Lennox KGC092 User Manual

Page 24
D-Refrigerant Charge and Check - Fin/Tube Coil
WARNING-Do not exceed nameplate charge under
any condition.
This unit is factory charged and should require no further
adjustment. If the system requires additional refrigerant,
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:
IMPORTANT - Charge unit in standard cooling mode.
1- Attach gauge manifolds and operate unit in cooling
mode with economizer disabled until system
stabilizes (approximately five minutes). Make sure
outdoor air dampers are closed.
2- Check each system separately with all stages
operating.
3- Use a thermometer to accurately measure the
outdoor ambient temperature.
4- Apply the outdoor temperature to table 11-14 to
determine normal operating pressures. Pressures
are listed for sea level applications at 80
5F dry bulb
and 67
5F wet bulb return air.
5- 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.
6- 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.
7- Use the following approach method along with the
normal operating pressures to confirm readings.
TABLE 11 581129-01
KGC/KCC092S Fin/Tube - W & W/O Reheat
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1 CIRCUIT 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
65°F 270 128 255 140
75°F 310 131 295 146
85°F 352 133 338 151
95°F 401 136 388 155
105°F 453 140 433 160
115°F 511 145 488 162
TABLE 12 581130-01
KGC/KCC102S Fin/Tube - W & W/O Reheat
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1 CIRCUIT 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
65°F 269 128 276 138
75°F 308 132 314 142
85°F 350 135 359 146
95°F 396 139 407 149
105°F 447 141 458 152
115°F 502 146 513 156
TABLE 13 581131-01
KGC/KCC120S Fin/Tube - W & W/O Reheat
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1 CIRCUIT 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
65°F 263 125 262 132
75°F 301 125 304 140
85°F 341 123 348 146
95°F 386 125 394 152
105°F 440 130 447 156
115°F 492 139 499 158
TABLE 14 581132-01
KGC/KCC150S Fin/Tube - W & W/O Reheat
Outdoor
Coil
Entering
Air Temp
CIRCUIT 1 CIRCUIT 2
Dis
charge
+
10 psig
Suction
+
5 psig
Dis
charge
+
10 psig
Suction
+
5 psig
65°F 281 121 283 137
75°F 320 125 325 141
85°F 364 129 370 143
95°F 407 132 415 145
105°F 456 135 464 148
115 °F 508 139 517 151

Lennox KGC092 Specifications

General

Brand	Lennox
Model	KGC092
Category	Air Conditioner
Language	English