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 4-10 If the flow rate of the storage loop of a drainback system is in the correct range,
what should the temperature change in that loop be in degrees F?
a)
1
b)
5
c)
25
d
50
4-11 What is water with a high percentage of magnesium or calcium compounds
called?
a)
Hard
b)
Corrosive
c)
Aggressive
d)
Acidic
4-12 What should be done to a pressure reducing valve on a makeupwater system
feeding a glycol loop?
a)
Set it for 5 PSI
b)
Set it for 35 PSI
c)
Open it all the way up
d)
Close it off and tag it
4-13 Which of these is compatible with synthetic oils?
a)
Hydrin
b)
EPDM
c)
Standard pipe dope
d)
Butyl rubber
4-14 What causes phantom leaks in glycol loops?
a)
Pressure relief valves
b)
Temperature and pressure relief valves
c)
Automatic air vents
d)
Brass fittings on copper tubing
TROUBLESHOOTING
135
4.4 QUESTIONS FOR SELF-STUDY
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