7
inside of cap. Tighten cap finger-tight and then tighten
additional 1/6 of a turn (1 wrench flat), or to the following
specification, to properly seat the sealing surfaces.
1. 3/8” valve to 5 - 10 in-lbs
2. 5/8” valve to 5 - 20 in-lbs
3. 3/4” valve to 5 - 20 in-lbs
4. 7/8” valve to 5 - 20 in-lbs
Do not introduce liquid refrigerant from the cylinder into
the crankcase of the compressor as this may damage the
compressor.
CAUTION
POSSIBLE REFRIGERANT LEAK
To avoid a possible refrigerant leak, open the service valves
until the top of the stem is 1/8” from the retainer.
1. Break vacuum by fully opening liquid and suction
base valves.
2. Set thermostat to call for cooling. Check indoor and
outdoor fan operation and allow system to stabilize
for 10 minutes for fixed orifices and 20 minutes for
expansion valves.
Charge Verification
WARNING
REFRIGERANT UNDER PRESSURE!
•
Do not overcharge system with refrigerant.
•
Do not operate unit in a vacuum or at negative pressure.
Failure to follow proper procedures may cause property
damage, personal injury or death.
CAUTION
Use refrigerant certified to AHRI standards. Used
refrigerant may cause compressor damage. Most portable
machines cannot clean used refrigerant to meet AHRI
standards.
NOTICE
Violation of EPA regulations may result in fines or other
penalties.
CAUTION
Damage to the unit caused by operating the compressor with
the suction valve closed is not covered under the warranty
and may cause serious compressor damage.
Final Charge Adjustment
Airflow and Total Static Pressure for the indoor unit should
be verified before attempting to charge system.
1. Total static pressure is .5” WC or less.
2.
Airflow is correct for installed unit.
3.
Airflow tables are in the installation manual and Spec
Sheet for Indoor Unit.
4. Complete charging information are in Service Manual
RS6200006.
NOTE: Superheat adjustments should not be made
until indoor ambient conditions have stabilized.
This could take up to 24 hours depending on
indoor temperature and humidity. Before checking
superheat run the unit in cooling for 10-15 minutes
or until refrigerant pressures stabilize. Use the
following guidelines and methods to check unit
operation and ensure that the refrigerant charge
is within limits.
The outdoor temperature must be 60°F or higher. Set the
room thermostat to COOL, fan switch to AUTO, and set the
temperature control well below room temperature.
Units matched with indoor coils equipped with a non-
adjustable TXV should be charged by Subcooling only.
Superheat on indoor coils with adjustable TXV valves are
factory set and no adjustment is normally required during
startup. Only in unique applications due to refrigerant
line length, differences in height between the indoor
and outdoor unit and refrigerant tubing sizes or poor
performance should Superheat setting require adjustment.
These adjustments should only be performed by
qualified service personnel. For detailed charge and TXV
adjustments refer to the appropriate Service Manual.
Fixed Orifice
CAUTION
To prevent personal injury, carefully connect and
disconnect manifold gauge hoses. Escaping liquid
refrigerant can cause burns. Do not vent refrigerant into
the atmosphere. Recover all refrigerant during system
repair and before final unit disposal.
1.
Purge gauge lines. Connect service gauge manifold
to base-valve service ports. Run system at least 10
minutes to allow pressure to stabilize.
2. Temporarily install a thermometer 4-6” from
the compressor on the suction line. Ensure the
thermometer makes adequate contact and is insulated
for best possible readings. Use vapor temperature to
determine superheat.
3. Refer to the superheat table provided for proper
system superheat. Add charge to lower superheat or
recover charge to raise superheat.
4. Disconnect manifold set, installation is complete.
Superheat Formula = Suct. Line Temp. - Sat. Suct.
Temp.
