IDEAL INDUSTRIES HE15, HE9, HE18, HE12 manual General Sealed System Requirements

GENERAL

5 SEALED SYSTEM REQUIREMENTS

ecl6060

Non-return

valve

	Automatic
	air vent
	Hosepipe
	(disconnect
Hose unions	after filling)
	Additional
	stop valve
Temporary hose
(disconnect	Double check valve	Hose connector
after filling)
	assembly
	(note direction of flow)

Note.

The method of filling, refilling, topping up or flushing sealed primary hot water circuits from the mains via a temporary hose connection is only allowed if acceptable to the local water authority.

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 82oC.

c.All components of the system, including the heat exchanger of the indirect cylinder, must be suitable for a working pressure of 3 bar (45 lb/in2) and temperature of 110oC. Care should be taken in making all connections so that the risk of leakage is minimised.

2.Safety Valve

4.Expansion Vessel

a.A diaphragm type expansion vessel must be connected at a point close to the inlet side of the pump, the connecting pipe being not less than 15mm (1/2" nominal) size and not incorporating valves of any sort.

b.The vessel capacity must be adequate to accept the expansion of the system water when heated to 110oC (230oF)

c.The charge pressure must not be less than the static water head above the vessel The pressure attained in the system when heated to 110oC (230oF) should be at least 0.35 bar (5lb/in2) less than the lift pressure of the safety valve.

For guidance on vessel sizing refer to the table in Frame

6. For further details refer to BS.5449. For IE refer to the current edition of I.S. 813.

5.Cylinder

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:

a. A non-adjustable pre-set lift pressure not exceeding 3 bar (45 lb./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.

The cylinder must be either of the indirect coil type or a direct cylinder fitted with an immersion calorifier which is suitable for operating on a gauge pressure of 0.35 bar (5lb./in2) in excess of the safety valve setting. Single feed indirect cylinders are not suitable for sealed systems.

6.Make-up Water

Provision must be made for replacing water loss from the system, either:

a.From a manually fitted make-up vessel with a readily visible water level. The vessel should be mounted at least 150mm (6") above the highest point of the system and be connected through a non-return valve to the system, fitted at least 300mm (12") below the make-up vessel on the return side of the domestic hot water cylinder or radiators.

b.Where access to a make-up vessel would be difficult by pre-pressurisation of the system. Refer to 'Filling.'

classic HE - Installation & Servicing 11