1.6 System D Heat Bank Thermal Stores operate with the standard Sealed Y-Plan layout, using a Motorised Valve(s) to divert the Boiler Flow to either the Heat Bank Thermal Store or to the Radiator Circuit, or to both simultaneously. The Heat Bank Thermal Store remains unpressurised.

1.7 The Heat Bank Thermal Store uses an Indirect Primary Heating Coil to transfer heat to the stored water.

1.8 The Heat Bank Thermal Store is fitted with an Expansion Vessel (8 litre standard) for the Primary Circuit, which is sealed and pressurised. All standard Sealed System Controls are fitted including a Pressure Relief Valve with Pressure Gauge & Filling Loop.

1.9 The unit is also fitted with a Primary Pump, Cylinder Thermostat, Flow Controls, and backup Immersion Heater. A Room Thermostat and Electronic Programmer are supplied loose for site fixing. Fitted controls are pre-wired to a System Wiring Centre.

2 GENERAL REQUIREMENTS

2.1 Read these instructions in conjunction with those of the primary heating appliance before attempting installation.

2.2 Installation shall be in accordance with the latest editions of :

2.3 BS5449 Forced circulation hot water systems

2.3.1 BS6700 Water services for domestic use

2.3.2 The Model Water Bye-laws, the local Water Undertaking Bye-laws and the I.E.E. Wiring Regulations.

2.4 Installation should only be carried out by suitably qualified installers. There is no requirement for approved training in regard to the installation of pressurised or unvented storage cylinders.

2.5 Do not attempt to lift the unit using the pre-fabricated pipework.

2.6 All pre-made connections should be checked & tightened if required prior to installation.

2.7 Pre-Fitted Pumps may need repositioning by installer and inlet connections made watertight. Ensure that access can be made to the Pump Isolating Valves.

2.8 The domestic hot water operates at mains pressure, therefore all pipework and fittings must be suitable for the maximum pressure and temperature duty. Please check that the maximum supply pressure does not exceed 5 bar, and if necessary a Pressure Reducing Valve should be fitted onto the incoming mains. The Heat Bank Thermal Store remains unpressurized at all times.

2.9 Connections in 22mm to the Heat Bank Thermal Store are provided by metric compression bosses, supplied with nuts and olives for direct connection to pipework. BSP fittings should not be used. Spare Nuts are available upon request.

2.10 The stored water in the Heat Bank Thermal Store must be protected with a suitable chemical scale & corrosion inhibitor. See Section 6.

2.11 The cylinder must be installed to allow access to all fitted components for maintenance purposes. This will include the removal and replacement of the Immersion Heater(s).

2.12 Push Fit Connections

2.13 Certain pipework connections are made using push-fit fittings. A Disconnecting Tool will be required to disconnect push-fit joints. Disconnecting Tools & more information can be obtained via our spares departement.

2.13.1 When connecting to a push-fit fitting:

2.13.1.1 Any soldered joints in adjoining pipework should be made prior to connection to the push-fit fitting.

2.13.1.2 Cut tube square using a rotary pipe cutter - do not use a hacksaw to cut the tube.