Technical data

Installation, user and maintenance manual – GAHP-A
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2.3 TECHNICAL MANUFACTURING CHARACTERISTICS
The appliance is supplied with the following technical manufacturing characteristics,
control and safety components:
Steel sealed circuit, treated on the outside with epoxy paint.•
Sealed combustion chamber suited for type C installation.•
Metal mesh irradiation burner equipped with ignition and ame detection man-•
aged by an electronic control unit.
Tube coil heat recovery (AISI 304L ).•
Air-based heat exchanger with single-position nned coil, manufactured in steel •
tubing and aluminium ns.
Titanium stainless steel tube bundle water exchanger, with external insulation.•
Automatic two-way microprocessor-controlled defrosting valve, allowing the •
nned coil to be defrosted.
Control and safety components
S61 controller with integrated microprocessor and LCD display and control knob, •
complete with "Mod10" supplementary combustion modulation controller (see
Figure 5.1 Electronic board S61 → 39 and Figure 5.2 Mod10 controller → 41).
Plant water owmeter.•
Sealed circuit high temperature limit thermostat, manual reset.•
Flue temperature limit switch, automatic reset.•
Flue temperature thermostat 120 °C, manual reset.•
Sealed circuit safety relief valve.•
Safety by-pass valve, between high and low pressure sealed circuit.•
Antifreeze function for hydronic system.•
Ionization ame control box.•
Double shutter electric gas valve.•
Condensate siphon icing sensor.•
2.4 TECHNICAL DATA
Table 2.1 – GAHP-A LT technical data
GAHP-A LT GAHP-A LT S
OPERATION WHEN HEATING
OPERATING POINT A7W50
G.U.E. gas usage eciency % 151 (1)
Thermal power kW 34,9 (1)
OPERATING POINT A7W35
G.U.E. gas usage eciency % 165
Thermal power kW 38,4
Thermal capacity
Nominal (1013 mbar - 15°C) kW 25,7
true peak kW 25,2
NOx emission class 5
NOx emission ppm 25
CO emission ppm 36
Hot water delivery temperature
maximum for heating °C 55
maximum for ACS °C 70
Hot water return temperature
maximum heating °C 45
maximum for ACS °C 60
minimum °C 2
Hot water ow rate
nominal l/h 3000
maximum l/h 4000
minimum l/h 1000
Hot water pressure drop
nominal water pressure
(A7W50)
bar 0,43 (2)
Ambient air temperature (dry bulb)
maximum °C 45
minimum °C -20 (7)
Thermal dierential nominal °C 10