93JOHNSON CONTROLS
FORM NO.: 6U6K-B01E-NB-EN
SECTION 6 – COMMISSIONING
COMMISSIONING
Commissioning of this unit should only be carried
out by YORK Authorized personnel.
Commissioning personnel should be thoroughly familiar with
the information contained in this literature, in addition to this
section.
Perform the commissioning using the detailed checks outlined
in the START-UP CHECK LIST as the commissioning procedure
is carried out.
PREPARATION – POWER OFF
The following basic checks should be made with the customer
power to the unit switched OFF.
Inspection
Inspect unit for installation damage. If found, take action and/or
repair as appropriate.
Refrigerant Charge
Packaged units are normally shipped as standard with a full
refrigerant operating charge. Check that refrigerant pressure
is present in each system and that no leaks are apparent. If no
pressure is present, a leak test must be undertaken, the leak(s)
located and repaired. Repaired systems must be evacuated with
a suitable vacuum pump/recovery unit as appropriate to below
100 microns before charging.
Do not liquid charge with static water in the cooler.
Care must also be taken to liquid charge slowly to
avoid excessive thermal stress at the charging point.
Once the vacuum is broken, charge into the condenser coils
with the full operating charge as given in the Technical Data
section.
Liquid subcooling measured at the liquid line should be
between 5ºC and 8ºC when unit is operating in cooling mode
and fully loaded. Subcooling is determined by the level of
refrigerant charge in each system.
Service Valves
Ensure that the compressor discharge and suction service valves
are set correctly (OPEN).
Compressor Oil
The units are charged with sufcient oil to ensure the effective
and reliable operation in full envelope. However, the units may
need additional oil charge in eld in case leakage is detected or
the compressor is being replaced.
To add oil to a circuit – connect a YORK hand oil pump to the
1/4” oil charging connection before the accumulator with a
length of clean hose or copper line, but do not tighten the are
nut. Using clean oil of the correct type (FVC68D for Hitachi
compressors and POE oil for Copeland compressor), 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
1.6 liters is present in single compressor system and 5.0~5.5
liters in tandem compressor system. Too much oil may cause
excessive oil carryover in the system. High oil concentration
in the system may cause nuisance trips resulting from incorrect
readings on temperature sensors. Temperature sensor errors
may result in poor liquid control and resultant liquid overfeed
and subsequent damage to the compressor.
Fans
Check that all fans are free to rotate and are not damaged.
Ensure blades are at the same height when rotated. Ensure fan
guards are securely xed.
Isolation / Protection
Verify all sources of electrical supply to the unit are taken
from a single point of isolation. Check that the m aximum
recommended air switch sizes given in the Technical Data
section has not been exceeded.
Control Panel
Check the panel to see that it is free of foreign materials (wire,
metal chips, etc.) and clean out if required.
Power Connections
Check that the customer power cables are connected correctly to
SECTION 6 – COMMISSIONING
Cooke Industries - Phone: +64 9 579 2185 Email: sales@cookeindustries.co.nz Web: www.cookeindustries.co.nz
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