Why does a heat pump need two metering devices?
A) One metering device is used for first-stage heat and another for auxiliary heat.
B) Two metering devices provide increased refrigerant flow at low ambient temperatures in heat.
C) One metering device is used for the refrigerant circuit and another for the heat strips.
D) One metering device is used for the cooling cycle and one for the heating cycle.
D
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The first accurate measurements of the properties of high-pressure gases were made by E. H. Amagat in France between 1869 and 1893. Before developing the dead-weight gauge, he worked in a mineshaft and used a mercury manometer for measurements of pressure to more than 400 bar. Estimate the height of manometer required.
What will be an ideal response?
Which of the following statements is true?
a. If an HVAC contractor detects an IAQ problem during routine maintenance, the contractor should immediately inform the customer about the problem in writing. b. HVAC contractors have no liability for system repairs that do not meet local code requirements if the code was changed before the repairs were completed. c. Occupants of a building who claim to suffer from sick-building syndrome may sue the owner of the building, but not the HVAC contractor, for damages. d. The International Building Code requires that HVAC contractors assume unlimited liability when retrofitting existing systems.
Greening the arrangement means inserting ____________________ to fill spaces
Fill in the blank(s) with correct word
During the capacity test the voltage reads 10.6 volts. This indicates that the battery must be replaced.
Answer the following statement true (T) or false (F)