Buderus logamax plus gb142-24 Installation Manual page 15

Piping examples
The following illustrations are two Installation examples.
NOTICE
The following illustrations are simplified concep-
tual illustrations only.
Piping and field components must be field verified.
A hot water boiler installed above radiation level or as
required by the Authority having jurisdiction, must be
provided with a low water cutoff device either as a part of
the boiler or at the time of boiler installation.
Fig. 10 is a schematic representation of fig. 9.
NOTICE
If this boiler is installed in a closed water supply
system with an external indirect DHW tank,
such as one having a backflow preventer in the
cold water supply line, means shall be provided
to control thermal expansion. Contact the water
supplier or local plumbing inspector on how to
control this situation.
Relief valve
The indirect DHW tank must have a tempera-
ture and pressure relief valve installed. The
relief valve shall comply with the Standard for
Relief Valves and Automatic Gas Shutoff
Devices for Hot Water Supply Systems, ANSI
Z21.22-CSA 4.4.
Install the relief valve according fig. 10.
The relief valve must comply with following
specifications:
– dimensions: height 2¼ inch (57.15 mm),
– 30 Psi (2 bar) discharge pressure.
– discharge is ¾ inch (19.1 mm) female in
diameter.
We reserve the right to make any changes due to technical modifications!
Installation instructions Logamax plus GB142-24/30/45/60 • version 10/2007
width 2 inch (50.8 mm).
FLUE GAS
GB142 GB142 GB142
1
PT
2
3
4
Fig. 10 Schematic representation of the boiler with the
hydronic set
pos. 1: DHW supply
pos. 2: drain valve
pos. 3: pump manifold shut-off valves
pos. 4: secondary supply
pos. 5: DHW return
pos. 6: secondary return
Installation 6
AIR INTAKE
pump manifold
5
6
Buderus • http://www.buderus.net
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