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Thisisdumb Thisisdumb
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6 years ago
What controls the firing of a water boiler?
 
  A) The auxiliary switch on the zone valve
  B) The boiler water temperature is normally maintained by the high limit and the low water cutout
  C) An aquastat that senses the temperature of the water in the boiler
  D) A wall thermostat that senses the temperature of the house

 Q. 2

What is the normal charge on a residential diaphragm type of expansion tank?
 
  A) 30 psig B) 60 psig C) 160 psig D) 12 psig

 Q. 3

What is the maximum water temperature for a low pressure water boiler?
 
  A) 150 F B) 200F C) 180F D) 250F
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yjiang5yjiang5
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6 years ago
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Thisisdumb Author
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#2
6 years ago
Just confirmed the same answer from my friend, thanks
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