Manual Saunier Duval Thelia 30 e (page 9 of 15) (English)

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Flow

control valve

Drain point

Filling point

Bypass

valve

Minimum 22 mm diameter

Tundish

(supplied)

Pressure

reducing

valve

(supplied)

Domestic

water

Heating

circuit

Return

Additional

expansion

vessel

(if required)

Boiler

Hot

Cold supply

HEATING SYSTEM DESIGN

• The THELIA 30 E boiler is compatible with any type

of installation.

• Heating surfaces may consist of radiators, con-

vectors or fan assisted convectors.

• Pipe sectional areas shall be determined in ac-

cordance with normal practices, using the output/

pressure curve (diagram 4). The distribution system

shall be calculated in accordance with the out-

put requirements of the actual system, not the maxi-

mum output of the boiler. However, provision shall

be made to ensure sufficient flow so that the tem-

perature difference between the flow and return

pipes be less than or equal to 20°C. The minimum

flow is 500 l/h.

• The piping system shall be routed so as to avoid

any air pockets and facilitate permanent venting

of the installation. Bleed fittings shall be provided

at every high point of the system and on all radia-

tors.

• The total volume of water permitted for the heat-

ing system depends, amongst other things, on the

static head in the cold condition. The expansion

vessel on the boiler is pressurised at 1 bar (corre-

sponding to a static head of 5 m w.g.) and allows

a maximum system volume of 150 litres for an aver-

age temperature of 75°C and a maximum service

pressure of 3 bar. This pressure setting can be modi-

fied at commissioning stage if the static head dif-

fers. An additional expansion vessel can be fitted

to the system if required, see diagram 6.

• Provision shall be made for a drain valve at the

lowest point of the system.

• Where thermostatic radiator valves are fitted, not

all radiators must be fitted with this type of valve,

and in particular, where the room thermostat is

installed.

• In the case of an existing installation, it is ESSENTIAL

that the system is thoroughly flushed prior to installing

the new boiler.

Filling the system

Provision must be made for filling the system at low

level. The use of a WRC approved filling loop is

strongly recommended, connected as shown in

diagram 6.

Diagram 6

Sch 173

DOMESTIC HOT WATER SYSTEM DESIGN

• Copper tubing must be used for the domestic

hot water system. Unnecessary pressure losses

should be avoided.

• The flow restrictor must be fitted in the cold wa-

ter inlet during installation. This limits the flow through

the boiler to a maximum of 12 l/min.

BOILER INSTALLATION

Statutory requirements

The installation of this boiler must be carried out by

a competent person in accordance with the rel-

evant requirements of the current issue of:

The Gas Safety (Installation and Use) Regulations

The Building Regulations

The local water company Byelaws

The Building Standards Regulations (Scotland)

The Health and Safety at Work Act

Sheet metal parts

WARNING. When installing or servicing this boiler,

care should be taken when handling the edges of

sheet metal parts to avoid the possibility of personal

injury.

Installing the boiler

Prior to starting work, the system must be thoroughly

flushed so as to eliminate any foreign bodies and

contaminants such as filings, solder particles, oil,

grease etc.

Note. Solvent products could cause damage to the

system.

• Engage boiler upper part onto the hanging

bracket.

• Allow the boiler to seat down onto support plate.

• Fit filter and washers, strictly adhering to the se-

quential order and directions shown on diagram 5.

• Connect the various couplings between boiler

and connection plate.

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Saunier Duval Thelia 30 e Manual

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