FORM 150.67-NM2 (209)
121
JOHNSON CONTROLS
6
COMMISSIONING
Commissioning of this unit should
only be carried out by YORK Autho-
rized 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 EQUIPMENT START-UP CHECK
LIST (Page 123) 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 both systems and
that no leaks are apparent. If no pressure is present, a
leak test must be undertaken, the leak(s) located and
repaired. Remote systems and units are supplied with
a nitrogen holding charge. These systems must be
evacuated with a suitable vacuum pump/recovery unit
as appropriate to below 500 microns.
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.
Service and Oil Line Valves
Open each compressor suction, economizer, and
discharge 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 YORK 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
fl
are nut. Using clean oil of the correct type (“T” 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 1.8-2.3 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 excessive 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 subsequent 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
damaged. Ensure blades are at the same height when
rotated. Ensure fan guards are securely
fi
xed.
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 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 the terminal blocks or optional circuit
breaker. Ensure that connections of power cables
within 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.
Ensure that all unit internal ground connections are
tight.
SECTION 6 – COMMISSIONING
Summary of Contents for YCAL0019
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