33
2) If the storage tank or other system components are being concurrently drained, refer to their
instruction manuals for details. If storage tank is not being drained, isolate piping to and from the solar
collector (isolation valves should already be installed). Immediately open drain valves on both lines (or
undo fittings). Never leave the isolation valves in the off position while the collector is full of water and
exposed to sunlight. The water will heat and cause a pressure increase which may rupture
fittings/connections.
NOTE:
In good weather the water may be hot or have built up pressure, so take care when
opening the drain valve.
3) Allow the manifold to sit in a vented state for 5 – 10 min to boil dry (may take longer in poor weather).
4) Always leave one drain valve or fitting open. Otherwise the system may build up pressure when it
heats. For draining of other types of systems, please refer to specific instructions for the system.
Draining the collector must be done with caution, as released water may be scalding hot. Take care when
opening the drain valve. Failure to do so could result in property damage, serious injury, or death due.
Table 4
F. OTHER COMPONENTS
Other parts of the system, such as the pump and storage tank, should be serviced/inspected according to
the manufacturers own maintenance guidelines.
G. STAGNATION
When going on vacation or not using your solar water heating system for a significant length of time (> 14
days), take care to prevent stagnation. Drain the solar system and cover the collectors to prevent
stagnation damage.
PART 9: TROUBLESHOOTING
Inspection items with an (
H
) in front may be completed by the homeowner, but only if investigation is
clearly SAFE and EASY. Any information obtained during an investigation can then be relayed to the
company who supplied and installed the system. Any other system troubleshooting, adjustments, or
repairs may be completed ONLY by authorized persons.
APPROXIMATE TIME / TEMPERATURE
RELATIONSHIPS IN SCALDS
120
o
F
More than 5 minutes
125
o
F
1 ½ to 2 minutes
130
o
F
About 30 seconds
135
o
F
About 10 seconds
140
o
F
Less than 5 seconds
145
o
F
Less than 3 seconds
150
o
F
About 1 ½ seconds
155
o
F
About 1 second
Figure 20 – Scald Warning Label
Summary of Contents for HP-30SC
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