Draining The Central Heating And Domestic Hot Water System - PENSOTTI Solenne PCH50B-H 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 "HEAT" mode and ignite the
boiler.
•
Switch off the power supply to the boiler.
•
Wait for the appliance to cool down.
•
Connect a hosepipe to the system drain point R and
locate the other end of the hose in a suitable drainage
system.
•
Open the system drain valve (fig. 1).
•
Open the manual air vent located on the primary heat
exchanger.
•
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
air vents and the drain valve.
•
If only the boiler needs to be drained, close the
flow/return isolating valves on the heating circuit
and open the drain valve R located at the bottom of the boiler 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.
Freeze Protection
Glycol must not be used in Domestic Hot Water applications.
System winterization (non-operative system)
Because it may be impossible to completely drain the boilers heating circuit, D.H.W
circuit and distribution system. Pensotti recommends the introduction of the proper type
antifreeze to protect these systems from freezing damage.
Domestic Hot Water applications.
System winterization (operating system)
Pensotti boilers are certified for indoor use ONLY. Proper precautions for freeze
protection are recommended for boilers and associated piping in areas where the
danger of freezing exists. Do not use automotive antifreeze. Pensotti recommends the
use of inhibited glycol concentrations between 20-35% glycol. Glycol products must
be maintained properly so they do not become inactive or corrosive, consult glycol
specifications for more information.
MAINTENANCE INSTRUCTIONS
Fig. 1
Glycol must not be used in
R
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