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 5-6 What absolutely has to be done before unsoldering collectors filled with oils or
glycols?
a)
Drain them
b)
Shade them
c)
Heat them up
d)
Turn off the collector loop pump
5-7 Which of these is the best material to repair an absorber plate leak?
a)
Silver solder
b)
Silver-bearing brazing alloy
c)
95/5 tin/antimony solder
d)
50/50 tin/lead solder
5-8 What does grounding the collector frame to the absorber do?
a)
Prevents galvanic corrosion
b)
Protects differential thermostat
c)
Protects collector sensor
d)
Protects collectors against lightning
5-9 Why is multi-strand sensor wire used?
a)
Resists stretching
b)
Easier to run through the roof
c)
Better electrical conductor
d)
Resists RF interference
5-10 What is the minimum amount of insulation for exterior solar piping?
a)
R2
b)
R4
c)
R6
d)
R8
5-11 One bank of collectors in an array has an outlet temperature much higher than
all the others. What should be done?
a)
Nothing
b)
Reduce flow rate through that bank
c)
Increase flow rate through that bank
d)
Increase flow rate through the entire array
REPAIR
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5.4 QUESTIONS FOR SELF-STUDY
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