Baxi MainEco Heat 15 Service Manual download pdf (Page 24)

24 MainEco Heat

5 Before Installation

7215845 - 01 (08/14)

5.2.7 System Details - General

Water Circulating Systems

1. The appliance is suitable for use with open vent fully pumped

systems and sealed systems .

The following conditions should be observed on all systems:

• The static head must not exceed 25m of water.

• The boiler must not be used with a direct cylinder.

• Drain cocks should be fitted to all system low points.

• All gas and water pipes and electrical wiring must be

installed in a way which would not restrict the servicing

of the boiler.

• Position isolating valves as close to circulating pump as

possible.

Pipework

1. The sizes of flow and return pipes from the boiler should be

determined by normal methods, according to the requirements

of the system. The connections on the boiler are 22mm.

2. A 20 °C (36°F) 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 (20°F).

3. 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. 3).

5.2.8 Low Head Installation / Open

1. Using a close coupled arrangement the minimum head is as

shown in the diagrams (Figs. 4, 5 & 6) subject to the following

conditions:

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

the boiler.

b) Ideally the pump should be fitted on the flow but

providing that the cold feed and open vent pipe are

positioned correctly (e.g. the system is not prone to

pumping over, air entrainment etc.) the pump may be

fitted on the primary return pipe.

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.

Venting

1. A method of venting the system during filling and

commissioning is provided by an automatic air vent fitted inside

the boiler. The air vent is supplied in the open position.

Typical Low Head Installation

If Conditions Require,

This System Possible

Alternative Low Head Installation

Boiler

500mm

45°

22mm

Open Vent

1000mm

Min

150mm

Max

15mm

Cold

Feed

400mm

Min Head

Return

Pump

Flow

Boiler

500mm

45°

22mm

Open Vent

400mm

Min Head

1000mm

Min

15mm

Cold

Feed

150mm

Max

Return

Pump

Flow

Return

Pump

Flow

Boiler

200mm

Min

Air

Separator

22mm

Feed & Vent

Pipe

Fig. 4

Fig. 5

Fig. 6

Flow

Return

Copper

0.6m

Copper

0.4m

Fig. 3

400mm

Min Head

Boiler

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 63 64

Comments to this Manuals

No comments

Baxi MainEco Heat 15 Service Manual Page 24

Comments to this Manuals

Related products and manuals for Water heaters & boilers Baxi MainEco Heat 15