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The 16 holes (φ9) above are prepared for fixing the collector.
II. The introduction of the relevant heat conducting media of the plate heat collecting
system
It is the twice (secondary) circulation system that must be selected for the area where icing is possible. The
antifreeze shall be used in the heat conducting medium and propylene glycol is recommended to be used as the
antifreeze (It is forbidden to use the once (primary) circulation system in the area where icing is possible);
The secondary circulation system is recommended for the area where icing is impossible in any season and the
antifreeze could be used as the heat conducting medium. Pure water is recommended to conduct thermal energy.
The primary circulation system is not recommended;
The primary circulation system is not recommended to be used by the plate collector in any case; if it is inevitable
to use the primary circulation system, the problem with the scaling in of the copper pipe must be solved;
The table below contains the valves of the freeze points of the propylene glycol antifreezes which concentrations
are different. The concentration of the propylene glycol antifreeze to be filled in depends on the lowest
temperature of the application area. (It is for your reference only）.
Concentration
5
（volume percent）
Freezing point ℃
-1.7
The processes for filling liquid:
1. Inspect the pipes which have been connected to make sure that the check valve, gate valve, filter and circulation
pump are connected correctly, and that the pipes and connectors have been tightened while the pipes have been
fixed firmly (for the pipe connection, see the figure below);
10
15
20
-3.3
-5.3
-7.2
-9.7
25
30
35
-12.8
-16.4
40
45
50
-20.9
-26.1
-32
55
59
-39.7
-50
5
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