Potterton A-Cubed Operating instructions

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A-Cubed
Gas absorption heat pump
Installation, user and maintenance manual
This manual must be kept with the appliance August 2010

Revision: A
This manual has been drawn up and printed by Potterton Commercial; whole or partial
reproduction of this manual is prohibited.
The original is led at Potterton Commercial.
Any use of this manual other than for personal consultation must be previously authorised by
Potterton Commercial.
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, Potterton Commercial
reserves the right to modify the data and contents of this manual without prior notice.

Installation, user and maintenance manual – GAHP-A
3
INDEX OF CONTENTS
1 PREFACE ............................................................................................................5
2 OVERVIEW AND TECHNICAL CHARACTERISTICS .........................................7
2.1 WARNINGS....................................................................................................................................................................................... 7
2.2 NOTES ON OPERATION OF THE APPLIANCE ......................................................................................................................10
2.3 TECHNICAL MANUFACTURING CHARACTERISTICS.........................................................................................................10
2.4 TECHNICAL DATA ........................................................................................................................................................................11
2.5 DIMENSIONS AND SERVICE PANEL .......................................................................................................................................12
3 NORMAL OPERATION ....................................................................................15
3.1 START UP (AND SHUT DOWN)................................................................................................................................................15
3.2 ON-BOARD ELECTRONICS........................................................................................................................................................17
3.3 RESET OPERATIONS AND MANUAL DEFROSTING ...........................................................................................................19
3.4 OPERATING SETTINGS ...............................................................................................................................................................21
3.5 PROLONGED PERIODS OF DISUSE ........................................................................................................................................22
4 HYDRAULIC SYSTEM INSTALLATION TECHNICIAN ....................................25
4.1 GENERAL INSTALLATION PRINCIPLES ..................................................................................................................................25
4.2 POSITION OF THE APPLIANCE ................................................................................................................................................25
4.3 HYDRAULIC CONNECTIONS ....................................................................................................................................................28
4.4 GAS SUPPLY...................................................................................................................................................................................30
4.5 CONDENSATE DISCHARGE CONNECTION..........................................................................................................................31
4.6 FILLING OF HYDRAULIC CIRCUIT ...........................................................................................................................................32
4.7 FLUE INFORMATION...................................................................................................................................................................33
4.8 PROGRAMMING OF HYDRAULIC PARAMETERS ...............................................................................................................34
5 ELECTRICAL SYSTEM INSTALLATION TECHNICIAN....................................37
5.1 ELECTRICAL DIAGRAMS OF THE APPLIANCE ....................................................................................................................40
5.2 HOW TO CONNECT THE APPLIANCE ELECTRICALLY.......................................................................................................41
5.3 CASCADE CONTROL...................................................................................................................................................................41
5.4 TYPE C (Consent switch)...........................................................................................................................................................53
5.5 HOW TO REMOTELY CONTROL THE FLAME CONTROLLER RESET..............................................................................54
6 INITIAL ACTIVATION AND MAINTENANCE..................................................57
6.1 PROCEDURE FOR INITIAL ACTIVATION................................................................................................................................57
6.2 MAINTENANCE.............................................................................................................................................................................61
6.3 CHANGE OF GAS TYPE ..............................................................................................................................................................62
7 ACCESSORIES..................................................................................................65
8 APPENDIX .......................................................................................................67
8.1 MACHINE OPERATING CODES ................................................................................................................................................67
8.2 SAFETY DEVICES..........................................................................................................................................................................68
8.3 ADDITIONAL SAFETY DEVICES...............................................................................................................................................70
8.4 NON-CONDENSABLE OR NON-ABSORBABLE GASES .....................................................................................................74

4

Installation, user and maintenance manual – GAHP-A
5
1 PREFACE
This Installation, user and maintenance manual is a guide to the installation and operation
of the Air-Water gas absorption heat pump "A-CUBED GAHP-A".
This manual is specically intended for:
• nal users for the use of the appliance according to their own requirements;
• Installation technicians (hydraulic and electrical) for the carrying out of a correct
installation of the appliance.
The manual also contains:
• a section that describes all the operations necessary for the“rst start-up”and for the
“gas change” of the appliance, as well as the main maintenance operations;
• an "ACCESSORIES" section with a description of accessories available and their
respective reference codes.
Summary
The manual has 8 sections:
SECTION 1 is a brief introduction to the use of the manual itself.
SECTION 2 is intended for use by the nal user, hydraulic and electrical installation
technicians and the Potterton Commercial Commissioned Engineer; it gives general
warnings, operating instructions and constructional specications. This section also
contains technical data and dimensional drawings of the appliance.
SECTION 3 is intended for use by the nal user; it provides the information necessary to
use the appliance correctly according to the user's own requirements.
SECTION 4 is intended for use by the hydraulic installation technician; it provides the
indications necessary for the technician for the creation of the hydraulic circuit ue gas
and gas supply system.
SECTION 5 is intended for use by the electrical installation technician; it provides the
information required to hook up the appliance electrically.
SECTION 6 is intended for use by the Potterton Commercial Commissioned Engineer;
it provides the indications necessary to carry out the entire initial activation procedure
(preliminary verication of plant compliance, initial activation, and regulation of gas ow
to the burners) and instructions on how to change the gas type, if required. This section
includes a summary of the main maintenance operations (checks, controls and cleaning
operations to perform) to which the appliance is subject.
SECTION 7 is intended for use by the nal user, hydraulic and electrical installation
technicians and the Potterton Commercial Commissioned Engineer it contains
information about accessories available for the appliance.
SECTION 8 is an appendix which lists the appliance's operating codes and associated
instructions in tabular form.
References
If the appliance is to be connected to a Cascade VAA Direct Digital Controller (DDC), refer
to the following documentation with which it is supplied:
INSTALLATION TECHNICIAN MANUAL - book 1: for installation/service technicians
FINAL USER MANUAL - book 2: for the nal user of the DDC

6
Denitions, terms and icons
APPLIANCE: this term refers to the A-Cubed Air-Water gas absorption heat pump
"GAHP-A".
CCP: "Comfort Control Panel".
CCI: "Comfort Control Interface" device.
DDC: digital control panel (Direct Digital Controller).
The icons present in the margin of the manual have the following meanings:
= DANGER
= WARNING
= NOTE
= START OF OPERATING PROCEDURE
= REFERENCE to another part of the manual or other document

Installation, user and maintenance manual – GAHP-A
7
2 OVERVIEW AND TECHNICAL CHARACTERISTICS
In this section, for all users, you will nd general warnings, the operating principle of the
appliance and its manufacturing characteristics. This section also contains technical data
and dimensional drawings of the appliance.
2.1 WARNINGS
This manual constitutes an integral and essential part of the product and must be
delivered to the user together with the appliance.
Conformity to CE standards
The absorption heat pumps of the GAHP series are certied as conforming to standard EN
12309-1 and -2 and comply with the essential requirements of the following Directives:
• Gas Directive 90/396/EEC and subsequent modications and additions.
• Eciency Directive 92/42/EEC and subsequent modications and additions.
• Electromagnetic Compatibility Directive 89/336/EEC and subsequent modications
and additions.
• Low Voltage Directive 89/336/EEC and subsequent modications and additions.
• “Machinery Directive” 2006/42/EC.
• Pressurised Equipment Directive 97/23/EEC and subsequent modications and
additions.
• UNI EN 677 Specic requisites for condensation boilers with nominal thermal capacity
no greater than 70 kW.
The absorption heat pumps of the GAHP series emit values of nitrogen oxide (NOx) less
than 60 mg/kWh.
Safety
The appliance must only be used for the purposes for which it has been designed. Any
other use is considered inappropriate and therefore dangerous. The manufacturer does
not accept any contractual or extra-contractual liability for any damage caused by
improper use of the appliance.
Do not operate the appliance if, at the moment it is to be used, dangerous conditions
arise: odour of gas in the circuit or near to the appliance; problems with the electrical/
gas mains or hydraulic circuit; parts of the appliance submerged in water or otherwise
damaged; control and safety components bypassed or defective. Ask professionally
qualied personnel for assistance.
If you smell gas:
• do not operate electrical devices in the vicinity of the appliance, such as telephones,
multimeters or other equipment that can cause sparks;
• shut o the gas supply by means of the appropriate gas tap;
• cut o electrical power to the appliance by means of the external disconnecting
switch that the electrical system installation technician has provided in the
appropriate panel;
• request the assistance of professionally qualied personnel from a telephone far
from the appliance.

8
The appliance has a sealed circuit that may be classied as a pressurised container, i.e.
with internal pressure higher than atmospheric pressure. The uids contained in its
sealed circuits are harmful if swallowed or inhaled, or if they come into contact with the
skin. Do not carry out any operation on the sealed circuits of the appliance or on the
valves present.
Packing items (plastic bags, polystyrene foam, nails, etc.) must be kept out of the reach of
children, as they represent potential sources of danger.
The electrical safety of this appliance is assured only when it is correctly connected to an
eective grounding system, as detailed in current electrical safety norms.
Installation and regulatory references
When the appliance arrives at the installation site, before beginning the stages required
to move it in order to position it on the site, perform a visual check to ascertain that there
are no evident signs of breakage or damage to the packaging or to the external panels,
which would be signs that damage occurred during transport.
Packing materials must be removed only after the appliance has been positioned on site.
After removing the packing materials, ensure that the appliance is intact and complete.
Installation of the appliance may only be carried out by rms that are qualied in
accordance with current legislation in the country of installation, i.e. by professionally
qualied personnel.
"Professionally qualied personnel" means personnel with specic technical competence
in the sector of heating/cooling plants and gas appliances.
Installation of the appliance must be carried out in compliance with current local and
national regulations regarding the design, installation and maintenance of heating and
cooling plants in accordance with the manufacturer's instructions.
In particular, current regulations regarding the following must be observed:
• Gas equipment.
• Electrical equipment.
• Heating installations and heat pumps.
The manufacturer does not accept any contractual or extra-contractual liability for any
damage caused by errors in installation and/or failure to observe the above mentioned
regulations and the instructions supplied by the manufacturer itself.
Once the appliance is installed
The rm that has undertaken the installation must provide the owner with a declaration
that the installation has been carried out in compliance with proper workmanship
practices, current national and local regulations, and the instructions supplied by
Potterton Commercial.
Before contacting Potterton Commercial to arrange commissioning:
• the electricity and gas mains specications correspond to the specications on the
nameplate;
• the mains gas pressure falls within the range of values specied in Table 6.1 Network
gas pressure on page 59;
• the gas supplied to the appliance is of the type for which it is designed;
• the gas supply system and water distribution system are sealed;

Installation, user and maintenance manual – GAHP-A
9
• the gas and electricity supply systems are correctly rated for the capacity required
by the appliance and that they are equipped with all safety and control devices
prescribed by current regulations
Check that no safety and control devices are excluded, by-passed or not working
correctly.
Commissioning
The entire procedure for commissioning the appliance must be carried out exclusively by
Potterton Commercial and according to the instructions supplied by the manufacturer.
To carry out the entire procedure correctly, follow the instructions in Section 6.1
PROCEDURE FOR INITIAL ACTIVATION on page 59.
Operation and maintenance of the appliance
To ensure the correct operation of the appliance and to avoid failures, control of the
switching on and o of the appliance must be done in line with the requirements of the
various types of installation.
• If the appliance is connected to the DDC (see Figure 5.3 Direct Digital Control
(DDC) on page 39), the appliance may be switched on and o exclusively by the
DDC itself.
• If the appliance is NOT connected to a Direct Digital Control (DDC) the appliance
may be switched on and o exclusively by a switch on the consent circuit.
The appliance must never normally be switched on and o by shutting o the power
supply upstream of the Controle Device (CCP, DDC or consent switch) before having used
the latter rst and waited for the shutdown cycle to end (approximately 7 minutes). The
shutdown cycle terminates when the hydraulic pump switches o (no parts in motion).
Shutting o the power supply while the appliance is running can irreparably damage its
internal components!
If the appliance fails to operate correctly, with the consequent indication of the Machine
code, follow the instructions of Section 8.1 MACHINE OPERATING CODES on page 67.
In the event of failure of the appliance and/or breakage of any of its parts, refrain from
any attempt to repair and/or restore operation of the appliance through direct action.
• Deactivate the appliance immediately (if permitted and if no condition of danger
exists) by starting the shutdown cycle via the CCP (or DDC or consent switch) and
waiting for it to terminate (approximately 7 minutes);
• Disconnect the appliance from the gas and electricity mains, cutting o gas supply
by means of the appropriate valve and the power supply by means of the external
circuit breaker provided by the electrical system installation technician on the
appropriate panel.
Correct routine maintenance ensures the eciency and good operation of the appliance
over time.
Carry out maintenance operations according to the instructions supplied by the
manufacturer.

10
For maintenance of the appliance’s internal components, contact a Potterton
Commercial Engineer or qualied technician; for other maintenance requirements, see
Section 6.2 MAINTENANCE on page 61.
Any repair of the appliance must be carried out by an authorised Potterton Commercial
Engineer, using only original parts.
Failure to observe the indications given above may compromise the operation and safety
of the appliance, and may invalidate its guarantee, if active.
If the appliance is to be sold or transferred to another owner, ensure that this“Installation,
user and maintenance manual” is handed over to the new owner and installation
technician.
2.2 NOTES ON OPERATION OF THE APPLIANCE
The appliance uses the water/ammoniac absorption thermodynamic cycle (H20 – NH3) to
produce hot water, using atmospheric air as renewable energetic source.
The water/ammoniac thermodynamic cycle used on the unit GAHP-A, is implemented
in a hermitically sealed circuit which has no mechanical unions and is checked directly
by manufacturer to ensure the perfect seal of all joints, thus making refrigerant top ups
completely unnecessary.
Description and general characteristics
The air-water gas absorption heat pump GAHP-A is available in the following versions:
• Version HT: optimised for high temperature heating systems (radiators, fan coils); it
produces hot water to +65°C for heating purposes and up to +70°C for sanitary hot
water.
• Version LT: optimised for low temperature oor heating systems; it produces hot
water to +55°C for heating purposes and up to +70°C for sanitary hot water.
The GAHP heat pump can be controlled with the Direct Digital Control or with a switch
on the consent circuit.
During operation, combustion products are exhausted via the ue discharge terminal
at the left side of the appliance (see Figure 2.1 Size (Standard ventilation) on page 12 or
Figure 2.2 Size on page 13). The fumes outlet must be connected to a ue (for further
details, see Section 4.7 EXHAUSTING THE COMBUSTION PRODUCTS on Page 33).
The appliance is powered with 230 Vac 1N - 50 Hz.
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 managed
by an electronic control unit.
• Titanium stainless steel tube bundle water exchanger, with external insulation.
• Tube coil heat recovery (AISI 304L ).
• Air-based heat exchanger with single-position nned coil, manufactured in steel
tubing and aluminium ns.
• Automatic two-way microprocessor-controlled defrosting valve, allowing the nned
coil to be defrosted.

Installation, user and maintenance manual – GAHP-A
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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 on page 37 and Figure 5.2 Mod10 controller on
page 39).
• Plant water owmeter.
• Sealed circuit high temperature limit thermostat, manual 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 HT technical data
GAHP-A HT GAHP-A HT S
OPERATION WHEN HEATING
OPERATING POINT A7W50 G.U.E. gas usage eciency % 152 (1)
Thermal power kW 35,4 (1)
OPERATING POINT A7W65 G.U.E. gas usage eciency % 119 (1)
Thermal power kW 27,5 (1)
OPERATING POINT A-7W50 G.U.E. gas usage eciency % 125
Thermal power kW 31,5
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 65
maximum for ACS °C 70
Hot water return temperature
maximum heating °C 55
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
gas consumption
methane G20 (nominal) m3/h 2,72 (3)
G30 (nominal) kg/h 2,03 (4)
G31 (nominal) kg/h 2,00 (4)
ELECTRICAL SPECIFICATIONS
Power supply
Voltage V 230
TYPE SINGLE PHASE
Frequency 50 Hz
supply 50
Electrical power absorption nominal kW 0,90 (5)
Degree of protection IP X5D
INSTALLATION DATA
Level of acoustic pressure at 10 meters (maximum) dB(A) 54 (8) 45 (8)
Minimum storage temperature °C -30
Maximum operating pressure bar 4
Water content inside the apparatus l4
Water tting TYPE F
thread " G 1 1/4

12
GAHP-A HT GAHP-A HT S
Gas tting TYPE F
thread " G 3/4
Fume outlet Size mm 80
Residual head Pa 80
Maximum condensation water ow rate l/h 4
Size
width mm 848 (6)
height mm 1281 (6) 1537 (6)
depth mm 1258
Weight In operation kg 390 400
GENERAL INFORMATION
INSTALLATION MODE B23P, B33, B53P
COOLING FLUID AMMONIA R717 kg 7
WATER H2O kg 10
MAXIMUM PRESSURE OF THE COOLING CIRCUIT bar 35
2.5 DIMENSIONS AND SERVICE PANEL
Figure 2.1 – Size (Standard ventilation)
Front and side views (dimensions in mm).

Installation, user and maintenance manual – GAHP-A
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Figure 2.2 – Size
Front and side views (dimensions in mm).
Figure 2.3 – Service plate
Hydraulic/gas unions detail
LEGEND
G Gas tting Ø ¾” F
I Inlet water tting Ø 1¼” F
O Outlet water tting Ø 1¼” F

14

Installation, user and maintenance manual – GAHP-A
15
3 NORMAL OPERATION
In this section you will nd all the indications necessary for the activation, regulation and
control of operation of the appliance depending on the type of installation and control
setup.
• TYPE A (NOT APPLICABLE at PRO Platform): controlled by Comfort Control Panel.
• TYPE B: controlled by DDC (see Figure 5.3 Direct Digital Control (DDC) on page 39).
• TYPE C: controlled by consent switch (e.g. on-o switch, ambient thermostat, timer,
etc.).
3.1 START UP AND SHUT DOWN
Before activating the appliance, check that:
• the gas valve is open;
• the appliance is powered electrically;
• the CCP/DDC are electrically powered;
• the installation technician has ensured that the hydraulic circuit is supplied in the
correct conditions.
If these conditions are satised, it is possible to proceed with activation.
Type A: appliance connected to Comfort Control Panel (CCP)
Type NOT APPLICABLE at PRO platform.
Type B: appliance connected to a Direct Digital Controller (DDC)
If the appliance is connected to a Direct Digital Controller (see Figure 5.3 Direct Digital
Control (DDC) on page 39) and the DDC is in controller mode, activation and control
of the appliance will occur exclusively by operating the DDC. In this case, refer to the
manual supplied with it.
The appliance must never normally be switched on and o by shutting o the power
supply upstream of the DDC before having used the latter rst and waited for the shut-
down cycle to end (approximately 7 minutes). The shutdown cycle terminates when the
hydraulic pump switches o (no parts in motion).
Shutting o the power supply while the appliance is running can irreparably damage its
internal components!
Type C: stand alone appliance
Stand alone appliances must be activated and deactivated only by means of the consent
switch provided by the electrical installation technician.
According to requirements, this consent switch may be an on/o button, an ambient
thermostat, a programmable timer, or one or more volt free contacts controlled by
another process. For details about the type of on/o command installed, contact the
plant’s electrical installation technician.
The appliance must never normally be switched on and o by shutting o the power
supply upstream of the Controle Device (CCP, DDC or consent switch) before having used
the latter rst and waited for the shutdown cycle to end (approximately 7 minutes). The
shutdown cycle terminates when the hydraulic pump switches o (no parts in motion).
Shutting o the power supply while the appliance is running can irreparably damage its
internal components!

16
Start up
Switch on the appliance by means of the on/o command (placing it in the "ON"
position).
When activation is successful, the appliance is managed by the S61 controller in its
electrical panel (see Section 3.2 ON-BOARD ELECTRONICS on page 17). The controller’s
display may be viewed through the viewing hole on the front panel of the unit itself.
During operation, the S61 controller displays operating codes.
If the appliance remains inactive for a prolonged period, it is possible that air is present in
the gas pipes. In this case, activation fails and the appliance reports the operating code:
"u_12" - ame controller arrest (temporary) (see Section 8.1 MACHINE OPERATING CODES
on page 67) and after a brief interval the appliance automatically launches the start up
procedure again. If code (u_12) is signalled 4 times on successive activation attempts,
the code persists, the appliance locks out the ame controller and displays the following
operating code: "E_12" – ame controller arrest (see Section 8.1 MACHINE OPERATING
CODES on page 67). In this case reset is not automatic.
To restore operation of the appliance, carry out a reset of the ame control unit via menu
2 of the controller: the procedure is illustrated in Section 3.3 RESET OPERATIONS AND
MANUAL DEFROSTINGon page 19. After it is reset, the appliance will make a new attempt
to activate.
If the appliance locks out several times, contact a Potterton Commercial Engineer by
calling the Technical Department of Potterton (tel. [phone]).
Shut down
Switch o the appliance via the on/o command (placing it in the "OFF" position).
The shutdown cycle takes approximately 7 minutes to complete.
VISUALISING AND RESETTING OPERATING CODES
Operating codes can be generated:
• by the S61 on-board controller;
• by the CCP/DDC (if present).
The operating codes generated by the S61 controller are displayed on its screen and can
also be viewed on the CCI (if present) or DDC (if present).
Operating codes generated by the controller can be cleared through the board itself or
from the CCI/DDC (if tted and allowed).
For a description of operating codes generated by the controller and how to clear them,
refer to the list of operating codes contained in Section 8.1 MACHINE OPERATING CODES
on page 67.
The controller (see Figure 5.1 Electronic board S61 on page 37) is located inside the
electrical panel of the appliance and the display may be viewed through the viewing
hole on the front panel of the unit itself.
The Machine Codes generated by the CCI/DDC may only be viewed on the display of the
CCI/DDC and may be cleared only through the CCI/DDC.
For the operating codes generated by the CCP/DDC, refer to the manuals supplied with
the unit.

Installation, user and maintenance manual – GAHP-A
17
3.2 ONBOARD ELECTRONICS
The following descriptions refer to the S61 controller with rmware version 3.016.
The appliance is tted with an S61 microprocessor controller with Mod10 combustion
modulation controller mounted above it (see Figure 3.1 On-board controller on
page 17).
The S61 controller, in the electrical panel, controls the appliance and displays data,
messages and operating codes.
Programming, control and monitoring of the appliance take place by interacting with the
display A and knob B shown in Figure 3.1 On-board controller on page 17. The CAN BUS
port connects one or several appliances to the CCP (if present) or a DDC (if present).
The Mod10 controller (see detail D in Figure 3.1 On-board controller on page 17) is used
for combustion modulation.
Figure 3.1 – On-board controller
S61 + Mod10
LEGEND
A 4 digit display
B Knob
C CAN port
D Mod10 controller
Description of menu of S61 controller
The parameters and settings of the appliance are grouped in the menus shown on the
controller’s display:
Table 3.1 – Menu of electronic board
MENU MENU DESCRIPTION THE DISPLAY SHOWS
Menu 0 VIEW DATA (TEMPERATURE, VOLTAGE, PUMP SPEED, ECC...) 0.
Menu 1 VIEW ALL PARAMETERS 1.
Menu 2 ENTER ACTIONS 2.
Menu 3 USER SETTINGS (THERMOSTATING, SET-POINT, T. DIFFERENTIAL) 3.
Menu 4 INSTALLATION TECHNICIAN SETTINGS 4.
Menu 5 TECHNICAL ASSISTANCE CENTRE SETTINGS 5.
Menu 6 TECHNICAL ASSISTANCE CENTRE SETTINGS (MACHINE TYPE) 6.
Menu 7 VIEW DIGITAL IMPUTS 7.
Menu 8 (MENU NOT USED) 8.
E (EXIT MENU) E.
Menu list of electronic board

18
Menus 0, 1 and 7 are Viewing Menus: they only allow the information displayed to be
read, and not modied. Via menu 0 it is possible to view the appliance operating data as
detected by the board in real time; Menu 1 shows the parameters that characterise the
operation of the appliance and their current values.
Menu 7 pertains exclusively to Potterton's Commercial Engineers.
To view the information contained in these menus, proceed as illustrated in the paragraph
"How to access the menus".
Menu 2 is an execution menu: it is used to reset the ame controller, reset errors and
manual defrosting control.
To perform these procedures, see Section 3.3 RESET OPERATIONS AND MANUAL
DEFROSTING on page 19.
Menu 3 is a settings menu: it allows the values displayed to be set. The correct values
of these parameters, for optimum performance of the appliance with the plant to
be used connected, have already been set during installation. In any case, to set
new values for the parameters, see Section 4.8 PROGRAMMING OF HYDRAULIC
PARAMETERS on page 34.
Menus 4, 5, 6 and 7 exclusively concern the installation technician and Potterton
Commercial Engineer.
Menu 8 may currently be selected, but not used.
Display and knob
The controller’s display can be viewed through the glass of the viewing hole on the front
panel of the appliance.
Upon activation, all of the LEDs of the display light up for approximately three seconds,
and then the name of the board, S61, appears. After around 15 seconds after the appliance
powers up, the appliance starts running if the required consent is available.
During correct operation the display shows, alternately, the following information: outlet
water temperature, inlet water temperature, and the dierence between the two water
temperatures (see Table 3.2 Operating information on page 18).
Table 3.2 – Operating information
OPERATING MODE: HEATING
PARAMETER THE DISPLAY SHOWS
Hot outlet water temperature 50.0
Hot inlet water temperature 40.0
Dierential temperature (outlet - inlet) 10.0
Example of data visualised on display: water temperature and dierential
If there are operating problems, the display shows, sequentially, the operating codes
corresponding to the problem detected. A list of these codes with their description and
the procedure to follow to bring the appliance back to correct operation is provided in
Section 8.1 MACHINE OPERATING CODES on page 67.
The knob is used to display or set parameters, or to execute actions/commands (e.g.: a
function or reset), when permitted.

Installation, user and maintenance manual – GAHP-A
19
HOW TO ACCESS THE MENUS
• To use the knob with the special key supplied with the appliance:
You will need: the appliance's electrical power switches set to "ON"; the controller's
display sequentially shows the operating data (temperature, delta T) regarding the
current mode (e.g.: heating) and any active operating codes ("u/E...").
1. Remove the front panel by removing the xing screws.
2. Remove the cover of the electrical panel to access the knob.
3. Use the special key through the hole to operate the knob and access the controller’s
menus and parameters.
4. To display the menus just press the knob once: the display shows the rst menu:
"0." (= menu 0).
5. The display shows “0.”. To display the other menus, turn the knob clockwise; The
display will read, in order: "1.", "2.", "3.", "4.", "5.", "6.", "7.", "8." and "E" (see Table 3.1
Menu of electronic board on page 17).
6. To display the parameters in a given menu (for example, menu 0), turn the knob
until it displays the menu in question (in the example: "0.") and press the knob: the
display will show the rst of the menu’s parameters, in this example "0.0" or "0.40"
(= menu 0, parameter "0" or "40").
7. In the same way: turn the knob to scroll through content (menus, parameters,
actions), press the knob to select/conrm the content (access a menu, display/set
a parameter, execute an action, quit or return to the previous level). For example,
to quit the menus, turn the knob to scroll through menus "0.", "1.", "2." etc. until the
controller displays the quit screen "E"; now press the knob to quit.
In the case of menus 0 and 1, the user can view any parameter. For information about
menu 2, refer to Section 3.3 RESET OPERATIONS AND MANUAL DEFROSTING on page
19. To set the parameters of menu 3, refer to Section 4.8 PROGRAMMING OF HYDRAULIC
PARAMETERS on page 34. The other menus are not for the User: the information in these
menus is dealt with in the sections dedicated to the installation technician or Potterton
Commercial Technical Department.
The special key allows the knob of the electronic board to be operated without opening
the cover of the electrical panel, so that operators are protected from live components.
When the necessary settings have been completed, put away the special key, replace the
cap on the aperture of the electrical panel and ret the front panel of the appliance.
3.3 RESET OPERATIONS AND MANUAL DEFROSTING
There are several possible reasons why the appliance may have error status and therefore
its operation arrested; such an error situation does not necessarily correspond to damage
or malfunction on the part of the appliance. The cause that has generated the error may
be temporary: for example, presence of air in the gas supply line or temporary power
failure.
The appliance can be reset with controller menu 2, the Comfort Control Panel (if present)
or the DDC (if present). In these two latter cases, refer to their documentation.

20
Reset appliance controller
The Table 3.3 Menu 2 on page 20 shows the actions available in menu 2.
For regulatory reasons, the ame controller reset is in a dedicated voice of menu.
Table 3.3 – Menu 2
ACTION REQUIRED FOR EXECUTION SHOWN ON DISPLAY AS
20 Reset ame controller arrest 2. 20
21 Reset other operating codes 2. 21
22 Manual defrost 2. 22
23 Timed forcing to minimum power 2. 23
24 Timed forcing to maximum power 2. 24
25 Regulation of power 2. 25
E (EXIT MENU) 2. E
The general operating codes of the controller can be reset with functions "20" and "21".
ctions "23", "24" and "25" are used to regulate the combustion parameters or for gas
type changeovers, and are thus for use only by the installation technician or Potterton
CommercialTechnical Department (for other information refer to Section 6.1 PROCEDURE
FOR INITIAL ACTIVATION on page 57).
ACTION "20
Reset ame controller arrest; this may be used when the appliance is rst activated,
see Section 3.1 START UP (AND SHUT DOWN) on page 15, when the appliance is in a
permanent locked condition or after a long period of disuse (see Section 3.5 PROLONGED
PERIODS OF DISUSE on page 22).
You will need: access to the electrical panel, see Section "Display and knob".
To reset the ame control unit select menu 2, as indicated in the Section "Accessing the
Menus"; then proceed as follows:
1. The display shows: "2." Press the knob to access the menu. The display initially
shows item "2. 20".
2. Press the knob to display the ashing reset request: "reS1".
3. Press the knob again to reset the ame controller. The reset request stops ashing,
and again the display shows "2. 20". The reset operation has been performed.
4. To quit the menu, turn the knob clockwise until the "2. E" is displayed. Now press
the knob to return to menu selection: "2.".
5. To exit the menu selection and return to the normal visualisation of the parameters
of the appliance, turn the knob clockwise until "E" displays; press the knob to quit.
ACTION "21"
Reset other warnings/errors; this is required to reset any warnings and errors that may
occur during operation of the appliance.
You will need: access to the electrical panel, see Section “Display and knob”.