Page 19
508336-01 4/2023
CIRUIT 2
OUTDOOR COIL
FIGURE 15
REFRIGERANT CIRCUITS
CIRCUIT 1
OUTDOOR COIL
INDOOR COIL CIRCUIT 1 & 2
ARE INTERLACED
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 normal cooling mode.
1- Attach gauge manifolds to discharge and suction
lines. With the economizer disabled, operate the unit
in cooling mode at high speed using the following
mobile service app menu path:
SERVICE>TEST>COOL>COOL 3
2- Use a thermometer to accurately measure the
outdoor ambient temperature.
3- Apply the outdoor temperature to tables 5 to 7 to
determine normal operating pressures.
Pressures
are listed for sea level applications at 80°F dry bulb
and 67°F wet bulb return air.
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 5
156 Compressor 1 Frequency 56Hz - 581167-01
Outdoor
Coil En
tering
Air Temp
Circuit 1 Circuit 2
Dis. +10
psig
Suc. +5
psig
Dis. +10
psig
Suc. +5
psig
65°F 218 110 232 118
75°F 262 129 279 138
85°F 305 146 319 144
95°F 350 149 365 148
105°F 400 152 416 150
115 ° F 454 155 471 153
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