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4.4
Filling procedure
● DO NOT turn on any heat source connected to the storage tank until it is filled.
● Ensure that all installation, electrical and safety requirements have been met.
● Check all plumbing and electrical connections are properly connected.
● Make sure that unused connections are closed with sealing plugs.
● Open the bleed valve on the set which is connected to the tank and start filling
slowly.
● Let the unit fill. Allow the water to run for a period to flush connecting pipework,
checking the bleed valve periodically.
● Close the bleed valve.
● Open all water outlets connected to the tank to ensure residual air is eliminated
from the installation.
● Close all water outlets and check for water leaks in the system.
● Fill any circuits connected to the tank and purge accordingly.
● Test manually the pressure regulating valve and the safety valves on each hydrau-
lic circuit.
4.5
Emptying procedure
● Check that the heat source connected to the boiler and any loose electrical con-
nections are off.
● Disconnect the water supply to the tank.
● Open a bleed valve on the set connected to the tank to allow the entry of air into
the system.
● Open the discharge of the system, paying attention to the high temperature of the
water outlet as it could cause damage to property or persons.
4.6
Maintenance procedure
● Check periodically (at least once a year) the smooth operation of the safety valve.
● In DHW tanks, always install a passive cathodic protection (magnesium anode)
or active (impressed current anode) and check periodically, at least twice a year,
wear a sacrificial magnesium anode or the presence of power supply on the anode
impressed current; an anode of magnesium, which has consumed more than 60%,
should be replaced.
● Inspect all water connections for leakage every year.
● Dismantle the flange with the DHW heater and clean the bottom tank internally
every other year if the water quality is poor.
● Test safety thermostat and check electrical connections for DHW heater every year.
● Leak search refrigerant connections at the top of the tank for heat pump every year.
● Leak search refrigerant hose from double coil every year.
● Inspect the coil and clean it if necessary every other year.
● Test run the heat pump and check sensor info parameters.
● Check outdoor unit procedures referenced to the service manual for the outdoor unit.
PAW-VP•LDHW - Technical Manual – 2020-07
Water Piping Installation
4
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