Cautions For Refrigerant Leaks; Refrigerant Leaks - LG MULTI F Installation Manual
Multi-zone heat pump systems
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MULTI
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MULTI
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Cautions for Refrigerant Leaks
ASHRAE Standards 15 and 34 offer guidelines that address refrigerant safety and the maximum allowable concentration of refrigerant in an
occupied space. Refrigerant will dissipate into the atmosphere, but a certain volume of air is required for this to occur safely. For R410A re-
frigerant, the maximum allowable concentration is 0.026 lbs./ft
occupancy allow half of that concentration.
ASHRAE Standards 15 and 34 assume that if a system develops a leak, its entire refrigerant charge will dump into the area where the leak
occurs. To meet ASHRAE Standards 15 and 34, calculate the refrigerant concentration that may occur in the smallest room volume on
the system, and compare the results to the maximum allowable concentration number (see below for information on how to calculate the
refrigerant concentration).
Also consult state and local codes in regards to refrigerant safety.
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Verify the maximum refrigerant concentration level in the space where the indoor unit will be mounted meets the concentration limit for the
application. If the refrigerant leaks and safety limits are exceeded, it could result in personal injuries or death from oxygen depletion.
Note:
Take appropriate actions at the end of HVAC equipment life to recover, recycle, reclaim or destroy R410A refrigerant according to applicable
US EPA rules.
To calculate the potential refrigerant concentration level (RCL):
1. Measure the occupied space dimensions (in feet).
2. Calculate the cubic foot volume of air in the smallest occupied
space. (To obtain a detailed overview of the RCL, perform the
same calculations to the second smallest zone, the third small-
est zone until the RCL is obtained for all zones. Also, pay special
attention to areas such as basements, etc., where refrigerant
cannot dissipate easily.)
3. Divide the refrigerant charge of the Multi Zone system serving the
area in pounds by the results of step 1.
4. If the calculation indicates that the potential refrigerant concen-
tration level is higher than the allowed RCL, increase the cubic
volume of the smallest occupied space or modify the piping
system design.
5. The allowable RCL limit for most applications must be equal to
or less than 0.026 lbs./ft
. In special occupied spaces, however,
3
such as hospitals and nursing homes where occupants may have
limited mobility, the allowable RCL limit is cut in half. See ASHRAE
Standard 34-2007 and local codes for detailed information.
American Society of Heating, Refrigeration and Air Conditioning Engi-
1
neers, Inc. (ASHRAE). Atlanta, GA. ASHRAE, Inc. Information about
ASHRAE Standard 15-2010 / 34-2010 and addenda current as of the
date of this publication.
CAUTIONS FOR REFRIGERANT LEAKS
per 1,000 ft
3
1
1
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
of air in an occupied space. Buildings with twenty-four (24) hour
3
Refrigerant Concentration Limit (RCL) Calculations
To calculate total refrigerant amount per system:
Amount of
Amount of
+
Factory-Charged
Additional Re-
Refrigerant per
frigerant Trim
Outdoor Unit
Charge
Total System Refrigerant Charge (lbs.)
RCL (lbs./ft
) =
3
Volume of Smallest Occupied Space (ft
Refrigerant Leaks
Total System
=
Refrigerant
Charge
)
3
53
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