FLOWMAX Technologies FLOWMAX-120, Instruction Manual, Page: 55 / 88

MAINTENANCE INSTRUCTIONS
51
6.6 Draining the central heating system
If the need arises to drain the system, this can be done as follows:
•
Switch the system to “WINTER” mode and ignite
the water heater.
•
Switch off the power supply to the water heater.
•
Wait for the water heater to cool down.
•
Connect a hosepipe to the system drain point and
locate the other end of the hose in a suitable
drainage system.
•
Open the system drain valve (see fig. 1).
•
Open the air vents on the radiators, starting with
the highest and moving down the system to the
lowest.
•
When the system has been drained, close the
radiator breather valves and the drain valve.
•
If only the water heater needs to be drained,
close the flow/return isolating valves on the
heating circuit and open the drain valve located at the bottom of the water heater on the pump manifold
(see fig. 1);
■
Draining the domestic hot water system
If there is a danger of freezing, the domestic hot water system should be drained. This can be done as follows:
•
Close the mains water supply valve.
•
Open all the hot and cold water taps.
•
On completion, close all the previously opened taps.
Fig. 1