32
REFRIGERANT CHARGING
WARNING:
These units are shipped fully charged with R-410A
refrigerant and ready for installation. When a system
is installed according to these instructions, no
refrigerant charging is required. If repairs make it
necessary for evacuation and charging, it should
only be done by qualified, trained personnel
thoroughly familiar with this equipment. Some
local codes require licensed installation/service
personnel to service this type of equipment. Under
no circumstances should the owner attempt to install
and/or service this equipment. Failure to comply
with this warning could result in property damage,
personal injury, or death.
CAUTION:
This unit uses R-410A refrigerant. DO NOT use
any other refrigerant in this unit. Use of another
refrigerant will damage the unit.
The system refrigerant charge can be checked and adjusted
through the service ports provided at the front panel. Use only
gauge lines which have a
Schrader
depression device present to
actuate the valve. Refrigerant charging must be done by qualified
personnel familiar with safe and environmentally responsible
refrigerant handling procedures. Refer to the application notes
and charging charts on pages 33-35
Charging an R-410A unit in AC mode at outdoor
temperatures above 65F.
1. With the system operating at steady-state, measure the liquid
refrigerant pressure in psig at the service valve.
2. Measure the liquid refrigerant temperature in Fahrenheit at
the outlet of the condensor coil.
3. For the temperature measured, determine the required liquid
refrigerant pressure from the appropriate charging charts in
,
.
4. If the pressure measured in step 1 is greater than the required
liquid refrigerant pressure determined in step 3, then there
is too much charge in the system. Remove refrigerant and
repeat steps 1 through 3 until the system is correctly charged.
5. If the pressure measured in step 1 is less than the required
liquid refrigerant pressure determined in step 3, then there
is too little charge in the system. Add refrigerant and repeat
steps 1 through 3 until the system is correctly charged.
Charging Charts & Application Notes
This equipments cooling system contains refrigerant under
high pressure, always use safe practices when servicing the
unit. Always review the factory literature and safety warnings
prior to servicing.
These units are shipped from the factory with the proper
amount and type of refrigerant. Always inspect the unit rating
label to determine the units information prior to working on the
system. Do not mix different refrigerants or charge the unit with
a refrigerant not listed on the unit rating label.
The charging charts Figures 13 - 16 pages 34 - 35 are valid
for a variety of indoor, return air conditions and are most highly
influenced by the outdoor ambient temperature, outdoor fan
operation and the unit operating voltage. Before referencing the
charts below, always make sure that the compressor circuit is
energized on high speed and has stable operation. See
.
As can be seen in the charging charts, the ideal system sub-
cooling can vary over the range of operation. Always reference
the charts to determine the ideal amount of sub-cooling for a
given liquid pressure. Units charged to other values will not
perform at the rated unit efficiency (EER).
To inspect a systems operation, using quality instruments,
match the measured liquid temperature to the units chart. The
measured liquid pressure reading should be within 3% of the
value shown for most installations. For two stage systems,
the charts are valid for compressor operating on high speed.
DO NOT use the charts for a two stage system operating under
a single stage call for cooling.
For systems that are operating with more then a 5% deviation,
inspect the unit for leaks. Always use safe and environmentally
sound methods for refrigerant handling. When repairing system
leakages, always utilize a nitrogen (inert) gas to protect the
refrigerant system and pressure check the repair before re-
charging. Always replace the filter-dryers when performing
any repair to the refrigeration system. After completing the
repairs, evacuate the system to 350-500 microns and weigh in
the refrigerant to the amount specified on the unit rating label.
Summary of Contents for R6GF Series
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