outdoor temperature sensor,
already installed on the unit, in order to realize the climatic
control.
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