Robur GAHP Series User manual

Installation, use and maintenance manual
powered by gas and renewable energy
Modular heating unit and heater/chiller
Preassembled groups

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: F
Code: D-LBR563

Installation, use and maintenance manual – RT__ Link 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 Conformity ........................................................................ 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 Circulating pumps.......................................................... p.7
1.3 Coding................................................................................. p.7
1.4 Dimensions and weights.............................................. p.9
1.5 Roma valve...................................................................... p.19
1.6 Independent circulators selector switch
settings............................................................................. p.20
1.7 Electrical specications............................................... p.21
1.8 Electronic boards .......................................................... p.21
1.9 Operation mode............................................................ p.21
1.10 Controls ............................................................................ p.22
1.11 Technical characteristics............................................. p.22
2 Transport and positioning........................................ p.22
2.1 Warnings.......................................................................... p.22
2.2 Handling........................................................................... p.22
2.3 Group positioning ........................................................ p.23
2.4 Minimum clearance distances.................................. p.23
2.5 Mounting base............................................................... p.23
3 Heating engineer............................................................... p.24
3.1 Warnings.......................................................................... p.24
3.2 Hydraulic system........................................................... p.24
3.3 Hydraulic connections ................................................ p.24
3.4 Antifreeze function....................................................... p.27
3.5 Antifreeze liquid............................................................ p.27
3.6 System water quality ................................................... p.28
3.7 System lling .................................................................. p.28
3.8 Fuel gas supply .............................................................. p.29
3.9 Combustion products exhaust ................................ p.29
3.10 Flue gas condensate discharge................................ p.30
3.11 Defrosting water drainage......................................... p.30
3.12 Safety valve drain.......................................................... p.30
4 Electrical installer.............................................................. p.31
4.1 Warnings.......................................................................... p.31
4.2 Electrical systems.......................................................... p.31
4.3 Electrical power supply............................................... p.32
4.4 Set-up and control........................................................ p.33
4.5 Water circulation pumps............................................ p.37
5 First start-up .......................................................................... p.39
5.1 Preliminary checks........................................................ p.39
6 Normal operation.............................................................. p.39
6.1 Warnings.......................................................................... p.39
6.2 Switch on and o.......................................................... p.39
6.3 Messages on the display ............................................ p.40
6.4 Electronic adjustment on the appliance –
Menus and parameters............................................... p.40
6.5 Modifying settings........................................................ p.40
6.6 How to restart the locked-down appliances....... p.40
6.7 Circulators lockout........................................................ p.40
7 Maintenance.......................................................................... p.40
7.1 Warnings.......................................................................... p.40
7.2 Pre-emptive maintenance......................................... p.41
7.3 Scheduled routine maintenance............................. p.41
7.4 Periods of inactivity...................................................... p.42
8 Diagnostics.............................................................................. p.42
8.1 Appliances/controllers................................................ p.42
8.2 Circulating pumps........................................................ p.42
9 Appendices.............................................................................. p.43
9.1 Wiring diagrams and internal wirings................... p.43
9.2 Circulating pumps........................................................ p.49
INDEX OF CONTENTS

Introduction
4
I
I INTRODUCTION
Manual
This Manual is an integral part of the RT__ Link and must
be handed to the end user together with the preassem-
bled group.
I.1 RECIPIENTS
This Manual is intended for:
▶ end user, for appropriate and safe use of the preassembled
group;
▶ qualied installer, for correct installation of the preasslem-
bled group;
▶ planner, for specic information on the preassembled group.
I.2 CONTROL DEVICE
In order to be able to work, the RT__ Link unit needs a control
device (DDC, CCP/CCI), which must be connected 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
Appliance/Module (or Units) GAHP/GA/AY = equivalent
terms, both used to designate single gas-red heat/chiller ap-
pliance (GAHP A/AR/GS/WS, or GA ACF/HR/TK absorption chiller
or AY00-120 condensing boiler), part of the preassembled unit
together with other modules/appliances.
TAC = Technical Assistance Centre authorised by Robur.
CCI Controller (Comfort Controller Interface) = optional Robur
control device which lets you manage up to three modulating
heat only GAHP units (A, WS, GS).
CCP Controller (Comfort Control Panel) = Robur control de-
vice which lets you manage in modulation mode up to three
GAHP units and all system components (probes, diverter/mixing
valves, circulating pumps), including any integration boiler.
DDC Control (Direct Digital Controller) = optional Robur device
to control one or more Robur appliances (GAHP heat pumps, GA
chillers and AY boilers) in ON/OFF mode.
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.
Preassembled Group / RT__ Link = equivalent terms, both
used to designate the generic heat/chiller hydronic group con-
sisting of GAHP/GA/AY modules (see denition).
RTAR/RTCF/RTY/RTA/RTAY/RTYR/.. .Link to = initials to desig-
nate a specic heat/chiller preassembled group, consisting of a
specic combination of GAHP/GA/AY (see denition).
First start-up = preassembled group commissioning operation
that can only and exclusively be performed by a TAC.
III WARNINGS
III.1 GENERAL AND SAFETY WARNINGS
GAHP/GA/AY modules
As far as the individual GAHP/GA/AY appliances/modules
belonging to the preassembled group are concerned,
read the warnings in the respective Manuals (attached),
with particular regard to the following aspects:
Poisoning
Moving parts
Burn hazard
Pressure vessels
Water-ammonia solution
Limescale and corrosion
Chloride concentration
Aggressive substances in air
Switching the appliances o
Qualication of the installer/conductor/maintainer
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.

Warnings
Installation, use and maintenance manual – RT__ Link 5
III
Misuse
The preassembled group must only be used for the pur-
poses 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 man-
ufacturer's instructions.
Hazardous situations
Do not start the preassembled group in hazardous con-
ditions such as: gas odor, hydraulic/electric/gas system
problems, parts of the unit immersed in the water or
damaged, malfunction, deactivation or exclusion of con-
trol and safety 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.
Do not entrust children, persons with physical, sensory
or mental disabilities or persons with poor knowledge
and experience with use of the preassembled appliance.
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 operate electrical devices near the preassembled
group (eg telephones, multimeters or other appliances
that can cause sparks).
Shut o the gas supply by turning the valve o.
Disconnect electrical power supply by means of the
external isolation switch in the power supply electrical
panel.
Ask for qualied personnel from a phone away from the
preassembled group.
Electrocution hazard
Within the preassembled group (and the appliances that
compose it) there are live parts.
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.
Make sure the preassembled group and the individual
GAHP/GA/AY modules of the same can not be reactivat-
ed inadvertently.
Connection and disconnection
For the RT__ Link electrical connection and disconnec-
tion operations follow the procedure described in Para-
graph 7.1 p.40 .
Earthing
Electrical safety depends on an eective earthing sys-
tem, properly connected to the preassembled group
and executed in accordance with current regulations.
Distance from combustible or ammable materials
Do not deposit ammable materials (paper, diluents,
paints, etc.) near the preassembled group.
Acid ue gas condensate
If condensing units are present in the preassembled
group:
Discharge the acid condensate of combustion ue gas,
as indicated in Paragraph 3.10 p. 30 , in compliance
with current exhaust regulations.
Shutting down the preassembled group
Interrupting the power supply during the operation of
the preassembled group may cause permanent damage
to the internal components.
Except for a hazard, do not interrupt the power supply to
turn o the preassembled group, but always and exclu-
sively use the provided control device (DDC or CCP/CCI).
In the event of failure
Operations on internal components and repairs may
exclusively be carried out by a TAC, using only original
parts.
In the event of a failure of the preassembled group, or of
one or more of the individual appliances that make it up
and/or break parts of it, refrain from any repair or restora-
tion attempt and contact the TAC immediately.
Routine maintenance
Proper maintenance ensures the eciency and good op-
eration of the preassembled group over time.
Maintenance must be performed according to the man-
ufacturer's instructions (see Chapter 7 p. 40 ) 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.
Maintenance of GAHP/GA/AY modules
For the maintenance of the individual GAHP/GA/AY
modules belonging to the preassembled group, consult
their respective Manuals (attached).
Decommissioning and disposal
If the preassembled group or some of the individual
GAHP/GA/AY appliances/modules are to be dismantled,
please contact the manufacturer for disposal.
Keep the Manual
This "Installation, Use, and Maintenance Manual", includ-
ing all attached documents, must always accompany the
preassembled group and must be delivered to the new
owner or installer for sale or transfer.

Warnings
6
III
III.2 CONFORMITY
EU Directives and standards
The GAHP/GA/AY modules/appliances that are part of RT__ Link,
namely the GAHP series heat pumps, GA ACF series chillers, and
AY00-120 condensing boilers comply with the essential re-
quirements of the following standards and directives, each as
applicable:
▶ Eciency Directive 92/42/EEC and subsequent modica-
tions and additions.
▶ 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.
▶ EN 12309 appliances for gas-red heating and/or cooling
absorption.
▶ EN 677 Specic requirements for condensing boilers with
nominal heat input up to 70 kW.
▶ 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 air conditioning systems, heat pumps and chill-
ers.
▶ 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 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 guarantee of the individual GAHP/GA/
AY modules/units belonging to the preassembled group
may be invalidated under 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
plant 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 – RT__ Link 7
1
1 FEATURES ANDTECHNICAL DATA
For the characteristics of the individual modules (GAHP/GA/AY
units) that make up the RT__ Link, and of the control devices
(DDC, CCP/CCI, ...), refer to the respective Manuals (attached).
1.1 FEATURES
Preassembled groups
The RT__ Links are gas powered (natural gas or LPG) heating/
cooling sets, to supply hot and/or chilled water. Each group con-
sists of a certain number of individual gas powered modules/
heating/cooling appliances (GAHP/GA/AY units). The set of ap-
pliances and components is preassembled at the factory, form-
ing a complete hydronic group already predisposed to be simply
connected to the system.
Application
Each preassembled group according to its conguration (RTAR,
RTCF, RTY, RTAY, RTYR, RTA, ... Links) is able to simultaneously or
alternatively deliver heating, cooling, DHW production and heat
recovery, according to the needs of each single installation, with
a signicantly extensive range of heating and cooling output.
The various hydronic models (RTAR, RTCF, ... Links) are suitable
for all heating and cooling systems operating with hot and/or
chilled water, with common heat exchangers (e.g. radiators,
fan coils, radiant panels, fan heaters, air handling units, DHW
production boilers, pool heat exchangers...), including process
plants (industrial heat exchangers).
Manufacturing features
Each preassembled group, in addition to the GAHP/GA/AY heat-
ing/cooling modules/units gas powered, is composed of:
▶ delivery/return stainless steel hydraulic manifolds, insulated
with rigid cups lined with aluminum sheet;
▶ galvanized steel gas outlet manifold;
▶ exible connecting couplings of individual units to hydraulic
and gas manifolds;
▶ condensate discarge manifold (only if A/GS/WS/AY condens-
ing appliances are included);
▶ electrical panel with protection devices (2 electrical panels
with more than 5-6 modules);
▶ bearing structure with galvanized steel sections.
Table1.1Fittings diameter
Installation data
Gas tting diameter 1 1/2”F
Water ttings diameter (inlet/outlet) 2” M
Condensation discharge tting diameter 1” F
Composition (GAHP/GA/AY modules)
The gas heating/cooling modules that make up a RT__ Link can
be:
▶ GAHP units, A/AR/GS/WS versions, absorption heat pumps;
▶ GAHP units, A/AR/GS/WS versions, absorption chillers;
▶ AY unit, condensing boiler.
distinguished in:
▶ aerothermal units (A, AR, ACF, HR, TK, LB);
▶ hydrothermal (WS) and geothermal (GS) units.
in variable number:
▶ from 2 to 5 in the case of GAHP/GA only
▶ from 2 to 8 in the case of GAHP/GA and AY
Groups with aerothermal units must be installed exclusively out-
side, while others may be installed either indoors or outdoors.
The aerothermal modules of RT__ Links may be in conguration:
▶ with standard fans (STD);
▶ with silenced fans (SIL or S1).
Congurations
▶ without circulators or with circulators (standard or oversize
circulators);
▶ 2, 4 or 6 pipes, ie 1, 2 or 3 pairs of delivery/return hydraulic
collectors/connections for hot and/or cold water, connected
as needed.
1.2 CIRCULATING PUMPS
Preassembled groups without water circulation pumps
If the RT__ Link is without circulators, It must be installed on the
hydraulic/primary circuit at least one circulation pump, suitably
selected and rated (by the designer/installer).
Preassembled groups with water circulation pumps
In the RT__ Links already provided with circulators, each individ-
ual GAHP/GA/AY module that is part of the group has (at least) a
single independent circulator.
The circulators are installed externally to the GAHP/
GA units, which have a special protection cover (Figure
1.14 p.19 ), while for AY00-120 units the circulators are
installed internally to the unit itself.
The available head at the hydraulic connections of the preas-
sembled group should be considered net of internal pressure
drops, in the units and in the hydraulic manifolds.
Table 1.2 p. 7 provides the minimum residual head at the
nominal ow in the largest conguration.
Table1.2Minimum residual head
residual head [m w.c.]
Wilo Yonos 25/0,5-7 2,0
Wilo Yonos 25/0,5-10 3,5
Wilo Stratos Para 25/1-11 2,0
Wilo Stratos Para 25/1-12 5,0
See the Design Manual for more detailed ow, head and pres-
sure drop data.
1.3 CODING
Each group is encoded with a series of letters and digits that dis-
tinguish its composition and conguration. In order:
1. (3 or 4 letters) = group type (eg RTAR, RTCF, RTAY, RTA, RTY,
...), based on composing modules (GAHP A/AR/WS/GS, GA
ACF/HR/TK/LB, AY00-120;
2. (2 or 3 digits) = cold power, given by the sum of the cold
powers of the individual modules;
3. (2 or 3 digits) = heat power, given by the sum of the heat
powers of the individual modules;
4. (_, /4 or /6) = number of pipes, ie delivery/return manifold
pairs (1, 2 or 3);
5. (2 letters) = modules type;
6. (_, S, S1) = standard or silenced fans (only for aerothermal
units);
7. (MET/NAT, G25, GPL/LPG) = combustible gas (natural gas or
LPG);
8. (2 or 3 letters) = nationality;

Features and technical data
8
1
9. (2 letters) circulators (with or without) and type (standard or
oversize);
10. (1 letter) predispositions, if any.
The 1.1 p. 8 table/gure exemplies the meaning of the en-
coding in detail, providing the key for reading any possible com-
position and conguration, starting from an example.
Figure1.1

Features and technical data
Installation, use and maintenance manual – RT__ Link 9
1
1.4 DIMENSIONS AND WEIGHTS
The dimensions are given for the maximum footprint
conguration.
The weights are given for the maximum weight cong-
uration.
Hydraulic/gas connections
Figure1.2Water, gas and condensate discharge ttings position, for 2
pipes groups - Right side view (dimensions in mm)
A Condensate discharge connection [1" F] (only for groups with more than
one condensing unit)
B Gas connection [1 1/2" F]
C Cold/hot water outlet [2" M]
D Cold/hot water inlet [2" M]
* The height of low-noise model is 1650 mm
Figure1.3Position of water, gas and condensate connections for
4-pipe groups - Right side view (dimensions in mm)
A Condensate discharge connection [1" F] (only for groups with more
than one condensing unit)
B Gas connection [1 1/2" F]
C Cold/hot water outlet [2" M]
D Cold/hot water inlet [2" M]
E Hot return [2" M]
F Hot delivery [2" M]
* The height of low-noise model is 1650 mm

Features and technical data
10
1
Figure1.4Position of water, gas and condensate connections for 6-pipe groups - Top view (dimensions in mm)
A Condensate discharge connection [1" F] (only for groups with more than one condensing unit). Sloping manifold, strictly connect on right side
B Gas connection [1 1/2" F]
C Cold/hot water outlet [2" M]
D Cold/hot water inlet [2" M]
E ACF HR recovery hot return (only left connection) [2" M]
F ACF HR recovery hot delivery (only left connection) [2" M]
G Hot return (only right connection) [2" M]
H Hot delivery (only right connection) [2" M]
Figure1.5Position of water, gas and condensate connections for RTGS/WS groups - Right side view (dimensions in mm)
A Condensation drain connection [1 " F]
B Gas connection [1 1/2" F]
C Hot return [2" M]
D Cold return [2" M]
E Hot delivery [2" M]
F Cold delivery [2" M]

Features and technical data
Installation, use and maintenance manual – RT__ Link 11
1
Figure1.6Preassembled ACF/A/AR group (with 2, 3, 4 and 5 units) - Dimensions and weights of preassembled units - front view (dimensions in mm)
A 960 kg
B 1440 kg
C 1920 kg
D 2410 kg

Features and technical data
12
1
Figure1.7Preassembled AY group (with 2, 3, 4 and 5 units) - Dimensions and weights of preassembled groups - front view (dimensions in mm)
A 2 AY 330 kg
B 3 AY 450 kg
C 4 AY 580 kg
D 5 AY 700 kg
Note: The weight refers to links congured with oversize circulators

Features and technical data
Installation, use and maintenance manual – RT__ Link 13
1
Figure1.8Preassembled ACF/A/AR + AY group (with 1+1, 1+2, 1+3, 1+4 units) - Dimensions and weights of preassembled groups - front and top
view (dimensions in mm)
A 1+2 790 kg (*)
B 1+3 970 kg 1+4 1070 kg (*)
(*) The weight refers to a 2 pipe link (silent ventilation, "S"), congured with oversize circulators
The GAHP/GA + 1 AY00-120 congurations are replaced
by the Gitié units.

Features and technical data
14
1
Figure1.9Preassembled ACF/A/AR + AY group (with 1+5, 2+1 and 2+2 units) - Dimensions and weights of preassembled groups - front and top
view (dimensions in mm)
A 1+5 1210 kg (**)
B 2+1 1150 kg (*) 2+2 1270 kg (*)
(*) The weight refers to a 2 pipe link (silent ventilation, "S"), congured with oversize circulators
(**) The weight refers to a 4 pipe link (silent ventilation, "S"), congured on both circuits with oversize circulators

Features and technical data
Installation, use and maintenance manual – RT__ Link 15
1
Figure1.10Preassembled ACF/A/AR + AY group (with 2+3, 2+4 and 2+5 units) - Dimensions and weights of preassembled groups - front and top
view (dimensions in mm)
A 2+3 1460 kg (*) 2+4 1560 kg (**)
B 2+5 1700 kg (**)
(*) The weight refers to a 2 pipe link (silent ventilation, "S"), congured with oversize circulators
(**) The weight refers to a 4 pipe link (silent ventilation, "S"), congured on both circuits with oversize circulators

Features and technical data
16
1
Figure1.11Preassembled ACF/A/AR + AY group (with 3+1, 3+2 and 3+3 units) - Dimensions and weights of preassembled groups - front and top
view (dimensions in mm)
A 3+1 1630 kg (*) 3+2 1750 kg (*)
B 3+3 1880 kg (**)
(*) The weight refers to a 2 pipe link (silent ventilation, "S"), congured with oversize circulators
(**) The weight refers to a 4 pipe link (silent ventilation, "S"), congured on both circuits with oversize circulators
B
137
155415291554
137
4936

Features and technical data
Installation, use and maintenance manual – RT__ Link 17
1
Figure1.12Preassembled ACF/A/AR + AY group (with 3+4 and 3+5 units) - Dimensions and weights of preassembled groups - front and top view
(dimensions in mm)
A 3+4 2060 kg (*)
B 3+5 2190 kg (*)
(*) The weight refers to a 4 pipe link (silent ventilation, "S"), congured on both circuits with oversize circulators
B
A

Features and technical data
18
1
Figure1.13Preassembled ACF/A/AR + AY group (with 4+1, 4+2, 4+3 and 4+4 units) - Dimensions and weights of preassembled groups - front and
top view (dimensions in mm)
A 4+1 2120 kg (*) 4+2 2240 kg (**)
B 4+3 2380 kg (**) 4+4 2480 kg (**)
(*) The weight refers to a 2 pipe link (silent ventilation, "S"), congured with oversize circulators
(**) The weight refers to a 4 pipe link (silent ventilation, "S"), congured on both circuits with oversize circulators
A
B

Features and technical data
Installation, use and maintenance manual – RT__ Link 19
1
1.5 ROMA VALVE
Preassembled groups equipped with water circulation pumps
are also equipped with a check valve, mounted downstream of
each water circulation pump, equipped with air vent valves, as
detailed in the following Figure 1.14 p. 19 for the GAHP/GA
units and in the following Figure 1.15 p. 19 for the AY00-120
units.
Figure1.14Roma valve GAHP/GA units
A Protection cover
B Protection cover
C Valve insulation
D Roma valve
E Air-vent valve
F Air-vent valve
G Circulator
H Connection to return
manifold
Figure1.15Roma valve AY00-120 units
D Roma valve
E Air vent
E Air vent
G Circulator
H Connection to return
manifold
H
E
F
G
D

Features and technical data
20
1
1.6 INDEPENDENT CIRCULATORS SELECTOR
SWITCH SETTINGS
In the RT__ Links already provided with circulators, each circu-
lator is provided with a selector switch to determine the driving
mode of the circulator itself.
ForWilo Stratos Para circulators (available as optional), the selec-
tor switch is set as shown in Figure 1.16 p.20 , depending on
the type of unit to which the circulator is connected.
Figure1.16Wilo Stratos Para circulator selector switch setting
A GAHP A, GAHP GS/WS
B GAHP-AR, GA ACF, AY00-120
For Wilo Yonos Para circulators (standard on RT__ Links already
provided with circulators) the selector switch must be set as
shown in Figure 1.17 p.20 .
Figure1.17Wilo Yonos circulator selector switch setting