CLAS HE R - Installation & Servicing Manual

installation Note: •

installation Note: • The distance between the cold feed and the open vent pipe shall be no more than 150mm. • The cold feed must be inverted as shown. • The open vent pipe must be a minimum of 22mm diameter. • The cold feed pipe must be a minimum of 15mm diameter. • The cold feed and open vent pipes must rise continuously and be unrestricted. • The minimum distance from the top of the boiler to the bottom of the F & E tank shall be no less than 2m. Whilst the maximum distance shall be not more than 27m. • The distance between the bottom of the F & E tank and the highest point of the open vent must be no less than 500mm. • The flow and return pipes from the boiler must rise continuously and be unrestricted. • The supply of water to the F & E tank should be taken from the mains water supply via a suitable float operated valve. While the supply from the F & E tank to the boiler/heating circuit (via the cold feed) shall be unrestricted. • The F & E tank must be adequately supported and installed in accordance with relevant Building Regulations. Pump specification The pump should be fitted on the flow pipe from the boiler and have isolating valves each side. A variable duty pump should be set to give a temperature differential of no greater than 20ºC. Draining tap A draining tap must be provided at all the lowest points of the system which will allow the entire system to be drained. A drain tap must also be installed on the flow and return pipes immediately above the boiler to ensure complete draining of the primary flow and return is possible. Drain taps shall be to the current standard of BS 2879. Sealed water systems A sealed system kit is available from Ariston. Installation instructions are supplied with the kit. Pressure Loss Graphs through the boilers mWH 5.0 4.5 4.0 3.7 mWH 3.5 12-18 kW 24 kW 3.0 2.5 2.65 mWH 18 kW 2.0 1.5 1.0 1.3 mWH 12 kW 0.5 0 l/h 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 555 l/h = 20 Δ @ 12.9 kW 1118 l/h = 20 Δ @ 26.0 kW 821 l/h = 20 Δ @ 19.1 kW 14

installation Flushing and Water Treatment The boiler is equipped with a stainless steel heat exchanger. The detailed recommendations for water treatment are given in BS 7593:1992 (Treatment of water in domestic hot water central heating systems); the following notes are given for general guidance. If the boiler is installed on an existing system, any unsuitable additives must be removed. Under no circumstances should the boiler be fired before the system has been thoroughly flushed; the flushing procedure must be in line with BS 7593:1992. We highly recommend the use of a flushing detergent appropriate for the metals used in the circuit. These include cleansers produced by Fernox BetzDearbon, whose function is to dissolve any foreign matter that may be in the system. In hard water areas or where large quantities of water are in the system the treatment of water to prevent premature scaling of the main exchanger is necessary. The formation of scale compromises the efficiency of the thermic heat exchanger because small areas of scale cause a high increase in the temperature of the metallic walls and therefore add to the thermal stress of the heat exchanger. Demineralised water is more aggressive so in this situation it is necessary to treat the water with an appropriate corrosion inhibitor. Any treatment of water by additives in the system for frost protection or for corrosion inhibition has to be absolutely suitable for all metals used in the circuit. The use of a corrosion inhibitor in the sysem such as Fernox MB-1, BetzDearborn Sentinel X100 or Fernox System Inhibitor is recommended to prevent corrosion (sludge) damaging the boiler and system. If anti-freeze substances are to be used in the system, check carefully that they are compatible with the metals used in the circuit. MTS suggests the use of suitable anti-freeze products such as Fernox ALPHI 11, which will prevent rust and incrustation taking place. Periodicaly check the pH balance of the water/antifreeze mixture of the boiler circuit and replace it when the amount measured is out of the range stipulated by the manufacturer (7 < pH < 8). DO NOT MIX DIFFERENT TYPES OF ANTI-FREEZE In under-floor systems, the use of plastic pipes without protection against penetration of oxygen through the walls can cause corrosion of the systems metal parts (metal piping, boiler etc), through the formation of oxides and bacterial agents. To prevent this problem it is necessary to use pipes with an “oxygen proof barrier”, in accordance with standards DIN 4726/4729. If pipes of this kind are not used, keep the system separate by installing heat exchangers of those with a specific system water treatment. IMPORTANT Failure to carry out the water treatment procedure will invalidate the appliance guarantee. System Controls The boiler is electrically controlled and is suitable for most modern electronic time and temperature controls. The addition of such external controls can be beneficial to the efficient operation of the system. The boiler connections for external controls are 240V. MTS supply a range of wired and wireless system controls. Contact your supplier for more details. Location The boiler can be installed on any suitable internal wall (suitable sound proofing may be required when installing onto a stud partition wall). Provision must be made to allow for the correct routing of the flue and siting of the terminal to allow the safe and efficient removal of the flue products. A compartment or cupboard may be used provided that it has been built or modified for this purpose. It is not necessary to provide permanent ventilation for cooling purposes. Detailed recommendations are given in BS 5440 Part 2. If it is proposed that it is to be installed in a timber framed building then reference should be made to British Gas Document DM2, IGE/UP/7 or advice sought from CORGI. Where a room sealed appliance is installed in a room containing a bath or shower, the appliance and any electrical switch or appliance control, utilising mains electricity should be situated specifically in accordance with current IEE Wiring Regulations. For unusual locations, special procedures may be necessary. BS 6798:2000 gives detailed guidance on this aspect. 15