?Figure 37-1:
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Use Figure 37-1. How many days is the surface warmer than the ground 30 ft. below the surface??
Fill in the blank(s) with the appropriate word(s).
About 120 days
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Contractors with better-than-average loss experience _____.
a. have an EMR of less than 100 percent b. are penalized in their workers' compensation costs c. have an EMR of more than 100 percent d. may set their own EMR
To close a control circuit and start a system, a remote-bulb thermostat depends on a _____.
a. bimetal strip that expands or contracts b. refrigerant-filled bulb that responds to temperature changes c. mercury-filled bulb that responds to temperature changes d. thermocouple that changes its resistance as the temperature changes
Conditions that can be used to initiate a defrost cycle include
A) high compressor amp draw, low outdoor temperature, or time B) time, high compressor amp draw, high discharge line temperature C) high static pressure drop across the outdoor coil, low liquid line temperature, or time D) low static pressure drop across the outdoor coil, high compressor amp draw, low suction line temperature
The two broad types of fan designs are
A) Centrifugal and axial B) Propeller and squirrel cage C) Forced draft and induced draft D) Forward curved and backward curved