5 Installation
10
Installation and maintenance instructions uniSTOR 0020235301_03
a T-piece for this. The pipe system must continuously
slope downwards, must be visible and must be protec-
ted against frost. There must be no risk of injury to per-
sons.
–
Diameter of the pipe: 22 mm
–
Length of the pipe between the temperature and
pressure relief valve and the expansion relief valve
(4)
≤
600 mm
6.
Connect the cold water supply to the safety group
(2)
.
5.2.5
Installing an expansion vessel
1.
Install the expansion vessel close to the product.
2.
Install a pipe at the expansion vessel and connect the
terminal to the safety assembly
(6)
.
5.2.6
Installing a discharge pipe
≤ 600 mm
≥ 300 mm
D2
2
1
D1
1
Temperature and pres-
sure expansion relief
valve
2
Tundish
The drain connections of the temperature and pressure redu-
cing valve and the expansion relief valve must be connected
to the supplied tundish via 22-mm-thick copper pipes. The
tundish must be installed vertically, as close to the cylinder
as possible and with a maximum clearance of 600 mm from
the connection of the temperature and pressure reducing
valve. It must be installed in the same room as the cylinder,
but at a sufficient distance from electrical components. The
discharge pipes from the temperature and pressure reducing
valve and from the expansion relief valve can be connected
above the tundish using a T-piece. The discharge pipe from
the 28 mm connection of the tundish must consist of copper
pipes with a diameter of at least 28 mm and be connected to
a safe and visible drain point. The vertical section of pipe be-
neath the tundish must be at least 300 mm long before any
bends or diversions in the line. If the total resistance of the
drain line exceeds the values in the following table, you must
increase the diameter of the line. When installing the drain
line, comply with the standards, directives and laws that are
applicable in your country.
Size of
the outlet
valve
Minimum
diameter
of the
discharge
pipe D1
Minimum
diameter
of the dis-
charge
pipe from
the tun-
dish D2
Maximum
permiss-
ible res-
istance,
inform-
ation
on the
length of
a straight
pipe
Resist-
ance per
elbow or
bend
1/2"
15 mm
22 mm
28 mm
35 mm
9 mm
≤
18 m
≤
27 m
0.8 m
1.0 m
1.4 m
3/4"
22 mm
28 mm
35 mm
42 mm
≤
9 m
≤
18 m
≤
27 m
1.0 m
1.4 m
1.7 m
1"
28 mm
35 mm
42 mm
54 mm
≤
9 m
≤
18 m
≤
27 m
1.4 m
1.7 m
2.3 m
Sample calculation
The following example corresponds to a temperature and
pressure reducing valve G1/2 with a discharge pipe
(D2)
with
four 22 mm elbows and a length of 7 m from the tundish to
the drain point. According to the table, the maximum per-
missible resistance for a straight length of a 22-mm-thick
copper discharge pipe
(D2)
of a thermal expansion relief
valve G1/2 is 9.0 m. The resistance of the four 22 mm el-
bows, which are each 0.8 m in length, must be subtracted
from this, i.e. a total of 3.2 m. The maximum permitted length
is accordingly 5.8 m and is therefore below the current length
of 7 m. The calculation must therefore be performed using
the second largest size. The maximum permissible resist-
ance for a straight length of a 28-mm-thick pipe
(D2)
of a
thermal expansion relief valve G1/2 is 18 m. The resistance
of the four 28 mm elbows, which are each 1.0 m in length,
must be subtracted from this, i.e. a total of 4.0 m. The max-
imum permitted length is accordingly 14 m. As the current
length is 7 m, a 28 mm copper pipe
(D2)
should be selected.
A suitable location for the discharge pipe terminal is, for
example, beneath a fixed mesh above the odour trap in a
soakaway with a siphon. Low drain lines, for example up to
100 mm above external surfaces (car parks, meadows, etc.)
can be used provided that they are protected by a wire fence
or something similar to prevent children from coming into
contact with the waste water and provided that the system
is not visible. Do not install any valves or stop cocks on the
drain line.
Make sure that the discharge pipe from the tundish to the
drain has a constant downward gradient of at least 1:200.
The discharge pipe for the heat generator expansion relief
valve can be connected to the horizontal discharge pipe for
the cylinder behind the tundish using a T-piece.
