DOOR TEMPERATURE ˚F
75 80 85 90 95 100 105 110 115
EXAMPLE: SUCTION PRESSURE=65#. SUCTION TEMP=70˚F
WHICH GIVES AN ACTUAL SUPERHEAT OF 32˚F.
OD TEMP=90˚F➀ ID TEMP=80˚F➁
INTERSECTION OF ID AND OD TEMPS➂ OCCUR ON THE
12˚F SUPERHEAT LINE➃.
ADD CHARGE TO OBTAIN 12˚ SUPERHEAT.
D ON 400 CFM/TON INDOOR AIRFLOW AND
IDITY, USE ON SYSTEMS THAT COOL WITH FCCV
HEAT CHARGING CHART
LIMIT LINE
ion temperature at OD quick attach, ID & OD temps. Determine from
for the ID & OD temp. Example indicates 12˚ superheat. Determine
ed running conditions.
OK
●
more than 5˚ below chart value remove refrigerant
add refrigerant
●
if below 5˚ limit line, do not add refrigerant
From Dwg. 21C141108 Rev. 0
1
3
Dwg. No. 4TWR2036-SF-1 Page E-757-000
WIRING DIAGRAM
A150999P05 REV. 0
LOWER CURVE
MIDDLE CURVE
UPPER CURVE
2010 3025 40 8060
60
50
40
30
25
20
15
10
0
REFRIGERANT
LINE LIFT
(FEET)
TOTAL REFRIGERANT LINE LENGTH (FEET)
CHARGING CURVE SELECTION CHART
TXV REFRIGERANT CHARGING CURVE
For charging outdoor units with R-410A refrigerant at above 65˚F
outdoor temperature in cooling mode and with indoor TXV.
LIQUID PRESSURE (PSIG.)
130120110100908070
600
550
500
450
400
350
300
250
200
LIQUID TEMPERATURE (˚F.)
ADD REFRIGERANT
REMOVE REFRIGERANT
1.
2.
3.
4.
5.
6.
Measure Liquid Line Temperature and
Refrigerant Pressure at service valves.
Determine total refrigerant pipe length
and height (lift) if indoor section is above
the condenser. Plot the intersection of
the two points on the Curve Selection
Chart to determine which curve to use.
Plot the pressure and temperature on
the TXV Charging Curve.
If the lines cross above the curve remove
refrigerant, if below curve add refrigerant.
Whenever charge is removed
or added, the system must
be operated for a minimum
20 minutes to stabilize before
additional measurements can
be made.
When system is correctly
charged refer to System
Performance Curves to verify
charge and performance.
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