Multi F Engineering Manual

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). Any exposed piping will generate condensate or

will cause burns if touched. Insulation for this field-installed refriger-

ant piping must have a minimum heat resistance of 248°F.

Duct (low static) 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 temperature >73°F), however, condensate will form. To

prevent this phenomenon, install adiabatic glass wool insulation with

a thickness or 13/32 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.

DUCT (LOW STATIC) INDOOR UNITS

Installation and Best Layout Practices

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Liquid Piping

Connection

Insulation for Refrigerant Piping

(Field-Supplied)

Vapor Piping Connection

Insulation

(Field-Supplied)

Clamp for Insulation

(Field-Supplied)

Ensure no gaps are present.

Overlap the Insulation at the

Connection

Insulation for Refrigerant Piping

(Field-Supplied)

Insulation for Field-Installed Piping

(Field-Supplied)

Insulating the Refrigerant and Drain Piping

Ensure all piping is insulated. Exposed piping can cause burns

if touched.

DUCT (LOW STATIC) | 89

Ceiling-Concealed Duct (Low Static)

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