LG MULTI F Engineering Manual page 148

FOUR-WAY CEILING-CASSETTE INDOOR UNITS
Installation and Best Layout Practices
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). Any exposed piping may generate condensate
or will cause burns if touched. Insulation for this field-installed refrig-
erant piping must have a minimum heat resistance of 248°F.
Drain Piping Insulation
Drain piping must have insulation a minimum of 7/32 inches thick.
Installing the Insulation
1. Overlap the insulation at the connection of the field-installed
piping and the indoor unit piping. Tape together so that no gaps
exist.
2. Secure insulation to the rear piping housing section with vinyl tape.
3. Bundle the piping and drain hose with tape where they meet at the back of the indoor unit frame. Position the drain hose at the bottom of
the bundle (positioning the drain hose at the top of the bundle may cause the drain pan to overflow inside the indoor unit).
Power Wiring / Communications Cable Guidelines
• Follow manufacturer's circuit diagrams in the technical manuals.
• Confirm power source specifications.
• Confirm that the electrical capacity is sufficient.
• Starting current must be maintained ±10 percent of the rated current marked on the outdoor unit name plate.
• Confirm cable thickness specifications.
• It is recommended that a circuit breaker is installed, especially if conditions could become wet or moist.
• Include a disconnect in the power wiring system, add an air gap contact separation of at least 1/8 inch in each active (phase) conductor.
• Loose wiring may cause unit malfunction, or the terminal to overheat and catch fire.
• Terminal screws may become loose during transport. Properly tighten the terminal connections during installation.
A voltage drop may cause the following problems:
• Magnetic switch vibration, fuse breaks, or disturbance to the normal function of an overload protection device.
• Compressor will not receive the proper starting current.
148 | CEILING-CASSETTE Due to our policy of continuous product innovation, some specifications may change without notification.
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Liquid Piping
Connection
Vapor Piping Connection
Figure 206:Insulating the Piping.
Insulation for Refrigerant Piping
(Field-Supplied) Insulation for Field-Installed Piping
Ensure no gaps are present.
F
Insulation for Refrigerant Piping
MULTI
(Field-Supplied)
F
MULTI
Clamp for Insulation
(Field-Supplied)
Insulation
(Field-Supplied)
(Field-Supplied)
Overlap the Insulation at the
Connection
MAX