Ch. 32 Residential Split Air-Conditioning System
The electrical connections to a central air-conditioning condensing unit typically include a ____ connection for control.
24 Vac
In central air-conditioning systems, the blower is positioned just before an air filter.
False
Installing a ductless system is more difficult than installing a central air-conditioning system.
False
A ____ system is a multi-split, multizone system.
Split
A central air-conditioning system uses a TXV or fixed orifice metering device to control refrigerant flow into its evaporator.
True
A ductless split system has an outdoor unit and indoor unit.
True
Central air-conditioning systems use multiple thermostats to control the cooling system.
True
Some operating controls may function for both the cooling system and the heating system.
True
The first step in performing scheduled periodic maintenance is to ensure duct registers are not blocked by furniture.
True
To add cooling to a forced-air system, the evaporator would be installed in the plenum downstream of (after) the heat exchanger.
True
Which of the following statements about air-conditioning systems is false?
When cooling mode is active, the burner is off and the evaporator is heated.
Which of the following statements about quick-connect couplings is false?
When the halves are connected, the spring punctures the diaphragm allowing the refrigerant to flow.
Which of the following is not part of central air-conditioning system service?
all of the above
Scheduled periodic maintenance should be performed ____.
annually, before the start of the cooling season
The purpose of blank-off plates is to ____.
block off areas of the plenum so all the air passes through the evaporator
A common service is to add algaecide tablets to the condensate pan under the ____.
condensor
The line set of a ductless system does not typically contain ____.
electrical wiring
When installing refrigerant lines, ____.
insulate the suction line to prevent additional heat absorption wrap the service valves with a wet cloth before brazing the joints make sure the suction line is sloped downward slightly toward the condensing unit
When a condensing unit is installed at a higher elevation than its evaporator, a U-bend should be put in the suction line to ____.
none of the above
A ____ system includes a single evaporator installed in an air handler cabinet that is connected to a network of ducts.
split
The safety controls of comfort cooling systems include ____.
thermostats
The operating controls of an air-conditioning system include ____.
thermostats, motor starters, and relays circuit breakers and relays overloads and pressure limit controls
In a ductless system, the evaporator is placed in the outside unit.
true
