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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.

Summary of Contents for YCAS0218-0328 60HZ

Page 1: ...ating 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 opera...

Page 2: ...above 96 F 36 C the compressor heaters must be on for at least 8 hours before start up to ensure all refrigerant liquid is driven out of the compressor If the ambient temperature is below 86 F 30 C th...

Page 3: ...osition Start up Remove the locking device from the unit Auto OFF switch which prevents unauthorized starting of the unit before commissioning Press the Status key then turn the unit switch to the 1 p...

Page 4: ...ine temperature on the copper line beside the main liquid line service valve Measure 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 bubbles shoul...

Page 5: ...l level should always be maintained running or not above the bottom of the lower sight glass and below the top of the upper sight glass If it is necessary to add oil connect a YORK oil pump to the cha...

Page 6: ...or Current Averaging Start Up Disabled 6 Heat Recovery Disabled Do Not Use 7 Expansion Valve Thermostatic Expansion Valve Electronic 8 Spare Spare Expansion valve electronic should always be selected...

Page 7: ...discharge condensing pressure can be found in the refriger ant temperature pressure chart use entering air temperature 30 F 17 C for normal condens ing temperature b The temperature of the liquid refr...

Page 8: ...superheat setting for a system is 10 12 F 6 7 C The superheat is calculated as the difference between the actual temperature of the returned refrigerant gas in the suction line entering the compresso...

Page 9: ...ow SYS 1 SYS 2 SYS 3 SYS 4 Economizer Gas Temp PSIG kPa Economizer Press F C Temp F C Superheat F C This superheat should only be checked in an ambient above 90 F 32 C Otherwise mid range adjustment f...

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