18
Table 2 . Piston size for system combination
Table1. Factory installed piston size for each model. Additional piston sizes are provided in the
ship-with literature bag as necessary.
Model
50
52
56
58
63
65
68
70
73
75
76
83
90
J4AH4P18A1A00AA
X*
J4AH4P24B1A00AA
X*
J4AH4P30A1B00AA
X*
J4AH4P36A1B00AA
J4AH4P42A1C00AA
J4AH4P48A1C00AA
X*
J4AH4P60B1C00AA
X*
This coil comes with a factory installed piston metering device. See Table 1 for factory installed piston
size. Some system combinations will require a different sized piston to be field installed.
Contact your local parts center to order the appropriate MAYORIACHP piston kit for your system
combination.
Use Table 3 for TXV kit part numbers.
A TXV may be required to achieve minimum efficiency ratings or for long refrigerant line set
applications. Reference AHRI for system combination ratings.
Reference Table 4 to charge the system by superheat when using a piston. Reference the outdoor unit
installation guide to change the system by subcooling when using a TXV.
Outdoor Unit Model
J4AC3018A1
J4AC4018A1
J4HP4018A1
J4AC3024A1
J4AC4024A1
J4HP4024A1
J4AC3030A1
J4AC4030A1
J4HP4030A1
J4AC3036A1
J4AC4036A1
J4HP4036A1
Piston Size(R410a)
0.050
0.050
0.050
0.056
0.056
0.056
0.063
0.063
0.063
0.070
0.073
0.068
Indoor Unit Model
J4AH4P18A1A00A
0.050 factory installed
J4AH4P24B1A00A
0.056 factory installed
J4AH4P30A1B00A
0.063 factory installed
J4AH4P36A1B00A
0.073 factory installed
X*
X
X
X*
* means that this piston is pre-installed
X
