Installer’s Guide
14
Pre Boosted Gas Solar Water Heater MP15
H4099 4099 Rev. D
Installer’s Guide
4 Way Union assembly
Step 17
• Using correct plumbing methods,
install the 4 Way Union assembly
and automatic air vent valve at the
highest point in the system
, at
the top of the collector diagonally
opposite the solar collector inlet pipe.
• The automatic air vent valve
must
stand vertically
straight towards
the sky.
Note: If installed in top left/
bottom right of collector, then
T should be reversed.
• When fitting the 4 Way Union
assembly, we recommend Loctite
577 Thread sealant and/or a good
quality pink teflon tape to secure the
automatic air vent valve. Tighten by
hand.
Do not use spanner
.
• If the system is installed correctly,
air will automatically be purged from
the system through the automatic air
vent valve.
Valve must be
vertical and at
highest point in
system
Use Loctite 577
thread sealant or
pink teflon tape to
seal all threads