SERVICE POLICY & PROCEDURES
YCAS0250-0440 60 HZ, YCAS0218-0328 60HZ,
YCAS0693-1263 50 HZ, YCAS0685-1215 50HZ,
StARt-UP CHECkLISt
Supersedes: Nothing
Form 201.19-CL2 (309)
COmmISSIOnIng
References to IOM in this document are as
follows:
YCAS0250-0440 (60Hz-R22) - 201.19-NM2
YCAS0218-0328 (60Hz-R407) - 201.19-NM4
YCAS0693-1263 (50Hz-R22) - 201.19-NM6
YCAS0685-1215 (50Hz-R407) - 201.19-NM8
PREPARAtIOn
Commissioning of this unit should only
be carried out by YORK Authorized
personnel.
The Millennium Microcomputer Control System
Operating Instructions must be read in conjunction
with this section.
PREPARAtIOn – POwER OFF
The following checks should be made with the customer
supply/supplies to the unit switched
“
OFF
”
.
Inspection
Inspect unit for installation damage. If damage is found
take action and/or repair as appropriate.
Refrigerant Charge
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) should be located and repaired.
Repaired systems and units supplied with a nitrogen
holding charge must be evacuated with a suitable vac-
uum pump/recovery unit as appropriate to below 100
microns.
Do not liquid charge with static water in the evaporator.
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.
Reference the Technical Data
Section in the IOM.
Valves
Open each compressor suction, economizer, and dis-
charge valve fully (counter-clockwise) then close one
turn of the stem to ensure operating pressure is fed to
the pressure transducers. Open the liquid line service
valve fully and ensure the oil return line ball valve is
open 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 flare nut. Using
clean oil of the correct type (“L” 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 5 gallons is present in the entire chiller
system, with 1-2 gallons in the oil separator.
Fans
Check that all fans are free to rotate and are not dam-
aged. Ensure blades are at the same height when rotated.
Ensure fan guard is securely fixed.
Isolation/Protection
Verify that all sources of electrical supply to the unit
are taken from a single point of isolation. Check that
the maximum recommended fuse sizes have not been
exceeded.
Reference the Technical Data Section in the
IOM
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 to assure the customer power cables are connected
correctly. Ensure that connections of power cables within
the panels to the circuit breakers, terminal blocks or
switch disconnectors are tight.
