4
· AR Model
– Reserve liquid receiver.
– Thermostatic pressure reducer with pressure
balancing.
– Liquid indicator and valve on liquid line.
– Shut off valves on indoor unit and outdoor
condensing unit (UC) for refrigerant pipes.
– Outdoor condensing unit with copper tube and
aluminium fins.
3.4 Ventilation / Filters
• Blower equipped with two, direct drive, centrifugal
fans with double air intakes.
• Standard 3 speed fan motor (VS) switchable from
the electrical terminal box (refer to electrical con-
nections).
• Specific “High Speed Ventilation” (FV) motor
available as an optional extra.
• Cooling fan assembly mounted on a sliding chassis
with anti-vibration seals for easy maintenance.
• M1 flame retardant re-usable filters, made of
synthetic fibres, with a metal frame and protective
grille.
• UC single phase, 400 V/230 V dual voltage
switchable fan motors (operating on 230 V – 50Hz).
• UC large diameter fan blower with direct drive and
low rational speed (650 r.p.m.)
3.5 Electricity / Safety
Manufactured in large series, these air conditioners
undergo numerous controls during fabrication and
are systematically tested before delivery. Safety
devices effectively protect this equipment :
• Protection of the compressor with fuses, thermal
relay and electronic anti- short cycle timer.
• Protection of the integrated heater (accessory) with
fuses and dual automatic and manual reset overload
protection devices.
• Fuses on the control circuit.
• Protection of the fan motors (VS and FV) by fuses
and an internal safety device.
• Low pressure pressostats with automatic reset and
high pressure pressostats with manual reset.
• Solenoid shut off valve on the liquid line (
AR
model).
• Crankcase heater as standard on the air cooled
models.
• Protection of the UC fan motor with internal ther-
mostat.
• Mains power supply 3 N ~ 400 V – 50 Hz as stan-
dard and 3 ~ 230 V – 50 Hz as an option.
• Terminal block for single phase 230 V power supply
to the control circuit with a 400 V / 230 V transfor-
mer (not supplied) if the neutral wire is not available.
3.6 Control / Regulation
• Fascia grouping the controls (Main “ON/OFF” switch
with control light – Heating “ON/OFF” and Cooling
“ON/OFF”) and the regulation (inverting thermos-
tat).
• Automatic cooling/heating with neutral zone ther-
mostat supplied with the integrated electric heater
accessory.
• Remote control with integrated inverting thermos-
tat with the additional possibility of ventilation control
(
VA
or
VB
connection).
•
VA
connection: Continuous ventilation during
cooling and heating
•
VB
connection: Ventilation regulated during heating
and continuous ventilation during cooling.
• “ALL SEASONS” system (accessory) controlling the
condensing pressure; allowing cooling on the
AR
models down to –10° C outdoor temperature.
4. AFTER SALES SERVICE / MAINTENANCE
CAUTION
Procedures for working on the cooling
circuit, and the technical charac-
teristics, are different from the R22.
Consult the corresponding instructions
and follow the recommendations when
carrying out any work.
Access to the air filters is from the front after removal
of the air intake grille.
All the refrigeration, electrical and ventilation devices
are easily accessible from the front of the unit after
removal of the front panels.
Every accessory is supplied with fitting instructions
(and adjustment instructions, if necessary).
The technical data, installation instructions, mainte-
nance and operation instructions, exploded views and
spare parts lists are available on request .
