Baxi Potterton Gold FSB 30 HE manual Pipework, Low Head Installation, Air Vents

Boiler Air

Vent

	Copper
Copper	0.5m
0.5m	Flow
Boiler
	Return
Copper
1m

Fig. 9

500mm	22mm
45°	Open Vent

6.0 System Details

6.3Pipework

1.The sizes of flow and return pipes from the boiler should be determined by normal methods, according to the requirements of the system.

2.The connection tails for the boiler are 28mm diameter. The 28mm section of the tails can be cut back to 22mm if required.

3.The flow & return tails are push - fit ‘O’ ring

Boiler Air

Vent

Boiler

1000mm		15mm
	Min		400mm
		Cold
		Feed	Min Head

150mm

Max

Pump

Flow

Return

and clip connections within the boiler case.

4. A 20 °C drop in temperature across the system is

recommended for condensing boilers. Existing radiators

may be oversized and so allow this, but where radiator

sizing is marginal it may be advisable to retain a system

temperature drop of 11°C.

5. In systems using non-metallic pipework it is necessary

to use copper pipe for the boiler Flow and Return. The

copper must extend at least 1 metre from the boiler and

include any branches (Fig. 9).

Fig. 10 Typical Low Head Installation

6. This boiler does not require a bypass.

Boiler Air

Vent

Boiler

500mm		22mm
		Open Vent
	45°
	15mm	400mm
1000mm	Cold
		Min Head
Min	Feed
	150mm
	Max
			Pump
		Return	Flow

6.4Low Head Installation

1.Using a close couple arrangement the minimum head is as shown in the diagrams (Figs. 10 & 11) subject to the following conditions:

a)The pump being adjusted to give a 20°C drop across the boiler.

b)The pump must be fitted on the flow.

c)The pump must be fitted in accordance with the pump manufacturer's instructions.

d)The open vent pipe must be taken up from a tee in a horizontal section of the flow pipe.

2. For heads below 400mm then an alternative utilising a

combined vent and feed pipe may be connected (Fig. 12).

Fig. 11	If Conditions Require,
	This System Possible

	200mm	22mm
Boiler Air		Feed & Vent
	Min
		Pipe
Vent
		Air
		Separator
Boiler		Pump
		Flow
		Return

Fig. 12 Alternative Low Head Installation

This must be a minimum of 22mm diameter. It is
recommended that an air separator is fitted when using a
combined feed and vent pipe.
6.5	Air Vents

For correct operation of the flow switch the boiler and system MUST be completely vented.

1.A manual air vent is fitted on the flow pipe, to enable complete venting of the boiler. The pipe access panel must be removed to do this.

2.Additional vents should be fitted at suitable points on the system as required.

12© Baxi Heating UK Ltd 2011