88-A4HP4001-1G-EN 15
Indoor Wet Bulb Temp (F)
Outdoor
Dry
Bulb
Temp.
(F)
50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78
55 7 9 10 11 12 14 15 17 18 20 21 23 24 26 27 29 30
60 5 7 8 9 10 12 13 15 16 18 19 21 22 24 25 27 28 30 31
65 4 6 8 1011131416 17 18 19 2122242527282731
70 5 7 8 101113 14 16 1718 192122242527283031
75 5 6 7 9 10 12 14 16 18 19 21 22 24 26 28 29 31 32
80 4 6 7 9 10 11 12 14 16 18 19 21 23 25 26 28 29 31 33
85 4 6 7 9 10 13 14 16 18 20 21 23 24 26 28 29 30 31 32
90 4 6 8 1011131416182022242527283031
95 4 6 8 101314161820222325 262829
100 6 8 10 12 13 16 18 20 21 23 25 27 29
105 4679111315182022242628
110 4 7 9 11 13 16 18 21 23 26 28
115 6 9 12 14 16 19 21 24 26
Using a digital psychrometer, measure the return air wet-bulb temperature at the unit just before the coil. Also measure the outdoor dry-bulb tem-
perature. Use these temperatures to locate the target superheat on the charging table. Do not attempt to charge the system if these conditions fall
outside of this charging table.
ADD refrigerant to DECREASE total superheat. REMOVE refrigerant to INCREASE total superheat. Always allow 10 to 15 minutes of operature
after any refrigerant or air flow change prior to determining the final superheat.
Fixed Orifice Superheat Charging Table
STEP 9 - Record System Information for refer-
ence.
Record system pressures and temperatures
after charging is complete.
Outdoor model number = _________________
Measured Outdoor Ambient = __________ º F
Measured Indoor Ambient = __________ º F
Measured Liquid Line Temp = __________ º F
The Subcooling Charging method in cooling is not recommended below 55º F outdoor temperature.
The only recommended method of charging at outdoor temperatures below 55º F is weighing in the charge in
heating mode.
STEP 1 - Determine additional charge.
Note: The nameplate charge value represents
the amount of refrigerant shipped in the outdoor
unit and is compatible with 10 feet of AHRI rated
refrigerant lines and the smallest AHRI rated
coil.
Using the method below, find the charge associ-
ated with the additional length of tubing above
10 ft. and record it below.
14.3 Subcooling Charging Below 55º F Outdoor Temp. (In Heating Only)
Measured Suction Line Temp = __________ º F
Liquid Gage Pressure = __________ PSIG
Suction Gage Pressure = __________ PSIG
Weigh-In Method can be used for the initial
installation, or anytime a system charge is being
replaced. Weigh-In Method can also be used
when power is not available to the equipment
site or operating conditions (indoor/outdoor
temperatures) are not in range to verify with the
subcooling charging method.
To Next Page
Loading...
Need help?
General