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I Split System Condensers R410-A Installation Instructions I
3. Set Thermostat selector switch to OFF.
4. Set room thermostat at desired temperature. Be
sure setpoint is below indoor ambient temperature
for cooling and above indoor ambient for heating.
5. Set the system switch of the thermostat on COOL
and fan switch for continuous operation or AUTO, as
desired. Operate unit for 15-20 minutes, then check
the system refrigerant charge if it was necessary to
adjust.
6. After the refrigerant charge has been adjusted, the
system is now ready for continuous operation.
Final Refrigeration Charge Adjustment
Before any adjustment is made to the refrigerant charge, it
is imperative that the air flow characteristics of the indoor
blower be established.
When checking indoor air flow, it is important to remember
that the blower will deliver a higher quantity of air across a
dry coil versus a wet coil. Blower charts are calculated with
a dry coil.
Recommended air flow for installations of cooling units is
350-450 CFM per ton (12,000 BTUH) through a wet coil.
Refer to indoor unit installation instructions for proper
methods of determining air flow and blower perfor-
mance.
Factory charge is shown on unit information plate. R-410A
refrigerant cylinders contain a dip tube which allows liquid
refrigerant to flow from cylinder in upright position. Charge
R410-A units with cylinder in upright position and a com-
mercial-type metering device in manifold hose. Charge re-
frigerant into suction line.
NOTE: If superheat or subcooling charging conditions
are not favorable, charge must be weighed in accor-
dance with unit rating plate 0.5 oz/ft of 3/8-in. liquid line
above or below 25 ft respectively.
To Check System Refrigerant Charge
(Superheat Method), Cooling Only
NOTE: On units with two speed fan control the fan will be
on low speed if the temperature is below 83° E Pull one of
the yellow low voltage wires offthe fan control and the unit
will default to high speed fan for servicing. Reconnect wire
after checking.
Units with Cooling Mode TXV
Units installed with cooling mode TXV require charging by
the subcooling method.
1. Operate unit aminimum of 10 minutes before check-
ing charge.
2. Measure liquid service valve pressure by attaching
an accurate gage to service port.
3. Measure liquid line temperature by attaching an ac-
curate thermistor type or electronic thermometer to
liquid line near outdoor coil.
4. Refer to unit rating plate for required subcooling tem-
perature.
5. Refer to Figure 12. Find the point where required
subcooling temperature intersects measured liquid
service valve pressure.
6. To obtain required subcooling temperature at a spe-
cific liquid line pressure, add refrigerant if liquid line
temperature is higher than indicated or reclaim refrig-
erant if temperature is lower. Allow a tolerance of 3E
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