Robur GAHP A indoor Service manual

GAHP A
Installation, use and maintenance manual
powered by gas and renewable energies
Air-Water gas absorption heat pump

Revision: AA
Code: D-LBR548
This Installation, use and maintenance manual has been drawn up and printed by Robur S.p.A.; whole or partial
reproduction of this Installation, use and maintenance manual is prohibited.
The original is led at Robur S.p.A.
Any use of this Installation, use and maintenance manual other than for personal consultation must be previously
authorised by Robur S.p.A.
The rights of those who have legitimately led the registered trademarks contained within this publication are not
aected.
With the aim of continuously improving the quality of its products, Robur S.p.A. reserves the right to modify the
data and contents of this Installation, use and maintenance manual without prior notice.
DISPOSAL
The appliance and all its accessories must be disposed of separately in accordance with the regulations in force.
Use of the WEEE symbol (Waste Electrical and Electronic Equipment) indicates that this product cannot be disposed of as household waste.
Proper disposal of this product helps to prevent potential negative consequences for the environment and human health.

Installation, use and maintenance manual – GAHP A 3
I Introduction............................................................................. p.4
I.1 Recipients .......................................................................... p.4
I.2 Control device.................................................................. p.4
II Symbols and denitions............................................... p.4
II.1 Key to symbols................................................................. p.4
II.2 Terms and denitions.................................................... p.4
III Warnings...................................................................................... p.4
III.1 General and safety warnings...................................... p.4
III.2 Compliance....................................................................... p.6
III.3 Exclusions of liability and warranty.......................... p.6
1 Features and technical data...................................... p.7
1.1 Features.............................................................................. p.7
1.2 Dimensions ....................................................................... p.7
1.3 Components..................................................................... p.9
1.4 Electrical wiring diagram ........................................... p.12
1.5 Electronic boards .......................................................... p.13
1.6 Operation mode............................................................ p.16
1.7 Controls ............................................................................ p.16
1.8 Technical data ................................................................ p.16
2 Transport and positioning........................................ p.18
2.1 Warnings.......................................................................... p.18
2.2 Handling........................................................................... p.18
2.3 Appliance positioning................................................. p.18
2.4 Minimum clearance distances.................................. p.19
2.5 Mounting base............................................................... p.19
3 Heating engineer............................................................... p.19
3.1 Warnings.......................................................................... p.19
3.2 Hydraulic system........................................................... p.20
3.3 Hydraulic connections ................................................ p.20
3.4 Water pump.................................................................... p.20
3.5 Antifreeze function....................................................... p.20
3.6 Antifreeze liquid............................................................ p.21
3.7 System water quality ................................................... p.21
3.8 System lling .................................................................. p.22
3.9 Fuel gas supply .............................................................. p.22
3.10 Combustion products exhaust ................................ p.23
3.11 Flue gas condensate drain......................................... p.23
3.12 Defrosting water drainage......................................... p.24
4 Electrical installer.............................................................. p.24
4.1 Warnings.......................................................................... p.24
4.2 Electrical systems.......................................................... p.24
4.3 Electrical power supply............................................... p.25
4.4 Adjustment and control ............................................. p.25
4.5 Water pump.................................................................... p.28
5 First start-up .......................................................................... p.29
5.1 Preliminary checks........................................................ p.29
5.2 Electronic adjustment on the machine – Menus
and parameters of the S61 board........................... p.30
5.3 Modifying settings........................................................ p.31
6 Normal operation.............................................................. p.31
6.1 Warnings.......................................................................... p.31
6.2 Switch on and o.......................................................... p.31
6.3 Modifying settings........................................................ p.31
6.4 Eciency.......................................................................... p.32
7 Maintenance.......................................................................... p.32
7.1 Warnings.......................................................................... p.32
7.2 Pre-emptive maintenance......................................... p.32
7.3 Scheduled routine maintenance............................. p.32
7.4 Messages on the display ............................................ p.33
7.5 Restarting a locked-out unit..................................... p.33
7.6 Periods of inactivity...................................................... p.33
8 Diagnostics.............................................................................. p.34
8.1 Operative codes............................................................. p.34
9 Appendices.............................................................................. p.37
9.1 Product che................................................................... p.37
INDEX OF CONTENTS

Introduction
4
I
I INTRODUCTION
Installation, use and maintenance manual
This Manual is an integral part of the GAHP A appliance
and must be handed to the end user together with the
appliance.
I.1 RECIPIENTS
This Manual is intended for:
▶ End user, for appropriate and safe use of the appliance.
▶ Qualied installer, for correct appliance installation.
▶ Planner, for specic information on the appliance.
I.2 CONTROL DEVICE
In order to be able to work, the GAHP A unit needs a control
device (DDC, CCP/CCI or external requests), which must be con-
nected by the installer.
II SYMBOLS AND DEFINITIONS
II.1 KEY TO SYMBOLS
DANGER
WARNING
NOTE
PROCEDURE
REFERENCE (to other document)
II.2 TERMS AND DEFINITIONS
GAHP appliance/unit = equivalent terms, both used to des-
ignate the GAHP gas powered absorption heat pump (Gas
Absorption Heat Pump).
TAC = Technical Assistance Centre authorised by Robur.
External request = generic control device (e.g. thermostat, tim-
er or any other system) equipped with a voltage-free NO contact
and used as control to start/stop the GAHP unit.
CCI Controller (Comfort Controller Interface) = optional Robur
control device which lets you manage up to three consistent
modulating GAHP units (GAHP A, GAHP GS/WS) only for heating.
CCP Controller (Comfort Control Panel) = Robur control device
which lets you manage in modulation mode up to 3 consistent
GAHP units (GAHP A, GAHP GS/WS) and all system components
(probes, diverter/mixing valves, circulating pumps), including
any integration boiler.
DDC Control (Direct Digital Controller) = optional Robur con-
trol device to manage one or more Robur appliances in ON/OFF
mode (GAHP heat pumps, GA chillers) or in modulating mode
(AY boilers).
RB100/RB200 Devices (Robur Box) = optional interface devices
complementary to DDC, which may be used to broaden its func-
tions (heating/cooling/DHW production service demands and
control of system components such as third party generators,
adjustment valves, circulators, probes).
Heat generator = equipment (e.g. boiler, heat pump, etc..) pro-
ducing heating and/or DHW.
GUE (Gas Utilization Eciency) = eciency index of gas heat
pumps, equal to the ratio between the thermal energy pro-
duced and the energy of the fuel used (relative to LCV, lower
caloric value).
First start-up = appliance commissioning operation which may
only and exclusively be carried out by a TAC.
S61/Mod10/W10 Boards = electronic boards on the GAHP unit,
to control all functions and to provide interface with other devic-
es and with the user.
III WARNINGS
III.1 GENERAL AND SAFETY WARNINGS
Installer's qualications
Installation must exclusively be performed by a qualied
rm and by qualied personnel, with specic knowledge
on heating, cooling, electrical systems and gas applianc-
es, in compliance with the laws in force in the Country of
installation.
Declaration of conformity
Upon completing installation, the installing rm shall
issue to the owner/client the appliance's workmanlike
conformity declaration, according to national/local reg-
ulations in force and the manufacturer's instructions/
provisions.
Misuse
The appliance must only be used for the purposes for
which it has been designed. Any other use is deemed
hazardous. Incorrect use may aect operation, duration
and safety of the appliance. Adhere to the manufactur-
er's instructions.
Use of the appliance by children
The appliance can be used by children over 8 years old,
and by people with reduced physical, sensory or men-
tal capabilities, or lack of experience or knowledge,
only if they are under surveillance or after they have re-
ceived instructions regarding safe use of the appliance

Warnings
Installation, use and maintenance manual – GAHP A 5
III
and understanding the dangers inherent in it. Children
should not play with the appliance.
Hazardous situations
Do not start the appliance in hazardous conditions, such
as: gas smell, problems with the plumbing/electrical/gas
system, parts of the appliance under water or damaged,
malfunctioning, disabling or bypassing control and safe-
ty devices.
In case of danger, request intervention by qualied per-
sonnel.
In case of danger, switch o the electrical power and gas
supplies only if this can be done in total safety.
Gas component tightness
Before performing any operation on gas ducting compo-
nents, close the gas valve.
Upon completing any procedure, perform the tightness
test according to regulations in force.
Gas smell
If you smell gas:
Do not use electrical devices such as telephones, mul-
timeters or other equipment that may cause sparks next
to the appliance.
Shut o the gas supply by turning the valve o.
Switch o the power supply via the external disconnect
switch in the power supply electrical panel.
Use a telephone away from the appliance to ask for inter-
vention from qualied personnel.
Poisoning
Ensure the ue gas ducts are tight and compliant with
the regulations in force.
Upon completing any procedure, ensure the tightness of
the components.
Moving parts
The appliance contains moving parts.
Do not remove guards during operation, and in any case
prior to disconnecting the power supply.
Burn hazard
The appliance contains very hot parts.
Do not open the appliance and do not touch internal
components before the appliance has cooled down.
Do not touch the ue gas exhaust before it has cooled
down.
Pressure vessels
The appliance has a sealed circuit classied as pres-
sure vessel, the tightness of which is tested by the
manufacturer.
Do not carry out any intervention on the sealed circuit or
on the appliance's valves.
Water-ammonia solution
The GAHP unit uses the ammonia-water absorption
cycle. The water-ammonia solution is contained in the
sealed circuit. The solution is harmful for health if it is
ingested, inhaled or comes in contact with the skin.
In the event of coolant leak keep away and disconnect
the power and gas supply (only if it is possible to do so
with no danger).
Ask for TAC intervention.
Electrocution hazard
Disconnect the electrical power supply before any oper-
ation on appliance components.
For electrical connections exclusively use compliant
components and according to the specications provid-
ed by the manufacturer.
Ensure the appliance cannot be accidentally switched
back on.
Earthing
Electrical safety depends on eective earthing system,
correctly connected to the appliance and installed ac-
cording to the regulations in force.
Distance from combustible or ammable materials
Do not deposit ammable materials (paper, diluents,
paints, etc.) near the appliance.
Limescale and corrosion
Depending on the chemical/physical properties of the
system water, limescale or corrosion may damage the
appliance (Paragraph 3.7 p.21 ).
Check system sealing.
Avoid frequent top-ups.
Chloride concentration
The concentration of chlorides or free chlorine in the
system water must not exceed the values in Table
3.2 p.21 .
Aggressive substances in the air
Halogenated hydrocarbons containing chlorine and u-
orine compounds cause corrosion.The air of the installa-
tion site must be free from aggressive substances.
Acid ue gas condensate
Discharge the acid condensate of combustion ue gas in
compliance with current exhaust regulations.
Switching the appliance o
Disconnecting the power supply while the appliance
is running may cause permanent damage to internal
components.
Except in the case of danger, do not disconnect the pow-
er supply to switch o the appliance, but always and ex-
clusively act through the provided control device (DDC,
CCP/CCI or external request).
In the event of failure
Operations on internal components and repairs may
exclusively be carried out by a TAC, using only original
spare parts.
In the event of failure of the appliance and/or breakage

Warnings
6
III
of any component, do not attempt to repair and/or re-
store and immediately contact the TAC.
Routine maintenance
Proper maintenance assures the eciency and good op-
eration of the appliance over time.
Maintenance must be performed according to the man-
ufacturer's instructions (see Chapter 7 p. 32 ) and in
compliance with current regulations.
Appliance maintenance and repairs may only be entrust-
ed to rms legally authorised to work on gas appliances
and systems.
Enter into a maintenance contract with an authorised
specialised rm for routine maintenance and for servic-
ing in case of need.
Use only original parts.
Decommissioning and disposal
If the appliance is to be disposed of, contact the manu-
facturer for its disposal.
Keep the Manual
This Installation, use and maintenance manual must al-
ways accompany the appliance and must be handed to
the new owner or installer in the event of sale or removal.
III.2 COMPLIANCE
EU directives and standards
The absorption heat pumps of the GAHP series are certied as
conforming to standard EN 12309 and comply with the essential
requirements of the following Directives:
▶ 2016/426/EU "Gas Appliances Regulation" as amended and
added.
▶ 2014/30/EC "Electromagnetic Compatibility Directive" as
amended and added.
▶ 2014/35/EC "LowVoltage Directive" as amended and added.
▶ 2006/42/EC "Machine Directive" as amended and added.
▶ 2014/68/EU "Pressure Equipment Directive" as amended
and added.
▶ 811/2013/EU "Energy-Related Products regulation" as
amended and added.
▶ 813/2013/EU "Ecodesign requirements regulation" as
amended and added.
Furthermore, they comply with the requirements of the follow-
ing standards:
▶ EN 378 Refrigerating systems and heat pumps.
Other applicable provisions and standards
The design, installation, operation and maintenance of the sys-
tems shall be carried out in compliance with current applicable
regulations, depending on the Country and location, and in ac-
cordance with the manufacturer's instructions. In particular, reg-
ulations regarding the following shall be complied with:
▶ Gas systems and equipment.
▶ Electrical systems and equipment.
▶ Heating and cooling systems, and heat pumps.
▶ Environmental protection and combustion products ex-
haust.
▶ Fire safety and prevention.
▶ Any other applicable law, standard and regulation.
III.3 EXCLUSIONS OF LIABILITY AND
WARRANTY
Any contractual or extra-contractual liability of the man-
ufacturer for any damage caused by incorrect installa-
tion and/or improper use and/or failure to comply with
regulations and with the manufacturer's directions/in-
structions shall be disclaimed.
In particular, the warranty on the appliance may be ren-
dered void by the following conditions:
Incorrect installation.
Misuse.
Failure to comply with the manufacturer's indications on
installation, use and maintenance.
Alteration or modication of the product or any part
thereof.
Extreme operational conditions or however outside of
the operational ranges set forth by the manufacturer.
Damages caused by external agents such as salts, chlo-
rine, sulphur or other chemical substances contained in
the installation water or present in the air of the instal-
lation site.
Abnormal actions transmitted to the appliance by the
system or installation (mechanical stresses, pressure, vi-
brations, thermal expansion, electrical surges...).
Accidental damages or due to force majeure.

Features and technical data
Installation, use and maintenance manual – GAHP A 7
1
1 FEATURES AND TECHNICAL DATA
1.1 FEATURES
1.1.1 Operation
Based on the thermodynamic water-ammonia absorption cycle
(H20–NH3), the appliance produces hot water using outdoor air
as a renewable energy source (cold source) and natural gas (or
LPG) as primary energy.
The thermodynamic cycle takes place within a hermetically
sealed circuit, in welded construction, perfectly tight, facto-
ry-tested, which does not require any maintenance or coolant
top-ups.
1.1.2 Mechanical and thermo-hydraulic components
▶ Steel sealed circuit, externally treated with epoxy paint.
▶ Sealed combustion chamber (type C) suitable for outdoor
installations.
▶ Metal mesh radiant burner, equipped with ignition elec-
trodes and ame detection, managed by an electronic ame
control box.
▶ Titanium stainless steel shell-and-tube water heat exchang-
er, externally insulated.
▶ Stainless steel, shell-and-tube recovery exchanger of ue gas
latent heat.
▶ Air exchanger with nned coil, with steel pipe and alumin-
ium ns.
▶ Automatic microprocessor-controlled nned coil defrosting
valve.
▶ Low power consumption refrigerant uid oil pump.
▶ Standard or S1 silenced fan (reduction of electrical con-
sumption and reduction of sound emission).
1.1.3 Control and safety devices
▶ S61 electronic board with microprocessor, LCD display and
knob.
▶ Mod10 additional electronic board (integrated in S61).
▶ Auxiliary W10 electronic board.
▶ System water owmeter.
▶ Generator limit thermostat, with manual reset.
▶ Flue gas thermostat, with manual reset.
▶ Generator ns temperature probe.
▶ Sealed circuit safety relief valve.
▶ Bypass valve, between high and low-pressure circuits.
▶ Ionization ame control box.
▶ Double shutter electric gas valve.
▶ Antifreeze function for hydraulic system.
▶ Condensate drain obstruction sensor.
1.1.4 Standard or silenced fan
According to the type of fan the GAHP A unit is available in two
versions:
▶ Standard fan, for applications that do not require a special
degree of noiselessness.
▶ Silenced fan, for applications that require a high degree of
noiselessness.
1.2 DIMENSIONS
Figure1.1Service plate - Hydraulic/gas connections detail
G Gas connection Ø 3/4" F
B Water inlet connection Ø 1 1/4" F
A Water outlet connection Ø 1 1/4" F

Features and technical data
8
1
Figure1.2Dimensions (standard fan)
Figure1.3Dimensions (low consumption silenced fan)

Features and technical data
Installation, use and maintenance manual – GAHP A 9
1
1.3 COMPONENTS
Figure1.4Internal components - front view
1 Fan
2 Tapping point for ue analisys
3 Gas valve
4 Combustion air intake
5 Combustion blower
6 Ignition transformer
7 Tmix air-gas mixture temperature probe
8 Oil pump
9 Water inlet connection Ø 1 1/4" F
10 Water outlet connection Ø 1 1/4" F
11 Gas connection Ø 3/4" F
12 TA outdoor temperature probe
1
2
4
5
6
7
3
10
12
11
8
9

Features and technical data
10
1
Figure1.5Internal components - left side view
1 Manual reset of the ue exhaust thermostat
2 Sensing element of the ue exhaust thermostat
3 Ø 80mm ue gas exhaust
4 Generator n temperature sensor
5 Flame sensor / ignition electrodes
6 Condensate level sensor












Features and technical data
Installation, use and maintenance manual – GAHP A 11
1
Figure1.6Internal components - right side view
1 TG generator temperature probe
2 Safety valve
3 Delivery pipe owmeter
4 Flow temperature probe
5 Limit thermostat
6 Defrosting valve
7 Return temperature probe
8 Teva evaporator temperature probe












Features and technical data
12
1
1.4 ELECTRICAL WIRING DIAGRAM
Figure1.7Wiring diagram of the appliance with low consumption fan (S1)
SCH1 Controller S61
SCH2 W10 circuit board
SCH3 Mod10 circuit board
TER Power supply terminal block
CNTBOX Flame controller
PWRTR Board transformer
BLW Blower
PMP Oil pump
IGNTR Ignition transformer
IGN Ignition electrodes
FLS Flame sensor
LS Gas valve ON indicator lamp
GV Gas solenoid valve
TC Manual ue gas thermostat
TL Generator limit thermostat
FM Flowmeter
CWS Condensate water sensor
VD Defrosting valve
FAN Fan
CF Filter capacitor
THRC Hot water return temperature probe
THMC Hot water ow temperature probe
TMIX Combustion air temperature sensor
TA Ambient air temperature sensor
TG Generator temperature sensor
TF Fumes temperature sensor or generator n
sensor
TEVA Evaporator outlet temperature sensor
MA Terminal block
REED Oil pump rotation sensor

Features and technical data
Installation, use and maintenance manual – GAHP A 13
1
Figure1.8Wiring diagram of the appliance with standard fan
SCH1 Controller S61
SCH2 W10 circuit board
SCH3 Mod10 circuit board
TER Power supply terminal block
CNTBOX Flame controller
PWRTR Board transformer
BLW Blower
PMP Oil pump
IGNTR Ignition transformer
IGN Ignition electrodes
FLS Flame sensor
LS Gas valve ON indicator lamp
GV Gas solenoid valve
TC Manual ue gas thermostat
TL Generator limit thermostat
FM Flowmeter
CWS Condensate water sensor
VD Defrosting valve
FAN Fan
C Fan capacitor
(not in the low-noise unit)
THRC Hot water return temperature probe
THMC Hot water ow temperature probe
TMIX Combustion air temperature sensor
TA Ambient air temperature sensor
TG Generator temperature sensor
TF Fumes temperature sensor or generator n
sensor
TEVA Evaporator outlet temperature sensor
MA Terminal block
REED Oil pump rotation sensor
1.5 ELECTRONIC BOARDS
1.5.1 Electronic boards (S61+Mod10)
The unit's electrical board contains:
▶ Electronic board S61 (Figure 1.9 p. 14 ), with micropro-
cessor, it controls the appliance and displays data, messages
and operative codes. The appliance is monitored and pro-
grammed by interacting with the display and the knob.
▶ Auxiliary Mod10 electronic board (Figure 1.10 p. 15 ),
overlapping S61, it handles power modulation of the burner,
fan and water circulation pump.
▶ Satellite W10 electronic board (Figure 1.11 p. 15 ), inter-
connected to the S61 board and located next to it, used to
control defrosting operations of the GAHP unit.

Features and technical data
14
1
Figure1.9Electronic board S61
SCH1 Controller S61
SCH3 Mod10 electronic board (see specic gure
for further details)
A1, A2 Auxiliary inputs
ENC Knob
F1 T 2A fuse
F2 T 10A fuse
F3 T 2A fuse
F4 T 3,15A fuse
FAN (BK, WH, BR) Fan output
FS5 (24V AC) board supply 24-0-24 Vac
IGN.BOX (L, N) Flame controller power supply
230 Vac
J1 CAN bus Jumper
J10 Jumper N.O. contact
J82 W10 board connector (on Mod10)
JP10 6-pole ame controller connector
JP12 Flue gas probe or generator n probe input
JTAG S61 board programming connector
MAIN 230V (L, N) S61 board supply input 230Vac
N.O. CONTACT Normally open pump contact
P7 (R, W, Y, O) Enable input
P8 (GND, L, H) CAN bus connector
PUMP 230V (L, N) Oil pump supply output
SPI Communication port with Mod10
controller
SRT1 Oil pump rotation sensor input
SRT2 Hot water owmeter input
TA Ambient air temperature probe input
TA1 Evaporator output probe input
TA2 Not used
TCN Combustion air temperature probe input
TF Flue gas thermostat input

Features and technical data
Installation, use and maintenance manual – GAHP A 15
1
Figure1.10Mod10 controller
HFLOW Not used
CFLOW Condensation water sensor control
J51 S61 connector
HPMP Primary circuit hot water pump control
output (0-10 V)
CPMP S1 low consumption fan control output
(0-10 V)
NC1-C1 Status indication of locking warnig/error
CN5 Blower control
J82 W10 auxiliary controller connector
J83 W10 cable shielding connection
CN1 Inputs 0-10V (not used)
1235 4
Figure1.11W10 electronic board
FS1 Defrosting valve contact
JP1 Communication with S61/Mod10

Features and technical data
16
1
1.6 OPERATION MODE
1.6.1 ON/OFF or modulating operation
The GAHP A unit may operate in two modes:
1. ON/OFF, i.e. on (at full power) or o, with water pump at con-
stant or variable ow.
2. MODULATING, i.e. at variable load from 50% to 100% of heat-
ing capacity, with water pump at variable ow.
For each mode, specic control systems and devices are provid-
ed (Paragraph 1.7 p.16 ).
1.7 CONTROLS
1.7.1 Control device
The appliance may only work if it is connected to a control de-
vice, selected from:
1. DDC control
2. CCP/CCI controller
3. external request
1.7.2 Control system (1) with DDC (GAHP unit ON/
OFF)
The DDC controller is able to control appliances, a single GAHP
unit, or even several Robur GAHP/GA/AY units in cascade, only
in ON/OFF mode (non modulating). For more details refer to the
DDC, RB100, RB200 Manuals and the Design Manual.
1.7.3 DDC Controller
The main functions are:
▶ Adjustment and control of one (or more) Robur units of the
absorption line (GAHP, GA, AY).
▶ Data display and parameters setting.
▶ Time programming.
▶ Climatic curve control.
▶ Diagnostics.
▶ Errors reset.
▶ Possibility to interface with a BMS.
DDC functionality may be extended with auxiliary Robur devices
RB100 and RB200 (e.g. service requests, DHW production, third
party generator control, probe control, system valves or circulat-
ing pumps, ...).
1.7.4 Control system (2) with CCP/CCI (modulating
GAHP unit)
The CCP/CCI control is able to control up to 3 GAHP units in mod-
ulating mode (therefore GAHP A/GAHP GS/WS), plus any inte-
gration ON/OFF boiler. For further details and diagrams refer to
the CCP/CCI Manual and the design manual.
1.7.5 CCP/CCI Control
See CCP/CCI device Manual.
1.7.6 Control system (3) with external request (GAHP
unit ON/OFF)
The appliance may also be controlled via generic request de-
vices (e.g. thermostat, timer, switch, contactor...) tted with
voltage-free NO contact. This system only provides elementary
control (on/o, with xed set-point temperature), hence without
the important functions of systems (1) and (2). It is advisable to
possibly limit its use to simple applications only and with a sin-
gle appliance.
For connection of the selected device to the appliance's
electronic board please refer to Paragraph 4.4 p.25 .
1.8 TECHNICAL DATA
Table1.1GAHP A HT technical data
GAHP A HT Standard GAHP A HT S1
Heating mode
Seasonal space heating energy eciency class
(ErP)
medium-temperature application (55 °C) - A+
low-temperature application (35 °C) - A+
Heat output for each unit Outdoor temperature/Water outlet
temperature
A7W35 kW 41,3
A7W50 kW 38,3
A7W65 kW 31,1
A-7W50 kW 32,0
GUE eciency Outdoor temperature/Water outlet
temperature
A7W35 % 164
A7W50 % 152
A7W65 % 124
A-7W50 % 127
Heat input nominal (1013 mbar - 15 °C) (1) kW 25,7
real kW 25,2
Hot water outlet temperature maximum for heating °C 65
maximum for DHW °C 70
(1) Relative to NCV (net caloric value).
(2) In transient operation, lower temperatures are allowed.
(3) For ows other than nominal see Design Manual, Pressure losses Paragraph.
(4) As an option, a version for operation down to -30 °C is available.
(5) ±10% depending on power voltage and absorption tolerance of electric motors.
(6) PCI (G20) 34,02 MJ/m³ (15 °C - 1013 mbar).
(7) PCI (G25) 29,25 MJ/m³ (15 °C - 1013 mbar).
(8) PCI (G27) 27,89 MJ/m³ (15 °C - 1013 mbar).
(9) PCI (G30/G31) 46,34 MJ/kg (15 °C - 1013 mbar).
(10) Sound power values detected in compliance with the intensity measurement methodology set forth by standard EN ISO 9614. Data referred to 50 °C outlet temperature.
(11) Maximum sound pressure levels in free eld, with directionality factor 2, obtained from the sound power level in compliance with standard EN ISO 9614. Data referred to 50 °C outlet
temperature.
(12) Overall dimensions excluding ue gas exhaust.

Features and technical data
Installation, use and maintenance manual – GAHP A 17
1
GAHP A HT Standard GAHP A HT S1
Hot water inlet temperature
maximum for heating °C 55
maximum for DHW °C 60
minimum temperature in continuous operation °C 30 (2)
Heating water ow
nominal l/h 2500
maximum l/h 4000
minimum l/h 1400
Pressure drop heating mode at nominal water ow (A7W50) bar 0,31 (3)
Outdoor temperature (dry bulb) maximum °C 45
minimum °C -15 (4)
Electrical specications
Power supply
voltage V 230
type - single-phase
frequency Hz 50
Electrical power absorption nominal kW 0,84 (5) 0,77 (5)
minimum kW - 0,50 (5)
Degree of protection IP - X5D
Installation data
Gas consumption
G20 natural gas (nominal) m³/h 2,72 (6)
G20 natural gas (min) m³/h 1,34
G25 (nominal) m³/h 3,16 (7)
G25 (min) m³/h 1,57
G27 (nominal) m³/h 3,32 (8)
G27 (min) m³/h 1,62
G30 (nominal) kg/h 2,03 (9)
G30 (min) kg/h 0,99
G31 (nominal) kg/h 2,00 (9)
G31 (min) kg/h 0,98
NOxemission class - 5
NOxemission ppm 25,0
CO emission ppm 36,0
sound power Lw(max) dB(A) 79,6 (10) 74,0 (10)
sound power Lw(min) dB(A) - 71,0 (10)
sound pressure Lpat 5 metres (max) dB(A) 57,6 (11) 52,0 (11)
sound pressure Lpat 5 metres (min) dB(A) - 49,0 (11)
minimum storage temperature °C -30
maximum water pressure in operation bar 4,0
maximum ow rate of ue gas condensate l/h 4,0
water content inside the appliance l 4
Water tting type - F
thread “ 1 1/4
Gas connection type - F
thread “ 3/4
Flue gas exhaust diameter (Ø) mm 80
residual head Pa 80
type of installation - B23P, B33, B53P
Dimensions
width mm 854 (12)
depth mm 1260
height mm 1445 (12) 1540
Weight in operation kg 390 400
required air ow m³/h 11000
fan residual head Pa - 40
General information
Refrigerating uid ammonia R717 kg 7,0
water H2O kg 10,0
maximum pressure of the refrigerating circuit bar 32
(1) Relative to NCV (net caloric value).
(2) In transient operation, lower temperatures are allowed.
(3) For ows other than nominal see Design Manual, Pressure losses Paragraph.
(4) As an option, a version for operation down to -30 °C is available.
(5) ±10% depending on power voltage and absorption tolerance of electric motors.
(6) PCI (G20) 34,02 MJ/m³ (15 °C - 1013 mbar).
(7) PCI (G25) 29,25 MJ/m³ (15 °C - 1013 mbar).
(8) PCI (G27) 27,89 MJ/m³ (15 °C - 1013 mbar).
(9) PCI (G30/G31) 46,34 MJ/kg (15 °C - 1013 mbar).
(10) Sound power values detected in compliance with the intensity measurement methodology set forth by standard EN ISO 9614. Data referred to 50 °C outlet temperature.
(11) Maximum sound pressure levels in free eld, with directionality factor 2, obtained from the sound power level in compliance with standard EN ISO 9614. Data referred to 50 °C outlet
temperature.
(12) Overall dimensions excluding ue gas exhaust.

Transport and positioning
18
2
Table1.2PED data
GAHP A HT Standard GAHP A HT S1
PED data
Components under pressure
generator l 18,6 18,6
leveling chamber l 11,5 11,5
evaporator l 3,7 3,7
refrigerant volume changer l 4,5 4,5
solution refrigerant absorber l 6,3 6,3
solution pump l 3,3 3,3
test pressure (in air) bar g 55 55
maximum pressure of the refrigerating circuit bar g 32 32
lling ratio kg of NH3/l 0,146 0,146
uid group - GROUP 1° GROUP 1°
2 TRANSPORT AND POSITIONING
2.1 WARNINGS
Damage from transport or installation
The manufacturer shall not be liable for any damage dur-
ing appliance transport and installation.
On-site inspection
Upon arrival at the site, ensure there is no transport dam-
age on packing, metal panels or nned coil.
After removing the packing materials, ensure the appli-
ance is intact and complete.
Packing
Only remove the packing after placing the appliance on
site.
Do not leave parts of the packing within the reach of
children (plastic, polystyrene, nails...) since they are po-
tentially dangerous.
Weight
The crane and lifting equipment must be suitable for the
load.
Do not stand under suspended loads.
2.2 HANDLING
2.2.1 Handling and lifting
▶ Always handle the appliance in its packing, as delivered by
the factory.
▶ To lift the appliance use straps or slings inserted in the holes
of the base (Figure 2.1 p.18 ).
▶ Use lifting beams to avoid damaging the outer panels and
nned coil (Figure 2.1 p.18 ).
▶ Comply with safety regulations at the installation site.
Figure2.1Instruction for lifting
In the event of handling with forklift or pallet truck,
comply with the handling instructions shown on the
packing.
2.3 APPLIANCE POSITIONING
Do not install inside a room
The appliance is type-approved for external installation.
Do not install inside a room, not even if it has openings.
In no event start the appliance inside a room.
GAHP A unit ventilation
The aerothermic appliance requires a large space, venti-
lated and free from obstacles, to enable smooth ow of
air to the nned coil and free air outlet above the mouth
of the fan, with no air recirculation.
Incorrect ventilation may aect eciency and cause
damage to the appliance.
The manufacturer shall not be liable for any incorrect
choices of the place and setting of installation.
2.3.1 Where to install the appliance
▶ The appliance may be installed at ground level, on a terrace

Heating engineer
Installation, use and maintenance manual – GAHP A 19
3
or on a roof, compatibly with its dimensions and weight.
▶ It must be installed outside buildings, in an area of natural air
circulation, outside the dripping path of drainpipes or simi-
lar. It does not require protection from weathering.
▶ No obstruction or overhanging structure (e.g. protruding
roofs, canopies, balconies, ledges, trees) shall interfere either
with the air owing from the top of the appliance or with the
exhaust ue gas.
▶ The appliance's ue gas exhaust must not be immediately
close to openings or air intakes of buildings, and must com-
ply with safety and environmental regulations.
▶ Do not install near the exhaust of ues, chimneys or hot
polluted air. In order to work correctly, the appliance needs
clean air.
2.3.2 Defrosting water drainage
In winter, it is normal for frost to form on the nned
coil and for the appliance to perform defrosting cy-
cles.
To prevent overowing and damage provide for a drain-
age system.
2.3.3 Acoustic issues
▶ Pre-emptively assess the appliance's sound eect in connec-
tion to the site, taking into account that building corners, en-
closed courtyards, restricted spaces may amplify the acous-
tic impact due to the reverberation phenomenon.
2.4 MINIMUM CLEARANCE DISTANCES
2.4.1 Distances from combustible or ammable
materials
Keep the appliance away from combustible or ammable mate-
rials or components, in compliance with applicable regulations.
2.4.2 Clearances around the appliance
The minimum clearance distances shown in Figure 2.2 p. 19
(bar any stricter regulations) are required for safety, operation
and maintenance.
Figure2.2Clearances
2.5 MOUNTING BASE
2.5.1 Mounting base constructive features
▶ Place the appliance on a level at surface made of reproof
material and able to withstand its weight.
2.5.2 (1) - installation at ground level
▶ Failing a horizontal supporting base, make a at and level
concrete base, at least 100-150 mm larger than the appli-
ance size per side.
2.5.3 (2) - installation on terrace or roof
▶ The structure of the building must support the total weight
of the appliance and the supporting base.
▶ If necessary, provide a maintenance walkway around the ap-
pliance.
2.5.4 Anti vibration mountings
Although the appliance's vibrations are minimal, resonance
phenomena might occur in roof or terrace installations.
▶ Use anti-vibration mountings.
▶ Also provide anti-vibration joints between the appliance
and water and gas pipes.
3 HEATING ENGINEER
3.1 WARNINGS
3.1.1 General warnings
Read the warnings in Chapter III.1 p. 4 , providing im-
portant information on regulations and on safety.
Compliance with installation standards
Installation must comply with applicable regulations in
force, based on the installation Country and site, in mat-
ters of safety, design, implementation and maintenance
of:
heating systems
cooling systems
gas systems
ue gas exhaust
ue gas condensate discharge
Installation must also comply with the manufacturer's
provisions.

Heating engineer
20
3
3.2 HYDRAULIC SYSTEM
3.2.1 Primary and secondary circuit
▶ In many cases it is advisable to divide the hydraulic system
into two parts, primary and secondary circuit, uncoupled by
a hydraulic separator, or possibly by a tank that also acts as
inertial tank/buer.
3.2.2 Constant ot variable water ow
The GAHP A unit may work with costant or variable water ow,
regardless of the ON/OFF or modulating operative mode.
System and components must be designed and installed
consistently.
3.2.3 Minimum water content
High thermal inertia is conducive to ecient appliance opera-
tion. Very short ON/OFF cycles are to be avoided.
▶ If necessary, provide for an inertial volume, to be suitably
sized (see design manual).
3.3 HYDRAULIC CONNECTIONS
3.3.1 Hydraulic connections
on the right, at the bottom, connection plate (Figure 1.1 p.7 ).
▶ A (= out) 1 1/4" F - WATER OUTLET (m = outlet to the system)
▶ B (= in) 1 1/4" F - WATER INLET (r = return from the system)
3.3.2 Hydraulic pipes, materials and features
▶ Use pipes for heating/cooling systems, protected from
weathering and freezing, insulated for thermal dispersion.
Pipe cleaning
Before connecting the appliance,accurately wash the
water and gas piping and any other system component,
removing any residue.
3.3.3 Minimum components of primary plumbing
circuit
Always provide, near the appliance:
▶ on water piping, both output and input
2 antivibration joints on water ttings
2 pressure gauges
2 isolation ball valves
▶ on the inlet water piping
1 separator lter
1 ow regulation valve, if the circulation pump is with
constant ow
1 water circulation pump, towards the appliance
▶ on the output water piping
1 safety valve (3 bar)
1 expansion tank of the individual unit
Figure3.1Hydraulic plan
The ow regulator valve must only be used when
the primary circuit circulation pump is constant
ow type
A Gas connection
1 Anti-vibration connection
2 Pressure gauge
3 Flow regulator valve
4 Water lter
5 Shut-o valves
6 Water pump (primary circuit)
7 Safety valve (3 bar)
8 Expansion tank
9 Hydraulic separator / inertial tank with 4 ttings
10 Water pump (secondary circuit)
3.4 WATER PUMP
The circulation pump (ow and head) must be selected and
installed based on pressure drops of plumbing/primary circuit
(piping + components + exchange terminals + appliance).
For the appliance pressure drops refer to Table 1.1 p. 16 and
Design Manual.
3.4.1 (1) Constant ow circulation pump
The primary circulation pump must be obligatorily controlled
by the appliance's electronic board (S61) (see Paragraph
1.5 p.13 ).
3.4.2 (2) Variable ow circulation pump
For variable ow operation, use of a Wilo Stratos Para pump is
obligatory, supplied as accessory on demand, to be connected
to the Mod10 electronic board (see Paragraph 1.5 p.13 ). Any
other type of pump will give constant ow.
Refer to the Design Manual for the features of the Wilo Stratos
Para pump.
3.5 ANTIFREEZE FUNCTION
3.5.1 Active antifreeze self-protection
The appliance is equipped with an active antifreeze self-pro-
tection system to prevent freezing. The antifreeze function