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Baxi Luna HT Installers And Users Instructions

Wall-mounted condensing boilers
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Wall-mounted condensing boilers
HT
Installer's and User's Instructions
BAXI
, one of the leading European enterprises to produce central heating and hot water devices for domestic use (wall-mounted gas-
S.p.A.
operated boilers, floor-standing boilers, electrical water-heaters and steel heating plates) has obtained the CSQ certificate of conformity to the UNI
EN ISO 9001 norms. This certificate guarantees that the Quality System applied at the BAXI
factory in Bassano del Grappa, where your
S.p.A.
CERTIFICAZIONE DEI SISTEMI
boiler was produced, meets the standards of the UNI EN ISO 9001 norm, which is the strictest and concerns all organization stages and operating
QUALITA' DELLE AZIENDE
UNI EN ISO 9001
personnel involved in the production and distribution processes.

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Summary of Contents for Baxi Luna HT

  • Page 1 CSQ certificate of conformity to the UNI EN ISO 9001 norms. This certificate guarantees that the Quality System applied at the BAXI factory in Bassano del Grappa, where your S.p.A.
  • Page 2 Do not leave any parts of the packaging (plastic bags, polystyrene, etc.) within children’s reach as they are a potential source of danger. BAXI boilers bear the CE mark in compliance with the basic requirements as laid down in the following Directives:...

  • Page 3: Table Of Contents

    Contents Instructions pertaining Instructions prior to installation to the user Instructions prior to commissioning Commissioning of the boiler Filling the boiler Turning off the boiler Prolonged standstill of the system. Frost protection Gas change Servicing instructions General information Instructions pertaining Instructions prior to installation to the installer Boiler installation...

  • Page 4: Instructions Pertaining To The User

    Instructions pertaining to the user 1. Instructions prior to This boiler is designed to heat water at a lower than boiling temperature at atmospheric pressure. The installation boiler must be connected to a central heating system and to a domestic hot water supply system in compliance with its performances and output power.
  • Page 5 Figure 1 KEYS DISPLAY SYMBOLS Operation in domestic hot water mode Domestic hot water on/off key Central heating water temperature setting Operation in central heating mode Domestic hot water temperature setting Operation in automatic mode Operation in manual mode at the Reset key maximum temperature set Operation in manual mode at minimum...
  • Page 6 Dash “Automatic mode” active Figure 2 Automatic operation. Operation of the boiler is controlled by the timed program as described in point 3-5.1 “Daily timed program for operation of the central heating system”; Manual operation at the maximum temperature set. The boiler comes into operation regardless of the timed program set.
  • Page 7 b) press the keys until the display shows P1, referring to the time to be set; c) press the keys to set the time; on the display, the letter P will start to flash; d) press the key to save and exit the programming function; 3-3 –...
  • Page 8 3-7 - Table of user-settable parameters Parameter Parameter description Factory Range setting Time of day setting ———- 0…23:59 Minimum central heating temperature setting (°C) 25..80 Start of first daily period of automatic central heating 6:00 00:00…24:00 End of first daily period of automatic central heating 22:00 00:00…24:00 Start of second daily period of automatic central heating...
  • Page 9 Fault warnings appear on the secondary display (figure 1 b) alternating with the time, both of them flashing (figure 4.1). It is not possible to reset malfunction warnings which appear on the secondary display as the cause of the alarm has first to be removed. Figure 4.1 3.9 Fault warnings table Fault...

  • Page 10: Filling The Boiler

    LUNA HT 280 - HT 330 Boiler drain valve Boiler filling tap Figure 5a LUNA HT 1.120 - HT 1.240 - HT 1.280 Figure 5b Boiler filling tap The boiler is equipped with a hydraulic differential pressure switch that will inhibit the operation of the boiler in the event of the pump seizing or running dry.

  • Page 11: Prolonged Standstill Of The System. Frost Protection

    6. Prolonged standstill of the We recommend you avoid draining the whole system as water replacements engender purposeless system. Frost protection and harmful limestone deposits inside the boiler and on the heating elements. In case the boiler is not operated during wintertime and is therefore exposed to danger of frost we suggest you add some specific-purpose anti-freeze to the water contained in the system (e.g.: propylene glycole coupled with corrosion and scaling inhibitors).

  • Page 12: Instructions Pertaining To The Installer

    Instructions pertaining to the installer 9. General information The following remarks and instructions are addressed to Service Engineers to help them carry out a faultless installation. Instructions regarding lighting and operation of the boiler are contained in the ‘Instructions pertaining to the user’ section. Note that installation, maintenance and operation of the domestic gas appliances must be performed exclusively by qualified personnel in compliance with current standards.

  • Page 13: Boiler Installation

    directions. Remember that the presence of foreign matter in the heating system can adversely affect the operation of the boiler (e.g. overheating and noisy operation of the heat exchanger) Decide upon the boiler location, then tape the template on the wall. 11.

  • Page 14: Fittings Present In The Packaging

    By means of a splitting kit a two-pipe system may also be installed. In case exhaust and intake flues not supplied by BAXI S.p.A. have been installed, these must be certified for the type of use and must have a maximum pressure drop of 100 Pa.
  • Page 15 ° ° Flue duct terminal Max. length Each 90 bend Each 45 bend Flue Outer of flue duct reduces the duct reduces the duct terminal terminal max. length by max. length by diameter diameter Coaxial Ø 60/100 mm 10 m 0,5 m 100 mm 100 mm...
  • Page 16 Vertical flue terminal Ø 60/100 mm installation options This type of installation can be carried out both on a flat or pitched roof by fitting a terminal, an appropriate weathering tile and sleeve, (supplementary fittings supplied on demand). L max = 10 m L max = 10 m L max = 8 m L max = 9 m...
  • Page 17 A 90° bend reduces the total duct length by 0.5 metre. A 45° bend reduces the total duct length by 0.25 metre. Separated horizontal flue terminals installation options IMPORTANT: Ensure a minimum downward slope of 1 cm toward the outside per each metre of duct length Make sure that the exhaust and intake ducts are securely fixed to the walls.

  • Page 18: Connecting The Mains Supply

    Separated vertical flue terminals installation options L max = 14 m L max = 15 m Important: if fitting a single exhaust flue duct, ensure it is adequately insulated (e.g.: with glass wool) wherever the duct passes through building walls. For detailed instructions concerning the installation of fittings refer to the technical data accompanying the fittings.
  • Page 19 15.1 Description of the electrical connections to the boiler Turn the control box downward to access terminal boards M1 and M2 used for the electrical connections by removing the two protective covers (see figure 11). Terminals 1-2: connection of SIEMENS model QAA73 temperature regulator supplied as accessory. Connection polarity is irrelevant.
  • Page 20 Parameter Range Default value Line no. HC1 gradient 2.5…40 Selection of central heating circuit temperature curve “kt” HC1 max. output 25…85 Central heating system maximum output temperature Type of building Light, Heavy Light Room compensation on HC1 Activation/deactivation of the influence of the room on HC2 On HC1 temperature.
  • Page 21 15.3 Connecting the outdoor temperature sensor probe The SIEMENS model QAC34 outdoor temperature sensor probe (optional accessory) must be connected to terminals 7-8 of terminal board M2 in figure 11. The procedures for setting the gradient of the temperature curve “kt” vary depending on the accessories connected to the boiler.
  • Page 22 c) with AGU2.500 for control of a low temperature system: Refer to the instructions provided with the AGU2.500 accessories for connection and control of a low temperature zone. 15.4 Connecting a zoned system The electrical connection and settings needed to control a system divided into zones vary depending on the accessories connected to the boiler.
  • Page 23 15.5 Connecting a remote water heater (for LUNA HT 1.120 - 1.240 - 1.280 models) LUNA HT 1.120 - 1.240 - 1.280 models are designed for connection of a remote water heater since they are fitted in the factory with a motor-operated three-way valve.

  • Page 24: Gas Change Modalities

    16. Gas change modalities A Qualified Service Engineer may adapt this boiler to operate with natural gas (G20) or with liquid gas (G31). Carry out the following operations in the given sequence: 1) Calibration of the maximum heat output. Check that the CO measured on the flue, with the boiler operating at the maximum heat output, is the same as that shown in table 1.
  • Page 25 LUNA HT 330 G20 - 2H - 20 mbar G31 - 3P - 37 mbar LUNA HT 1.280 max. heat output 8,7% ± 0,2 10% ± 0,2 min. heat output 8,4% ± 0,2 9,8% ± 0,2 Gas nozzle 12,0 mm...

  • Page 26: Setting The Boiler Parameters

    “5” electricity supply to zone pump / valve in the absence of the SIEMENS AGU2.500 accessory. Only one of these functions can be selected. Parameter N LUNA HT 280 LUNA HT 330 LUNA HT 1.120 LUNA HT 1.240 LUNA HT 1.280...

  • Page 27: Control And Operation Devices

    18. Control and operation The boiler has been designed in full compliance with European reference standards and in particular devices is equipped with the following • Overheat thermostat Thanks to a sensor placed on the heating flow, this thermostat interrupts the gas flow to the main burner in case the water contained in the primary system has overheated.

  • Page 28: Positioning Of The Ignition And Flame Sensing Electrode

    19. Positioning of the ignition and flame sensing electrode Figure 16 20. Check of combustion To measure combustion performance and hygiene levels of combustion products, the forced draught boiler models are equipped with two test points on the tapered coupling specifically designed for this parameters purpose.

  • Page 29: Output / Pump Head Performances

    The stainless steel plate-type DHW heat exchanger is easily disassembled with a screwdriver by DHW heat exchanger operating as described below: (LUNA HT 280 - HT 330) • drain, if possible, only the boiler system, through the drain tap; • drain the DHW system from water;...

  • Page 30: Cleaning The Cold Water Filter

    24. Cleaning the cold water following: filter (LUNA HT 280 - HT 330) • drain the DHW system from water. • unscrew the nut on the flow sensing assembly (Figure 19). • pull out the flow sensing device and its filter.

  • Page 31: Boiler Schematic

    26.1 Boiler schematic LUNA HT 280 - HT 330 heating domestic water domestic water heating inlet outlet inlet return Figure 20 Legenda: heating delivery cock 20 main burner gas service cock 21 ignition electrode boiler filling tap 22 air/gas mixture header...
  • Page 32 26.2 Boiler schematic LUNA HT 1.120 - HT 1.240 HT 1.280 heating storage domestic water heating inlet tank feed inlet return Figure 21 Legenda: 23 mixer with venturi heating delivery cock gas service cock 24 gas diaphragm 25 fan boiler filling tap...

  • Page 33: Illustrated Wiring Diagram

    27.1 Illustrated wiring diagram LUNA HT 280 - HT 330...
  • Page 34 27.2 Illustrated wiring diagram LUNA HT 1.120 - HT 1.240 - HT 1.280...

  • Page 35: Technical Data

    28. Technical data Boiler model LUNA HT 1.120 1.240 1.280 Category 2H3P 2H3P 2H3P 2H3P 2H3P DHW rated heat input 28,9 CH rated heat input 24,7 28,9 12,4 24,7 28,9 Reduced heat input DHW rated heat output kcal/h 24.080 28.380 CH rated heat output 75/60°C...
  • Page 36 BAXI , in its commitment to constantly improve its products, reserves the right to alter the specifications contained herein at any time and without previous warning. S.p.A. These Instructions are only meant to provide consumers with use information and under no circumstance should they be construed as a contract with a third party.

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