Buderus Logamax Plus GB142-24 Installation Instructions Manual page 16

6 Installation
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.
16 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
width 2 inch (50.8 mm).
FLUE GAS
GB142 GB142
1
3
5
7
Fig. 10 Schematic representation of the boiler with the hydronic set
pos. 1: DHW supply 1"FPT
2: DHW return 1"FPT
3: pump manifold shut-off valve
4: Low loss header
5: drain valve
6: PT gauge (pressure and temperature gauge)
7: System supply 1½ MPT
8: System return 1½ MPT
AIR INTAKE
pump manifold
2
4
6
PT
8