York YLAA Series Installation Operation & Maintenance page 100

SECTION 6 – COMMISSIONING
Service and Oil Line Valves
Open each compressor suction, economizer, and dis-
charge service valve. If valves are of the back-seat
type, open them fully (counterclockwise) then close
one turn of the stem to ensure operating pressure is fed
to pressure transducers. Open the liquid line service
valve and oil return line ball valve fully in each system.
Compressor Oil
To add oil to a circuit – connect a Johnson Controls
hand oil pump (Part No. 470-10654-000) to the 1/4" oil
charging connection on the compressors with a length
of clean hose or copper line, but do not tighten the flare
nut. Use YORK "V" oil 011-00949-000, when adding
oil to Copeland compressor. The Bitzer compressor
uses 011-00982-000 oil. Pump oil until all air has been
purged from the hose then tighten the nut. Stroke the oil
pump to add oil to the oil system. Approximately 1.8
to 2.3 gallons is present in the each refrigerant system.
Oil levels in the oil equalizing line sight glass should
be between the bottom and the middle of the sight glass
with the system OFF. High oil levels may cause exces-
sive oil carryover in the system. High oil concentration
in the system may cause nuisance trips resulting from
incorrect readings on the level sensor and temperature
sensors. Temperature sensor errors may result in poor
liquid control and resultant liquid overfeed and sub-
sequent damage to the compressor. While running, a
visible sign of oil splashing in the sight glass is normal.
Fans
Check that all fans are free to rotate and are not dam-
aged. Ensure blades are at the same height when ro-
tated. Ensure fan guards are securely fixed.
Isolation / Protection
Verify all sources of electrical supply to the unit are
taken from a single point of isolation. Check that the
maximum recommended fuse sizes given in SECTION
5 – TECHNICAL DATA has not been exceeded.
Control Panel
Check the panel to see that it is free of foreign materi-
als (wire, metal chips, etc.) and clean out if required.
100
Power Connections
Check that the customer power cables are connected
correctly to the terminal blocks or optional circuit
breaker. Ensure that connections of power cables with-
in the panels to the circuit breaker or terminal blocks
are tight.
Grounding
Verify that the unit's protective ground terminal(s) are
properly connected to a suitable grounding point. En-
sure that all unit internal ground connections are tight.
Supply Voltage
Verify that the site voltage supply corresponds to the
unit requirement and is within the limits given in SEC-
TION 5 – TECHNICAL DATA.
Water System
Verify the chilled liquid system has been installed cor-
rectly, and has been commissioned with the correct
direction of water flow through the cooler. The inlet
should be at the refrigerant piping connection end of
the cooler. Purge air from the top of the cooler using
the plugged air vent mounted on the extension pipe.
Flow rates and pressure drops must be within the limits
given in SECTION 5 – TECHNICAL DATA. Operation
outside of these limits is undesirable and could cause
damage.
If mains power must be switched OFF for extended
maintenance or an extended shutdown period, the com-
pressor suction, discharge and economizer service stop
valves should be closed (clockwise). If there is a pos-
sibility of liquid freezing due to low ambient tempera-
tures, the coolers should be drained or power should be
applied to the chiller. This will allow the cooler heater
to protect the cooler from freezing down to –20 °F. Be-
fore placing the unit back in service, valves should be
opened and power must be switched ON (if power is
removed for more than 8 hours) for at least 8 hours (24
hours if ambient temperature is below 86 °F [30 °C])
before the unit is restarted.
FORM 150.72-ICOM6
ISSUE DATE: 12/29/2017
JOHNSON CONTROLS