Refrigerant Charge - International comfort products R2A3 GKR Series Installation Instructions Manual

REFRIGERANT CHARGE
Figure 13 shows the suggested refrigerant charge
quantities for a 15 foot (4.6m) lineset. If shorter or longer
refrigerant lines or a different indoor coil are used, the
charge will have to be adjusted.
Figure 13 Suggested Refrigerant Charge
Quantity for 15 foot (4.6m) Lineset
Model Number Ibs. (kg)
R2A318GKR 3.56 (1.62)
R2A324GKR 4.08 (1.85)
R2A330GKR 4.11 (1.87)
R2A336GKR 5.35 (2.43)
R2A342GKR 7.01 (3.19)
R2A348GKR 8.88 (4.04)
R2A360GKR 10.52 (4.79)
Suggested charge amount and desired subcooling are
shown on unit rating plate. Charging method is shown on
information plate inside unit.
For TXV, use subcooling method.
For Piston, use superheat method.
To properly check or adjust charge, conditions must be
favorable for subcooling or superheat charging.
Favorable conditions exist when the outdoor temperature
is between 70°F and 100°F (21°C and 38°C), and the
indoor temperature is between 70°F and 80°F (21°C and
27°C). Follow the procedure below.
Weigh in charge according to suggested quantities
shown in Figure 13. Adjust charge by adding or removing
0.6 oz/ft (17 g/mm) of 3/8 liquid line above or below 15 feet
(4.6 m) respectively.
For standard refrigerant line lengths 80 feet (24.4m) or
less, allow system to operate in cooling mode at least 15
minutes. If conditions are favorable, check system
charge by super heat method for fixed metering device
and subcooling method for TXV. If any adjustment is
necessary, adjust charge slowly and allow system to
operate for 15 minutes to stabilize before declaring a
properly charged system.
If the indoor temperature is above 80°F (27°C), and the
outdoor temperature is in the favorable range, adjust
system charge by weight based on line length and allow
the indoor temperature to drop to 80°F (27°C) before
attempting to check system charge by subcooling method
as described above.
If the indoor temperature is below 70°F (21°C), or the
outdoor temperature is not in the favorable range, adjust
charge for line set length above or below 15 feet (4.6m)
only. Charge level should then be appropriate for the
system to achieve rated capacity. The charge level could
then be checked at another time when the both indoor and
outdoor temperatures are in a more favorable range.
NOTE: If line length is beyond 80 feet (24.4m) or greater
than 20 feet (6.1m) vertical separation, See Long Line
Guideline for special charging requirements.
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