COMMISSIONING INSTRUCTIONS
TR05A140.B1107
33
5.3 Flushing the system
Failure to flush and add inhibitor to the system will invalidate the warranty.
The system must be thoroughly drained and flushed out using flushing agents/descalers that comply
with BS7593. When refilling the system, appropriate corrosion inhibitors and softening agents must be
added.
a. Fill the boiler as per the filling instructions;
b. Using a drain cock on the lowest point of the system, allow the water to drain from both the system and boiler;
c. To flush the system correctly, turn off all radiators, open the filling loop and drain cock simultaneously and allow
the water to flow through the boiler;
d. For each radiator on the system in turn, open the radiator valves, allowing water to flow through, then turn that
radiator off. Repeat for all the radiators on the system;
e. Close the drain cock, re-open all radiators and fill the system following the instructions in Section 5.2;
a. Continue to fill the system until the pressure gauge reaches 1 bar.
5.4 Filling the condensate trap
The condensation trap MUST be pre-filled when starting the boiler for the first time in order to prevent flue gases
from escaping via the drain.
The filling operation is carried out as follows (see Figure 30):
• Remove plug T and fill the trap S three quarters full with water;
• Replace plug T and connect the drainpipe P.
The trap should be cleaned after a few months of boiler operation, as deposits/residues drawn out of
the heat exchanger may impair the operation of the trap.
T
S
Figure 30: Condensate Trap
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