Water Systems

1.GENERAL

1.1The appliance is suitable for fully pumped open vent & sealed systems only and the installation must comply with the requirements of BS 6798 and BS 5449. Fit a drain off cock in the lowest part of the system. Where the boiler is also to be used for providing domestic hot water, a double feed indirect cylinder to BS 1566 Part must be used.

1.2An adjustable bypass valve must be fitted between the flow and return and it must be adjusted so that the return temperature to the boiler is always above 60°C. After setting this, the bypass should then be fixed. This will increase the life of the heat exchanger and failure to fit a correctly adjusted bypass will invalidate the warranty.

1.3Flush out the system to remove any swarf or residues before fitting the circulating pump.

2.SYSTEM CONTROLS

2.1Operation of the system under control of the boiler thermostat alone does not produce the optimum efficiency. The heating system should include a control system. This should comprise of at least a single channel programmer or thermostatic radiator valves (TRV). In the case of the boiler being used for central heating and domestic hot water, a 2 channel programmer should be used.

3.SEALED SYSTEMS

3.1The appliance is suitable for connection to a sealed system and the installer needs to fit an expansion vessel of the correct size, pressure relief valve, pressure gauge, pump and automatic air vents and provide provision for filling. See diagram 1 for schematic piping diagram.

1
	AIR VENT	TOP UP
		BOTTLE
	PRESSURE GAUGE
SAFETY VALVE	PUMP
	BYPASS	HEATING
	VALVE	CIRCUIT
	EXPANSION
	VESSEL
FILL POINT
	SEALED SYSTEM PIPING DIAGRAM

4. EXPANSION VESSEL REQUIREMENTS

Vessel Charge & Initial System Pressure	Bar	0.5	1	1.5

	psi	7.31	4.5	21.8
	psi	7.31	4.5	21.8

To calculate the expansion vessel
required multiply the total system
volume (including 38L for boiler)		0.08	0.11	0.16
by the following factor

Note if the system pressure gauge indicates 2.6 bar or higher with the appliance at maximum temperature and all radiators in circulation an additional vessel is required.

Total water content of boiler is 38 litres.

5.SYSTEM FILLING

5.1A sealed system must only be filled by a competent person using one of the approved methods shown in diagram 2. The system should incorporate the connections appropriate to one of these methods. It is recommended that a suitable inhibitor is added to the system after the final hot flushing.

METHOD OF MAKEUP:

5.2Water loss from the system should be replaced from a makeup vessel connected to the system through a non return valve on the return side of the heating circuit. This vessel should be higher than the top of the system.

5.3Alternatively provision can be made by pre-pressurisation of the system via a temporary hose connection and through a double check valve (non-return) and stop valve.

Central Heating Cooker Natural Gas specifications

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