35
CHECKING REFRIGERANT CHARGE
Charge for all systems should be checked against the
Charging Chart inside the access panel cover.
WARNING: The top of the scroll
compressor shell is hot. Touching the compressor top
may result in serious personal injury.
IMPORTANT: Use factory-approved charg-
ing method as outlined on the next 4 pages to ensure
proper system charge.
NOTICE: The optimum refrigerant charge for
any outdoor unit matched with a CFL/CFM/H*L indoor
coil/air handler is affected by the application. Therefore,
charging data has been developed to assist the field
technician in optimizing the charge for all mounting
configurations (UF – Upflow, DF – downflow, LH – Left
Hand Discharge, and RH – Right Hand Discharge).
Refer to the charging chart inside the access panel
cover on the unit and choose the appropriate column
for the specific application being installed or serviced.
New installations utilizing either a CFL/CFM indoor
coil installed on a gas furnace or an H*L air handler in
the downflow or horizontal right hand discharge may
require removal of refrigerant since the factory charge
could result in an overcharge condition.
CHARGING UNITS WITH R-410A
REFRIGERANT
CAUTION: R-410A pressures are
approximately 60% higher (1.6 times) than R-22
pressures. Use appropriate care when using this
refrigerant. Failure to exercise care may result in
equipment damage or personal injury.
Charge for all systems should be checked against the
Charging Chart inside the access panel cover.
IMPORTANT: Do not operate the compres-
sor without charge in the system.
Addition of R-410A will raise high-side pressures (liquid,
and discharge).
NOTICE: System maintenance is to be per-
formed by a qualifi ed and certifi ed technician.
The following method is used for charging systems in
the cooling and heating mode. All steps listed should
be performed to insure proper charge has been set.
For measuring pressures, the service valve port on the
liquid valve (small valve) and the service port on the
suction line between the reversing valve and compres-
sor are to be used.
CONFIRM ID AIR FLOW & COILS ARE CLEAN
Confi rm adequate Indoor supply air fl ow prior to start-
ing the system. See the Technical Specifi cation sheet
for rated air fl ow for each ID/OD unit match. Air fi lter(s)
and coils (indoor & outdoor) are to be clean and free of
frost prior to starting the system. Supply Air fl ow must
be between 375 and 450 cfm per rated cooling ton prior
to adjusting system charge. If a humidifi cation system
is installed disengage it from operating prior to charge
adjustment. Refer to the “Checking Airfl ow” section of
this manual for further instruction.
NOTICE: TVerify system components are
matched according to the outdoor unit Specification
Sheet.
MEASUREMENT DEVICE SETUP
Step 1. With an R410A gauge set, attach the high pres-
sure hose to the access fi tting on the liquid line
(small) service valve at the OD unit.
Step 2. Attach the low pressure hose to the common
suction port connected to the common suction
line between the reversing valve and compres-
sor.
Step 3. Attach a temperature probe within 6” outside
of the unit on the copper liquid line (small line).
For more accurate measurements clean the
copper line prior to measurement and use a
calibrated clamp on temperature probe or an
insulated surface thermocouple.
CHARGING BY WEIGHT
NOTICE: Adjust the system charge by weight
for the straight length of the refrigerant line set.
For a new installation, evacuation of interconnecting tub-
ing and indoor coil is adequate; otherwise, evacuate the
entire system. Use the factory charge shown in “Electri-
cal and Physical Data” on page 7 of these instructions
or on the unit data plate. Note that the charge value in-
cludes charge required for 15 ft. [4.6 m] of standard-size
inter-connecting liquid line without a fi lter drier. Calculate
EVACUATION AND LEAK TESTING
Evacuation
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