Page 43
507348-04 12/2015
C-Refrigerant Charge and Check - Fin/Tube Coil
KGA/KCA 036 to 060
WARNING-Do not exceed nameplate charge under
any condition.
This unit is factory charged and should require no further
adjustment. If the system requires charge, reclaim the
charge, evacuate the system and add required
nameplate charge.
NOTE - System charging is not recommended below
60°F (15°C). In temperatures below 60°F (15°C) , the
charge must be weighed into the system.
If weighing facilities are not available, or to check the
charge, use the following procedure:
1- Attach gauge manifolds and operate unit in cooling
mode until system stabilizes (approximately five
minutes). Make sure outdoor air dampers are closed.
2- Use a thermometer to accurately measure the
outdoor ambient temperature.
3- Apply the outdoor temperature to tables 7 through 12
to determine normal operating pressures.
4- Compare the normal operating pressures to the
pressures obtained from the gauges. Minor
variations in these pressures may be expected due to
differences in installations. Significant differences
could mean that the system is not properly charged
or that a problem exists with some component in the
system. Correct any system problems before
proceeding.
5- If discharge pressure is high, remove refrigerant from
the system. If discharge pressure is low, add
refrigerant to the system.
Add or remove charge in increments.
Allow the system to stabilize each time
refrigerant is added or removed.
6- Use the following approach method along with the
normal operating pressures to confirm readings.
TABLE 7
KGA 036S -3 & LOWER; KCA 036S -2 & LOWER
NORMAL OPERATING PRESSURES
Outdoor Coil
Entering Air Temp
Discharge
+
10 psig
Suction + 5
psig
655 F 269 146
755 F 311 148
855 F 357 150
955 F 407 152
1055 F 466 155
1155 F 532 157
TABLE 8
KGA 036S -4 & HIGHER; KCA 036S -3 & HIGHER
NORMAL OPERATING PRESSURES
Outdoor Coil
Entering Air Temp
Discharge
+
10 psig
Suction + 5
psig
65° F 275 137
75° F 312 139
85° F 353 142
95° F 399 146
105° F 450 149
115° F 506 150
TABLE 9
KGA 048S -3 & LOWER; KCA 048S -2 & LOWER
NORMAL OPERATING PRESSURES
Outdoor Coil
Entering Air Temp
Discharge
+
10 psig
Suction + 5
psig
65° F 280 142
75° F 321 144
85° F 365 147
95° F 414 149
105° F 467 151
115° F 526 153
TABLE 10
KGA 048 -4 & HIGHER; KCA 048S -3 & HIGHER
NORMAL OPERATING PRESSURES
Outdoor Coil
Entering Air Temp
Discharge
+
10 psig
Suction + 5
psig
65° F 279 132
75° F 319 136
85° F 360 140
95° F 404 144
105° F 454 147
115° F 506 148
TABLE 11
KGA 060S -4 & LOWER; KCA 060S -3 & LOWER
NORMAL OPERATING PRESSURES
Outdoor Coil
Entering Air Temp
Discharge
+
10 psig
Suction + 5
psig
65° F 265 136
75° F 302 137
85° F 344 139
95° F 391 142
105° F 442 146
115° F 499 148
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