Draining The Central Heating And Domestic Hot Water System - FLOWMAX Technologies FLOWMAX-120 Instruction Manual

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
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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.
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MAINTENANCE INSTRUCTIONS
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Fig. 1