Refrigerant Piping Insulation - LG MULTI F Engineering Manual

VERTICAL-HORIZONTAL INDOOR UNITS
Installation and Best Layout Practices
Drain Piping Specifications
• Drain piping must have downward gradient of at
least 1/50 to 1/100; to prevent reverse flow, slope
should not be straight up and down.
• Do not damage the drain port on the indoor unit
when connecting the field-supplied drain piping.
Figure 233:Close up of Drain Piping Connection.
Drain Piping Insulation
Unit
Gaps Should Not Be Present Drain Hole
Insulating the Refrigerant and
Drain Piping

Refrigerant Piping Insulation

Field-installed vapor and liquid refrigerant piping lines must
be properly and completely covered in insulation (up to the
indoor unit piping connections) and must comply with federal,
state, and local requirements. Any exposed piping may gener-
ate condensate or will cause burns if touched. Insulation for
this field-installed refrigerant piping must have a minimum
heat resistance of 248°F.
Vertical-horizontal air handling indoor units have been tested
under and meet the requirements of the "KS Conditions." If
the indoor unit is installed and is operated at an extended
period in a highly humid environment (dew point tempera-
ture >73°F), however, condensate will form. To prevent this
phenomenon, install adiabatic glass wool insulation with a
thickness of 7/16 to 13/16 inches thick. Also, install glass
wool insulation on all indoor unit that are located in the ceiling
plenum.
Drain Piping Insulation
Drain piping must have insulation a minimum of 7/32 inches
thick.
Figure 237:Close Up of Refrigerant Piping Connection Insulation.
Refrigerant Piping Insulation (Field Supplied)
Insulation Clip (Field Supplied)
Gaps Should Not be Present
168 | VERTICAL-HORIZONTAL
Field-Installed U-Trap Specifications
A ≥ 2-9/16 inches
B ≥ 2C
C ≥ 2 x SP
SP = External Pressure in. WG
Example:
(Field Supplied)
External Pressure= 0.4 in WG
Drain Piping
A ≥ 2-9/16 inches
(Field Supplied)
B ≥ 1-7/12 inches
C ≥ 19/24 inches
Refrigerant Piping Insulation
(Field Supplied)
Overlap Piping Insulation
Due to our policy of continuous product innovation, some specifications may change without notification.
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To prevent leaks cause by a block in the intake air filter, install a U-Trap.
Figure 235:Vertical Primary and
Secondary Drain Layout.
Drain Access Hole
Proper Trap (Field Supplied Kit
Main Drain with Suitable Trap. (Field-Supplied
Trap with Sufficient Depth Can Be Used.
Standard Size P-Traps Cannot Be Used.
Figure 238:Insulating the Refrigerant Piping and Refrigerant Piping
Connections.
Connection for Liquid Piping
Refrigerant Piping
Insulation (Field Supplied)
Insulation Zip Tie (Field Supplied)
Refrigerant Piping Insulation (Field
Supplied)
Connection for Vapor Piping
MULTI
MULTI
Figure 234:Installing the U-Trap.
B
C
U-Trap
A
Figure 236:Horizontal Primary and
Secondary Drain Layout.
Air Filter Cover
Supplementary Drain with a
Can Be Used)
F
F
MAX
3/4-inch Connector