Week 2 Install EXAM

What is the function of AHRI?

• The institute’s most important function is to establish product or application standards by which the members can design, rate, and apply to their hardwar

• Mainly SEER matching equipment

Mainly SEER matching equipment

• Minimum circuit ampacity

• RLA

What type of overcurrent protection is used with air conditioning equipment?

• Dual element time-delay fuses or HVACR rated circuit breakers

• 30 and 60 AMP Disconnects

When installing a split system, what should be done prior to opening the installation valves?

• Evacuate the refrigerant lineset and coil

• Be sure that 120v is going to furnace and 240v to Condenser

What is the first step in preparing to install a new furnace?

• Pick up equipment from the supply house.

• Determine the disconnect and breaker size that will be needed

• Take a smoke break 15 min before you start

• Determine the correct size of system

What is the most common manifold pressure for natural gas furnaces?

• 3.5 inches WC

• 10 inches WC

• 5 inches WC

• Higher the pressure the higher the gas bill

What is the temperature rise of a furnace with a supply air temperature of 130°F and a return air temperature of 75°F?

• 130°

• 55°F

• 75°

• 45°

How can the temperature rise of a furnace be reduced if the temperature rise is too high?

• Use a high flow filter

• Increasing the air flow will reduce the furnace temperature rise.

• Adjust the damper vents

  
  

• Adjust the thermostat

What precaution needs to be taken when installing a condensing furnace in an attic over a finished ceiling?

• Properly ground the furnace, if a leak should occur an electrical fire could start and there is a lot of wood in the ceilng

• 
  Install a drain pan under the entire furnace to prevent damage to the ceiling in the event of a plugged drain.

• Use metal straps to prevent the furnace from falling through the ceiling

• Install vibration pads to prevent damage to the ceiling from vibration

Explain what is meant by a concentric vent pipe.

• A concentric vent pipe may appear to be only one pipe but it’s really one pipe inside the other which still qualifies for a two-pipe system.

• A concentric vent pipe is just a large pipe that you push to pvc pipes through

• A concentric vent pipe is very expensive

• A concentric vent pipe is better than a B Vent pipe