R-134A Field Charging Procedure; Factory Refrigerant Charging Procedure (Initial); Field Refrigerant Charging Procedure; Adding Charge - Trane R Series Installation, Operation And Maintenance Manual

Maintenance
Some symptoms of an oil over-charged unit:
• Larger than normal evaporator approach
temperatures (leaving water temperature - saturated
evaporator temperature)
• Low evaporator refrigerant temperature limit
• Erratic liquid level control
• Low unit capacity
• Low discharge superheat (especially at high loads)
• Low liquid level diagnostics
• High oil sump level after normal shut down
Some symptoms of an oil under-charged unit:
• Compressor rattle or grinding sound
• Lower than normal pressure drop through oil system
• Seized or welded compressors
• Low oil sump level after normal shut down
• Lower than normal oil concentrations in evaporator

R-134a Field Charging Procedure

Be certain that the electrical power to the unit is
disconnected before performing this procedure.
WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. For variable frequency drives
or other energy storing components provided by Trane
or others, refer to the appropriate manufacturer's
literature for allowable waiting periods for discharge of
capacitors. Verify with an appropriate voltmeter that all
capacitors have discharged. Failure to disconnect power
and discharge capacitors before servicing could result
in death or serious injury.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06A-EN
Factory Refrigerant Charging Procedure
(Initial)
The initial charging procedure should be followed the first
time the unit is charged in the factory, as well as for
charging any time after the charge has been completely
removed from the entire system in the event of repair.
1. As part of automatic vacuum/charge procedure, verify
that the EXVs are OPEN.
2. Attach vacuum hoses to evaporator service valves (one
per circuit). Open service valves.
RTAC-SVX01J-EN
3. Attach charging hoses to the charging port on the liquid
line filter (one per circuit).The filters contain a port with
a ¼" (6mm) flare.
4. Begin semi-automatic vacuum procedure.
5. When vacuum is complete (indicated), manually
isolate the unit from vacuum.
6. Charge unit through the filter housing port per
p. 12 through Table 10, p.
7. When charging is complete, shut evaporator service
valve and disconnect vacuum and charging hoses.

Field Refrigerant Charging Procedure

Follow this procedure when the unit is empty of all
refrigerant and under a vacuum. Add the charge through
the evaporator service valve.
NOTICE:
Evaporator Damage!
Water must be flowing through the evaporator during
the entire charging process to avoid freezing and
rupturing of the evaporator tubes. Charge first with
vapor to avoid freezing tubes.
If insufficient concentration or no glycol is used, the
evaporator water pumps must be controlled by the
CH530 to avoid severe damage to the evaporator due to
freezing. A power loss of 15 minutes during freezing
can damage the evaporator. It is the responsibility of
the installing contractor and/or the customer to ensure
that a pump will start when called upon by the chiller
controls.
Please consult Table 27, p. 54
of glycol.
The warranty will be void, in case of freezing due to the
lack of use of either of these protections.
1. Note the weight of the amount of charge removed.
Compare it to Table 1, p. 12
difference in charge may indicate a leak.
2. Attach charging hose to evaporator service valve (3/8"
(9mm) flare). Open service valve.
3. Add charge to evaporator to bring total circuit charge
up to the level indicated in the above chart.
4. Close service valve and disconnect charging hose.

Adding Charge

This procedure should be followed when adding charge to
an undercharged unit. When low charge is indicated by
low subcooling in the liquid line, charge should be added
until sufficient subcooling is achieved.
1. Attach charging hose to evaporator service valve (3/8"
(9mm) flare). Open service valve.
2. Add 10 pounds of refrigerant (R-134a) charge.
Table 1,
21.
for correct concentration
through Table 10, p. 21. A
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