Baxi Solo 2 PF Quick Start Manual download pdf (Page 9)

3.0 System Details

3.6 Sealed Systems (Fig. 8)

1. SAFETY VALVE - A safety valve complying

with the requirements of BS 6750 Part 1 must be

fitted close to the boiler on the flow pipe by means

of a horizontal or vertically upward connection

with no intervening valve or restrictions and

should be positioned to facilitate testing. The

valve should be pre-set and non-adjustable to

operate at a pressure of 3 bar (45 Ibf/in

). It must

be arranged to discharge any water or steam

through a pipe to a safe outlet position.

2. PRESSURE GAUGE - A pressure gauge of

minimum range 0-4 bar (0-60 Ibf/in

) with a fill

pressure indicator must be fitted to the system,

preferably at the same point as the expansion

vessel in an easily visible position.

3. EXPANSION VESSEL - An expansion vessel

complying with the requirements of BS 4814 must

be fitted to the system by means of a connection

close to the inlet side of the circulating pump in

accordance with the manufacturers instructions,

the connecting pipe being unrestricted and not

less than 15mm (

in) nominal size. The volume

of the vessel should be suitable for the system

water content and the nitrogen or air charge

pressure should not be less than the system static

head (See Table. 1).

Further details of sealed system design can be

obtained from BS 5449 and the British Gas

publication entitled 'Specifications for Domestic

Wet Central Heating Systems'.

4. FILLING POINT - A filling point and an

approved stop valve to BS 1010 must be fitted at

low level and the method used for filling the

system should be approved by the local water

undertaking. For further details see BS 6798.

5. MAKE UP SYSTEM - A method of replacing

water lost from the system should be provided

either by means of a make up vessel of not more

than 3 litres (5 pints) capacity, mounted above the

highest point of the system, or by pre-

pressurisation of the system.

6. VENTING - A method of venting the system

during filling and commissioning must be provided

by fitting automatic air vents or by venting

manually.

7. HOT WATER STORAGE - The hot water

storage vessel must be of the indirect coil type. All

components used in the system must be suitable

for operation at 110°C (230°F) and at the

pressure allowed by the safety valve.

Initial System

Pressure (Bar)

Vessel Charge

Pressure (Bar)

Multiply Total

Water Content Of

System By (Litres)

0.067

0.112

0.207

0.441

0.087

0.152

0.330

0.125

0.265

0.5

1.0

1.5

2.0

1.0

1.5

2.0

1.5

2.0

0.5

1.0

1.5

Example :-

Then :-

System Volume = 75 litres

Vessel Charge Pressure = 1.0 bar

Initial System Pressure = 1.5 bar

75 x 0.152 = 11.4 litres

Expansion Vessel Volume

Method of determining minimum

value of expansion vessel volume for

sealed systems using Baxi Boilers

NOTE

Where a vessel of the calculated size is not obtainable

then the next available larger size should be used.

Safety

Valve

Pressure

Gauge

Pump

Filling

Point

Air

Vent

3 Litre

Top Up Bottle

(if required)

Radiator

Circuit

Expansion

Vessel

System Drains

at Low Point

Max Boiler Flow

Temp = 82° C

Boiler

Fig. 8

Table. 1

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 43 44

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Baxi Solo 2 PF Quick Start Manual Page 9

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