REGULATION INSTRUCTIONS
39
Failure to flush and add inhibitor to the system will invalidate the appliance operation.
All systems must be thoroughly drained and flushed out using additives – corrosion inhibitors and flushing
agents/descalers. All flushing must be done for new and retrofit installs.
Warning: Failure to clean the system and add adequate inhibitor invalidates the warranty.
To flush out the primary side of this unit
a. Fill the water heater with clean water as per the filling instructions.
b. Using a drain off cock on the lowest point of the system allow the water to drain from the system and water heater.
c. In order to flush the system correctly, turn off all radiators or fan coils. Open the filling loop and drain cock
simultaneously and allow the water to flow through the water heater.
d. Open each individual radiator or fan coil, allowing water to flow through. Then turn that radiator or fan coil off and
repeat for all radiators or fan coils on the system.
e. Turn off the filling loop and close the drain cock. Open all radiators or fan coils and open the filling to fill the
system.
f. Continue to fill the system until the pressure gauge reaches 14.5 psi (1 bar).
g. Add an inhibitor to the system water to prevent limestone and magnetite deposits from forming and to protect the
water heater from galvanic corrosion.
h. In areas where freezing might occur, an antifreeze (Gycol) may be added to the system water to protect the
system. Please adhere to the specifications given by the antifreeze manufacture. Do not use automotive silicate
based antifreeze. Please observe that the antifreeze and water mixture does not exceed 40% of the antifreeze
content. Do not use antifreeze other than that specifically made for hot water heating systems. Advise systems
operator/ultimate owner that system is filled with antifreeze.
To flush out domestic hot water circuit
a. Open all hot water outlets.
b. Turn on inlet group supply so water enters the water heater; leave to fill until water is released from the hot water
outlets. Turn off all hot water outlets.
c. Connect a hosepipe to the cylinder drain cock and open the drain cock.
d. Allow water to flow through the water heater and out of the drain cock.
e. Turn off water supply, disconnect the hosepipe, close the drain cock and refill the water heater.
f.
4.4 Filling the condensate trap
The condensation trap must be pre-filled when starting the water heater for the first time in order to prevent flue gases
from flowing back through the trap.
The filling operation is carried out as follows (see
fig. 1):
• Remove plug T and fill the trap S three quarters
full with water;
• Replace plug T and connect the drainpipe P
into a condensate discharge trap conforming to
current legislation;
Attention! It is recommended to clean the
condensate trap, after a few months of water heater
operation, to remove deposits/residuals left after
the first condensate passage within the water
heater new components that may interfere with the
correct operation of the trap itself.
4.5 Starting up the water heater
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