Lennox KGB Series User Manual

Page 59
B-Refrigerant Charge and Check - Fin/Tube Coil
KG/KC 024S, 030S, 036S, 048S, 060S, 074S, 090S
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, re
claim 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 operat
ing.
3- Use a thermometer to accurately measure the outdoor
ambient temperature.
4- Apply the outdoor temperature to table 15-21 to deter
mine normal operating pressures. Pressures are list
ed for sea level applications at 80
5F dry bulb and 675 F
wet bulb return air.
5- Compare the normal operating pressures to the pres
sures 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.
S Add or remove charge in increments.
S Allow the system to stabilize each time refrigerant
is added or removed.
7- Use the following approach method along with the nor
mal operating pressures to confirm readings.
TABLE 15 580942-01
KGB/KCB024S Fin/Tube - W & W/O Reheat
Outdoor Coil
Entering Air Temp
DIscharge
+
10psig
Suction +5
psig
65° F 213 140
75° F 248 142
85° F 285 144
95° F 328 145
105° F 377 146
115° F 431 148
TABLE 16 580943-01
KGB/KCB030S Fin/Tube - W & W/O Reheat
Outdoor Coil
Entering Air Temp
DIscharge
+
10psig
Suction +5
psig
65° F 222 145
75° F 255 147
85° F 295 148
95° F 341 149
105° F 389 151
115° F 443 153
TABLE 17 580944-01
KGB/KCB036S Fin/Tube - W & W/O Reheat
Outdoor Coil
Entering Air Temp
DIscharge
+
10psig
Suction +5
psig
65° F 234 135
75° F 269 140
85° F 310 144
95° F 355 145
105° F 404 148
115° F 458 152
TABLE 18 580945-01
KGB/KCB048S Fin/Tube - W & W/O Reheat
Outdoor Coil
Entering Air Temp
DIscharge
+
10psig
Suction +5
psig
65° F 252 130
75° F 290 135
85° F 332 138
95° F 378 141
105° F 427 143
115° F 484 146
TABLE 19 580946-01
KGB/KCB060S Fin/Tube - W & W/O Reheat
Outdoor Coil
Entering Air Temp
DIscharge
+
10psig
Suction +5
psig
65° F 244 138
75° F 280 140
85° F 322 142
95° F 367 143
105° F 417 144
115° F 472 148
TABLE 20 580947-01
KGB/KCB074S Fin/Tube - W & W/O Reheat
Outdoor Coil
Entering Air Temp
DIscharge
+
10psig
Suction +5
psig
65° F 267 140
75° F 301 142
85° F 349 144
95° F 397 145
105° F 448 146
115° F 504 148
TABLE 21 580948-01
KGB/KCB090S Fin/Tube - W & W/O Reheat
Outdoor Coil
Entering Air Temp
DIscharge
+
10psig
Suction +5
psig
65° F 272 117
75° F 311 123
85° F 356 127
95° F 406 133
105° F 457 137
115° F 513 138

Lennox KGB Series Specifications

General

Brand	Lennox
Model	KGB Series
Category	Heat Pump
Language	English