Multi F Engineering Manual

Power Wiring / Communications Cable Guidelines
FOUR-WAY CEILING-CASSETTE INDOOR UNITS
Installation and Best Layout Practices
• 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 required 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.
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.
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 will cause the drain pan to overflow inside the indoor unit).
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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.
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A voltage drop will cause the following problems:
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• Compressor will not receive the proper starting current.
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132 | CEILING-CASSETTE
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI
F
MAX
MULTI
F