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6. Open the packaging for the ZFR flexible pipes (used for interconnection between two collectors). The ZFR pipes are a
fixed length and are not to be cut -- the cone shaped end connections on these pipes are designed specifically for use
with VELUX collectors. Route the ZFR pipes between the collectors and attach to collectors. Secure nuts securely using
wrench. Fully insulate flexible piping connections with insulation and tape provided.
7.
Locate the end of the flexible pipe connected to the bottom left corner of the collector bank (this is the heat transfer fluid
"cold" pipe). Locate the indicator tab near the end connection. Tear off "red" tab from the indicator tab, leaving the "blue"
tab in place -- this will help to identify this pipe as the "cold" pipe later in the installation.
8. Locate the end of the flexible pipe connected to the bottom right corner of the collector bank (this is the heat transfer fluid
"hot" pipe). Locate the indicator tab near the end connection. Tear off "blue" tab from the indicator tab, leaving the "red"
tab in place -- this will help to identify this pipe as the "hot" pipe later in the installation.
18 – Part 3: Solar water heater system installation
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