Buderus Logamax plus GB142-24 Installation Instructions Manual page 11

[3] Di electric union
[4] DHW return 1" FPT
[5] Low loss header
[6] Tridicator
[7] System return 1½ MPT
[8] System supply 1½ MPT
[9] Drain valve
[10] DHW supply 1" FPT
[11] Relief valve
▶ Connect the expansion tank to the system.
▶ Connect the pipes so that they are free from strain.
Connecting boiler with DHW tank
▶ Connect the external hot-water tank according to the Installation
instructions of the hot-water tank and fittings concerned.
Piping examples
▶ The following illustrations are two Installation examples.
NOTICE:
▶ The following illustrations are simplified conceptual
illustrations only.
Piping and field components must be field verified.
Fig. 10 is a schematic representation of fig. 9.
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GB142 GB142
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Fig. 10 Schematic representation of the boiler with the hydronic set
[1] Flue gas
[2] Air intake
[3] Pump manifold
[4] DHW return 1" FPT
[5] Low loss header
[6] PT gauge (pressure and temperature gauge)
[7] System return 1½ MPT
[8] System supply 1½ MPT
[9] Drain valve
[10] Pump manifold shut-off valve
[11] DHW supply 1" FPT
Logamax plus GB142-24/30/45/60 – 6720820104 (2017/05)
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PT
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72150200-10.1TD
DANGER:
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 temperature 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), width 2 inch
(50.8 mm);
– 30 Psi (2 bar) discharge pressure;
– discharge is ¾ inch (19.1 mm) female in diameter.
WARNING:
No valve is to be placed between the relief valve and the
tank. Discharge of the relief valve must be conducted to
a suitable place for disposal when relief occurs and no
reducing coupling or other restriction may be installed in
the discharge line.
NOTICE:
▶ For the maximum permissible flow rate of the DHW
pump see section 1.4, page 4.
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Fig. 11 Schematic representation of the boiler with the hydraulic set
connected to an optional hot water tank with one or multiple
zones including one pump and zone valves
[1] Flue gas
[2] Air intake
[3] Optional DHW tank
[4] Primary pump
[5] Shut-off valve
[6] PT gauge (pressure and temperature gauge)
[7] Zone valve
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Installation
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Additional
DHW
Tank
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PT
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72150200-11.1TD
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