Which of the following is true about the installation of condensate pumps on high-efficiency furnaces?
A) A high-pressure pump must be used.
B) Any pump may be used.
C) A pump must be approved for use with condensate.
D) A filter must always be installed on the pump.
C
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On systems that use two-port zone valves, excessive pressure in the supply header may result when multiple zone valves ____________________.
Fill in the blank(s) with the appropriate word(s).
Drones:
a. Are smaller than worker bees c. Have stingers b. Do no work in the hive d. All of these answers are correct.
What happens to the evaporator fan motor when the defrost cycle is terminated?
A) The fan comes back on to cool the freezer. B) The fan shuts off until the defrost termination thermostat senses that the evaporator is cold again. C) The fan runs at a higher speed until the evaporator has cooled back down. D) The fan stops running backwards and begins to operate normally again.
The relay circuit shown in Figure P18.34 has the following parameters:
(neglect the iron reluctance); k = 1,000 N/m; R = 18 ?. What is the minimum DC supply voltage v for which the relay will make contact when the electrical switch is closed?
Assumptions:
Neglect the iron reluctance