Évaluations - 3, GPA: 4.3
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Facilité d'utilisation
4. Adjust room and cylinder thermostats and programmer to NORMAL settings. The system should be vented directly off the boiler flow pipe, as close to the boiler as possible. The cold feed entry should be inverted and MUST be positioned between the pump and the vent, and not more than 150mm (6") away from the vent connection. Note. Combined feed and vent pipes may also be fitted. There should be a minimum height 450mm (18") of open vent above the cistern water level. If this is not possible refer to Frame 5. The vertical distance between the highest point of the system and the feed/expansion cistern water level MUST not be less than 450 mm (18"). The pump must be fitted on the flow side of the boiler. A suitable pump is a domestic circulator capable of providing a maximum 11oC (20oF) temperature differential across the boiler with the whole of the heating circuit open (e.g. Grundfos UPS 15/50, 15/60 or equivalent). With the minimum flow circuit allowed by the controls the differential must not exceed 25 oC. (18oC for the HE15) The vertical distance between the pump and feed/expansion cistern MUST comply with the pump manufacturer's minimum requirements, to avoid cavitation. Should these conditions not apply either lower the pump position or raise the cistern above the minimum requirement specified by Ideal Stelrad Group. The isolation valves should be fitted as close to the pump as possible. icos - Installation & Servicing 11 GENERAL Non-return valve Automatic air vent Hose unions Additional stop valve Hose connector Hosepipe (disconnect after filling) Double check valve assembly (note direction of flow) Temporary hose (disconnect after filling) ecl6060 Note. The pump manufacturers' minimum requirements must be complied with. 5 LOW HEAD AND LARGE SYSTEMS WITH EXTENSIVE PIPE RUNS - OPEN VENT All dimensions in mm (in.). NB. Imperial dimensions are approximate 6 SEALED SYSTEM REQUIREMENTS This arrangement is useful for large systems where radiators at the extremities are difficult to vent. This can lead to pumping over with conventional feed and vent arrangements. The following conditions MUST be observed: 1. The top of the automatic air vent must be below the cold water level. 2. The static water level (cold) must be at least 200mm above the top of the horizontal flow pipe, fitted as shown. The vent connection MUST NOT be made immediately off the top of the boiler as venting is made less efficient. 3. The maximum practical length of 22mm cold feed pipe should be used in order to reduce the effective volume of hot system water expanding into the feed/expansion cistern to a minimum. a. A non-adjustable preset lift pressure not exceeding 3bar (45lb/in2). b. A manual testing device. c. Provision for connection of a discharge pipe. The valve or discharge pipe should be positioned so that the discharge of water or steam cannot create a hazard to the occupants of the premises or cause damage to electrical components and wiring. 3. Pressure Gauge A pressure gauge covering at least the range 0-4 bar (0-60 lb/in2) must be fitted to the system. The gauge should be easily seen from the filling point and should preferably be connected at the same point as the expansion vessel. Notes. a. The method of filling, refilling, topping up or flushing sealed primary hot water circuit from the mains via a temporary hose connection is only allowed if acceptable to the local water authority. b. When installing the filling device, it must be connected as shown to fully comply with the water regulations. This may involve the fitting of an additional WRAS approval isolator valve to the mains supply. 1. General a. The installation must comply with the requirements of BS. 6798 and BS. 5449. b. The installation should be designed to work with flow temperatures of up to 82 oC. c. All components of the system, including the heat exchanger of the indirect cylinder, must be suitable for a working pressure of 3 bar (45lb/in2 ) and temperature of 110oC. Care should be taken in making all connections so that the risk of leakage is minimised. 2. Safety Valve A spring loaded safety valve complying with the relevant requirements of BS. 6759 must be fitted in the flow pipe as close to the boiler as possible and with no intervening valve or restriction. The valve should have the following features: GENERAL SEALED SYSTEM REQUIREMENTS - continued 4. Expansion Vessel a. A diaphragm type expansion vessel must be pressure. The cold feed pipe from the cistern shouldconnected to a point close to the inlet side of the include a non-return valve and a stop valve with anpump, the connecting pipe being not less than 15 mm automatic air vent connected between them, the stop (1/2" nominal) size and not incorporating valves of valve being located between the system and the any sort. automatic air vent. The stop valve may remain open during normal operation of the system if automatic b. The vessel capacity must be adequate to accept the water make-up is required. exp...
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