HVAC Flashcards
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?
1/6”
What is to be installed around all hot water heater flue pipes?
And how tall should it be?
A sheet metal insulation barrier.
It should be approx. 24” high, and maintenance 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
How are the line-sets to be sealed at the exterior wall jack?
With an approved caulking or UV resistant tape.
All HVAC penetrations in air barriers (to the exterior or unconditioned space) are to be no larger than _____ the penetration object.
1”
All metal ductwork is to be mechanically fastened with what?
Screws (tape is not acceptable)
Flexible ducts are attached in what way?
First attaching the inner liner to the collar with mastic then using plastic Panduit straps tightened with an approved manufacture’s tool.
All ductwork outside conditioned air space is to be completely insulated to a minimum _____?
What is to be strapped to the collars?
R-6
Insulation
Flexible ductwork is not to be in direct contact with _______?
Drywall (ceiling)
All unused openings on the air handler should be plugged with what?
A plastic or an approved plug, no tape.
All HVAC components should be air sealed at all joints and corners with what?
A Shea approved mastic. Including all pre-fabricated joints.
Flexible duct in UNCONDITIONED space are not to be installed in cavities smaller than what?
Smaller than the outer duct diameter.
Flexible duct in CONDITIONED space are not to be installed in cavities smaller than what?
Smaller than the inner duct diameter.
A Shea Family Fresh Air Intake ventilation system is to be installed , filtered and with what?
A means of occupant control
The Fresh Air intake duct is to be insulated to a minimum of what R-value?
R-6
The Fresh Air intake duct shall terminate where and have what type of damper?
Terminate to the exterior of the home.
Have a manual damper, or some type of occupant control.
The Fresh Air intake vent shall have a rodent/insect screen with what size mesh?
1/2” or less
