Robur GAHP-GS Service manual

Installation, use and maintenance manual
GAHP GS/WS
powered by gas and renewable energies
water/water gas absorption heat pump

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.
Revision: Y
Code: D-LBR509
DISPOSAL
The appliance and all its accessories must be disposed of separately in accordance with the regulations in force.
Use of theWEEE symbol (Waste Electrical and Electronic Equipment) indicates that this product cannot be disposed of as house-
hold waste. Proper disposal of this product helps to prevent potential negative consequences for the environment and human
health.

Installation, use and maintenance manual – GAHP GS/WS 3
TABLE OF CONTENTS
I Introduction.......................................................................... p.4
I.1 Recipients................................................................ p.4
I.2 Control device ....................................................... p.4
I.3 Available languages ............................................ 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.8
1.1 Features.................................................................... p.8
1.2 Dimensions............................................................. p.9
1.3 Electronic boards................................................ p.10
1.4 Operation mode ................................................. p.10
1.5 Controls.................................................................. p.10
1.6 Technical data...................................................... p.11
2 Transport and positioning.................................. p.13
2.1 Warnings................................................................ p.13
2.2 Handling and lifting .......................................... p.13
2.3 Appliance positioning (outdoor version)
................................................................................... p.14
2.4 Installation room (indoor version)................ p.14
2.5 Minimum clearance distances....................... p.14
2.6 Mounting base.................................................... p.14
3 Heating engineer........................................................... p.15
3.1 Warnings................................................................ p.15
3.2 Hydraulic system ................................................ p.15
3.3 Hydraulic connections...................................... p.15
3.4 Water circulation pumps.................................. p.17
3.5 Antifreeze function............................................ p.17
3.6 Antifreeze uid.................................................... p.17
3.7 System water quality......................................... p.17
3.8 System lling........................................................ p.18
3.9 Fuel gas supply.................................................... p.18
3.10 Combustion products exhaust...................... p.19
3.11 Flue gas condensate drain.............................. p.22
3.12 Safety valve drain (indoor version) .............. p.22
4 Electrical installer......................................................... p.23
4.1 Warnings................................................................ p.23
4.2 Electrical systems ............................................... p.23
4.3 Electrical power supply.................................... p.24
4.4 Adjustment and control................................... p.24
4.5 Water circulation pumps.................................. p.27
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.32
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.33
7.4 Messages on the display.................................. p.33
7.5 Restarting a locked-out unit........................... p.33
7.6 Periods of inactivity........................................... p.34
8 Diagnostics........................................................................... p.34
8.1 Operative codes.................................................. p.34
9 Appendices........................................................................... p.38
9.1 Product che........................................................ p.38

Introduction
4
I
I INTRODUCTION
Installation, use and maintenance manual
This Manual is an integral part of the GAHP GS/WS
units 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 work, the GAHP GS/WS appliance needs a con-
trol device (DDC, CCI or external request), which must be
connected by the installer.
I.3 AVAILABLE LANGUAGES
This document is originally written in Italian and English.
Any other languages are translations of this document.
For versions of this document in other languages, see
Robur website.
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
designate 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. thermo-
stat, timer or any other system) equipped with a volt-
age-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
modulating GAHP units (GAHP A, GAHP GS/WS) of the
same type, for heating only.
DDC Control (Direct Digital Controller) = optional Robur
control 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 functions (heating/cooling/DHW produc-
tion service demands and control of system components
such as third party generators, adjustment valves, water
pumps, probes).
GUE (Gas Utilization Eciency) = eciency index of gas
heat pumps, equal to the ratio between the thermal ener-
gy produced 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 inter-
face with other devices 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 spe-
cic knowledge on heating, cooling, electrical sys-
tems and gas appliances, 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 regulations in force and the manu-
facturer's instructions/provisions.
Misuse
The appliance must only be used for the purpos-
es for which it has been designed. Any other use is
deemed hazardous. Incorrect use may aect oper-
ation, duration and safety of the appliance. Adhere

Warnings
Installation, use and maintenance manual – GAHP GS/WS 5
III
to the manufacturer'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, senso-
ry or mental capabilities, or lack of experience or
knowledge, only if they are under surveillance or
after they have received instructions regarding
safe use of the appliance 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 safety devices.
In case of danger, request intervention by qualied
personnel.
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
components, 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,
multimeters 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 dis-
connect switch in the power supply electrical pan-
el.
Use a telephone away from the appliance to ask for
intervention 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 tight-
ness 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 inter-
nal 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 cir-
cuit or on the appliance's valves.
Water-ammonia solution
The GAHP appliance uses the ammonia-water ab-
sorption cycle.The water-ammonia solution is con-
tained in the sealed circuit. The solution is harmful
to health if ingested, inhaled or brought into con-
tact with the skin.
In the event of coolant leak keep away and discon-
nect 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
operation on appliance components.
For electrical connections exclusively use compli-
ant components and according to the specica-
tions provided by the manufacturer.
Ensure the appliance cannot be accidentally
switched back on.
Earthing
Electrical safety depends on eective earthing sys-
tem, correctly connected to the appliance and in-
stalled according to the regulations in force.
Distance from combustible or ammable mate-
rials
Do not deposit ammable materials (paper, dilu-
ents, paints, etc.) near the appliance.
Limescale and corrosion
Depending on the chemical/physical properties of
the system water, limescale or corrosion may dam-
age the appliance (Paragraph 3.7 p.17 ).
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 Ta-
ble 3.2 p.18 .

Warnings
6
III
Aggressive substances in the air
Halogenated hydrocarbons containing chlorine
and uorine compounds cause corrosion. The air
of the installation site must be free from aggressive
substances.
Acid ue gas condensate
Discharge the acid condensate of combustion ue
gasincompliancewithcurrentexhaustregulations.
Switching the appliance o
Disconnecting the power supply while the appli-
ance is running may cause permanent damage to
internal components.
Except in the case of danger, do not disconnect
the power supply to switch o the appliance, but
always and exclusively act through the provided
control device (DDC, 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 of any component, do not attempt to
repair and/or restore and immediately contact the
TAC.
Routine maintenance
Proper maintenance assures the eciency and
good operation of the appliance over time.
Maintenance must be performed according to the
manufacturer's instructions (see Chapter 7 p. 32 )
and in compliance with current regulations.
Appliance maintenance and repairs may only be
entrusted to rms legally authorised to work on
gas appliances and systems.
Enter into a maintenance contract with an author-
ised specialised rm for routine maintenance and
for servicing in case of need.
Use only original parts.
Decommissioning and disposal
If the appliance is to be disposed of, contact the
manufacturer for its disposal.
Keep the Manual
This Installation, use and maintenance manual
must always accompany the appliance and must
be handed to the new owner or installer in the
event of sale or removal.
III.2 COMPLIANCE
III.2.1 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 amend-
ed and added.
▶ 2014/30/EC "Electromagnetic Compatibility Directive"
as amended and added.
▶ 2014/35/EC "Low Voltage Directive" as amended and
added.
▶ 2014/68/EU "Pressure Equipment Directive" as amend-
ed 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
following standards:
▶ EN 378 Refrigerating systems and heat pumps.
III.2.2 Other applicable provisions and standards
The design, installation, operation and maintenance of
the systems shall be carried out in compliance with cur-
rent applicable regulations, depending on the Country
and location, and in accordance with the manufacturer's
instructions. In particular, regulations regarding the fol-
lowing shall be complied with:
▶ Gas systems and equipment.
▶ Electrical systems and equipment.
▶ Heating and cooling systems, and heat pumps.
▶ Environmental protection and combustion products
exhaust.
▶ 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
manufacturer for any damage caused by incorrect
installation and/or improper use and/or failure to
comply with regulations and with the manufactur-
er's directions/instructions shall be disclaimed.
In particular, the warranty on the appliance may be
rendered void by the following conditions:
Incorrect installation.
Misuse.
Failure to comply with the manufacturer's indica-
tions on installation, use and maintenance.
Alteration or modication of the product or any
part thereof.
Extreme operational conditions or however out-
side of the operational ranges set forth by the man-
ufacturer.

Warnings
Installation, use and maintenance manual – GAHP GS/WS 7
III
Damages caused by external agents such as salts,
chlorine, sulphur or other chemical substances
contained in the installation water or present in the
air of the installation site.
Abnormal actions transmitted to the appliance by
the system or installation (mechanical stresses,
pressure, vibrations, thermal expansion, electrical
surges...).
Accidental damages or due to force majeure.

Features and technical data
8
1
1 FEATURES ANDTECHNICAL DATA
1.1 FEATURES
1.1.1 Operation
Based on the thermodynamic water-ammonia absorption
cycle (H20–NH3), the appliance simultaneously produces
hot water and chilled water, using the ground or well/
ground/surface water as a renewable energy source (cold
source) and natural gas (or LPG) as primary energy.
The thermodynamic cycle takes place within a hermeti-
cally sealed circuit, in welded construction, perfectly tight,
factory-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 out-
door installations.
▶ Metal mesh radiant burner, equipped with ignition
electrodes and ame detection, managed by an elec-
tronic ame control box.
▶ Titanium stainless steel shell-and-tube water exchang-
er (condenser), externally insulated.
▶ Titanium stainless steel shell-and-tube water exchang-
er (evaporator), externally insulated.
▶ Low power consumption refrigerant uid oil pump.
▶ Stainless steel, shell-and-tube recovery exchanger of
ue gas latent heat.
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.
▶ Installation water ow meter (hot side).
▶ Installation water ow switch (cold side).
▶ 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.
▶ Condensate drain obstruction sensor.
1.1.4 Indoor or outdoor version
The GAHP GS/WS appliances are available in two versions,
indoor or outdoor, according to the installation site.

Features and technical data
Installation, use and maintenance manual – GAHP GS/WS 9
1
1.2 DIMENSIONS
Figure1.1Indoor GAHP GS/WS dimensions
A Flue gas outlet Ø 80 mm
B Combustion air intake Ø 80 mm
C Fumes thermostat manual reset
D Power supply cables input
E Ventilation fan
F Burner on warning light
G Gas connection Ø 3/4" F
H Hot water inlet Ø 1 1/4" F
L Renewable source water return Ø 1 1/4"
F
M Renewable source water delivery Ø 1
1/4" F
N Hot water outlet Ø 1 1/4" F
Q Safety valve drain ducting Ø 1 1/4"
R Centre distance of holes for vibration
damper supports
S Condensate drain connection
1278
848
916
695 (R)
95
212
332
432
935
690
896
1093
53
320
659
757
500
430
ABG
E
CF
Q
NM
LH
D
395 (R)
130
S
S

Features and technical data
10
1
Figure1.2Outdoor GAHP GS/WS dimensions
A Flue gas outlet Ø 80 mm
B Combustion air intake Ø 80 mm
C Fumes thermostat manual reset
D Power supply cables input
E Ventilation fan
F Appliance operation warning light
G Gas connection Ø 3/4" F
H Hot water inlet Ø 1 1/4" F
L Renewable source water return Ø 1 1/4" F
M Renewable source water delivery Ø 1
1/4" F
N Hot water outlet Ø 1 1/4" F
P Condensate drain connection
Q Centre distance of holes for vibration
damper supports
AB
G
CF
E
N M
L H
D
395 (Q)
130
690
935
212
332
432
695 (Q)
1056
95
1460
1278
848
1035
1139
896
1093
53
320
659
757
P
P
1.3 ELECTRONIC BOARDS
The unit's electrical board contains:
▶ Electronic board S61, with microprocessor, it con-
trols the appliance and displays data, messages and
operative codes. The appliance is monitored and
programmed by interacting with the display and the
knob.
▶ Auxiliary electronic board Mod10, overlaying the
S61, manages the power modulation of the burner
and of the water pump.
▶ Satellite electronic board W10, interconnected to
the S61 board and located to the side of it, is used to
control heating water pump.
1.4 OPERATION MODE
The GAHP GS/WS unit may operate in two modes:
1. ON/OFF, i.e. on (at full power) or o, with water pump
at constant ow.
2. MODULATING, i.e. at variable load from 50% to 100%
of heating capacity, with water pump at variable ow
(hot side) and at constant ow (cold side).
For each mode, specic control systems and devices are
provided (Paragraph 1.5 p.10 ).
1.5 CONTROLS
1.5.1 Control device
The appliance may only work if it is connected to a control
device, selected from:
1. DDC control
2. CCI control
3. external request
1.5.2 DDC Controller
The DDC control is able to manage one or more Robur ap-
pliances in ON/OFF mode (GAHP heat pumps, GA chillers)
or modulating mode (AY boilers).
The main functions are:
▶ Adjustment and control of one (or more) Robur units

Features and technical data
Installation, use and maintenance manual – GAHP GS/WS 11
1
of the absorption line (GAHP, GA, AY).
▶ Data display and parameters setting.
▶ Time programming.
▶ Heating 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 pro-
duction, third party generator control, probe control, sys-
tem valves or water pumps, ...).
For further details refer to the DDC, RB100, RB200
manuals and the design manual.
1.5.3 CCI control
The CCI control allows you to manage up to 3 GAHP units
in modulating mode (i.e. only GAHP A/GAHP GS/WS for
heating only).
The main functions are:
▶ Adjustment and modulation control of up to 3 GAHP
A/GAHP GS/WS units of the same type, for heating on-
ly.
▶ Data display and parameters setting.
▶ Manifold water temperature probe interface.
▶ Diagnostics.
▶ Errors reset.
▶ Possibility to interface with a BMS.
For further details refer to the CCI manual and the
design manual.
1.5.4 External request
The appliance may also be controlled with a generic re-
quest device (e.g. thermostat, timer, switch, contactor...)
tted with voltage-free NO contact. This system only
provides elementary control (on/o, with xed setpoint
temperature), thus without the important functions of
the DDC/CCI control. It is advisable to possibly limit its use
to simple applications only and with a single appliance.
There are two control options: either heating request or
cooling request.
For connection of the selected device to the appli-
ance's electronic board please refer to Paragraph
4.4 p.24 .
1.6 TECHNICAL DATA
Table1.1GAHP GS/WS technical data
GAHP GS HT GAHPWS
Heating operation
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 Evaporator inlet temperature/Deliv-
ery temperature
B0W35 kW 41,6 -
B0W50 kW 37,6 -
B0W65 kW 31,4 -
W10W35 kW - 43,9
W10W50 kW - 41,6
W10W65 kW - 35,8
GUE eciency Evaporator inlet temperature/Deliv-
ery temperature
B0W35 % 165 -
B0W50 % 149 -
B0W65 % 125 -
W10W35 % - 174
W10W50 % - 165
W10W65 % - 142
Heat input nominal (1013 mbar - 15 °C) kW 25,7
real kW 25,2
Hot water outlet temperature maximum for heating °C 65
maximum for DHW °C 70
Hot water inlet temperature
maximum for heating °C 55
maximum for DHW °C 60
minimum temperature in continuous operation °C 30 (1)
(1) In transient operation, lower temperatures are allowed.
(2) For ows other than nominal see Design Manual, Pressure losses Paragraph.
(3) Data referred to the indoor version. For the outdoor version, the minimum ambient air temperature is -15 °C. A special outdoor version is available as an option for
operation down to -30 °C.
(4) ±10% depending on power voltage and absorption tolerance of electric motors.
(5) Sound power values detected in compliance with the intensity measurement methodology set forth by standard EN ISO 9614; C type installation.
(6) Maximum sound pressure levels in free eld, with directivity factor 2, obtained from the sound power level in compliance with standard EN ISO 9614; C type
installation.
(7) Indoor version only.
(8) Width indoor version 916 mm. Overall dimensions excluding ue gas exhaust.
(9) Overall dimensions excluding ue gas exhaust.
(10) Tolerance ±5%.

Features and technical data
12
1
GAHP GS HT GAHPWS
Heating water ow
nominal l/h 3170 3570
maximum l/h 4000
minimum l/h 1400
Pressure drop heating mode at nominal water ow bar 0,49 (2) 0,57 (2)
Outdoor temperature (dry bulb) maximum °C 45
minimum °C 0 (3)
Renewable source operating conditions
Power recovered from renewable source Evaporator inlet temperature/Deliv-
ery temperature
B0W35 kW 16,4 -
B0W50 kW 12,1 -
B0W65 kW 7,0 -
W10W35 kW - 18,7
W10W50 kW - 16,6
W10W65 kW - 10,6
Renewable source water return temperature maximum °C 45
Renewable source delivery water temper-
ature minimum °C -5 3
Renewable source water ow (with 25%
glycol)
nominal (B0W50) l/h 3020 -
maximum l/h 4000 -
minimum l/h 2000 -
Renewable source water ow
nominal (W10W50) l/h - 2850
maximum l/h - 4700
minimum l/h - 2300
Renewable source pressure drop at nominal water ow bar 0,51 (2) 0,38 (2)
Electrical specications
Power supply
voltage V 230
type - single-phase
frequency Hz 50
Electrical power absorption nominal kW 0,41 (4)
Degree of protection IP - X5D
Installation data
Gas consumption
G20 natural gas (nominal) m³/h 2,72
G25 (nominal) m³/h 3,16
G25.1 (nominal) m³/h 3,16
G25.3 (nominal) m³/h 3,09
G27 (nominal) m³/h 3,32
G2.350 (nominal) m³/h 3,78
G30 (nominal) kg/h 2,03
G31 (nominal) kg/h 2,00
NOxemission class - 5
sound power Lw(max) dB(A) 66,1 (5)
sound pressure Lpat 5 metres (max) dB(A) 44,1 (6)
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 hot side l 4
cold side l 3
Water tting type - F
thread “ 1 1/4
Gas connection type - F
thread “ 3/4
safety valve drain ducting connection “ 1 1/4 (7)
Flue gas exhaust
diameter (Ø) mm 80
residual head Pa 80
product conguration - C63
(1) In transient operation, lower temperatures are allowed.
(2) For ows other than nominal see Design Manual, Pressure losses Paragraph.
(3) Data referred to the indoor version. For the outdoor version, the minimum ambient air temperature is -15 °C. A special outdoor version is available as an option for
operation down to -30 °C.
(4) ±10% depending on power voltage and absorption tolerance of electric motors.
(5) Sound power values detected in compliance with the intensity measurement methodology set forth by standard EN ISO 9614; C type installation.
(6) Maximum sound pressure levels in free eld, with directivity factor 2, obtained from the sound power level in compliance with standard EN ISO 9614; C type
installation.
(7) Indoor version only.
(8) Width indoor version 916 mm. Overall dimensions excluding ue gas exhaust.
(9) Overall dimensions excluding ue gas exhaust.
(10) Tolerance ±5%.

Transport and positioning
Installation, use and maintenance manual – GAHP GS/WS 13
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GAHP GS HT GAHPWS
type of installation -C13, C33, C43, C53, C63, C83, B23P,
B33
Dimensions
width mm 1056 (8)
depth mm 690
height mm 1278 (9)
Weight in operation kg 300
General information
Refrigerating uid (10) ammonia R717 kg 7,0 6,8
water H2O kg 10,0
maximum pressure of the refrigerating circuit bar 32
(1) In transient operation, lower temperatures are allowed.
(2) For ows other than nominal see Design Manual, Pressure losses Paragraph.
(3) Data referred to the indoor version. For the outdoor version, the minimum ambient air temperature is -15 °C. A special outdoor version is available as an option for
operation down to -30 °C.
(4) ±10% depending on power voltage and absorption tolerance of electric motors.
(5) Sound power values detected in compliance with the intensity measurement methodology set forth by standard EN ISO 9614; C type installation.
(6) Maximum sound pressure levels in free eld, with directivity factor 2, obtained from the sound power level in compliance with standard EN ISO 9614; C type
installation.
(7) Indoor version only.
(8) Width indoor version 916 mm. Overall dimensions excluding ue gas exhaust.
(9) Overall dimensions excluding ue gas exhaust.
(10) Tolerance ±5%.
Table1.2PED data
GAHP GS HT GAHPWS
PED data
Components under pressure
generator l 18,6
leveling chamber l 11,5
evaporator l 3,7
refrigerant volume changer l 4,5
absorber/condenser l 3,7
solution refrigerant absorber l 6,3
solution pump l 3,3
test pressure (in air) barg48,5
maximum pressure of the refrigerating circuit barg32
lling ratio kg of NH3/l 0,146 0,150
uid group - group 1°
2 TRANSPORT AND POSITIONING
2.1 WARNINGS
Damage from transport or installation
The manufacturer shall not be liable for any dam-
age during appliance transport and installation.
On-site inspection
Upon arrival at the site, ensure there is no transport
damage on packing or metal panels.
After removing the packing materials, ensure the
appliance is intact and complete.
Packing
Only remove the packing after placing the appli-
ance on site.
Do not leave parts of the packing within the reach
of children (plastic, polystyrene, nails...) since they
are potentially dangerous.
Weight
The crane and lifting equipment must be suitable
for the load.
Do not stand under suspended loads.
2.2 HANDLING AND LIFTING
▶ Always handle the appliance in its packing, as deliv-
ered by the factory.
▶ To lift the appliance use straps or slings inserted in the
holes of the base (Figure 2.1 p.14 ).
▶ Use lifting beams to avoid damaging the outer panels
(Figure 2.1 p.14 ).
▶ Comply with safety regulations at the installation site.

Transport and positioning
14
2
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 OUTDOOR
VERSION
Do not install the outdoor version inside a room,
not even if it has openings. In no event the outdoor
version may be started inside a room.
2.3.1 Where to install the appliance
In the outdoor version the appliance:
▶ May be only installed outside buildings, out of the
dripping line of rain gutters or the like. It does not re-
quire protection from weathering.
▶ The appliance may be installed at ground level, on a
terrace or on a roof, compatibly with its dimensions
and weight.
▶ The appliance's ue gas exhaust must not be immedi-
ately close to openings or air intakes of buildings, and
must comply with safety and environmental regula-
tions.
▶ Do not install near the exhaust of ues, chimneys or
hot polluted air. In order to work correctly, the appli-
ance needs clean air.
2.3.2 Acoustic issues
Pre-emptively assess the appliance's sound eect in
connection to the site, taking into account that build-
ing corners, enclosed courtyards, restricted spaces may
amplify the acoustic impact due to the reverberation
phenomenon.
2.4 INSTALLATION ROOM INDOOR
VERSION
The installation room must meet all requirements set
forth by laws, standards and regulations of the Country
and place of installation concerning gas appliances and
cooling appliances.
Do not install inside a room that has no aeration
openings.
Other appliances
Any other gas appliances in the room must neces-
sarily be type C.
2.4.1 Characteristics of the installation room
▶ The premise must be provided with permanent and
suciently wide ventilation openings to permit even
air ow for ventilation.
▶ Combustion air intake must be ducted from the out-
side (type C installation).
▶ The ue gas exhaust must be ducted to the outside.
The ue opening must not be immediately close to
openings or air intakes of buildings and must comply
with environmental and safety regulations.
2.5 MINIMUM CLEARANCE DISTANCES
The following specications apply to both outdoor and
indoor versions.
2.5.1 Distances from combustible or ammable
materials
Keep the appliance away from combustible or ammable
materials or components, in compliance with applicable
regulations.
2.5.2 Clearances around the appliance
The minimum clearance distances shown in Figure
2.2 p. 14 (bar any stricter regulations) are required for
safety, operation and maintenance.
Figure2.2Clearances
2.6 MOUNTING BASE
2.6.1 Base or oor construction features
Place the appliance on a level at surface made of re-
proof material and able to withstand its weight.
2.6.2 Installation at ground level
For outdoor version only:

Heating engineer
Installation, use and maintenance manual – GAHP GS/WS 15
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▶ Failing a horizontal supporting base, make a at and
level concrete base, at least 100-150 mm larger than
the appliance size per side.
2.6.3 Installation on terrace or roof
For outdoor version only:
▶ 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 appliance.
2.6.4 Anti vibration mountings
Although the appliance's vibrations are minimal, res-
onance phenomena might occur in roof or terrace
installations.
▶ Use anti-vibration mountings.
▶ Also provide anti-vibration joints between the appli-
ance and water and gas pipes.
3 HEATING ENGINEER
3.1 WARNINGS
Read the warnings in Chapter III.1 p. 4 , pro-
viding important information on regulations and
on safety.
Compliance with installation standards
Installation must comply with applicable regula-
tions in force, based on the installation Country
and site, in matters of safety, design, implementa-
tion and maintenance of:
heating systems
cooling systems
gas systems
ue gas exhaust
ue gas condensate drain
Installation must also comply with the manufactur-
er's provisions.
3.2 HYDRAULIC SYSTEM
3.2.1 Primary and secondary circuit
In many cases it is advisable to divide the water installa-
tion (hot side) into two parts, primary and secondary cir-
cuit, uncoupled by a hydraulic separator, or possibly by a
tank that also acts as inertial volume/thermal inertia.
3.2.2 Constant ot variable water ow
The GAHP GS/WS appliance is able to operate with con-
stant (always on the cooling side) or variable water ow
(only on the heating side) regardless of operation mode,
ON/OFF or modulating.
System and components must be designed and installed
consistently.
3.2.3 Minimum water content
High thermal inertia is conducive to ecient appliance
operation. Very short ON/OFF cycles are to be avoided.
▶ If necessary, provide for an inertial volume, to be suita-
bly sized (see design manual).
3.2.4 Heating and/or cooling
It may be required to alternatively or simultaneously pro-
duce hot water and/or chilled water. The selection of the
type of operation may be performed by the control de-
vice, by suitably selecting the priority (cooling or heating).
3.3 HYDRAULIC CONNECTIONS
3.3.1 Hydraulic connections
on the rear panel (Figures 1.1 p.9 and 1.2 p.10 ).
H. Hot water inlet Ø 1 1/4" F
L. Renewable source water return Ø 1 1/4" F
M. Renewable source water delivery Ø 1 1/4" F
N. Hot water outlet Ø 1 1/4" F
3.3.2 Hydraulic pipes, materials and features
Use pipes for heating/cooling installations, protected
from weathering, insulated for thermal losses, with va-
pour barrier to prevent condensation.
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 water
circuits
Always provide, near the appliance, both on the hot side
and cold side:
▶ on water piping, both outlet and inlet
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 outlet water piping (heating side only)
1 safety valve (3,5 bar)
1 expansion tank
For GAHP GS/WS with open circuit the EXCHANGER

Heating engineer
16
3
is obligatory.
Figure3.1GAHP GS plumbing diagram
The ow regulation valve must only be
used if the pump in the primary
circuit is the xed ow type
A Gas connection
B Safety valve drain ducting connection
(indoor version only)
C Heating circuit
D Secondary circuit management system
1 Anti-vibration connection
2 Pressure gauge
3 Flow regulation valve
4 Sludge lter
5 Shut-o valve
6 Primary circuit water pump on system
side
7 Primary circuit water pump on renewable
source side
8 Safety valve
9 Expansion tank
10 Buer tank (and hydraulic separator)
11 Heating/Cooling circuit water pump
12 Check valve
13 Geothermal eld probes
14 DDC panel
15 Outdoor temperature probe
P
P
P
P
T
B
11
10
1 3 52
A
4 6
8 9
7
13
14
15 12
D
14
CC
D
Figure3.2GAHP WS plumbing diagram
The ow regulation valve must only be
used if the pump in the primary
circuit is the xed ow type
A Gas connection
B Safety valve drain ducting connection
(indoor version only)
C Heating circuit
D Secondary circuit management system
1 Anti-vibration connection
2 Pressure gauge
3 Flow regulation valve
4 Sludge lter
5 Shut-o valve
6 Primary circuit water pump on system
side
7 Primary circuit water pump on renewable
source side
8 Safety valve
9 Expansion tank
10 Buer tank (and hydraulic separator)
11 Heating/Cooling circuit water pump
12 Check valve
13 Heat exchanger
14 Extraction well
15 Water return well
16 Submersible pump
17 DDC panel
18 Outdoor temperature probe
P
P
P
P
T
B
10
1 3 52
A
4 6
8 9
7
17
18
13
14
15
16
11
12
D
17
CC
D

Heating engineer
Installation, use and maintenance manual – GAHP GS/WS 17
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3.4 WATER CIRCULATION PUMPS
The appliance needs two water circulation pumps, one for
the hot side and one for the cold side.
The circulation pumps (ow and head) must be selected
and installed based on pressure drops of water/primary
circuit (piping + components + exchange terminals +
appliance).
For the appliance pressure drops refer to Table 1.1 p.11
and Design Manual.
3.4.1 Constant ow pumps
The heating-side and cooling-side primary circuit water
pumps must be controlled by the appliance's electronic
board (S61) (Paragraph 4.5.1 p.27 ).
3.4.2 Variable ow pumps
For variable ow operation, available only on the heating
side (the cooling side is always operated at constant ow),
it is mandatory to use the OPMP010 - F02 pump, supplied
as an optional, to be connected to the Mod10 electronic
board (Paragraph 4.5.2 p. 28 ). Any other type of pump
will give a constant ow.
Please refer to the design manual for the characteristics of
the OPMP010 - F02 pump.
3.5 ANTIFREEZE FUNCTION
The appliance is equipped with an active antifreeze
self-protection system to prevent freezing. The antifreeze
function (activated by default) automatically starts prima-
ry water pumps and, if required, the burner too, when the
outdoor temperature approaches zero.
Electrical and gas continuity
The active antifreeze self-protection is only eec-
tive if the power and gas supplies are assured. Oth-
erwise, antifreeze uid might be required.
3.6 ANTIFREEZE FLUID
Precautions with glycol
The manufacturer disclaims any liability for any
damage caused by improper glycol use.
Always check product suitability and its expiry
date with the glycol supplier. Periodically check the
product's preservation state.
Do not use car-grade antifreeze uid (without in-
hibitors), nor zinc-coated piping and ttings (in-
compatible with glycol).
Glycol modies the physical properties of water
(density, viscosity, specic heat...). Size the piping,
water pump and thermal generators accordingly.
With automatic system water lling, a periodic
check of the glycol content is required.
With high glycol percentage (> 20…30%)
If the glycol percentage is ≥30% (for ethylene gly-
col) or ≥20% (for propylene glycol) theTAC must be
alerted before rst start-up.
When producing DHW by DHW buer tank, use
propylene glycol only.
The use of toxic antifreeze uids is forbidden.
3.6.1 Hot side and cold side glycol
Assess the need to add glycol on the hot side. On the cold
side, glycol is recommended (in general) or indispensable
(with chilled water operating temperatures lower than
zero).
3.6.2 Type of antifreeze glycol
Inhibited type glycol is recommended to prevent oxida-
tion phenomena.
3.6.3 Glycol eects
The Table 3.1 p.17 shows, indicatively, the eects of us-
ing a glycol depending on its %.
Table3.1Glycol eects (GAHP/GA)
Glycol % Water-glycol mixture freezing
temperature Percentage of increase in pressure drops Loss of eciency of unit
10 -3 °C - -
15 -5 °C 6,0% 0,5%
20 -8 °C 8,0% 1,0%
25 -12 °C 10,0% 2,0%
30 -15 °C 12,0% 2,5%
35 -20 °C 14,0% 3,0%
40 -25 °C 16,0% 4,0%
3.7 SYSTEM WATER QUALITY
Responsibility of the user/operator/installer
The installer, operator and user must assure system
water quality (Table 3.2 p. 18 ). Failure to comply
with the manufacturer's guidelines may aect op-
eration, integrity and life of the appliance, voiding
the warranty.

Heating engineer
18
3
3.7.1 System water characteristics
In order to avoid any scale or deposits on the pri-
mary exchanger, the water in the system must be
treated in accordance with the applicable stand-
ards. This treatment is absolutely essential in cases
where there are frequent episodes of water supply
or partial or total emptying of the system.
The lling and top-up water bring some amount of cal-
cium into the system. This is attached to the hot parts in-
cluding the heat exchanger, thus creating pressure drops
and thermal insulation on the active parts. This can lead
to damage.
If the lling and top-up water of the system is outside the
values indicated below, it must be softened and/or chem-
ically treated. Additives may also be added to keep the
calcium in solution. Hardness should be checked regularly
and recorded on the system logbook.
The choice of the type of treatment must be made accord-
ing to the characteristics of the water to be treated, the
type of plant and the limits of purity required.
Free chlorine or water hardness may damage the
appliance.
Adhere to the chemical-physical parameters in Table
3.2 p. 18 and the regulations on water treatment for
residential and industrial heating systems.
Table3.2Chemical and physical parameters of water
Chemical and physical parameters of water in heating/cooling systems
Parameter Measurement unit Required value
pH / > 7 (1)
Chlorides mg/l < 125 (2)
Total hardness
(CaCO3)
°f < 15
°d < 8,4
Iron mg/kg < 0,5 (3)
Copper mg/kg < 0,1 (3)
Aluminium mg/l < 1
Langelier’s index / 0-0,4
Harmful substances
Free chlorine mg/l < 0,2 (3)
Fluorides mg/l < 1
Sulphides ABSENT
1 With aluminium or light alloys radiators, pH must also be lower than 8 (in
compliance with applicable rules)
2 Value referred to the maximum water temperature of 80 °C
3 In compliance with applicable rules
3.7.2 Choice of treatment
The characteristics of the system water must comply with
those detailed in Paragraph 3.7.1 p.18 .
The choice of a possible chemical conditioning system
or the addition of plant water additives is subject to the
designer, depending on the quality of water detected by
qualied personnel.
It must always be veried (through the technical oce of
the company producing the additive) that adding it to the
plant water does not cause any such alterations to come
out of the required parameters.
3.7.3 Water topping up
The chemical-physical properties of the system's water
may alter over time, resulting in poor operation or exces-
sive topping up.
▶ Ensure there are no leaks in the installation.
▶ Periodically check the chemical-physical parameters
of the water, particularly in case of automatic topping
up.
Chemical conditioning and washing
Water treatment/conditioning or system washing
carried out carelessly may result in risks for the ap-
pliance, the system, the environment and health.
Contact specialised rms or professionals for water
treatment or system washing.
Check compatibility of treatment or washing prod-
ucts with operating conditions.
Do not use aggressive substances for stainless steel
or copper.
Do not leave washing residues.
3.8 SYSTEM FILLING
How to ll up the system
After completing all water, electrical and gas
connections:
1. Pressurise (at least 1,5 bar) and vent the hydraulic
circuit.
2. Let water ow (with burner o) by activating the
service request and deactivating it before the
burner is ignited.
3. Check and clean the lter on the inlet pipe.
4. Repeat items 1, 2 and 3 until the pressure has stabi-
lised (at least 1,5 bar).
3.9 FUEL GAS SUPPLY
3.9.1 Gas connection
3/4" F on the left side, at the top, side panel (detail G Fig-
ures 1.1 p.9 1.2 p.10 ).
▶ Install an anti-vibration connection between the ap-
pliance and the gas piping.
3.9.2 Mandatory shut-o valve
▶ Provide a gas shut-o valve (manual) on the gas supply
line, next to the appliance, to isolate it when required.
▶ Perform connection in compliance with applicable
regulations.
3.9.3 Gas pipes sizing
The gas pipes must not cause excessive pressure drops
and, consequently, insucient gas pressure for the
appliance.
3.9.4 Supply gas pressure
This appliance is equipped for a maximum gas
supply pressure of 50 mbar.

Heating engineer
Installation, use and maintenance manual – GAHP GS/WS 19
3
Non compliant gas pressure may damage the ap-
pliance and be hazardous.
Although it is normal for the inlet pressure to de-
crease during the operation of the appliance, it is
important to check that there are no excessive uc-
tuations in the inlet pressure. In order to limit the
extent of these variations, it is necessary to appro-
priately dene the diameter of the gas inlet pipe
to be adopted based on the length and pressure
drop of the pipe itself, from the gas meter to the
appliance.
If uctuations in the gas distribution pressure
happen, it is advisable to insert a special pressure
stabiliser upstream of the gas inlet to the appliance.
In case of LPG supply, all necessary precautions
must be taken to avoid freezing of the combustible
gas in case of very low external temperatures.
The appliance's gas supply pressure, both static and dy-
namic, must comply with Table 3.3 p.19 , with tolerance
± 15%.
Table3.3Network gas pressure
Product
category Country of destination
Gas supply pressure [mbar]
G20 G25 G25.1 (1)
(2) G25.3 (1) (2) G2.350 (2) G27 (2) G30 G31
II2H3B/P
AL, AT, BG, CH, CY, CZ, DK, EE, FI, GR, HR, IT, LT, LV,
MK, NO, RO, SE, SI, SK, TR 20 30 30
AT, CH 20 50 50
II2H3P
BG, CH, CZ, ES, GB, GR, HR, IE, IT, LT, LV, MK, PT,
SI, SK, TR 20 37
RO 20 30
AT 20 50
II2ELL3B/P DE 20 20 50 50
II2Esi3P FR 20 25 37
II2Er3P 20 25 37
II2HS3B/P HU 25 25 30 30
II2E3P LU 20 50
II2L3B/P NL 25 30 30
II2EK3B/P 20 25 30 30
II2E3B/P
PL
20 37 37
II2ELwLs3B/P 20 13 20 37 37
II2ELwLs3P 20 13 20 37
I2EK NL 20 25
I2E(R) BE 20 25
I2E(S) 20 25
I3P BE 37
IS 30
I2H LV 20
I3B/P MT, CY 30 30
I3B 30
1 GAHP-AR not approved for G25.1, G25.3 gases.
2 GA ACF not approved for G25.1, G25.3, G2.350, G27 gases.
3.9.5 Vertical pipes and condensate
▶ If needed, vertical gas pipes must be tted with siphon
and discharge of the condensate that may form inside
the pipe.
▶ If needed, insulate the piping.
3.9.6 LPG pressure reducers
With LPG the following must be installed:
▶ A rst stage pressure reducer, close to the liquid gas
tank.
▶ A second stage pressure reducer, close to the appli-
ance.
3.10 COMBUSTION PRODUCTS EXHAUST
Compliance with standards
The appliance is approved for connection to a
combustion products exhaust duct for the types
shown in Table 1.1 p.11 .
3.10.1 Flue gas exhaust connection
Ø 80 mm (with gasket), on the left side, at the top, side
panel (outlet A Figures 1.1 p.9 and 1.2 p.10 ).
3.10.2 Indoor version
The appliance is supplied in conguration type B63.

Heating engineer
20
3
3.10.3 Outdoor version
The appliance is supplied complete with air intake and
ue gas exhaust kit to be tted by the installer, shown in
Figure 3.3 p.20 .
Figure3.3Flue gas exhaust outdoor version
A Air intake
B 90° elbow Ø 80
C Pipe Ø 80 300 mm with
terminal
D Collar
3.10.4 Indoor congurations
The possible congurations are shown in the Figures
3.4 p.20 , 3.5 p.20 , 3.6 p.21 , 3.7 p.21 , 3.8 p.21 .
Figure3.4Type C13 coaxial ue gas exhaust
80/125
A DN80/125 2xDN80 splitter
B Wall coaxial terminal 80/125
E Coaxial pipe 80/125 L=1 m (or 2 m)
F Coaxial elbow 90° (or 45°) 80/125
60/100
A DN60/100 2xDN80 splitter
B Wall coaxial terminal 60/100
E Coaxial pipe 60/100 L=1 m (or 2 m)
F Coaxial elbow 90° (or 45°) 60/100
Figure3.5Type C33 coaxial ue gas exhaust
80/125
A DN80/125 2xDN80 splitter
B Coaxial roof terminal 80/125
C Tile adaptor for sloped roof
D Tile adaptor for at roof
E Roof coaxial pipe 80/125 L=1 m (or 2 m)
F Coaxial elbow 90° (or 45°) 80/125
60/100
A DN60/100 2xDN80 splitter
B Coaxial roof terminal 60/100
C Tile adaptor for sloped roof
D Tile adaptor for at roof
E Roof coaxial pipe 60/100 L=1 m (or 2 m)
F Coaxial elbow 90° (or 45°) 60/100