GEMTEX Heating Solutions Ltd GTX 150, Руководство пользователя

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6 G E M T E X H E A T I N G S O L U T I O N S L T D
Important Notice
The safety shut off zone valve is an important safety
device of the unvented GTX tank and must be installed.
Fit the valve to the flow pipework from the boiler
adjacent to the tank. The valve is to be controlled via
the small core L, N and E wire leaving the control panel
of the tank. Drawing number GS-ST-02 page 5 showing
how to connect the “Safety shut off zone valve” to the
tank installation.
Safety Discharge Pipe from Tundish
See Table below for sizing details of safety discharge pipe
from our tundish.
Worked example:
The example below is for a G 1/2 temperature relief valve with
a discharge pipe (D2) having 4 no. elbows and length of 7m
from the tundish to the point of discharge.
From table
Maximum resistance allowed for a straight length of 22mm
copper discharge pipe (D2) from a G 1/2 temperature relief
valve is 9.0m.
Subtract the resistance for 4 no. 22mm elbows at 0.8m each
= 3.2m
Therefore, the maximum permitted length equates to: 5.8m
5.8m is less that the actual length of 7m, therefore calculate
the next largest size.
Maximum resistance allowed for a straight length of 28mm
pipe (D2) from a G1/2 temperature relief valve equates to
18m.
Subtract the resistance for 4 no. 28mm elbows at 1.0m each
= 4m
Therefore, the maximum permitted length equates to: 14m
As the actual length is 7m, a 28mm (D2) copper pipe will be
satisfactory
As an unvented tank it is necessary to fit the “unvented
kit” on the cold-water supply. The “Unvented kit”
contains a pressure reducing valve, non-return valve,
pressure relief valve and optional use balanced cold
water connector. Please see section 7 for details of the
22mm kit for the 150 litre. Section 8 for details of the
28mm kit for the 200 and 300 litre tanks and the section
9 for details of the 1 1/4” kit for the 500 litre tanks.
6. Installation Instructions
Table
Sizing of copper discharge pipe D2 for common temperature relief valve outlet sizes
Valve Outlet Minimum Size Minimum Size Maximum resistant Resistance
Size of Discharge of Discharge allowed expressed as a created by
Pipe D1 Pipe D2 from length of straight pipe each bend
tundish (i.e. no elbows or bends)
G 1/2” 15mm 22mm Up to 9m 0.8m
28mm Up to 18m 1.0m
35mm Up to 27m 1.4m
G 3/4” 22mm 28mm Up to 9m 1.0m
35mm Up to 18m 1.4m
42mm Up to 27m 1.7m