JOHNSON CONTROLS
38
FORM 150.66-NM1 (708)
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 40) 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 valve on the oil separator piping with a
length of clean hose or copper line, but do not tighten
the fl are nut. Using clean oil of the correct type (“F”
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. The oil level should be between
the middle of the lower and middle of the upper
sight glasses of the oil separator. Approximately 4-
5 gallons is present in the each refrigerant system,
with typically 1-2 gallons in each oil separator. Oil
levels in the oil separators above the top sight glass
in either oil separator should be avoided and 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.
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.
SECTION 5 - COMMISSIONING