Installation Instructions

For optimum performance, the piston should be sized to match
the recommendation from the outdoor unit manufacturer. If the
outdoor unit manufacturer does not recommend a piston size,
refer to the piston size chart below.
When changing ADP pistons, refer to Figure 1 and use the
following procedure:
 Loosen hex nut located on liquid line and separate from
distributor assembly.
 Remove the existing piston from inside the distributor
assembly.
 Insert the desired piston into the distributor assembly.
 Inspect Teflon O-ring and replace if damaged. Ensure
Teflon O-ring is in place.
 Re-install hex nut to body and torque to 10 ft-lbs.
METERING DEVICE
FIGURE 1
Piston Size
R-22 R-410A
Ton
Piston
Size
Part #
Piston
Size
Part #
1 41 100000035 41 100000035
1.5 53 100000036 49 100000049
2 59 100000037 53 100000036
2.5 67 100000039 59 100000037
3 73 100000041 67 100000039
3.5 80 100000044 73 100000041
4 84 100000045 76 100000042
5 93 100000047 93 100000047
Coils are suited for R-22 and R-410A refrigerants and can be
used with or without a TXV. Replacement TXV part numbers
are listed below; see kit instructions for change out or
installation. Remove sensing bulb from suction line during
brazing to prevent damage from occurring. For optimum
performance, attach and insulate the bulb at a 10 to 2 o’clock
position outside of the cabinet to the main suction line no more
than one foot from the suction line connection. If necessary,
the bulb can be installed on a vertical suction line. In this
instance, the bulb must be placed before any trap, with the
bulb’s capillary tube facing upward. When changing a system
from AC to heat pump or heat pump to AC, check the current
TXV specifications to determine if a TXV replacement is
required. If the evaporator coil contains a non-bleed TXV
and is used with a condensing unit containing a
reciprocating compressor, a hard start mechanism will be
required on the outdoor unit.
R-22 TXV Part Numbers
18-36 MBTUH Bleed A/C 65540600
42-60 MBTUH Bleed A/C 65540700
18-36 MBTUH Non-Bleed A/C 99167501
42-60 MBTUH Non-Bleed A/C 99167502
18-36 MBTUH Non-Bleed A/C-HP 65616201
42-60 MBTUH Non-Bleed A/C-HP 65616202
IMPORTANT
When changing the metering device, ensure the meter-
ing device matches the refrigerant type and capacity of
the condensing unit. Failure to do so will result in poor
performance and possible compressor damage. All
coils must be matched properly as listed in the AHRI
directory.
R-410A TXV Part Numbers
18-36 MBTUH Non-Bleed A/C 65026401
42-60 MBTUH Non-Bleed A/C 65026400
18-36 MBTUH Non-Bleed A/C-HP 65616601
42-60 MBTUH Non-Bleed A/C-HP 65616602
18-36 MBTUH Bleed A/C 67304001
42-60 MBTUH Bleed A/C 67304002
18-36 MBTUH Bleed A/C-HP 67304101
42-60 MBTUH Bleed A/C-HP 67304102
Side View of Piston Orifice
Teflon O-Ring Seal
ADP Piston
Distributor Assembly
Coil Cabinet
Hex Nut
Liquid Line