Page 19
13ACX SERIES
DO NOT CHARGE UNIT
(Results of charging at low
temperatures not reliable)
START: Measure outdoor ambient temperature
USE WEIGH-IN METHOD
Weigh-in or remove refriger-
ant based upon line length
APPº (Approach) Values(F:+/−1.0° [C: +/−0.6°])
1. Confirm proper airflow across coil using Figure
10.
2. Compare unit pressures with Table 3, Normal
Operating Pressures.
3. Set thermostat to call for heat (must have a
cooling load between 70-80ºF (21−26ºC).
4. Connect gauge set.
5. When heat demand is satisfied, set thermostat
to call for cooling.
6. Allow temperatures and pressures to stabilize.
7. Record outdoor ambient temperature:
AMBº =_________
8. Record liquid line temperature:
LIQº = __________
9. Subtract to determine approach (APPº):
LIQº_____ − AMBº _____ = APPº_____
10. Compare results with table below.
Figure 13. HFC−410A Approach TXV Charge
ABOVE or
BELOW
If value is greater than shown (high approach),
add refrigerant; if less than shown (liquid
temperature too close to ambient temperature,
low approach), remove refrigerant.
If refrigerant is added
or removed, retest to
confirm that unit is
properly charged.
ºF (ºC)* −018 −024 −030 −036 −042 −048 −060
Any 4 (2.2) 8 (4.4) 8 (4.4) 11 (6.1) 9 (5.0) 8 (4.4) 9 (5.0)
*Temperature of air entering outdoor coil
64ºF
(17.7ºC) and
Below
65ºF
(18.3ºC) and
Above
DO NOT CHARGE UNIT
(Results of charging at low
temperatures not reliable)
START: Measure outdoor ambient temperature
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.
If value is MORE
than shown, remove
refrigerant.
1. Confirm proper airflow across coil using Figure
10.
2. Compare unit pressures with Table 3, Normal
Operating Pressures.
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 4):
SATº = ______
10. Subtract to determine subcooling (SCº):
SATº_____ − LIQº _____ = SCº _____
11. Compare results with table below.
Figure 14. HFC−410A Subcooling TXV Charge
MORE or
LESS
If value is LESS
than shown, add
refrigerant.
If refrigerant is added
or removed, verify
charge using the
Approach Method.
ABOVE or
BELOW
ºF (ºC)* −018 −024 −030 −036 −042 −048 −060
Any 10 (5.6) 10 (5.6) 9 (5.0) 12 (6.7) 9 (5.0) 9 (5.0) 7 (3.9)
*Temperature of air entering outdoor coil
64ºF
(17.7ºC) and
Below
65ºF
(18.3ºC) and
Above
CARDBOARD OR
PLASTIC SHEET
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