Penetrations for gas and electrical must be _____ tight
water
Curb height for roof top unit varies depending on ?
regional snow load
A curb is roofed in to ensure a water tight _____
seal
The lip of the RTU must slip over top of the curb to prevent water from being sucked in by the ____
fan
what is put around the curbs perimeter and duct compartments to ensure an airtight seal?
weather stripping
Traps are a ______ break to allow water to flow in a _______ pressure
vacuum, negative
Condensate trap prevents ___ from being sucked back into the fan compartment in a draw thru
air
Many codes require a minimum of ___feet without putting up railings or fall protection anchors
10 feet
An advantage of RTU’s is the ease to add ____ ___ into the building
fresh air
How can we provide free cooling during winter months?
An economizer
- An economizer turns the mechanical cooling ___
- It will open the outside air dampers and allow close to ___% air in
- Standard cooling air is typically around __F
- If the outdoor air temperature gets too warm the compressor will energize and the dampers will return to a ______ position
- off
- 100%
- 55F
- minimum
If air coming in is at 100% relative humidity, will it to be moist air inside?
no because it is warming up and molecules spread out
RTU’s: Economizers;
- It is critical the control system on the _______ is set up properly
- complaints include; name 3
- It is important to set up _______ positions to allow the correct % of fresh air to enter the building
- economizer
- cost, draft, stuffy
- minimum
