Boiler house Feedtank ancillaries
2
Installation For new applications
For new applications a specific connection should be incorporated into the feedtank design. This connection should be the same nominal size as the pump and should be positioned as near as possible to the bottom of the tank. The suction side isolating valve, strainer and pump should be positioned as near to the tank as possible whilst allowing access for operating the ball valve and removing the strainer screen. The discharge side pipework should be as short in length as possible. On RFS2 systems the discharge pipework should be reduced to 1" at the spray nozzle. The pump must be wired in accordance with The Electricity at Work Regulations, that is, using a direct on-line (DOL) starter fitted with a thermal overload plus local isolator. For retrofit applications Where no suitable spare connection is available it is recommended that the drain connection be utilised by fitting a 'T' piece as follows. It should be noted that the tank does not need to be drained to fit these pieces.
Existing drain valve
2.1 7
New drain valve
To recirculating pump suction
Caution For all applications the pump shaft must be horizontal, or slightly higher at the vent plug end to prevent premature wearing of the top bearing and shaft. Operation The pump should run continuously when the boiler(s) is on load. Water should flow through the pump at all times while the pump is running. Maintenance At convenient regular intervals it is recommended that the strainer screen is inspected and any debris removed.
TI-P401-08 EMM Issue 4
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RFS1 and RFS2 Recirculating Feedwater Spray Systems
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