Baxi LUNA DUO-TEC 1.70 User manual

A
LUNA DUO-TEC 1.70
LUNA DUO-TEC 1.110
en CONDENSING GAS FIRED WALL MOUNTED COMBINATION BOILER
Installation and Service Manual
fr CHAUDIÈRE MURALE À GAZ À CONDENSATION À DEUX SERVICES
Installateur et service manuel

7703477.01 (1-03/18)
2
INSTALLER Section (en)
CONTENTS
SAFETY INFORMATION ..............................................................................................................................................................................3
DEFINITIONS ...............................................................................................................................................................................................3
SPECIAL ATTENTION BOXES.....................................................................................................................................................................3
OTHER DEFINITIONS..................................................................................................................................................................................3
BEFORE INSTALLING AND WHILE SERVICING THE BOILER..................................................................................................................4
DURING BOILER OPERATION....................................................................................................................................................................4
BOILER WATER ...........................................................................................................................................................................................4
FREEZE PROTECTION FLUIDS..................................................................................................................................................................5
HEATING APPLIANCE REMOVAL FROM A COMMON VENT SYSTEM.....................................................................................................5
CONDENSATE REMOVAL SYSTEM............................................................................................................................................................5
1. INTRODUCTION...........................................................................................................................................................................................6
2. TECHNICAL DATA........................................................................................................................................................................................6
2.1 PERFORMANCE ..........................................................................................................................................................................................6
2.2 PARAMETER SETTINGS FOR HIGH ALTITUDE.........................................................................................................................................7
2.3 SYSTEM .......................................................................................................................................................................................................7
2.4 MAIN COMPONENTS ..................................................................................................................................................................................8
2.5 GENERAL INSTALLATION INFORMATION .................................................................................................................................................8
2.6 ELECTRICAL................................................................................................................................................................................................9
2.7 AVAILABLE PUMP HEAD FOR CENTRAL HEATING ..................................................................................................................................9
2.8 BOILER SCHEMATIC ...................................................................................................................................................................................10
3. GENERAL BOILER INFORMATION .............................................................................................................................................................12
SERVICE CLEARANCES .............................................................................................................................................................................12
3.1 SELECTING THE BOILER LOCATION ........................................................................................................................................................13
3.2 POSITIONING THE BOILER ........................................................................................................................................................................13
3.3 FIT THE BOILER...........................................................................................................................................................................................13
3.4 FLUSHING THE SYSTEM ............................................................................................................................................................................13
3.5 GAS SUPPLY................................................................................................................................................................................................14
3.6 ELECTRICAL SUPPLY .................................................................................................................................................................................14
3.7 AIR SUPPLY .................................................................................................................................................................................................14
3.8 FROST PROTECTION MODE......................................................................................................................................................................14
3.9 CEASE PROTECTION .................................................................................................................................................................................14
3.10 GAS PIPING .................................................................................................................................................................................................14
4. VENT SYSTEM.............................................................................................................................................................................................15
INSTALLING EXHAUST VENT AND INTAKE AIR VENT..............................................................................................................................15
4.1 VENTING INSTRUCTIONS ..........................................................................................................................................................................16
CONCENTRIC VENT SUPPORT .................................................................................................................................................................17
FLUE OPTIONS............................................................................................................................................................................................17
CONCENTRIC VENT SCREW PLACEMENT ..............................................................................................................................................18
SEPARATED HORIZONTAL FLUE TERMINATION INSTALLATION OPTIONS ..........................................................................................19
BAXI SINGLE PIPE POLYPROPYLENE SYSTEM (POWER VENTING).....................................................................................................19
SEPARATED FLUE TERMINATIONS...........................................................................................................................................................20
TWO PIPE VENT SUPPORT........................................................................................................................................................................20
DUAL FLUE MINIMUM TERMINATION DISTANCES...................................................................................................................................21
5. BOILER LOCATION......................................................................................................................................................................................22
6. CENTRAL HEATING SYSTEM.....................................................................................................................................................................23
6.1 FILLING THE SYSTEM.................................................................................................................................................................................23
6.2 FILLING THE CONDENSATE TRAP ............................................................................................................................................................23
6.3 FILLING THE HEATING SYSTEM................................................................................................................................................................24
7. TOXIC CHEMICALS .....................................................................................................................................................................................24
8. HEATING SYSTEM AND REFRIGERATION................................................................................................................................................25
9. INSTALLATION .............................................................................................................................................................................................25
9.1 CONNECT THE PIPEWORK ........................................................................................................................................................................25
10. ELECTRICAL CONNECTIONS.....................................................................................................................................................................26
10.1 ACCESS TO THE CONNECTION BLOCK ...................................................................................................................................................26
10.2 ACCESSORIES ............................................................................................................................................................................................27
10.3 FROST PROTECTION..................................................................................................................................................................................28
10.4 DHW INDIRECT WATER HEATER...............................................................................................................................................................28
10.5 SHUTDOWN INPUT .....................................................................................................................................................................................29
10.6 RELEASE INPUT..........................................................................................................................................................................................29
10.7 OPTIONAL ELECTRICAL CONNECTIONS..................................................................................................................................................29
10.8 EXAMPLES OF HYDRONIC CIRCUITS WITH AUXILIARY CONTROL BOARD.........................................................................................32
10.9 WIRING DIAGRAMS.....................................................................................................................................................................................33
11. COMMISSIONING ........................................................................................................................................................................................35
11.1 CONTROL PANEL ........................................................................................................................................................................................35
11.2 BEFORE COMMISSIONING ........................................................................................................................................................................36
11.3 COMMISSIONING SETUP ...........................................................................................................................................................................36
11.4 PARAMETERS SETTINGS...........................................................................................................................................................................39
11.5 READING MEASURED VALUES..................................................................................................................................................................43
11.6 STATUS AND SUB-STATUS.........................................................................................................................................................................44
11.7 RETURN TO THE FACTORY SETTINGS ....................................................................................................................................................45
12. TROUBLESHOOTING..................................................................................................................................................................................45
12.1 SHOUTDOWNS AND LOCK-OUTS .............................................................................................................................................................47
12.2 ERROR HISTORY ........................................................................................................................................................................................50
13. MAINTENANCE............................................................................................................................................................................................51
13.1 ROUTINE SERVICING .................................................................................................................................................................................51
IMPORTANT NOTES PRIOR TO SERVICING.............................................................................................................................................51
13.2 COMPONENT REPLACEMENT AND PERIODIC CLEANING.....................................................................................................................51
14. DISMANTLING, DISPOSAL AND RECYCLING ...........................................................................................................................................53

3
INSTALLER Section (en)
7703477.01 (1-03/18)
Licensed Qualied Installer / Service Technician
Read all instructions in this manual, and the Boiler Venting section, before installing, servicing or performing maintenance. Ensure
all steps are performed in the order given.
User
This manual is only to be used by a licensed qualied heating installer/service technician.
Refer to User's Guide for any instructions you may require.
Have this boiler serviced/inspected by a Licensed qualied service technician annually.
After commissioning make sure you are advised, and demonstrated if necessary, of all important points as described in section 2:
"OPERATING THE BOILER” of the User's Guide.
SAFETY INFORMATION
DEFINITIONS
The following dened terms are used throughout this manual to bring attention to the presence of hazards at various risk levels,
or to important information concerning the product.
SPECIAL ATTENTION BOXES
DANGER
"DANGER" indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
WARNING
"WARNING" indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. If
the information in this manual is not followed exactly, a re or explosion may result causing property damage, personal
injury or loss of life.
CAUTION
"CAUTION" indicates a potentially damaging situation which, if not avoided, could result in minor injuries and
substantial product or property damage.
NOTICE
"NOTICE" indicates recommendations made by BAXI for the installers which help to ensure optimum operation and
longevity of the equipment.
OTHER DEFINITIONS
Licensed Qualied Installer / Service Technician - any individual, rm, corporation or company that either directly or through
a representative is engaged in the installation, replacement, repair or servicing of gas piping, venting systems, appliances,
components, accessories, or equipment, and whose representative is experienced and trained, in such work and has complied
with the requirements of the authority having jurisdiction.
STATE/FEDERAL REGULATIONS PERMIT THE INSTALLATION OF THIS PRODUCT ONLY BY AUTHORIZED GAS
CONTRACTORS. HOWEVER, BAXI ADVISES THAT ONLY CONTRACTORS TRAINED IN THE SPECIFIC DETAILS OF THIS
BAXI PRODUCT MUST UNDERTAKE INSTALLATION.
Service - the supply, installation, or maintenance of goods carried out by a Qualied Installer / Service Technician.
Gas Supplier - A party that sells the commodity of Natural Gas (Gas A) or Liquid Propane Gas (Gas E).
Domestic - Relating to household usage as opposed to commercial usage.
Domestic Water - Potable drinking water (tap water).
Combustion - The act or process of burning; a process wherein a fuel is combined with oxygen, usually at high temperature,
producing heat.
Combustion Air - Air that is drawn into an appliance to mix with fuel and support combustion.
Flue - an enclosed passageway for conveying combustion gases.
Calibrate - make ne adjustments or divide into marked intervals for optimal measuring.
Appliance - a device to convert gas into energy; the term includes any component, control, wiring, piping or tubing required to be
part of the device.
Boiler - an appliance intended to supply hot liquid for space-heating, processing or power purposes.
Two Pipe System - This type of venting allows for exhaust ue and intake air piping to be separated from each other. Fresh air
may be drawn in at a different area from where the ue terminal is located.

7703477.01 (1-03/18)
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INSTALLER Section (en)
WARNING
Failure to comply with these denitions could result in severe personal injury, death or substantial property damage.
Failure to adhere to these guidelines could result in severe personal injury, death or substantial property damage.
WARNING
If the information in these instructions is not followed exactly, a re or explosion may result causing property damage,
personal injury or death.
Do not store or use gasoline or other ammable 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 appliances.
• Do not touch any electrical switches; do not use any phones in your building.
• Immediately call your gas supplier or your licensed qualied service technician from a neighbor's phone. Follow the
gas supplier's or licensed qualied personnel's instructions.
• If you cannot reach your gas supplier or your licensed qualied service technician, call the re department.
Baxi recommends the use of a carbon monoxide detector in conjunction with the Baxi boiler product line. When
installing a carbon monoxide detector, the manufacturer’s instructions of the carbon monoxide detector must be
followed in their entirety. It is recommended to use a carbon monoxide detector in compliance with a nationally
recognised standard such as ANSI/UL 2034-2002 in the United States and CSA 6.19-01 in Canada.
WARNING
Installation and service must be performed by a gas supplier or a licensed qualied installer / service Technician. If
overheating occurs or the gas supply fails to shut off, do not turn off or disconnect the electrical supply to the pump.
Instead, shut off the gas supply at a location external to the appliance". Do not use this boiler if any part has been
under water. Immediately call a qualied service technician to inspect the boiler and to replace any part of the control
system or gas control which has been under water.
BEFORE INSTALLING AND WHILE SERVICING THE BOILER
• To avoid electric shock, disconnect the electrical supply before performing maintenance.
• To avoid severe burns, allow the boiler to cool before performing maintenance.
DURING BOILER OPERATION
• Do not block the combustion exhaust ue or intake air to the boiler.
• If overheating occurs or the gas supply fails to shut off, do not turn off or disconnect the electrical supply to the pump. Instead,
shut off the gas supply at a location external to the appliance.
• Do not use this boiler if any part has been under water. Immediately call a qualied service technician to inspect the boiler and
to replace any part of the control system or gas control that has been under water.
BOILER WATER
• If you have an old system with cast iron radiators, thoroughly ush the system, without boiler connected, to remove sediment.
The high-efciency heat exchanger can be damaged by build-up or corrosion caused by sediment.
• Do not use petroleum-based cleaning or sealing compounds in the boiler system, they can damage system gaskets and seals;
resulting in substantial property damage..
• Do not use "homemade cures" or "boiler patent medicines". These may result in substantial damage to the property, the boiler,
and / or serious personal injury.
• Continual fresh make-up water (i.e. auto-feed) will reduce the life of the boiler. Mineral build up in heat exchanger reduces
heat transfer, overheats the stainless steel heat exchanger, and causes premature failure. The addition of oxygen carried in by
make-up water can cause system components to internally corrode. Leaks in the boiler or piping must be repaired at once to
prevent make-up water.
• We recommend the use of water treatment additives to prolong the life of the boiler and prevent against corrosion and
contaminant build-ups in the heating system.
• Ensure piping in the heating system has an oxygen barrier.

5
INSTALLER Section (en)
7703477.01 (1-03/18)
FREEZE PROTECTION FLUIDS
CAUTION
Never use automotive or standard glycol antifreeze, or even ethylene glycol made for hydronic systems. Use only
inhibited propylene glycol solutions, which are specically formulated for hydronic systems. Ethylene glycol is toxic
and can attack gaskets or seals used in hydronic systems. Ensure that the glycol used never exceeds 35% of the
systems volume as this may damage the systems components.
Consider piping and installation when determining a location for the boiler. Any claims for damage or shortage in a
shipment must be led immediately against the transportation company by the consignee.
HEATING APPLIANCE REMOVAL FROM A COMMON VENT SYSTEM
When removing an existing heating appliance, the steps below shall be followed. During this procedure each appliance remaining
connected to the common vent system shall be placed in operation while the other appliances, remaining connected to the
common vent system, are in standby.
• Seal any unused openings in the common vent system.
• Visually inspect the venting system for proper size and horizontal pitch to determine if there is blockage, leakage, corrosion or
other deciencies that could cause an unsafe condition.
• If possible, close all building doors, windows and doors between the space in which the appliance remains connected to
the common vent system and other spaces in the building. Turn on clothes dryers and any appliances not connected to the
common vent system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, at maximum speed. Do not
operate a summer exhaust fan. Close all replace dampers.
• Place in operation the appliance being inspected. Follow the lighting instructions. Adjust the thermostat so the appliance will
operate continuously.
• Test for spillage at the draft hood relief opening 5 minutes after main burner operation using a match or candle ame.
• After determining each appliance remaining connected to common venting system properly vents when tested as outlined,
return doors, windows, exhaust fans, replace dampers and any other gas burning appliance to their previous condition of use.
• Any improper operation of the common vent system must be corrected so the installation conforms to the National Fuel Gas
Code, ANSI Z223.1.
When resizing any portion of the common vent system, the common vent system must be resized to approach the minimum size
as determined using the appropriate tables in Appendix G in the National Fuel Gas Code, ANSI Z 223.1.
WARNING
Verify proper operation after servicing.
CONDENSATE REMOVAL SYSTEM
This vent is to be used on a efciency condensing appliance; therefore this venting has a condensate removal system. Condensate
is nothing more than water vapor, derived from the combustion products. It is very important that the condensate line is sloped
away from the vent and down to a suitable inside drain. A condensate lter, if required by local authorities can be made up of lime
crystals; marble or phosphate chips that will neutralize the condensate. This can be done in the eld by the installer. It is also very
important that the condensate line is not exposed to freezing temperatures, or any other type of blockage. Plastic tubing must be
the only material used for the condensate line. Steel, brass, copper or others will be subject to corrosion or deterioration. A second
vent may be necessary to prevent condensate line vacuum lock if a long horizontal run is used. Also, an increase in pipe size may
be necessary to drain properly. Support of the condensation line may be necessary to avoid blockage of the condensate ow.
CAUTION
The condensate line must remain unobstructed, allowing free ow of condensate. If condensate is allowed to freeze in
the line or if the line is obstructed in any other manner, condensate can exit from the boiler condensate trap, resulting
in potential water damage to property.
Note:
Use materials approved by the authority having jurisdiction. In the absence of an authority, PVC and CPVC pipe must comply with
ASTMD1785, F441 or D2665. Cement and primer must comply with ASTM D2564 or F493. For Canada, use CSA or ULC certied
PVC or CPVC pipe, ttings and cement. When installing a condensate pump, select one approved for use with condensing boilers
and furnaces. The pump should have an overow switch to prevent property damage from condensate spillage. Condensate from
the boiler will be slightly acidic (typically with a pH from 3.0 to 4.0). Install a neutralizing lter if required by local codes.

7703477.01 (1-03/18)
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INSTALLER Section (en)
1. INTRODUCTION
The Luna DUO-TEC 1.70 and Luna DUO-TEC 1.110 are room-sealed, fan assisted, wall-hung, heat only condensing boilers.
The boilers are designed for use with a fully pumped, sealed and pressurized heating system.
The boilers are supplied with a pump, pressure relief valve and pressure gauge fully assembled and tested.
The maximum output available for central heating is 216,329.68 btu/h (63.40 kW) with a temperature rise of 70°F/39°C for the
DUO-TEC 1.70 model and 348,038.28 btu/h (102.00 kW) with a temperature rise of 70°F/39°C for the DUO-TEC 1.110 model.
WARNING
The law states that all gas appliances are installed by a competent person. It is your responsibility to comply with the
law to ensure a safe and proper installation.
• In the United States, the installation must conform to the requirements of the authority having jurisdiction or, in the absence of
such requirements, to the National Fuel Gas Code, ANSI Z223.1/NFPA 54. Where required by the authority having jurisdiction,
the installation must conform to the Standard for Controls and Safety Devices for Automatically Fired Boilers, ANSI/ASME
CSD-1. Safe lighting and other performance criteria were met regarding the gas manifold and control assembly provided on
the boiler when the boiler underwent tests specied in ANSI Z21.13-latest edition.
• In Canada, the installation must conform with CGA B149.1 Natural Gas and Propane Installation code and/or the local
installation code, plumbing or waste water codes and other codes as applicable.
• Ensure the boiler clearances to combustibles are adhered to and combustible material is protected properly.
• Manufacturer's instructions must NOT be taken in anyway as over-riding statutory obligations.
2. TECHNICAL DATA
2.1 PERFORMANCE
LUNA DUO-TEC 1.110
Central Heating
MAX
MIN
0-2,000 Ft
0-610 m
2,000-4,500 Ft
610-1,370 m
Heat Input (Gross) Btu/h 379,127 360,170 39,050
kW 111.11 105.56 11.44
Heat Output (modulating) Btu/h 348,038 330,978 36,885
kW 102 97 10.8
Gas Rate A (Natural Gas) ft3/h 377.34 360.42 39.11
m3/h 10.69 10.21 1.11
Gas Rate E (LPG Gas) ft3/h 149.16 139.80 15.86
m3/h 4.22 3.96 0.45
Max. CH Water Temp. (Approx.) °F 176
°C 80
LUNA DUO-TEC 1.70
Central Heating
MAX
MIN
0-2,000 Ft
0-610 m
2,000-4,500 Ft
610-1,370 m
Heat Input (Gross) Btu/h 240,897 228,613 35,827
kW 70.6 67.0 10.5
Heat Output (modulating) Btu/h 216,330 205,411 32,074
kW 63.4 60.2 9.4
Gas Rate A (Natural Gas) ft3/h 242.59 228.22 35.90
m3/h 6.87 6.46 1.01
Gas Rate E (LPG Gas) ft3/h 95.04 90.00 13.50
m3/h 2.69 2.55 0.38
Max. CH Water Temp. (Approx.) °F 176
°C 80
Gas type Supply pressure (operating)
Min Max
Gas Rate A (Natural Gas) 3.5 in w.c. / 8.7 mbar 10.5 in w.c / 26.0 mbar
Gas Rate E (LPG Gas) 8.0 in w.c. / 20.0 mbar 13 in w.c / 32.4 mbar

7
INSTALLER Section (en)
7703477.01 (1-03/18)
2.2 PARAMETER SETTINGS FOR HIGH ALTITUDE
LUNA DUO-TEC 1.70
Natural gas (A)
17.4 mbar
7.0 in w.c.
LP gas (E)
27.4 mbar
11.0 in w.c.
0 - 2000 Ft
0 - 610 m
2000 - 4500 Ft
610 – 1370 m
0 - 2000 Ft
0 - 610 m
2000 - 4500 Ft
610 – 1370 m
Fan Speed max (rpm)
P17* - P18* 6400 6100 6100 5800
Fan Speed min (rpm)
P19* 1600 1600
CO Limit (ppm) <400
LUNA DUO-TEC 1.110
Natural gas (A)
17.4 mbar
7.0 in w.c.
LP gas (E)
27.4 mbar
11.0 in w.c.
0 - 2000 Ft
0 - 610 m
2000 - 4500 Ft
610 – 1370 m
0 - 2000 Ft
0 - 610 m
2000 - 4500 Ft
610 – 1370 m
Fan Speed max (rpm)
P17* - P18* 7300 7000 7100 6800
Fan Speed min (rpm)
P19* 1200 1200
CO Limit (ppm) <400
Fan speed ignition (P21*) = 3000 rpm
* To modify the fan speeds see section 11.4 PARAMETER SETTINGS
NOTICE
Above 2000 ft (610 m), the boiler will derate by 4% for each 1000 ft (305 m) of altitude gain.
2.3 SYSTEM
LUNA DUO-TEC 1.70
Central Heating (Sealed System)
Max System Pressure 50.00 psi / 3.44 bar
Min System Pressure 7.25 psi / 0.50 bar
Max System temperature 176°F / 80°C
Pressure Relief Valve Setting 50.00 psi / 3.44 bar
Supply Connection 1” /32.2 mm
Return Connection 1” /32.2 mm
Pressure Relief Valve Connection 3/4” /22.2 mm
Recommended System Pressure (cold) 21.7 psi / 1.5 bar
LUNA DUO-TEC 1.110
Central Heating (Sealed System)
Max System Pressure 50.00 psi / 3.44 bar
Min System Pressure 7.25 psi / 0.50 bar
Max System temperature 176°F / 80°C
Pressure Relief Valve Setting 50.00 psi / 3.44 bar
Supply Connection 1 1/2” / 48.3 mm
Return Connection 1 1/2” / 48.3 mm
Pressure Relief Valve Connection 3/4” / 22.2 mm
Recommended System Pressure (cold) 21.7 psi / 1.5 bar

7703477.01 (1-03/18)
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INSTALLER Section (en)
2.4 MAIN COMPONENTS
LUNA DUO-TEC 1.70
Burner Stainless Steel
Main Heat exchanger Stainless Steel
Pump Grundfos UPER 25-78
Fan EBM PAPST NGR 137/2400
Gas Valve SIT 848 SIGMA
Low Water Cutoff ELBI 784
LUNA DUO-TEC 1.110
Burner Stainless Steel
Main Heat exchanger Stainless Steel
Pump Grundfos UP 26-96 F
Fan EBM PAPST RG 148/1200
Gas Valve SIT 848 SIGMA
Low Water Cutoff ELBI 784
2.5 GENERAL INSTALLATION INFORMATION
LUNA DUO-TEC 1.70
Dimensions
Height 30 1/16" / 763 mm
Width 17 3/4" / 450 mm
Depth 23" / 585 mm
Gas Connection 3/4”
Primary Water Content 0.79 US gal / 3.60 l
Concentric ue pipe diameter 3 3/16" / 80 mm
Concentric air pipe diameter 4 15/16" / 125 mm
Dual ue vent pipe diameter 3 3/16" / 80 mm
LUNA DUO-TEC 1.110
Dimensions
Height 37 7/16" / 951 mm
Width 23 5/8" / 600 mm
Depth 25 3/8" / 644 mm
Gas Connection 1 ”
Primary Water Content 4.62 US gal / 21.0 l
Concentric ue pipe diameter 4 3/8" / 110 mm
Concentric air pipe diameter 6 5/16" / 160 mm
Dual ue vent pipe diameter 4 3/8" / 110 mm
LUNA DUO-TEC 1.70
Minimum Service Clearances
Top11 13/16" / 300 mm
Bottom 9 7/8" / 250 mm
Sides 1 3/4" / 45 mm
Front 17 3/4" / 450 mm
Flue Terminal Size Concentric System 4 15/16" / 125 mm
Flue Terminal Size 2-Pipe Flue System 3 3/16" / 80 mm
Flue Terminal Protruding 4 1/2" / 115 mm
Lift Weight 120.15 lb / 54.5 kg
LUNA DUO-TEC 1.110
Minimum Service Clearances
Top15 3/4" / 400 mm
Bottom 11 13/16" / 300 mm
Sides 1 3/4" / 45 mm
Front 17 3/4" / 450 mm
Flue Terminal Size Concentric System 6 5/16" / 160 mm
Flue Terminal Size 2-Pipe Flue System 4 3/8" /110 mm
Flue Terminal Protruding 4 1/2" / 115 mm
Lift Weight 215.6 lb / 98 kg

9
INSTALLER Section (en)
7703477.01 (1-03/18)
2.6 ELECTRICAL
Supply 120 V - 60 Hz
Power Consumption - LUNA DUO-TEC 1.110 376 W
Power Consumption - LUNA DUO-TEC 1.70 183 W
Internal Fuse (N°2) F1=6.3 A / F2=2.0 A
2.7 AVAILABLE PUMP HEAD FOR CENTRAL HEATING
This is a high static head pump t for installation on any type of single or double-pipe heating systems. The automatic air valve
incorporated in the pump allows for quick air purging of the heating system.
QWATER FLOW RATE MIN Minimum speed of modulation
HHEAD MAX Maximum speed of modulation
LUNA DUO-TEC 1.70
6
6.5
7
7.5
8
8.5
9
0 200 400 600 800 1000 1200
H (mH
2
O)
Q (l/h)
20
21
22
23
24
25
26
27
28
29
30
0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50
H (ft w.c.)
Q (gpm)
Min
Max
Max
Min
LUNA DUO-TEC 1.110
0
1
2
3
4
5
6
7
8
9
10
0400 80012001600200024002800320036004000
H (mH2O)
Q (l/h)
4
6
8
10
12
14
16
18
20
22
24
26
28
30
0.00 2.50 5.00 7.50 10.0012.50 15.0
0
H (ft w.c.)
Q (gpm)
CAUTION
It is recommended to design the Heating System to ensure a minimum water ow rate of at least 4.4 gpm (1000 l/h).

7703477.01 (1-03/18)
10
INSTALLER Section (en)
2.8 BOILER SCHEMATIC
• With a demand for heating, the pump circulates water through the primary circuit.
• The combustion fan will then come on and begin to run at ignition speed.
• Once the fan reaches ignition speed the control board will allow power to ow to the spark generator and gas valve creating
ignition in the combustion chamber. The ame sensor will acknowledge the presence of a ame in the combustion chamber
and send a signal to the control board.
• The temperature sensor will send a signal to the control board allowing the control board to increase / decrease the speed of
the fan. The combustion fan will in turn modulate the gas rate accordingly.
• Once the central heating loop temperature exceeds the central heating loop setpoint the unit will shutdown and go through a 3
minute time delay (burner pause time) before another call for heat.
• During this time the pump will run for an additional three minutes to dissipate any residual heat.
7215364
4
3
5
2
1
9
6
11
15
14
18
16
20
19
13
17
10
21
8
12
7214526
4 3 5
8
7
10
11
13
14
15
17
18
16
20
19
21
2 1 6
9
12
22
22
LUNA DUO-TEC 1.70 LUNA DUO-TEC 1.110

11
INSTALLER Section (en)
7703477.01 (1-03/18)
1.70 1.110
1Condensate trap Condensate trap
2Gas valve Gas valve 3Fan Fan 4Air/gas collector Air/gas collector 5Primary exchanger Primary exchanger 6Burner sight glass Burner sight glass 7Manual air vent - 8Flue sensor Flue sensor 9Coaxial ue connector Coaxial ue connector
10 Flue gas test port Flue gas test port
11 Combustion air test port Combustion air test port
12 Exchanger ange high limit Exchanger ange high limit 13 Ignition/Flame detection electrode Ignition/Flame detection electrode 14 Spark generator Spark generator 15 Automatic air vent Automatic air vent 16 Auxiliary control board box Auxiliary control board box 17 Air/gas mixer Air/gas mixer 18 Pump Pump 19 Boiler drain Boiler drain 20 Pressure gauge Pressure gauge 21 Low water cutoff Low water cutoff 22 Thermal fuse Thermal fuse (rear)
ACondensate trap drain Condensate trap drain
BGas inlet connection Gas inlet connection CHeating supply connection Heating supply connection DHeating return connection Heating return connection

7703477.01 (1-03/18)
12
INSTALLER Section (en)
3. GENERAL BOILER INFORMATION
SERVICE CLEARANCES
BACK
CLOSED INSTALLATION
1 3/4”
(45.00 mm)
TOP VIEW
CLEARANCES REQUIRED FOR
CLOSET INSTALLATION
CLEARANCES FOR
COMBUSTIBLES
1 3/4”
(45.00 mm)
1 3/4”
(45.00 mm)
1 3/4”
(45 mm)
1 3/4”
(45 mm)
11 13/16” in
(300 mm)
9 7/8”
(250 mm)
17 3/4”
(450 mm)
Minimum clearance
from front of boiler
23”
(585 mm)
30”
(763 mm)
Model 1.70 Model 1.110
1 3/4”
(45.00 mm)
1 3/4”
(45.00 mm)
17 3/4”
(450.00 mm)
Model 1.70
Model 1.110
23 5/8”
(600.00 mm)
15 3/4”
(400 mm)
11 13/16”
(300 mm)
25 3/8”
(644 mm)
37 7/16”
(951 mm)
17 3/4”
(450 mm)
Minimum clearance
from front of boiler
0” in /0 mm
between the back of the unit and the wall
1 3/4”
(45 mm)
1 3/4”
(45 mm)

13
INSTALLER Section (en)
7703477.01 (1-03/18)
WARNING
• We recommend that service clearances be considered when locating a suitable area for the unit.
• The boiler must not be installed on carpeting.
• Keep the boiler area clear and free from ammable vapors and liquid.
3.1 SELECTING THE BOILER LOCATION
1. Check the installation area for nearby connections to:
• System water piping
• Venting connections
• Gas supply piping
• Electrical power
2. Inspect the area around the boiler; remove any combustible materials, gasoline and other ammable liquids.
3. Ensure the Boiler's gas control system components are protected from dripping or spraying water.
WARNING
Failure to keep boiler area clear and free of combustible materials, gasoline as well as other ammable liquids and
vapors can result in severe personal injury, death or substantial property damage.
3.2 POSITIONING THE BOILER
• Decide the position of the boiler taking into account the clearances required for servicing and the ue terminal position.
WARNING
Remove any combustible materials, gasoline and other ammable liquids away from the hot water pipes.
• Tape the template to the wall, ensure it is level and upright, and mark the position of the holes for the hanger bolts and plumbing
connections. If rear exit ue is to be used, mark the position of the hole for the ue.
• If the unit will be terminating horizontally, continue to mark the horizontal center line of the ue across the wall to the side wall,
then along the side wall ensuring the lines are level. This will give the position of the centre of the hole for the ue.
• Cut the 5 5/16” / 135.00 mm diameter hole in the wall for the concentric ue for model 1.70 and 6 11/16” / 170.00 mm diameter
hole in the wall for the concentric ue for model 1.110.
3.3 FIT THE BOILER
• Lift the boiler and hang it on the wall.
• Adjust the position of the boiler; ensuring it is level.
3.4 FLUSHING THE SYSTEM
The installation must be cleaned and ushed according to good installation practices. The warranty may become null and void if
the installation is not ushed and/or the water quality is inadequate. It is mandatory to check the water quality of a central heating
installation semi-annually, particularly if it is topped up regularly. If the water has been treated, the supplier of the water treatment
product can be consulted. The user of the installation is responsible for ensuring good water quality at all times. If the user wishes
to achieve this water quality with the aid of a water treatment system, this will also be his/her responsibility.
• You must thoroughly ush the system, without boiler connected, to remove sediment. The high-efciency heat exchanger can
be damaged by build-up or corrosion due to sediment.
Note:
It is recommended that a water treatment product be utilized for sediment removal.
• For zoned systems, ush each zone separately through a purge valve. If purge valves and isolation valves are not already
installed, install them to properly clean the system.
• Flush system until water runs clean and you are sure piping is free of sediment.

7703477.01 (1-03/18)
14
INSTALLER Section (en)
CAUTION
When purging installations that incorporate standing iron radiators and systems with manual vents at high points,
start with the nearest manual air vent, open the vent until water ows out, then close vent. Repeat this procedure,
working your way toward furthest air vent. Install a basket strainer in an older system if large amounts of sediment are
present. Annual cleaning of the strainer may be necessary.
WARNING
Do not use petroleum-based cleaning or sealing compounds in the boiler system. Damage to elastomer seals and
gaskets in system could occur; resulting in substantial property damage. DO NOT ll with softened water; boiler
corrosion can occur.
3.5 GAS SUPPLY
The LUNA DUO-TEC 1.70 requires a gas rate of 242.59 ft3/h (6.87 m3/h) for Natural Gas (Gas A) and 95.04 ft3/h (2.69 m3/h) for
Liquid Propane Gas (Gas E).
The LUNA DUO-TEC 1.110 requires a gas rate of 377.34 ft3/h (10.69 m3/h) for Natural Gas (Gas A) and 149.16 ft3/h (4.22 m3/h)
for Liquid Propane Gas (Gas E).
The meter and supply pipes must be capable of delivering this quantity of gas in addition to the demand from any other appliances
in the house. The Luna DUO-TEC 1.70 requires at least a 3/4” / 19.5 mm gas supply pipe and the Luna DUO-TEC 1.110 requires
at least a 1” / 25.4 mm gas supply pipe.
WARNING
The boiler and its gas line connections must be leak tested before placing the boiler into operation.
3.6 ELECTRICAL SUPPLY
The boiler requires a 120V 60Hz power supply. Ensure the electrical supply is polarized.
The boiler must be grounded and on a dedicated circuit.
There must only be one common isolator, providing complete electrical isolation for the boiler and any external controls.
Using PVC insulated cable 18 AWGx3C 221°F (105 ºC).
All wiring must be installed in accordance with requirements of National Electrical Code and any additional national, state, or local
code requirements having jurisdiction. All wiring must be N.E.C. Class 1. Boiler must be electrically grounded in accordance with
the National Electrical Code, ANSI/NFPA No. 70-latest edition.
In Canada, installation must conform to CSA C22.1 Canadian Electrical Code Part 1 and any local codes.
3.6.1 Install Room Thermostat
Install a room thermostat on an inside wall; never install the thermostat where it will be inuenced by drafts, hot or cold water pipes,
lighting xtures, television, sun rays or near a replace.
3.7 AIR SUPPLY
The boiler does not require any air vents in the room in which it is installed, or when installed in a cupboard or compartment.
3.8 FROST PROTECTION MODE
The frost protection mode is built-in to the appliance and can activate if either the domestic hot water or central heating mode are
on. If the temperature falls below 39.2°F / 4.0° C the boiler will re on its minimum setting until a ow temperature of 86°F / 30° C
is reached.
3.9 CEASE PROTECTION
The pump will automatically operate for 1 minute in every 24 hours to prevent ceasing.
3.10 GAS PIPING
Run the gas supply line in accordance with all applicable codes.
Locate and install the manual shutoff valve before the gas valve as shown in section 3: "GENERAL BOILER INFORMATION", in
accordance with state and local requirements.
WARNING
A sediment trap must be provided upstream of the gas controls.

15
INSTALLER Section (en)
7703477.01 (1-03/18)
4. VENT SYSTEM
GENERAL
• Install the boiler / venting system in accordance with these instructions and with the National Fuel Gas Code, ANSIZ223.1/
NFPA 54, CAN/CSA B149.1, and/or applicable provisions of local building codes.
• This boiler is a direct vent appliance and category IV according to ANSI Z21.13/CSA4.9 standard.
EXHAUST VENT AND INTAKE AIR VENT
The intake and exhaust venting methods are detailed in this manual. Do not attempt to install the Boiler using any other means.
Be sure to locate the boiler such that the air intake and exhaust vent piping can be routed through the building and properly
terminated.
DANGER
Ensure the exhaust and intake vent piping comply with these instructions regarding the vent system. Inspect nished
combustion air intake and exhaust piping thoroughly to ensure all joints are well secured, airtight and comply with all
applicable code requirements, as well as with the instructions provided in this manual. Failure to provide a properly
installed vent system will cause severe personal injury or death.
WARNING
This vent system will operate with a positive pressure in the pipe. Do not connect vent connectors serving appliances
vented by natural draft into any portion of mechanical draft systems operating under positive pressure. Follow the
venting instructions below carefully. Failure to do so may result in severe personal injury, death, or substantial property
damage.
Do not use Foam Core Pipe or Cellular Foam Core Pipe in any portion of the venting from this boiler. Use of Foam Core
Pipe or Cellular Foam Core Pipe may result in severe personal injury, death, or substantial property damage.
• Determine exhaust vent location:
a) Refer to the illustration within this section 4.1.4: Flue Termination Location to determine clearances for the ue termination.
b) Provide a minimum of 1 ft / 0.30 m in the United States and 3.00 ft / 0.92 m in Canada from any door, operable window.
c) Provide a minimum of 1.00 ft / 0.30 m clearance from the bottom of the exhaust above the grade (snow removal may be
necessary to maintain clearance).
d) Provide a horizontal clearance of 3.00 ft / 0.92 m clearance from electrical meters, gas meter regulators and relief equipment.
In no case shall the exit terminal be above or below the aforementioned equipment unless the 3.00 ft / 0.92 m horizontal distance
is maintained unless the exit terminal is a minimum of 15 ft/4.6 m above the aformentioned equipment.
e) Do not locate the exhaust over public walkways where condensate could drip and/or freeze and create a nuisance or hazard.
f) When adjacent to a public walkway, locate exit terminal at least 7 ft / 2.13 m above grade.
g) Do not locate the exhaust directly under roof overhangs to prevent icicles from forming.
h) Provide a 6“ / 152 mm clearance from the inside corner of vertical walls, chimneys, etc., as well as horizontal corners created
by roof overhangs.
• Determine air intake vent location.
a) Provide 1 ft / 0.30 m clearance from the bottom of the intake air vent to the grade.
b) Do not locate the intake air vent in a parking area where machinery may damage the pipe.
c) When venting with a two-pipe system, the minimum distance between exhaust vent and intake air vent on a single boiler is 4
3/4" / 120.00 mm center-to-center.
INSTALLING EXHAUST VENT AND INTAKE AIR VENT
DANGER
Ensure that the ow of combustion and ventilation air are not obstructed.
BAXI urges users to install CO detectors in buildings where the boiler is located, even though such detectors may not
be required by local code. CO detectors should be calibrated regularly as specied by the manufacturer.
Note:
Venting should be supported approximately every 39 3/8" / 1 m. Supports should be xed along the connection point of each pipe.

7703477.01 (1-03/18)
16
INSTALLER Section (en)
4.1 VENTING INSTRUCTIONS
NOTICE
Read carefully the venting instructions contained in this manual and the ones supplied by the vent manufacturer, in
case of discrepancies the venting instruction of this manual must be respected.
4.1.1 Concentric venting
The 90° elbow allows the boiler to connect to the venting termination regardless of direction; since it can be rotated by 360°. It can
also be used to connect the vent with a 45° elbow.
45° elbow 9 13/16" / 0.25 m
90° elbow 19 11/16" / 0.50 m
7222577 7222591
LUNA DUO-TEC 1.70 LUNA DUO-TEC 1.110
600 mm
23 5/8”
644 mm
25 3/8”
112 mm
4 7/16”
354.50 mm
14”
245.50 mm
9 11/16”
223.00 mm
8 3/4”
585 mm
23”
144.5 mm
5 11/16”
17 3/4”
450 mm
140 mm
5 1/2”
225 mm
8 7/8”
225 mm
8 7/8”
• Examine all components for possible shipping damage, prior to installation.
• This venting system must be free to expand and contract.
• The venting system must be supported in accordance with these instructions.
• The vent system must have unrestricted movement through walls, ceilings and roof penetrations.
• Check for proper joint construction when joining pipe to ttings.
• If the vent is penetrating ceilings and oors, the openings must have a means of restopping in joist areas and proper restop
spacer assemblies installed.
• A Baxi roof ashing is available as an accessory. Standard roof ashing methods must be employed to install the roof ashing.
• Wall and roof openings must be framed to provide support and the attachment of termination assemblies.
Please Note:
The manual uses the terms 'vent' , 'venting' and 'ue' interchangeably. All references to 'ue' are synonymous with 'vent' or
'venting'.
WARNING
Ensure a minimum downward slope of 1.97 in / 5.00 cm for every 39 3/8"/ 1.00 m of duct length toward the boiler.
(X)
WT
WT
(X)
7221668
max 13 3/4” (350 mm
)
x
Y
2” (50 mm)
min 5 1/8” (130 mm
)
2°
7221693
WT : Wall Thickness

17
INSTALLER Section (en)
7703477.01 (1-03/18)
WARNING
All concentric venting must be fastened together using screws.
NOTICE
Dual ue venting is not to be fastened with screws; this procedure only pertains to concentric venting.
For horizontal ues a minor deviation from the horizontal is allowable, provided it results in a downward slope towards the boiler.
For the vertical ue termination, refer to the separate installation instructions supplied with the assembly.
Under no circumstances, including allowances for extra elbows, shall the ue length exceed 32' 9 5/8" / 10.00 meters.
• Connect the ue elbow to the top of the boiler and adjust the direction of the elbow to the desired orientation (rear, right or left).
• Measure the distance from the outside wall face to the elbow. This dimension will be known as 'X'.
• add distance "Y" + 2" (5.80 cm) to "X" , this is the total dimension of the vents.
• Mark the above dimension on the outer aluminum intake vent. Measure the length of waste material, and transfer the dimension
to the inner Grey ue pipe.
• Remove the waste from both vents (ue and air). Ensure that the cut ends are square and free from burrs.
• Insert the ue back into the intake air vent and pass them through the hole in the wall
WARNING
• Check all measurements before cutting.
• The clearance to combustible materials is zero when using a concentric vent system.
• After installing the venting make sure that there is no recirculation of combustion by using a regularly calibrated analyzer.
• Ensure a minimum downward slope of 1.97 in / 5.00 cm for every 39 3/8"/ 1.00 m of the ue length toward the boiler.
• Ensure that the termination is positioned with the slots at the bottom.
Concentric Vent Support
All venting must be supported every 39" (1 m) with a xed clamp.
A: steel strapping or equivalent
A
CG_2274
Flue Options
• The boiler can be tted with ue systems as illustrated.
• The standard ue (horizontal termination) is suitable only for horizontal applications.
• Maximum permissible equivalent ue lengths are:
Concentric venting = 32' 9 5/8" / 10.00 m
• Any additional "in line" elbows in the ue system must be taken into consideration.
45° elbow 19 11/16"/ 0.50 m
90° elbow 39 3/8"/ 1.00 m
The rst elbow in a horizontal run is not included in any equivalent length calculations
• The illustrations below show examples of maximum equivalent lengths.
• Installation instructions for ttings are included in each ttings package.

7703477.01 (1-03/18)
18
INSTALLER Section (en)
L MAX
A B 32’ 9 5/8” / 10 m
C D 29’ 6” / 9 m
E F 32’ 9 5/8” / 10 m
G26’ 3” / 8 m
H29’ 6” / 9 m
Concentric Vent Screw Placement
Two screws must be fastened through the outer intake pipe behind the gaskets at equal distances approx. 180º apart. Please note
the screws used must be no larger than No.8 - 1/2 sheet metal screws and must be zinc coated. The length of this screws must
be 0.75 in (19.00 mm). If the screws are not supplied by the vent manufacturer together with the venting products, you have to x
together the pipes using screws with the same characteristic sourced locally in the market.
1 3/4” (45 mm)
1” (25 mm)
3/4” (19 mm)
WARNING
Before securing the screws, ensure the pipe has been pushed in a minimum of 1 3/4" (45 mm) into the gasketed end
of the other pipe.
NOTICE
When connecting vent pipes, use only the silicone grease supplied with the exhaust pipes. The silicone grease should
only be used on the smaller seal of the exhaust pipes. Do not use other types of grease and do not apply it to the large
seal.

19
INSTALLER Section (en)
7703477.01 (1-03/18)
4.1.2 Baxi two pipe Polypropylene system
This type of venting allows for exhaust ue and intake ue to be separated from each other. Fresh air may be drawn in at a different
area from where the ue terminal is located.
The splitting kit consists of a adaptor and of an intake air vent adaptor.
For the air duct adaptor use the screws and seals previously removed from the cap.
The 90° elbow allows the boiler to connect to the venting termination regardless of direction; since it can be rotated by 360°. It can
also be used to connect the vent with a 45° elbow.
45° elbow 9 13/16" / 0.25 m
90° elbow 19 11/16" / 0.50 m
110 mm
7222577
17 3/4”
450 mm
4 5/16”
110 mm
4 5/16”
144 mm
5 11/16”
225 mm
8 7/8”
225 mm
8 7/8”
140 mm
5 1/2
585 mm
23”
144 mm
5 11/16”
BA
644 mm
25 3/8”
600 mm
23 11/16”
354 mm
14
222 mm
8 3/4”
112 mm
4 7/16”
115 mm
4 1/2”
170 mm
6 11/16”
7222591
LUNA DUO-TEC 1.70 LUNA DUO-TEC 1.110
115 mm
4 1/2”
245.50 mm
9 11/16”
Separated horizontal ue termination installation options
The maximum length of the intake vent (L 1) can not exceed 49' 1/4" / 15.00 m for LUNA
DUO-TEC 1.70 and 32' 9 5/8" / 15.00 m for LUNA DUO-TEC 1.110.
• (L1 + L2) max = 147' 5/8" / 45.00 m for LUNA DUO-TEC 1.70
• (L1 + L2) max = 131' 1/4" / 40.00 m for LUNA DUO-TEC 1.110
WARNING
Ensure a minimum downward slope of 1.97 in / 5.00 cm for every 39 3/8"/ 1.00 m of duct length toward the boiler.
Baxi single pipe Polypropylene system (Power Venting)
4 3/8”
(112.00 mm)
25 3/8”
(644.00 mm)
17.72”
(450.00 mm)
5 3/4”
(144.5 mm)
8 7/8”
(225.00 mm)
9 1/2”
(242.50 mm)
8 7/8”
(225.00 mm)
23”
(585.00 mm)
23 5/8”
(600.00 mm)
14”
(354.50 mm)
10”
(245.50 mm)
8.0”
(203.0 mm)
7659663 7659739
LUNA DUO-TEC 1.70 LUNA DUO-TEC 1.110
• L1 = 0
• L2 max = 147' 5/8" / 45.00 m for LUNA DUO-TEC 1.70
• L2 max = 131' 1/4" / 40.00 m for LUNA DUO-TEC 1.110
WARNING
For LUNA DUO-TEC 1.110 remove the gasket as shown in the drawing.
CG_1643

7703477.01 (1-03/18)
20
INSTALLER Section (en)
Separated ue terminations
LUNA DUO-TEC 1.70 LUNA DUO-TEC 1.110
IL max = 32' 3 3/8" / 10 m L max = 32' 3 3/8" / 10 m
LL max = 32' 3 3/8" / 10 m L max = 32' 3 3/8"/ 10 m
ML max = 29' 6" / 9 m L max = 29' 6" / 9 m
Spring Clamp Instructions
Baxi requires the use of the spring clamp at every push-t gasket connection when
using their polypropylene vent. Please follow the instructions below when utilizing
the spring clamps:
• Take the Baxi dual ue spring clamp with the larger hole in it and place it onto the
male end of the pipe.
• Slide clamp all the way down the pipe with the smaller opening of the clamp
towards the female end of the pipe.
• Bend the clamp over the female end of pipe "A" and slide the male end of pipe "B"
through the clamp and into the female end of pipe "A".
NOTICE
This clamp is needed for Baxi dual ue pipe. The dual ue spring clamp is for indoor use only and should not be used
in an outdoor application.
Two Pipe Vent Support
All venting must be supported every 39" (1 m) with a xed clamp.
A: steel strapping or equivalent
A
CG_2274
CG_2130
L
I
L
M
L
L