Robur GAHP-W Installation and operating instructions

GAHPLine W and W LB Series
Absorption heat pump
for heating and cooling medium-large areas
Fired by natural gas fired/LPG and renewable energy
Installation, use and
maintenance manual

GAHP-W – Installation, start-up, use and maintenance manual
2Edition: 2014-08
EDITION: 2014-08
CODE: D-LBR367
This manual was written and printed by Robur Corporation; part or total reproduction of
this manual is prohibited.
The original is filed in Robur Corporation.
Any use of this manual other than for personal consultation must be previously authorized
by Robur Corporation.
The rights of those who have legitimately filed the registered trademarks contained within
this publication are not affected.
With the aim of continuously improving the quality of its products, Robur Corporation
reserves the right to modify the data and contents of this manual without prior notice.

Index
Ed. 2014-08 1
TABLE OF CONTENTS
SECTION 1 WARNINGS ...................................................................................................3
SECTION 2 OVERVIEW AND TECHNICAL SPECIFICATIONS .......................................7
2.1 GAHP-W – TECHNICAL SPECIFICATIONS 8
2.2 CODES 12
2.3 LOCATION OF THE APPLIANCE 13
2.4 GAHP-W AND GAHP-W LB DIMENSIONS 14
2.5 PLACING OF THE APPLIANCE 15
2.6 VENTING AND COMBUSTION AIR 17
2.7 GAS SUPPLY AND PIPING 24
2.8 WATER CONNECTIONS 27
2.9 DUCTING OF THE SAFETY VALVE 31
SECTION 3 ELECTRICAL CONNECTIONS ...................................................................33
3.1 S61 AND ROBUR ELECTRICAL DIAGRAM KEY 34
3.2 OPERATION OF THE APPLIANCE THROUGH R-W-Y CONTACTS ON THE ELECTRONIC
BOARD (WITHOUT ROBUR OPTIONAL DIRECT DIGITAL CONTROLLER - DDC) 37
3.3 OPERATION OF THE APPLIANCE THROUGH ROBUR DIRECT DIGITAL CONTROLLER (DDC)
40
3.4 OPERATION OF THE GAHP-W AND W-LB 44
SECTION 4 END USER ..................................................................................................47
4.1 STARTING AND SHUTTING DOWN OF THE APPLIANCE 47
4.2 LONG INACTIVITY PERIOD 48
4.3 ELECTRONIC BOARD 48
4.4 RESET 51
4.5 BASIC SET UP 51
4.6 UNIT START UP 53
4.7 MAINTENANCE 55
4.8 CHANGE OF GAS TYPE 56
4.9 OPERATING CODES - TROUBLESHOOTING (firmware release 3.023) 57
APPENDIX A.....................................................................................................................61

GAHP-W – Installation, start-up, use and maintenance manual
2Edition: 2014-08
PREFACE
This manual supplies information for the installation, operation and servicing of the Robur
Water-Water Gas Absorption Heat Pump GAHP-W and the Robur Water-Water Gas
Absorption Heat Pump GAHP-W LB.
It is strongly recommended that this manual be completely reviewed before proceeding
with an installation.
This manual is specifically intended for:
- End users: for the operation of the appliance according to their own
requirements;
- Contractors for a correct hydraulic and electric installation of the appliance.
Retain this manual for future reference.
Danger
Warning
Note
Start of operating procedure
Reference to another part of the manual or other document
Table 1 Description icons

Warnings
Ed. 2014-08 3
SECTION 1 WARNINGS
This manual is designed to be an installation and user’s guide for the Robur GAHP-
W, Gas Absorption Heat Pumps series.This product must be installed, started up
and serviced by a qualified installer.
Improper installation and/or operation could create carbon monoxide gas in flue
gases which could cause serious injury, property damage, or death.
Improper installation and/or operation will void the warranty.
As an additional measure of safety, Robur strongly recommends installation
of suitable Carbon Monoxide (CO) detectors in the vicinity of this appliance
and in any adjacent occupied spaces.
If the information in this manual is not followed exactly, a fire or explosion may
result causing property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of
this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
•Do not try to light any appliance.
•Do not touch any electrical switch; do not use any phone in your building.
•Immediately call your gas supplier from a nearby phone. Follow the gas supplier's
instructions.
•If you cannot reach your gas supplier, call the fire department.
DO NOT Use this appliance if any part has been under water. The possible
damage to a flooded appliance can be extensive and present numerous safety
hazards. Any appliance that has been under water must be replaced.
Consult and follow local Building and Fire Regulations and other Safety Codes that
apply to this installation. Consult your local gas utility company to authorize and
inspect all gas and flue connections.
Your conventionally vented gas appliance must have a supply of fresh air
circulating around it during burner operation for proper gas combustion and proper
venting.
Packing items (plastic bags, polystyrene foam, nails, etc.) must be kept out of the
reach of children, as they are potentially dangerous.
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

GAHP-W – Installation, start-up, use and maintenance manual
4Edition: 2014-08
manufacturer does not accept any contractual or extra-contractual liability for any
damage caused by improper use of the appliance.
The appliance is not intended to be used by persons (including children) whose
physical, sensory and mental capacities are impaired, or who lack the necessary
experience and knowledge, unless they are supervised or instructed in its use by
persons responsible for their safety. Children must be supervised to ensure that
they do not play with the appliance.
The unit uses a water/ammonia absorption cycle for hot/cold water production. The
ammonia is in a water solution inside a sealed circuit tested for leaks by the
manufacturer. In case of refrigerant leaks, switch off the electrical power and gas
supplies only if this can be done in total safety. Contact your Authorised Service
Center.
The safety valve must be ducted to the outdoors. Refer to Chapter 2.9 on page 31.
The unit MUST NOT BE OPERATED if the safety valve is not ducted.
Frequent water filling in the loop may result in unit damage due to scale and
corrosion, depending on the quality of the water being used. Make sure the system
is water tight and that the expansion tank is operational.
Concentrations of chlorides or free chlorine in the circuit above the values given in
Table 17 on page 31 will damage the unit heat exchangers and void the warranty.
Shut off the gas supply before working on the gas circuit. Upon completing work on
the gas circuit, check for leaks as required by regulations.
Do not operate the appliance if dangerous conditions exist: smell of gas in the
pipeline or near the appliance; parts of the appliance submerged in water or
otherwise damaged; controls or safety components bypassed or defective.
In these cases, ask for assistance to a qualified installer or Service Company.
Do not remove safety guards because there are components moving also during
the start-up and shut-down cycles of the unit. Make sure the appliance cannot be
started up inadvertently.
POISONING HAZARD
Make sure the flue gas components are tightly sealed and compliant with local and
national regulations.
If the appliance is installed indoors, insufficient or non compliant ventilation (see
installation instructions) can result in dangerous leak of flue gases. If the installation
is not compliant, do not start up the appliance.
Inform the installer and the end user.

Warnings
Ed. 2014-08 5
FIRE HAZARD
The appliance contains hot parts. Do not open the appliance or touch the flue outlet
pipe. If necessary, contact a qualified service company.
The appliance has a sealed circuit classified as pressure equipment, i.e. with
internal pressure higher than atmospheric pressure. The fluids contained in the
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 circuit or its valves.
ELECTRIC SHOCK HAZARD
•Use only approved components for the electrical connections, as specified by
the manufacturer.
•Disconnect the electrical power supply before working on the appliance's internal
electrical equipment (electrical panel, motors, control board, etc.).
•Make sure the appliance cannot be started up inadvertently.
The electrical safety of the appliance is ensured only when it is correctly connected
to an efficient grounding system, compilant with local and national safety regulations
HARMFULL SUBSTANCES IN THE AIR
Hydrogenated hydrocarbons, which contain chlorine and fluorine compounds, will
increase the corrosion of the unit.
Make sure the air supply is free of harmfull substances.
SUGGESTIONS FOR THE CLIENT
Stipulate a maintenance contract with an authorised contractor for the annual
inspection of the appliance and maintenance when needed.
Maintenance and repairs may only be done by a contractor legally authorised to
work on gas appliances and equipment.
Use only original spare parts.

GAHP-W – Installation, start-up, use and maintenance manual
6Edition: 2014-08

Overview and technical specifacions
Ed. 2014-08 7
SECTION 2 OVERVIEW AND TECHNICAL SPECIFICATIONS
This manual supplies information for the installation, operation and servicing of the Robur
Water-Water Gas Absorption Heat Pump GAHP-W and the Robur Water-Water Gas
Absorption Heat Pump GAHP-W LB.
Read this manual carefully before installation.
The Robur GAHP-W (Gas Absorption Heat Pump) is available in 2 versions:
•GAHP-W: this is a water-to-water gas fired absorption heat pump which has been
designed to recover thermal energy from water sources (wells, rivers, lakes, process
water, etc…). It can be used for heating, cooling and DHW production.
•GAHP-W LB: this is a also a water-to-water gas fired absorption heat pump which has
been designed to recover thermal energy from the ground through geothermal piping
(not supplied) either vertically or horizontally. It can be used for heating, cooling and
DHW production.
The Robur GAHP-W is controlled by two electronic boards:
- S61 electronic board
- W10 board
The operating temperatures are measured by the following 6 probes:
- Cod water outlet
- Cold water inlet
- Hot water outlet
- Hot water inlet
- Refrigerant temperature condenser inlet
- Ambient temperature
Other safety and control devices:
- Manual reset high temperature limit (for sealed system).
- Automatic reset flue gas thermostat.
- Cold water flow switch.
- Hot water flow switch.
- Ignition control box.
- Flue gas pressure switch.
- Oil pump rotation sensor.
- High temperature limit (for hot water).
- Sealed system relief valve (to be ducted as indicated in chapter 2.9 on page 31).
- Water antifreeze function.
- Direct Digital Controller (DDC) available as an optional.

GAHP-W – Installation, start-up, use and maintenance manual
8Edition: 2014-08
2.1 GAHP-W – TECHNICAL SPECIFICATIONS
GAHP-W GAHP-W LB
PERFORMANCE RATINGS
EVAPORATOR INLET TEMPERATURE (COLD SIDE) °F 50 32
CONDENSER OUTLET TEMPERATURE (HOT SIDE) °F 122 122
HEATING CAPACITY (1) kBtu/h 132.4 119.4
EFFICIENCY (HEATING) % 139 125
CHILLING CAPACITY (1) kBtu/h 54.6 46.1
EFFICIENCY (CHILLING) % 57 48
HOT WATER FLOW RATE GPM 14.5 13.2
T HOT SIDE °F 18 18
HOT SIDE PRESSURE DROP (CONDENSER) Ft (WC)
PSIg
12.7
5.51
10.5
4.50
CHILLED WATER FLOW RATE GPM 12.3 11.0
T COLD SIDE °F 9 9
COLD SIDE PRESSURE DROP (EVAPORATOR) kPa
PSIg
12.7
5.51
15.4
6.67
OPERATIONAL LIMITS
COLD SIDE WATER FLOW RATE (EVAPORATOR) – MIN/MAX GPM 10.1/20.7 8.8/17.6
EVAPORATOR MAXIMUM INLET TEMPERATURE °F 113.0 113.0
EVAPORATOR MINIMUM OUTLET TEMPERATURE °F 37.4 23.0
HOT SIDE WATER FLOW RATE (CONDENSER) – MIN/MAX GPM 6.2/22.0
HOT WATER MINIMUM RETURN TEMPERATURE IN CONTINUOUS
OPERATION (6) °F 68
CONDENSER MAXIMUM INLET TEMPERATURE °F +113.0
CONDENSER MINIMUM INLET TEMPERATURE °F +35.6
CONDENSER MAXIMUM OUTLET TEMPERATURE °F 149 140
AMBIENT TEMPERATURE - MIN/MAX °F 10.4/113.0
BURNER SPECIFICATIONS
NOMINAL HEAT CAPACITY (14.4 PSI – 68 °F) kBtu/hr 95.5
ELECTRICAL RATINGS
REQUIRED VOLTAGE, 60HZ, SINGLE PHASE (2) V 208-230
MINIMUM CIRCUIT AMPACITY (MCA) Unit only A 15
MAXIMUM OVER CURRENT PROTECTION (MOCP) A 15
TOTAL ELECTRICAL OPERATING CONSUMPTION (NOMINAL) (3) kW 0.4
PHYSICAL DATA
OPERATING WEIGHT Pounds 630.5
WATER VOLUME PER WATER CIRCUIT (4) Gallons 0.79
DIMENSIONS WIDTH
DEPTH
HEIGHT
Inches
33-1/4
25-3/4
50-3/4
INLET/OUTLET WATER PIPE DIAMETERS FPT 1” 1/4
GAS PIPE DIAMETER FPT 1/2
DIAMETER EXHAUST FLUE PIPE (5) Inches 3-1/8
Table 2 - GAHP-W performance ratings and operational limits.
(1) ALL ILLUSTRATIONS AND SPECIFICATIONS CONTAINED HEREIN ARE BASED ON THE LATEST INFORMATION AVAILABLE AT
THE TIME OF PUBLICATION APPROVAL. ROBUR RESERVES THE RIGHT TO MAKE CHANGES AT ANY TIME WITHOUT NOTICE, IN
MATERIALS, SPECIFICATIONS, AND MODELS OR TO DISCONTINUE MODELS.
(2) UNITS ARE FACTORY-WIRED FOR 230 VOLT OPERATION.
(3) MAY VARY BY ±10% AS A FUNCTION OF BOTH POWER SUPPLY AND ELECTRICAL MOTOR INPUT TOLERANCE.
(4) THE UNIT HAS 2 WATER CIRCUITS. THE VALUE IS REFERRED TO A SOLUTION OF QUALITY TAP WATER AND 10% BY VOLUME
OF INHIBITED PERMANENT ANTIFREEZE. HIGHER ANTIFREEZE CONCENTRATIONS MAY BE REQUIRED IN CERTAIN
APPLICATIONS. MONO-ETHYLENE GLYCOL MAY CAUSE CORROSION IN GALVANIZED METAL PIPES.
(5) FOR EXHAUST DUCT DIMENSIONS SEE , PAGE 62.
(6) IN TRANSIENT OPERATION, LOWER TEMPERATURES ARE ALLOWED.

Overview and technical specifacions
Ed. 2014-08 9
GAHP-W – HEATING AND CHILLING CAPACITIES
Table 3 - GAHP-W heating capacity. DT is the difference between outlet and inlet temperature.
Table 4 - GAHP-W chilling capacity. DT is the difference between outlet and inlet temperature.
GAHP-W HEATING CAPACITY - kBtu/hr
HOT WATER INLET TEMPERATURE
77.0 86.0 95.0 104.0 113.0 113.0
CHILLED
WATER INLET
TEMPERATURE DT=18 DT=36
46.4 142.4 140.0 136.0 129.0 121.5 117.7
50.0 142.6 140.9 138.2 132.4 125.3 121.3
53.6 142.6 141.4 139.6 134.9 128.8 124.8
59.0 142.6 141.6 140.5 137.6 133.3 129.4
68.0 142.6 141.6 140.7 139.5 137.7 134.7
77.0 142.6 141.6 140.7 139.7 138.8 137.0
86.0 142.6 141.6 140.7 139.7 138.8 137.2
GAHP-W CHILLING CAPACITY - kBtu/hr
HOT WATER INLET TEMPERATURE
77.0 86.0 95.0 104.0 113.0 113.0
CHILLED
WATER INLET
TEMPERATURE DT=18 DT=36
46.4 63.7 61.2 56.7 51.7 46.0 42.5
50.0 64.1 62.2 58.9 54.8 49.9 46.0
53.6 64.2 62.9 60.6 57.4 53.3 49.0
59.0 64.3 63.6 62.4 60.4 57.1 52.9
68.0 64.3 64.0 63.5 62.4 60.6 57.9
77.0 64.3 64.0 63.5 62.4 61.6 60.1
86.0 64.3 64.0 63.5 62.4 61.7 60.0

GAHP-W – Installation, start-up, use and maintenance manual
10 Edition: 2014-08
GAHP-W LB – HEATING AND CHILLING CAPACITIES
Table 5 - GAHP-W LB heating capacity. DT is the difference between outlet and inlet temperature.
Table 6 - GAHP-W LB chilling capacity. DT is the difference between outlet and inlet temperature.
GAHP-W and GAHP-W LB PRESSURE DROP
GAHP-W, GAHP-W LB - Heating mode ∆P
Outlet water temperature
Hot water flow 86.0 °F 104.0 °F 122.0 °F
GPM P
ft of Head
P
ft of Head
P
ft of Head
6.60 3.29 3.14 2.91
7.71 4.17 3.98 3.71
8.81 5.28 5.02 4.70
9.91 6.60 6.25 5.89
11.01 8.12 7.67 7.25
12.11 9.83 9.25 8.79
13.21 11.72 11.00 10.47
14.31 13.77 12.90 12.31
15.41 15.97 14.94 14.27
16.51 18.30 17.11 16.36
17.61 20.76 19.41 18.56
18.71 23.32 21.81 20.86
19.81 25.98 24.32 23.25
20.91 28.73 26.92 25.71
22.01 31.55 29.60 28.24
Table 7 - GAHP-W, GAHP-W LB pressure drop – heating mode.
GAHP-W LB HEATING CAPACITY - kBtu/hr
HOT WATER INLET TEMPERATURE
77.0 86.0 95.0 104.0 113.0 113.0
CHILLED
WATER INLET
TEMPERATURE DT=18 DT=27
32 132.7 129.7 125.2 119.4 112.0 112.0
41 133.7 131.7 129.0 124.6 117.5 117.5
50 133.8 133.1 131.3 128.4 122.8 122.8
59 133.8 133.7 132.6 131.0 127.4 127.4
68 133.8 133.8 133.2 132.4 130.7 130.7
77 133.8 133.8 133.5 132.9 132.5 132.5
GAHP-W LB CHILLING CAPACITY - kBtu/hr
HOT WATER INLET TEMPERATURE
77.0 86.0 95.0 104.0 113.0 113.0
CHILLED
WATER INLET
TEMPERATURE DT=18 DT=27
32 55.9 53.9 50.5 46.1 37.6 37.6
41 57.4 56.0 53.5 49.8 43.1 43.1
50 58.2 57.3 55.8 53.3 48.0 48.0
59 58.4 58.0 57.1 55.6 52.0 52.0
68 58.4 58.1 57.5 56.6 54.8 54.8
77 58.4 58.1 57.5 56.7 56.0 56.0

Overview and technical specifacions
Ed. 2014-08 11
GAHP-W - Chilling mode ∆P
Outlet water temperature
Hot water flow 37.4 °F 46.4 °F 55.4 °F
GPM P
ft of Head
P
ft of Head
P
ft of Head
6.60 4.26 3.98 3.88
7.71 5.34 5.12 4.93
8.81 6.70 6.50 6.22
9.91 8.35 8.11 7.73
11.01 10.25 9.94 9.47
12.11 12.40 11.99 11.42
13.21 14.78 14.23 13.56
14.31 17.37 16.66 15.89
15.41 20.15 19.27 18.39
16.51 23.11 22.06 21.06
17.61 26.23 25.01 23.88
18.71 29.49 28.11 26.85
19.81 32.88 31.35 29.94
20.91 36.38 34.72 33.16
22.01 39.97 38.22 36.48
Table 8 - GAHP-W pressure drop – chilling mode.
GAHP-W LB - Chilling mode ∆P
Outlet water temperature
Hot water flow 23.0 °F 32 °F 41.0 °F
GPM P
ft of Head
P
ft of Head
P
ft of Head
6.60 6.36 5.36 4.66
7.71 8.37 7.03 6.12
8.81 10.72 9.04 7.87
9.91 12.73 11.05 9.61
11.01 15.40 13.40 11.65
12.11 17.75 15.74 13.69
13.21 20.43 18.42 16.02
14.31 23.11 20.76 18.06
15.41 26.12 23.44 20.39
16.51 29.13 26.12 22.73
17.61 32.15 28.80 25.06
Table 9 - GAHP-W LB pressure drop – chilling mode.
Graph 1 - GAHP-W, GAHP-W LB pressure drop – heating mode (see on page 62).
WATER FLOW - GPM
GAHP-W
,
GAHP-W LB PRESSURE DROP
–
HEATING MODE
∆P
–
FEET OF HEAD
3.00
9.00
15.00
21.00
27.00
33.00
6.00 9.00 12.00 15.00 18.00 21.00
86.0 °F Outlet
104.0 °F Outlet
122.0 °F Outlet

GAHP-W – Installation, start-up, use and maintenance manual
12 Edition: 2014-08
Graph 2 - GAHP-W pressure drop – chilling mode (see on page 62).
Graph 3 - GAHP-W LB pressure drop – chilling mode (see on page 62).
2.2 CODES
The equipment shall be installed in accordance with those installation regulations in force
in the local area where the installation is to be made. These regulations shall be carefully
followed in all cases. The local building authority must be consulted before installations
are made. In the absence of such requirements, the installation shall conform:
- In the United States to the latest edition of the National Fuel Gas Code, ANSI
Z223.1/NFPA54 and/or applicable local codes.
- In Canada to the latest edition of the Natural Gas and Propane Installation Code, CSA
B149.1, CSA B149.2 and/or applicable local codes.
All electrical wiring is to be done in accordance with:
- In the U.S., the "National Electrical Code" (NEC), ANSI/NFPA 70, latest Edition
and all applicable local codes as required.
- In Canada, the “Canadian Electrical Code – Part 1”, CSA STD. C22.1 and all
applicable local codes as required.
This appliance must be electrically grounded in accordance with the applicable codes and
standards referenced above.
4.00
10.00
16.00
22.00
28.00
6.00 9.00 12.00 15.00 18.00
23.0°F Outle
t
32.0°F Outle
t
41.0°F Outle
t
WATER FLOW - GPM
GAHP-W LB PRESSURE DROP
–
CHILLING MODE
∆P
–
FEET OF HEAD
WATER FLOW - GPM
GAHP-W PRESSURE DROP
–
CHILLING MODE
∆P
–
FEET OF HEAD
3.00
9.00
15.00
21.00
27.00
33.00
39.00
6.00 9.00 12.00 15.00 18.00 21.00
37.4°F Outle
t
46.4°F Outle
t
55.4°F Outle
t

Overview and technical specifacions
Ed. 2014-08 13
2.3 LOCATION OF THE APPLIANCE
Make sure the GAHP heat pump does not have any transport damage. Check:
- the packaging
- the unit panels
Immediately upon delivery advise the carrier of any shortages or damage.
Packing items (plastic bags, polystyrene foam, nails, etc.) must be kept out of the
reach of children, as they are potentially dangerous.
Before installing the appliance, carefully read the “Warning” information on page 3.
The unit is designed for indoor use only.
The unit must not be installed outdoors. The unit must not be exposed to rain.
The unit must be installed in a ventilated location and in compliance with local and
national regulations.
A shut-off valve must be placed on the gas supply circuit.
Antivibration connections must be placed on the water connections to prevent
vibration transmission.
The appliance should be located to provide required clearances on all sides for
maintenance and inspection.
It should not be located in an area where leakage of any connections will result in damage
to the area adjacent to the appliance or to lower floors of the structure.
When such a location is not available, it is recommended that a suitable drain pan, be
installed under the appliance.
The appliance is design certified by CSAInternational for installation on combustible
flooring; in basements; in closets, utility rooms or alcoves.
GAHP-W and GAHP-W LB units must never be installed on carpeting, tile or other
combustible material other than wood flooring.
DO NOT install this appliance in any location where gasoline or flammable vapors are
likely to be present.
The location for the appliance should be chosen with regard to the vent pipe lengths and
external plumbing.
The unit shall be installed such that the gas ignition system components are protected
from water during operation and service.
When vented vertically, the GAHP-W and GAHP-W LB units must be located as close as
practical to a chimney or outside wall. If the vent terminal and/or combustion air terminal
terminate through a wall, and there is potential for snow accumulation in the local area,
both terminals should be installed at an appropriate level above grade such that blockage
of the terminal from accumulated debris or precipitation is prevented.
This product must be installed and serviced by a qualified installer.

GAHP-W – Installation, start-up, use and maintenance manual
14 Edition: 2014-08
2.4 GAHP-W AND GAHP-W LB DIMENSIONS
Figure 1 – GAHP-W and GAHP-W LB external dimensions.
15-1
2" (*)
60-1
2"
10-1
2"
37-13
16"3-1
8"
33"
25-3
4"24-11
16"
7-13
16"
51- 9
16"
4"
27-3
8" (*)
50-3
4"
33-1
2"
LEGEND A – GAS INLET Ø 1/2FPT
B – ELECTRICAL KNOCKOUT Ø 7/8FPT
A
B

Overview and technical specifacions
Ed. 2014-08 15
Figure 2 – GAHP-W and GAHP-W LB connection dimensions.
2.5 PLACING OF THE APPLIANCE
Do not remove packaging during handling on the installation site.
Packing must only be removed upon final installation.
If the appliance has to be lifted, pass slings into the openings in the base supports and
use spreader bars to prevent the slings from damaging the casing during handling.
The lifting crane and all accessory devices (braces, cables, bars) must be suitable
sized for the load to be lifted.
See Table 2, on page 8 for the weight and dimension of the appliance.
The manufacturer cannot be held responsible for any damage occurred during the placing
of the appliance.
Place the appliance on a flat and leveled fireproof surface.
The appliance must be installed level.
A
B
C D
E
8"
20"
19-1
2"
31-1
2"
7"
11"
LEGEND
A – CHILLED WATER INLET Ø 1” ¼ FPT
B – HOT WATER INLET Ø 1” ¼ FPT
C – CHILLED WATER OUTLET Ø 1” ¼ FPT
D – HOT WATER OUTLET Ø 1” ¼ FPT
E – SAFETY VALVE CONNECTION

GAHP-W – Installation, start-up, use and maintenance manual
16 Edition: 2014-08
REQUIRED CLEARANCES FROM COMBUSTIBLE MATERIALS AND FOR SERVICE
ACCESS.
Figure 3 - Minimum clearances; single unit installation and multiple unit installation.
31-1
2"
18" 18" 18"
31-1
2"
18" 18"
UNIT FRONT SIDE
UNIT FRONT SIDE UNIT FRONT SIDE
36”
36”

Overview and technical specifacions
Ed. 2014-08 17
2.6 VENTING AND COMBUSTION AIR
As an additional measure of safety, Robur strongly recommends installation of
suitable Carbon Monoxide (CO) detectors in the vicinity of this appliance and in any
adjacent occupied spaces.
Combustion Air
GAHP-W and GAHP-W LB units must have provisions for combustion and ventilation air
in accordance with the applicable sections addressing requirements for air for combustion
and ventilation of the National Fuel Gas Code, ANSI Z223.1.
In Canada, the applicable sections of the Natural Gas and Propane Installation Code
(CSA B149.1) must be followed. In all cases any and all applicable local installation codes
must also be followed.
GAHP-W and GAHP-W LB UNITS MUST receive combustion air from the space in which
it is installed.
The room where the appliance is installed MUST be provided with properly sized
openings to assure adequate combustion air and proper ventilation.
- Air provided directly from out side the building with no duct:
oTwo air openings:
Combustion air opening, with a minimum free area of one square inch per
4,000 Btu/hr input. This opening must be located within 12" of the top of the
enclosure.
Ventilation air opening, with a minimum free area of one square inch per
4,000 Btu/hr input. This opening must be located within 12" of the bottom of
the enclosure.
oOne air opening:
The opening must be sized based on a minimum free area of one square
inch per 3,000 Btu/hr. This opening must be located within 12" of the top of
the enclosure.
Figure 4
- Air taken from the outdoors using a duct to deliver the air to the mechanical room:
Two air openings One air openings

GAHP-W – Installation, start-up, use and maintenance manual
18 Edition: 2014-08
oEach of the two openings should be sized based on a minimum free area of
one square inch per 2000 Btu/hr.
Figure 5
- Air taken from another interior space, each of the two openings specified below should
have a net free area of one square inch for each 1,000 Btu/hr of input, but not less
than 100 square inches.
Figure 6
GAHP-W Input Outside air 2
openings
Outside air 1
openings
Inside air 2
openings
Outside air
through 2 ducts
95,500 Btu/h 24 in^2 32 in^2 96 in^2 48 in^2
Table 10
Outside air openings shall directly open to the outdoors. The above requirements are for
the appliance only, additional gas fired appliances in the mechanical room will require an
increase in the net free area to supply adequate combustion air for all appliances.
Combustion air requirements are based on the latest edition of the National Fuel Gas
Code, ANSI Z223.1, in Canada refer to CSA International CAN/CGA B149.1 or B1 49.2
Installation Code.Check all local code requirements for combustion air.