Flushing The System - PENSOTTI PNCC-32N Instruction Manual

4.3 Flushing the system

Failure to flush and add inhibitor to the system will invalidate the appliance warranty.
All systems must be thoroughly drained and flushed using additives – corrosion inhibitors and flushing
agents/descalers.
Pensotti requires the use of the supplied Fernox Commissioning Kit or individual containers of Fernox F3 or F5
cleaner and F1 protector. Follow Fernox installation instructions. Failure to use Fernox F3 or F5 cleaner and F1
protector will void the warranty for all waterside components.
To flush out the primary side of this unit
a. Fill the boiler 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 boiler.
c. In order 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. Open each individual radiator allowing water to flow through then turn that radiator off and repeat for all radiators on
the system.
e. Turn off the filling loop and close the drain cock open all radiators and open the filling to fill the system.
f. Continue to fill the system until the pressure gauge reads in the Green section of the gauge (14.5 psi).
To flush out domestic hot water circuit
a. Open all hot water outlets.
b. Turn on inlet group supply so water enters the boiler; 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 boiler and out of the drain cock.
e. Turn off water supply, disconnect the hosepipe, close the drain cock and refill the boiler.
INSTALLATION INSTRUCTIONS
49