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Page 25
14ACX SERIES
1. Confirm proper airflow across coil using figure 19.
2. Compare unit pressures with table 4, Normal
Operating Pressures.
USE WEIGH-IN METHOD
Weigh-in or remove refrigerant
based upon line length
SCº (Subcooling) Values (F:+/−1.0° [C: +/−0.6°])
BLOCK OUTDOOR COIL: [sometimes necessary with lower
temperatures] Use cardboard or plastic sheet to restrict the
airflow through the outdoor coil to achieve pressures from
325−375 psig (2240−2585 kPa). Higher pressures are needed
to check charge. Block equal sections of air intake panels and
move coverings sideways until the liquid pressure is in the
above noted ranges.
3. Set thermostat to call for heat (must have a cooling load
between 70-80ºF (21−26ºC)
4. Connect gauge set
5. Measure outdoor ambient temperature
6. When heat demand is satisfied, set thermostat to call for
cooling
7. Allow temperatures and pressures to stabilize.
NOTE − If necessary, block outdoor coil to maintain 325
− 375 psig.
8. Record liquid line temperature:
LIQº = ______
9. Measure liquid line pressure and use the value to
determine saturation temperature (see table 3):
SATº = ______
10. Subtract to determine subcooling (SCº):
SATº_____ − LIQº _____ = SCº _____
11. Compare results with table below.
MORE or
LESS
If refrigerant is added or
removed, verify charge using
the Approach Method.
64ºF (17.7ºC)
and below
65ºF (18.3ºC)
and above
CARDBOARD OR
PLASTIC SHEET
ABOVE or
BELOW
If value is MORE than shown,
remove refrigerant.
If value is LESS
than shown, add
refrigerant.
ºF (ºC)* −018 −024 −030 −036 −041 −042 −047 −048 −059/−060
65 (18)
10 (5.6) 10 (5.6) 11 (6.1) 13 (7.2) 9 (5.0) 10 (5.6) 6 (3.3) 8 (4.4) 8 (4.4)
75 (24)
6 (3.3) 7 (3.9) 8 (4.4) 9 (5.0) 7 (3.9) 7 (3.9) 6 (3.3) 8 (4.4) 7 (3.9)
85 (29)
6 (3.3) 8 (4.4) 6 (3.3) 7 (3.9) 7 (3.9) 8 (4.4) 6 (3.3) 8 (4.4) 8 (4.4)
95 (35)
6 (3.3) 9 (5.0) 6 (3.3) 8 (4.4) 7 (3.9) 8 (4.4) 6 (3.3) 8 (4.4) 7 (3.9)
105 (41)
10 (5.6) 9 (5.0) 7 (3.9) 9 (5.0) 7 (3.9) 8 (4.4) 6 (3.3) 8 (4.4) 6 (3.3)
115 (45)
10 (5.6) 10 (5.6) 8 (4.4) 10 (5.6) 6 (3.3) 7 (3.9) 5 (2.8) 7 (3.9) 6 (3.3)
*Temperature of air entering outdoor coil.
Figure 23. HFC−410A Subcooling TXV Charge