HVAC Flashcards
(38 cards)
How is the air handler and/or gas furnace in the attic to be installed?
It should be hung level and square from all 4 corners of the unit to the top cord of the trusses.
How should the air handler be sealed to the plenum?
Completely sealed using a mastic to eliminate any air intake from the attic, walls or garage.
The air handler door should be installed with what?
Screws or plastic clips. No tape.
Condensate lines are to slope a minimum _____ inch per foot away from the pan?
1/8”
Where should the primary condensate be installed?
6” - 8” AFF, and extend 2” - 3” past the stucco with a 90° elbow at the end.
Where should secondary condensate lines be installed?
They should terminate above a clear glass window, extend past the popout with a 90° elbow at the end.
Should any of the condensation lines be run together?
NO! They should all be run separately.
How should the condensate lines be run inside the walls?
In the middle of the stud and top plates.
How much slope should be on the condensate pan?
1/4” per foot
What’s the tolerance for debris in the condensate pan?
No tolerance for any debris.
What should all metal to metal duct connections be sealed with?
They should be sealed with an approved mastic type product to prevent air leaks.
How far should flex duct be kept from the roof sheathing?
Minimum of 2”
Flex duct should be secured every ________ feet ?
Every 4’
What’s the minimum inside diameter flex duct must retain?
80%
How far above the roof line should furnace flue pipes extend?
Between 12” - 24” from the roof tile to the bottom of the flue cap
Flue pipes above the roof line are to be plumb within _____ of an inch per foot?
1/4”
All furnace flue pipes and B-vents are to have what installed on them?
Storm collars
What’s the tolerance for plumb/level on exterior vents for fans, hoods, and dryers?
1/16”
What is to be installed around all hot water heater flue pipes (non-Cathedralized attics)?
And how tall should it be?
A sheet metal insulation barrier.
It should be approx. 24” high, and maintain a minimum 1” clearance form any combustible.
How tall should the dryer box be?
24”
What’s the rule for the distance roof penetrations need to be from hips, ridges, valleys and each other.
24”
What lines are to be wrapped with Armarflex and where?
The liquid line (small line) is wrapped inside the wall cavity.
The suction line (large line) is wrapped all the way from the condenser unit to the air handler.
Line sets in the attic should be secured every _________ feet?
Every 10’
All exterior HVAC wall penetrations except combustible vents, wall hood vents, and exhaust fans are to be installed with what?
Quickflash
