What can cause the supply voltage to an electric heating system to drop below the minimum voltage when the unit is operated?
A) The system may be low on refrigerant, causing a high amp draw as the compressor struggles to cool the structure.
B) A dirty air filter may be causing a high evaporator fan motor amp draw.
C) Power wire is too small or there are poor connections at either end of the power wire.
D) This is normal. The minimum voltage only refers to the voltage with the unit off.
[Ques. 2] In a series loop system:
A) Only part of the water flows through each convector in the loop.
B) Each convector is supplied with the same temperature hot water.
C) All the water flows through each convector in the loop.
D) The amount of water flowing through each individual convector is controlled by a thermostat.
[Ques. 3] What is used to clean the surfaces of the heat exchanger?
A) Razor blade B) Abrasive sponge C) Soft cloth D) Wire brush
[Ques. 4] When flex duct is hung or run over long distances it must be supported every _____ft with some sort of noncrimping hanger.
A) 10 B) 20 C) 15 D) 5
[Ques. 5] How does performing planned maintenance save the customer money?
A) The customer will receive money-saving coupons to purchase new equipment.
B) Reduced operational cost and longer equipment life
C) Most air-conditioning contractors perform seasonal maintenance at no or reduced cost as a public service.
D) The customer can apply for the federal air conditioning maintenance tax credit.
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