5
Boiler block assembly
Logano G225/Logano plus GB225 - We reserve the right to make any changes due to technical modifications.
27
5.2
Checking for leaks
Only carry out a leak test if the boiler heat exchanger has
not been delivered pre-assembled.
5.2.1
Preparing for a leak test
V
Seal off all boiler bosses
(
Æ
Chapter 5.1.12, page 26).
V
Seal off the flow and return connections. (Fit a air vent
valve to the Rp ¾ connection profile.)
5.2.2
Carrying out the leak test
Carry out a leak test at a test pressure of 5.8 bar (in
accordance with the requirements of the European
Pressure Vessel Directive).
V
Slowly fill the boiler block via the boiler fill & drain valve.
While filling, keep the air vent valve at the highest point
of the boiler open until water runs out of it.
Hub joints leaking?
V
If a hub joint is leaking, first drain the water through the
boiler fill & drain valve.
V
Remove the water pipes.
V
Remove the feed pipe.
V
Release and remove the anchor rods.
V
Split the leaking boiler heat exchanger at the leaking
joint by driving in wedges or chisels.
For the remaining stages of boiler installation, refer to
Æ
Chapter 5.4, page 28.
Fig. 27 Separating the boiler block
Observe the specifications on the rating
plate.
Use a class 1.0 pressure gauge for the
pressure test.
Caution: Risk of system damage from
excessive pressure.
V
Ensure that no pressure, control or safety
equipment is fitted while the leakage test
is being carried out.
Clean the bosses before reassembling.
Always fit new boss liners and new packing
cord when reassembling.
Press the boiler heat exchanger back
together.
Fit the anchor rods and feed pipe.
Connect the water pipes.
Repeat the leak test.
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