Ceiling Cassette Air Handler Installation Manual
CAUTION
• DO NOT mix anything other than the specied refrigerant, such as air, etc., inside the refrigerant
circuit.
• Execute heat insulation work completely on both sides of the gas piping and liquid piping.
Otherwise, this can sometimes result in water leakage. (When using a heat pump, the
temperature of the gas piping can reach up to approximately 248° F. Use insulation which is
suciently resistant.)
• Also, in cases where the temperature and humidity of the refrigerant piping sections might
exceed 86° F or Rh80%, reinforce the refrigerant insulation (3/4" or thicker). Condensation may
form on the surface of the insulating material.
• Before rigging tubes, check which type of refrigerant is used.
• Use a pipe cutter and are suitable for used refrigerant.
• Only use annealed material for are connections.
• If the refrigerant gas leaks during the work, ventilate the area. A toxic gas is emitted by the
refrigerant gas being exposed to a re.
• Make sure there is no refrigerant gas leak. A toxic gas may be released by the refrigerant gas
leaking indoor and being exposed to ames from an area heater, cooking stove, etc.
• Refer to the Fig 5.1 for the dimensions of are nuts spaces and the appropriate tightening
torque. (Over-tightening may damage the are and cause leaks.)
• Check whether the height drop between the indoor unit and outdoor unit, and the length of
refrigerant pipe meet the following requirements in Fig 5.2:
The type of models Capacity
(Btu/h)
Max.allowable
piping length
Max.allowable
piping height
R410A inverter 12K 82ft 32.8ft
Split type air conditioner 18K 98.4ft 65.6ft
Fig 5.2
Fig 5.1
Pipe
gauge
Flaring
torque
Flare dimension
(A) (Unit: Inch)
Flare shape
Min. Max.
1/4" 14 ft/ lbs 0.33 0.34
3/8" 18 ft/ lbs 0.52 0.53
1/2" 26 ft/ lbs 0.64 0.65
5/8" 34 ft/ lbs 0.76 0.78
R0.4~0.8
45
°
±
2
90
°
±
4
A
Page 12
Revised 5/14/2020
5
Refrigerant Piping Installation
WARNING
All eld piping must be provided by a licensed refrigeration technician and must comply with the
relevant local and national codes
Refrigerant Piping
Installation