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Biasi 24S Instructions For The Installer
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Biasi 24S Instructions For The Installer

Biasi 24S Instructions For The Installer

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Instructions for the installer
Models covered by these instructions
24S
28S
24SR
Boiler installation and commissioning tips
Do not forget to remove the transit caps and plugs from the boiler connections these are fitted to every
boiler.
Keep the boiler clear of dust during installation and in particular do not allow any dust or debris to enter
the top of the boiler where the flue connection is made. It is recommended that you put a dust sheet over
the top of the boiler until you are ready to make the flue connection.
Because every boiler is fired and tested live at the factory, a small amount of water remains within the
boiler. It is possible for this water to initially cause the pump to seize. It is therefore recommended that
the pump rotor be manually turned to free its rotation before turning the boiler on.
Remember to release the auto air purge before filling the boiler. See the instructions to identify the
location of this device.
Do not remove the cap of the pressure test point of the air switch (top right side of the boiler).
You are strongly advised to flush out the system both cold and hot in order to remove system and
installation debris.
It is also sensible to initially fire and commission the boiler before connecting any external controls such
as a room thermostat. By this method if you have a subsequent problem following the addition of an
external control you can eliminate the boiler from your fault analysis.
Do not forget to range rate the boiler to suit the system requirements. This procedure is covered in the
commissioning section of the installation manual.
If the boiler is fitted with a digital programmer, when setting the times for automatic operation, remember
that for every "ON" time there must be an "OFF" time to follow and that on every occasion you enter a
time you must also indicate which days that you want the boiler to follow the timed settings.
Some products incorporate an anti cycling time delay. It is normal when first switching the boiler on for
the boiler to operate on heating for a few seconds then switch off. After 3–4 minutes has elapsed the
boiler will then re ignite and operate perfectly normally. The ignition delay cycle does not prevent normal
operation of the boiler to provide domestic hot water.
If you are in any doubts as to the installation or operation of the boiler please read the instruction
manuals thoroughly and then if necessary contact Biasi UK for advice and assistance.
Please remember that if you are in any doubt about the installation of this product you can contact our
Technical Helpline on tel. 01902 304400
The manual...
must be read thoroughly, so that you will be able to use the boiler in a
safe and sensible way;
must be carefully kept. It may be necessary for reference in the future.
Important

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Summary of Contents for Biasi 24S

  • Page 1 If you are in any doubts as to the installation or operation of the boiler please read the instruction manuals thoroughly and then if necessary contact Biasi UK for advice and assistance. Please remember that if you are in any doubt about the installation of this product you can contact our Technical Helpline on tel.
  • Page 2 TABLE OF CONTENTS General Overview Combined control panel Heating only control panel Main diagram 24S, 28S Main diagram 24SR Technical data mod. 24S Technical data mod. 28S Technical data mod. 24SR Hydraulic specifications 1.10...
  • Page 3 Checking the pressurisation in the expansion tank Cleaning the burner Checking the exhaust duct Symbols used in the descriptions: Combi = 24S, 28S 24 = 24S, 24SR Central heating = 24SR 28 = 28S This appliance conforms with the EEC directive 90/396 and, consequently, it has the right to make use of...
  • Page 4 1 Air pressure switch 2 Venturi device 3 Fan...
  • Page 5 4 Ignition electrodes 5 Flame–detecting electrode 6 Pump vent plug 7 Pump 8 3 bar pressure relief valve 9 Gas valve outlet pressure tap 10 Gas valve inlet pressure tap 11 Modulation operator 12 Modulation gas valve 13 Main circuit drain cock 14 Three–way diverter valve 15 Three–way diverter valve body 16 Burner...
  • Page 6 38 Lock-out signal lamp 39 Safety thermostat reset button 40 Central heating circuit temperature and pres sure gauge 41 Boiler reset button 42 “Appliance ON” Led 43 Time switch (central heating control) 1.4 Main diagram 24S, 28S fig. 1.4 (key on page 3)
  • Page 7 1.5 Main diagram 24SR fig. 1.5 (key on page 3)
  • Page 8 1.6 Technical data mod. 24S Nominal heat input 26,6 BTU/h 90 754 Minimum heat input 11,0...
  • Page 9 BTU/h 37 530 Maximum useful output 24,0 BTU/h 81 883 Minimum useful output BTU/h 31 730 Central heating Maximum temperature °C Minimum temperature °C Maximum pressure Minimum pressure Available head (in 1000 l/h) 0,26 Domestic hot water Maximum temperature °C Minimum temperature °C Maximum pressure...
  • Page 10 Minimum gas pressures at the burner Natural G20 mbar Butane G30 mbar Propane G31 mbar Minimum gas rate Natural G20 1,16 Butane G30 kg/h 0,87 Propane G31 kg/h 0,85 G 20 p.c.i. 35,9 MJ/m G 30 p.c.i. 45,6 MJ/kg G 31 p.c.i. 46,4 MJ/kg 1 mbar approximately equals 10 mm H Electrical Data Voltage...
  • Page 11 Minimum useful output 11,0 BTU/h 37530 Central heating Maximum temperature °C Minimum temperature °C Maximum pressure Minimum pressure Available head (in 1000 l/h) 0,26 Domestic hot water Maximum temperature °C Minimum temperature °C Maximum pressure 1 000 Minimum pressure Flow rate minimum l/min 30°...
  • Page 12 Minimum pressures at the burner mbar Butane G30 mbar Propane G31 mbar Minimum gas rate Natural G20 1,37 Butane G30 kg/h 1,02 Propane G31 kg/h 1,00 G 20 p.c.i. 35,9 MJ/m G 30 p.c.i. 45,6 MJ/kg G 31 p.c.i. 46,4 MJ/kg 1 mbar approximately equals 10 mm H Electrical Data Voltage...
  • Page 13 Central heating Maximum temperature °C Minimum temperature °C Maximum pressure Minimum pressure Available head (in 1000 l/h) 0,26 Gas supply pressures norm. Natural G20 2 000 1 700 2 500 mbar Butane G30 2 900 2 000 3 500 mbar Propane G31 3 700 2 500...
  • Page 14 1 mbar approximately equals 10 mm H Electrical Data Voltage V˜ 220-240 Frequency Power consumption Protection degree IP44 External fuse rating Internal fuse rating 1,6 T Flue design Minimum venturi pressure mbar -1,2 Flue pipe diameter Coaxial-wall 60/100 Twin split pipes Coaxial-Roof 80/120 Nominal heat flow...
  • Page 15 The boiler is fitted with an automatic by-pass valve (26 on page 3), which protects the primary heat exchanger. In case of excessive reduction or total blockage of water circulation in the central heating system owing to closure of the thermostatic valves or system component cocks, the by-pass valve ensures a minimum flow of water through the primary heat exchanger.
  • Page 16 For unusual locations special procedures may be necessary and BS 6798-1987 gives detailed guidance on this aspect. A compartment used to enclose the appliance must be designed specifically for this purpose. This appliance is not suitable for external installation. 2.3 Flue system The provision for satisfactory flue termination must be made as described in BS 5440-1 1990.
  • Page 17 ∗ specific manufacturer requirements 2.4 Gas supply Gas meter is connected to the service pipe by the local gas region or a local gas region contractor. If the gas supply for the boiler serves other appliances ensure that an adequate supply is available both to the boiler and the other appliance when they are in use at the same time.
  • Page 18 The appliance has an integral sealed expansion vessel to accommodate the increase of water volume when the system is heated. It can accept up to 7 lts (1,5 gals.) of expansion water. If the heating circuit has an unusually high water content, calculate the total expansion and add additional sealed expansion vessel with adequate capacity.
  • Page 19 WARNING: this appliance must be earthed. External wiring to the appliance must be carried out by a competent person and be in accordance with the current I.E.E. Regulations and local regulations which apply. The boiler is supplied for connection to a 240 V˜ 50 Hz supply. The supply must be fused at 3A. The method of connection to the electricity supply must facilitate complete electrical isolation of the appliance by the use of a fused double pole isolator having a contact separation of at least 3 mm in all poles or alternatively, by the use of a 3A fused three pin plug and unswitched shuttered socket outlet both...
  • Page 20 For the installation proceed as follows: - The boiler must be fixed to a strong wall (fig. 3.2). fig. 3.2 - The dimensions for the exhaust fume duct detailed in section 3.5, and the correct procedures for installing the duct, depicted in the instruction leaflet included with the flue kit, must be complied with during installation.
  • Page 21 The latter option in particular, not only cleans out the system, but also has an anti - corrosive effect by promoting formation of a protective skin on metal surfaces and neutralising gases present in the water. We recommend the use of a suitable universal inhibitory to protect the central heating system from corrosion.
  • Page 22 Kit 1 allows the flue to be fitted on any side of the boiler and it can be shortened to a minimum of 0.5 m. Use of extensions allows the exhaust fume duct to be lengthened. For all models the greatest total length is 2,65.
  • Page 23 External 3 A fuse or fused plug with same current rating is recommended. 2 Connect the earth wire (yellow/green). Connection of a room thermostat The room thermostat must be connected to the terminal block situated next to the control panel. When connecting any type of room thermostat, the jumper present between 1 and 2 must be removed.
  • Page 24 3.7 Frost protection It is not possible to fit a conventional frostat with this boiler. However, you can introduce a suitable antifreeze solution into the system to protect the boiler from freeze conditions. Moreover an optional antifreeze kit is available through your authorized dealer. 3.8 Overall dimensions fig.
  • Page 25 ø 22 Central heating return ø 22 Central heating flow ø 22 Domestic cold water inlet∗ ø 15 Domestic hot water outlet∗ ø 15 Pressure relief valve ø 15 connector ∗ not present on c.h. only boilers The positions of the joints are given on separate instructions included with the documents. 4 COMMISSIONING 4.1 Electrical installation Preliminary electrical system checks to ensure electrical safety shall be carried out by a competent...
  • Page 26 Open central heating flow and return cocks. Remove the front panel of the case (see the section Access to and emptying the hydraulic circuits in the service manual. Unscrew the cap on the automatic air release valve (fig. 4.2) one full turn and leave open permanently; fig.
  • Page 27 Continue filling the system. The actual reading should ideally be 1 bar and not less than 0,3 bar. Close all air release valves on central heating system. Inspect the system for water soundness and remedy any leaks discovered. When the installation and filling are completed turn on the central heating system and run it until the temperature has reached the boiler operating temperature.
  • Page 28 The boiler will now go through an ignition sequence and the burner will light. If during the ignition attempt period the boiler falls to light, the full sequence control p.c.b. will go to lockout and the shut-down warning light will appears. To reset the boiler depress the reset push button.
  • Page 29 Set the d.h.w. temperature adjustment and the c.h. temperature adjustment to their maximum position. Check the maximum gas pressure and compare the value on the manometer with the values indicated on the section General - Technical data Check the maximum gas flow at the gas meter and compare with the values indicated on the section General - Technical data turn off the electricity supply;...
  • Page 30 4.9 Adjusting the burner ignition 1 Turn off the boiler by means of the fused spur isolation switch provided with the appliance. 2 Make sure that the function switch (37) is set to the position in fig. 4.8A fig. 4.8B and that the room thermostat, if fitted, is set to “heat demand”.
  • Page 31 tab. 4.1 Ignition pressure Natural G20 mbar Butane G30 1 200 mbar 12,0 Propane G31 1 300 mbar 13,0 4.10 Adjustment of useful central heating output Use a suitable screwdriver to turn the adjustment potentiometer marked “RISC” (fig. 4.10). Rotating the potentiometer anti-clockwise reduces the maximum supply current to the gas modulator device, and thus reduces the gas pressure to the burner.
  • Page 32 fig. 4.12 fig. 4.13...
  • Page 33 Shut the cover of the control circuit board. Close the pressure taps well and re- mount the case properly. 4.11 Instructing the user Hand over the User's instructions supplied with the appliance and explain how to use the unit in both c.h. and d.h.w.
  • Page 34 5.2 Procedures 1 Check that the gas cock (30 on page 3) fitted under the boiler is turned off and the appliance is not live. 2 Take off the front and left- hand side panels as shown in chapter maintenance, section 6.2 of this manual.
  • Page 35 10 Calibrate the gas valve according to the instructions given in the leaflet included with the conversion kit. 11 Replace the the control circuit board cover, the front panel and the left-hand side panel of the case. 12 Stick a label indicating the type of gas, and the pressure level to which the appliance has been set, on the lower protection plate.
  • Page 36 Side panels 2 Loosen the two screws “A” (fig. 6.2) and lift the panels freeing them from the side hooks. fig. 6.2 Lower protection plate 3 Slacken off screws “A” (fig. 6.2) and remove the lower protection plate. 6.3 Emptying the domestic hot water system (Combination boilers only) 1 Turn off the dcw inlet cock (31 in fig.
  • Page 37 6.4 Emptying the central heating system 1. Turn off the c.h. cocks (28, 32 in fig. 6.3). 2. Turn off the central heating drain cock (13 in fig. 6.4). 3. To facilitate the downflow of water, remove the front panel, also remove the sealed chamber lid and loosen the nut of the automatic air bleed valve.
  • Page 38 (2 on page 3) cleaned and the efficiency of the exhaust safety circuit checked at least once a year. For all the above maintenance operations it is advisable to call an approved Service Engineer. BIASI U.K Ltd Unit 32/33, Planetary Road Industrial Estate, Neachelles Lane...

This manual is also suitable for:

28s24sr