Ashrae Standard 62.1-2010 - LG Multi V mini Engineering Manual

ASHRAE STANDARDS SUMMARY

ASHRAE Standard 62.1-2010

ASHRAE 62.1-2010—Ventilation for Acceptable Indoor Air Quality
Over the past twenty years, publications have documented that the occupant's well being, productivity, and comfort is significantly impacted
if the building is not properly ventilated. Providing proper ventilation air directly and significantly increases a building's overall energy
consumption and operating costs. In an effort to reduce medical and legal costs as well as the cost associated with personnel turnover,
occupant companies and human resource personnel today consider the lease premium associated with tempering and cleaning ventilation
air relatively insignificant. Standard 62.1-2010 is known as the Indoor Air Quality (IAQ) Performance Standard. The standard documents
key strategies for maintaining minimum IAQ, including limiting the introduction of potential contaminants into the occupied areas originating
from indoor and outdoor sources. The standard also addresses the proper introduction of ventilation (outdoor) air into the building using two
methods:
1. The Ventilation Rate Procedure (VRP) is a prescriptive approach that sets minimum design requirements when sizing the building's venti-
lation equipment including:
• Outdoor air quality requirements
• Treatment procedures used if the outdoor air is deemed contaminated
• Volume of outdoor air that must be introduced to the occupied areas of commercial, institutional, vehicular, industrial, and residen-
tial buildings
2. The IAQ compliance procedures:
The standard, under section 6.3, allows the designer to significantly reduce the ventilation air volume required using the VRP procedure
when high efficiency air filtration products designed to remove particulate and gas phase contaminates are specified. This procedure is
a performance-based design approach where the indoor air quality in the occupied areas is actively monitored using sensing devices.
When the IAQ falls below specified levels, the volume of outside air introduced into the building is modified.*
There are three methods used for ventilating buildings:
1. Mechanical "active" ventilation
2. Natural "passive" ventilation
3. Mixed-mode "active and passive" ventilation
The intent of this discussion is to provide guidance for the designer when applying active mechanical ventilation methods in conjunction with
Multi V variable refrigerant flow equipment. Multi V indoor units are designed for quiet operation and room air recirculation. Inherently, quiet
fans cannot produce a significant amount of static pressure. Thus, Multi V indoor units do not have the capability to "draw" ventilation air.
Ventilation air must be "pushed" to the indoor unit. In all designs, the outside air must be introduced using a separate fan that is specifically
designed for the task.
There are three methods to mechanically introduce outside air into individually occupied areas and rooms. When considering which method
to use, the designer should choose a design that minimizes potential maintenance costs and operational problems.
Decoupled Ventilation Air: This is the preferred method to use with all LG air conditioning products. From a common
Method 1:
outside air inlet, filter and pre-treat the air temperature to room neutral conditions, and duct the ventilation air to the ceiling
or wall registers in each breathing zone. Use this method when cost and operational problems are a priority. It can be
used in all applications and in conjunction with any type of Multi V indoor unit. When using Method 1 and the outside air
pre-treatment device experiences component failure due to filtering, heating, or cooling, the occupant will readily notice
the resulting untreated air and can notify the building engineer of the problem. More importantly, the failure is less likely to
impact the Multi V system.
USGBC. 2009. Green Building Design & Construction. Washington, DC. USGBC Staff. Page 535
* Amercian Society of Heating, Refrigeration and Air Conditioning Engineers, Inc. (ASHRAE) 62.1-2010, sections 6.2 and 6.3
90 U.S. DESIGN STANDARDS
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