In what sequence is an HVAC system typically cleaned?
A. Supply, air handler, return
B. Exhaust, air handler, return, supply
C. Return, supply, exhaust, air handler
D. Return, air handler, supply
According to ACR, The NADCA Standard, coil cleaning should be performed:
A. on the upstream side only.
B. on both the upstream and downstream sides.
C. on the downstream side only.
D. when the system is running.
After cleaning the ductwork for a residential high efficiency gas furnace, the client calls stating there is water on the floor around the furnace. Which of the following is the MOST likely cause?
A. Disconnected condensate pump
B. Disconnected gas line
C. Leaking refrigerant liquid line
D. Leaking condenser coil
When a properly wired condensate pump fails, it will:
A. turn off the HVAC system.
B. allow bypass of the condensate.
C. maintain HVAC system airflow.
D. engage dehumidification cycle.
If there is an insufficient drain, an HVAC system condensate drain line should be connected to a:
A. condensate neutralizer.
B. condensate reservoir.
C. condensate collector.
D. condensate pump.
What is the MOST effective way for an ASCS to test the function of a condensate pump?
A. Unplug and plug in the pump
B. Fill the condensate pan with clean water
C. Disconnect the condensate drain line
D. Fill the pump with clean water
Which component is designed to provide the difference in air pressure required to distribute air throughout a system?
A. Heating coil
B. Centrifugal fan
C. Cooling coil
D. Turning vane
An ASCS finds leaks in the supply ductwork of a residential HVAC system that is located in an attic. This will MOST likely cause:
A. positive pressurization of the occupied space.
B. balanced pressurization of the occupied space.
C. negative pressurization of the occupied space.
D. cleaner air for the occupied space.
Which of the following HVAC components controls the room air by regulating hot and cold air?
A. VAV box
B. Mixing box
C. Attenuator
D. Constant volume damper
The MOST common control release mechanism for fire dampers is:
A. fusible links.
B. pneumatic controls.
C. electromagnetic controls.
D. pulling the building fire alarm device.
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