Samsung Fresh Access AN035NSEDAV/AA, Руководство по установке

Страница: 7 / 45

Exhaust air ducting
The stale air exhaust system is used to draw air from the points in the building where the worst air quality problems occur.
(See installation examples in the manual.)
Installing ducts to / from inside
Direct connection to furnace/ air handler return duct
• Should you wish to hard duct the supply air directly into the cold air return of the HVAC systems, remember to check the airflow
balance of the ERV with the HVAC systems fan both “on” and “off” to determine that it does not imbalance the ERV more than
10%. Make sure you respect the minimum distance from the supply air in of the ERV and the HVAC systems.
• It may be necessary to install a separate fresh air supply ductwork system if the cooling is other than forced air.
When installing an ERV, the designer and installer should be aware of local codes that may require smoke detectors and/or
firestats in the HVAC or ERV ductwork.
Because an ERV is designed to bring fresh air into the building, structures may require supply voltage interrupt when smoke or
flame sensors are triggered, or when a central fire alarm system is activated.
To maximize airflow in the ductwork system, all ducts should be kept short and have as few bends or elbows as possible. Forty-
five degree are preferred to 90
o
elbows. Use “Y” tees instead of mitered tee whenever possible.
All duct joints must be fastened with screws or duct sealant and wrapped with a quality duct tape to prevent leakage. Aluminum
foil duct tape is recommended.
Supply air ducting
In buildings without a forced air HVAC systems, fresh air should be supplied to all habitable areas. It should be supplied from
high wall or ceiling locations. Grilles that diffuse the air comfortably such as grille {MGE (metal) or CG (plastic)} grilles with
"coanda effect" are recommended.
Optional inline duct heaters may be used to add heat if required.
A The duct’s airflow velocity
is generally
measured with a
magnehelic gauge
and a pitot tube.
• To avoid airflow
turbulence and incorrect
readings, the airflow
velocity should be
measured on steel
ducting a minimum of 3
duct cross-sections from
the unit or elbow and
before any transition.
• The balancing procedure consists of measuring the exhaust air leaving the system and the supply air entering the system and
ensuring that these two are equal. A deviation of 10% or less is acceptable.
Airflow balancing
A
*
Pitot tube and gauge
A professional air balancer should be contacted to commission the system properly. A skilled HVAC Tech may
complete the balance of air providing they possess the proper equipment.
7