Keston C25 Installation Manual download pdf (Page 13)

(ii) An expansion vessel complying with BS 4814 and sized in accordance

with the requirements of BS 5449 and BS 7074 Pt 1. The vessel must be

positioned on the primary return to the boiler.

(iii) A filling point, in accordance with local water authority requirements.

(iv) A method of system make-up (automatic or manual), in accordance with

local water authority requirements.

(v) There must be no permanent connection of mains water to the boiler

system.

(vi) The installation must be designed to work with flow temperatures of up to

110

All components of the system including the heat exchanger of the indirect cylinder

must be suitable for a working pressure of 3 bar and a temperature of 110

Care should be taken in making all connections that the risk of leakage is

minimised.

2.7.3 Hot Water System (if applicable)

The hot water storage vessel must be of the indirect type (certain direct cylinders

can be used provided they are suitably adapted by fitting an immersion calorifier).

DIRECT CYLINDERS MUST NOT BE USED. Further guidance is provided in BS

1394. It is advisable to fit a locksheild valve on the cylinder return to enable

balancing of the flow rate through the cylinder.

The Keston Spa range of stainless steel unvented cylinders are an ideal

option for use with the Keston Celsius 25. The Keston Spa range combine

exceptional recovery times with durable, long life stainless steel

construction and all associated controls. Contact Keston Boilers Ltd for

information

2.7.4 Boiler By-pass Piping

Boiler water flows are critical to the operation of the boiler. If flow cannot be

maintained through the system piping to meet the minimums required by the

boiler, insufficient water flows through the boiler will cause the boiler to "kettle" or

even produce steam which can damage the heat exchanger and will invalidate the

heat exchanger warranty. In addition, an open circuit is required after boiler

shutdown to permit circulation during the boilers 2 minute pump overrun

sequence.

It is normally advisable to incorporate a boiler by-pass in the system, especially if

thermostatic radiator valves are used. The flow/return differential should be 10

to 15

2.7.5 Air Elimination

In the initial charge of water to the boiler system and in all subsequent additions of

water to the system some air will be dissolved in the water. As the water is heated

the air is driven out of the solution and will collect in high spots in the system.

These air bubbles can interfere with pumping and heat transfer and must be

eliminated.

Installation of air bleed valves at the high spot(s) in the system will allow for air

elimination when filling the system and will allow re-venting in a day or so after all

air has been driven out of solution.

2.7.6 System Pump Selection (if required)

The Celsius 25 features an integral circulating pump which has sufficient excess

head to drive most domestic systems. The available head is c.5kPa (0.5m). If the

system index circuit resistance is in excess of the available head from the integral

pump an additional system pump will be required.

WD209/1/2000 Chapter 2 - Boiler Connections The Keston Celsius 25 & 25P

Installation & Servicing Instructions Page : 10

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Keston C25 Installation Manual Page 13

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