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AH-New
condensing air handling unit
8
code HG0310.05GB ed.A-2010
AH
9
code HG0310.05GB ed.A-2010
AH
3.
TECHNICAL FEATURES
3.1.
Main Components
AH air handling units are designed for indoor air heating. AH
units are available for low or high pressures, for indoor or outdoor
installation and consist of:
•
PCH module (heater with stainless steel condensing heat
exchanger and premix burner)
•
Centrifugal fans with permanent magnet electronic motor
and inverter (800 W or 2000 W)
•
Frame made of Magnelis
®
sheet (special surface treatment)
•
Pre-painted, white sheet panelling
•
Safety Devices and Controls
•
Smart Web remote control
PCH module
The PCH condensing module, integrated in the machine, is made
entirely of stainless steel. It is controlled by the monitoring and
adjusting PCB CPU-PLUS that manages its switching on and
off, burner modulation and fault indication. In the modulating
operating mode the thermal output and, therefore, the heat
output (fuel consumption) vary according to the heat demand.
When the heat demand from the environment reduces, the
heater uses less gas and increases its efficiency - up to 108%
(a Net caloric value).
The heat exchanger complies with construction requirements
set by standard EN17082 for equipment where combustion
gases produce condensate.
The combustion chamber and the surfaces in contact with
condensation (such as the pipe bundle and exhaust hood),
are made of AISI 441, in order to provide high resistance to
condensation and temperature.
The following table shows the conversion of stainless steels used:
USA-AIS
EN-No.
COMPOSITION
AISI 441
1.4509
X2 CrTiNb 18
Ventilation
Air handling is controlled by the centrifugal fans with permanent
magnet electronic motor and high-efficiency inverter, powered
with direct current with integrated rotation speed control.
All the motors of the centrifugal fans used have the following
features:
•
Supply
230V - single-phase - 50 Hz
•
Manufacturing
Direct Drive
•
Protection degree
IP44
•
Isolation level
cl.F
•
Efficiency
IE5
•
Operating temperature MIN = -20°C - MAX = +40°C; up to
the limit of +50°C (derating from +40°C to +50°C)
Motor data for every type of machine is indicated further in this
manual.
If the air flow rate decreases, the heat output shall
automatically diminish.
Ventilation Operation
WINTER
During “Heating” operation (in winter), “MASTER” CPU PCB
regulates ventilation by modulating the rotation speed on the
basis of the heat output (parameter H16 = 2) and of the values
set in parameters H12 and H13:
H12 = Y2 output minimum voltage = 6 (Default)
H13 = Y2 output maximum voltage = 10 (Default)
If the operation required is not of modulating type, but with
constant air flow rate, parameters H12 and H13 must be equal
(equal to the desired ventilation value).
SUMMER
During “Ventilation” operation (in summer), ventilation is fixed
at constant speed, equal to the output of the voltage value set
in parameter H18:
H18 = Y2 output fixed voltage = 8 (Default).
Frame and body
The frame is made of Magnelis
®
sheet columns firmly linked to
the main panels (intake section, fan section and delivery section),
also made of Magnelis
®
, constituting the bearing structure. The
white pre-painted containment panelling finishes and completes
the machine externally.
Safety Devices and Controls
All AH air handling units are supplied with the following
thermostats:
-
STB
Manual reset safety thermostat, inside the air
flow, which switches off the burner immedi
-
ately if the temperature is too high;
-
NTC
Flue gas probe, modules and stops the
burner operation before the safety thermostat
activates;
-
FLUE GAS
thermostat
Manual reset flue gas thermostat for protecting
the PP individual or common flues.
