Checking The Connections; Flue Systems - Benchmark RD 532 combi Installation And Servicing

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Installation

Fixing the appliance

B Fit the washers onto the gas and water connections.

B Lift the boiler onto the wall-mounting frame. The lugs

pass through the rectangular holes in the boiler back

panel.

B Take care not to disturb the washers on the connec-

tions.

Connecting the flue duct

B Fit flue duct connector onto appliance flue spigot.

B Secure with screws supplied.

Flue Turret

Flue seal

Retaining

Screw

Appliance

Flue Socket

Fig. 14

B For remaining installation of flue assembly, refer to

the relevant installation instructions.

3.8

Water connections

B Check that the O-rings or seals are in place before

B Turn on the service valves for central heating flow

B Check all seals and unions for leaks (testing pressure

B Turn on cold water service cock and fill hot water sys-

B Check all connections for leaks.

Gas supply pipe

B Check that the seal is in place before tightening the

B Turn off gas cock to protect gas valve against dam-

Flue Turret to

Boiler Sealing

Gasket

B Check gas supply pipe.

B Release the pressure on the gas supply pipe.

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3.9

The only flue systems that may be used are those sup-

plied with the boiler.

The flue system must be installed in accordance with

the requirements of BS5440:1.

Standard 100 mm flue system

The standard concentric flue system provides for a hor-

izontal length of up to 4 m. Full instructions for fitting this

flue are in Subsection 3.9.2 "Installation of the flue".

Alternative 125 mm diameter flue systems

Installation instructions for the alternative flue systems

are sent with the appropriate flue kit.

Systems are available to give a maximum horizontal

length of 13 m.

A vertical flue system up to a height of 13.7 metres is

available.

45° and 90° flue bends can be used with a correspond-

ing reduction in flue length of 2m for each 90° bend and

1 m for each 45° bend used.

IMPORTANT: Any horizontal flue system fitted to a

condensing boiler must incline from the appliance at an

angle of 3° (30 mm per metre length) to prevent con-

densate dripping from the flue terminal.

Note, the standard 100mm horizontal flue requires only

a 0.5° incline from the boiler as the inner exhaust pipe is

inclined at 2.5° inside the outer pipe.

This means that the clearance above the appli-

ance must be increased to match the duct length.

Refer to fig. 1 on page 5.