46
Multi V Ducted Indoor Units
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Refrigerant Safety
Verify the maximum refrigerant concentration in the space where the indoor unit will be mounted meets the concentration limit
allowed by ASHRAE Standards 15-2010 and 34-2010. There is danger of asphyxiation from oxygen displacement.
ASHRAE Standards 15-2010 and 34-2010 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 refrigerant, the maximum allowable concentration of refrigerant is twenty-six (26) lbs. per 1,000 cubic feet of an occupied space.
Buildings with twenty-four (24) hour occupancy allow half of that concentration.
1
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.
1
Also consult state and local codes in regards to
refrigerant safety.
1
Information about ASHRAE Standard 15-2010 / 34-2010 and addenda current as of the date of this publication.
INSTALLATION
Piping Connections
Table 22: Ducted Indoor Unit Pipe Connections (in.).
Size /
Chassis
Liquid Line Vapor Line Condensate Pump Drain Gravity Drain (Plugged)
Dia.
1
Conn. L14 L17 Dia.
1
Conn. L13 L16 Dia.
1
Conn.
2
L11 L18 Dia.
3
Conn.
2
L12 L15
Mid-Static and High-Static Ducted Indoor Units
7-18 MA 1/4 45° Flare 10-13/32 7-7/32 1/2 45° Flare 8-21/32 5-15/32 1.0 Plain 14-9/32 6-19/32 1.0 3/4 MPT 9-1/4 7/8
24 MA 3/8 45° Flare 10-3/8 7-11/32 5/8 45° Flare 8-17/32 5-21/32 1.0 Plain 14-7/32 6-19/32 1.0 3/4 MPT 9-9/32 27/32
7-18 M1 1/4 45° Flare 10-13/32 7-7/32 1/2 45° Flare 8-21/32 5-15/32 1.0 Plain 14-9/32 6-19/32 1.0 3/4 MPT 9-1/4 7/8
24 M1 1/4 45° Flare 10-13/32 7-7/32 5/8 45° Flare 8-21/32 5-15/32 1.0 Plain 14-9/32 6-19/32 1.0 3/4 MPT 9-1/4 7/8
24-42 M2 3/8 45° Flare 10-13/32 7-7/32 5/8 45° Flare 8-21/32 5-15/32 1.0 Plain 14-9/32 6-19/32 1.0 3/4 MPT 9-1/4 7/8
28-54 M3 3/8 45° Flare 7-15/16 7-3/8 5/8 45° Flare 5-5/32 5-1/2 1.0 Plain 12-23/32 6-27/32 1.0 3/4 MPT 6-3/4 1-3/32
36-76 B8 3/8 Brazed 2-1/2 5-1/2 3/4 Brazed 5-1/4 4-3/4 1.0 Plain 7-5/8 6-7/8 1.0 3/4 MPT 7-5/8 1-1/4
96 B8 3/8 Brazed 2-1/2 5-1/2 7/8 Brazed 5-1/4 4-3/4 1.0 Plain 7-5/8 6-7/8 1.0 3/4 MPT 7-5/8 1-1/4
Low-Static Convertible Ducted Indoor Units
Frame
Liquid Line Vapor Line Condensate Pump (Primary) Auxiliary Drain Connection
Dia.
1
Conn. L6 L9 Dia.
1
Conn. L7 L10 Dia.
1
Conn.
2
L5 L11 Dia.
1
Conn.
2
L20 L21
L1 1/4 45° Flare 3-7/8 7-1/4 1/2 45° Flare 3-1/2 4-1/2 1.0 Plain 2 11-1/2 1.0 Plain 6-3/8 9-3/4
L2 1/4 45° Flare 3-7/8 7-1/4 5/8 45° Flare 3-1/2 4-1/2 1.0 Plain 2 11-1/2 1.0 Plain 6-3/8 9-3/4
L3 3/8 45° Flare 3-7/8 7-1/4 5/8 45° Flare 3-1/2 4-1/2 1.0 Plain 2 11-1/2 1.0 Plain 6-3/8 9-3/4
1
Inches I.D.
2
Plastic Resin
3
Inches O.D.
Figure 31: High-Static Ducted (B8) Indoor Unit
Piping Connection Dimensions.
Figure 32: Low-Static Convertible Ducted
(L1/L2/L3) Indoor Unit Piping Connection
Dimensions.
L14
L13
L11
Condensate
Pump
(Primary)
Gravity Condensate
Vapor Line
Liquid Line
L12
L18
L17
L16
L15
Vapor Line
Airflo
w
Figure 33: Mid-Static Ducted (MA/M1/M2/M3) and
High-Static Ducted (/M2/M3) Indoor Unit Piping
Connection Dimensions.
L5
L7
L20
L6
L10
L21
L9
L11
Condensate
Auxiliary Drain
Liquid Line
Vapor Line
L18
L16
L15
L17
L13
L12
L14
L11
Condensate
Auxiliary Drain
Liquid Line
Vapor Line
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