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7
HEATING SYSTEM CONNECTION
7.1
FITTING THE UNVENTED KIT
7.1.1
PARTS TO ASSEMBLE
1
3
5
7
Fig. 14
1
Expansion vessel
2
High flow rate inlet control set
3
Expansion vessel hose
4
Tundish G1" x 28 mm incl. straight fitting. Tundish 15 mm x
22 mm
5
Wall mounting kit for expansion vessel
6
Blending valve
7
Filling loop with valve
7.1.2
CONNECTION
B Mount the expansion vessel with the wall mounting
kit. Connect the expansion vessel hose to the
expansion vessel.
B Connect the expansion vessel and inlet control set
externally to the appliance in line with G3 regulations.
We recommend that this be positioned above the
HWDU.
The blending valve should be fitted between the cold
and the DHW outlet to the tap.
7.2
USE IN HARD WATER AREAS
Normally there is no need for water treatment to prevent
scale formation. In areas where temporary water
hardness exceeds 200ppm, consideration may need to
be given to the fitting of a scale prevention device. In
such circumstances the advice of the local water
authority should be sought.
6 720 641 467 (2010/01)
For latest prices and delivery to your door visit MyTub Ltd - www.mytub.co.uk - info@mytub.co.uk 0844 556 1818
2
4
6
6 720 641 467-80.1I
HEATING SYSTEM CONNECTION
7.3
DETAILED G3 DISCHARGE PIPE
INSTALLATION REQUIREMENTS
The discharge pipework must be routed in accordance
with part G3 of schedule 1 of the building Regulations.
The tundish should be vertical, located in the same
space as the unvented hot water cylinder and be as close
as possible and within 600mm of the safety device e.g.
the temperature relief valve. The discharge pipe from the
tundish should be:
• made of metal
• at least one pipe size larger than the nominal outlet
size of the safety device (larger sizes may be required
if the equivalent hydraulic resistance exceeds that of
a straight pipe 9m long - refer to BS6700)
• terminate in a safe place where there is no risk to
persons in the vicinity of the discharge, and position
safely from electrical devices.
• have a vertical section of pipe at least 300mm long
below the tundish before any elbows or bends in the
pipework
• installed with a continuous fall
• visible at both the tundish and the final point of
discharge or where this is not possible or practically
difficult there should be clear visibility at one or the
other of these locations
15
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