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SERVICE POLICY & PROCEDURES
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.
YCAS0250-0440 60 HZ, YCAS0218-0328 60HZ,
YCAS0693-1263 50 HZ, YCAS0685-1215 50HZ,
StARt-UP CHECkLISt
Supersedes: Nothing
COmmISSIOnIng
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.
Form 201.19-CL2 (309)
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Related Manuals for York YCAS0250-0440 60 HZ
Summary of Contents for York YCAS0250-0440 60 HZ
- Page 1 Compressor Oil Commissioning of this unit should only be carried out by YORK Authorized To add oil to a circuit - connect a YORK hand oil pump personnel. (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.
- Page 2 FORM 201.19-CL2 (309) Grounding Compressor Heaters Verify that the unit’s protective terminal(s) are properly Verify the compressor heaters are energized. If connected to a suitable grounding point. Ensure that all the ambient temperature is above 96°F (36°C) the unit internal ground connections are tight. compressor heaters must be on for at least 8 hours before start-up to ensure all refrigerant liquid is driven out of Overloads...
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Page 3: First Time Start-Up
FORM 201.19-CL2 (309) Programmed Settings Start-up Remove the locking device from the unit Auto/OFF Ensure the system cut-out and operational settings switch which prevents unauthorized starting of the unit are in accordance with the instructions provided in before commissioning. Press the “Status” key, then turn Section 8 of the IOM and with the general chiller op- the unit switch to the “1”... - Page 4 FORM 201.19-CL2 (309) Economizer Superheat liquid pressure at the liquid line service valve. Sub- cooling should be 12°F to 15°F (6.7°C to 8.3°C). No (Not all models are equipped with economizers) bubbles should show in the sight glass. If subcooling Check economizer superheat at steady full compres- is out of range add or remove refrigerant as required.
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Page 5: System Start-Up Check List
SALES ORDER #: _________________________ and below the top of the upper sight glass. LOCAtIOn: _______________________________ If it is necessary to add oil, connect a YORK oil SOLD BY: ________________________________ pump to the charging valve on the oil separator, InStALLIng... - Page 6 FORM 201.19-CL2 (309) 13. Be certain all water temp sensors are inserted Verify the selections by pressing the OPTIONS Key on completely in their respective wells and are the control panel. Check them off in the chart above. coated with heat conductive compound. Damage to the chiller could result if 14.Assure that evaporator EEV bulbs are strapped ...
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Page 7: Initial Start-Up
FORM 201.19-CL2 (309) InItIAL StARt-UP 9. Program the Daily Schedule start and stop times. After the control panel has been programmed and the 10. Check the Factory Service Mode programming compressor heater has been on for 24 hours prior to values, assure they are correct, and record the start-up, the chiller may be placed into operation. - Page 8 FORM 201.19-CL2 (309) The subcooling temperature of each system should be Example: calculated by recording the temperature of the liquid Suction Temp = 46°F (8°C) line at the outlet of the condenser and subtracting it minus Suction Press from the recorded liquid line pressure at the liquid stop 60 PSIG converted valve, converted to temperature from the temperature/ to Temp...
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Page 9: Leak Checking
Normally, the thermal expansion valve need not be LEAk CHECkIng adjusted in the field. If however, adjustment needs to be made, the expansion valve adjusting screw should 1. Leak check compressors, fittings, and piping to be turned not more than one turn at a time, allowing assure no leaks.
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