What provisions should be made to prevent water from freezing during low temperature periods of operation for a hydronic heating system?
What will be an ideal response?
Prevent the water from reaching the freezing point.
If the water cannot be prevented from reaching the freezing point then use an antifreeze solution in the system in place of pure water, to lower the freezing point to a safe.
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What is the value of a common fraction with 2 3/16 in the numerator and 3/4 in the denominator?
A. 1 11/12 B. 2 1/6 C. 2 2/3 D. 2 11/12
Superheat occurs in the condenser as well as the evaporator.
Answer the following statement true (T) or false (F)
What does blue exhaust smoke indicate?
A) Excessive fuel B) Insufficient oil C) Coolant in combustion chamber. D) Burning oil
Which type of separation ensures that every signal conductor from a RED device routes to another RED device, or becomes encrypted before connecting to a BLACK device?
a. Physical. b. Electrical. c. Equipment. d. Mechanical.