Panel Checks - York MILLENNIUM YCAS 250 Manual

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14. Assure that evaporator TXV bulbs are strapped
onto the suction lines at 4 or 8 o'clock posi-
tions.
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15. Assure that 5 ton TXV bulbs are inserted fully
into the wells in the compressors and that the
bulbs are coated with heat conductive com-
pound.
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16. Assure that the 15 ton economizer TXV bulbs
are strapped onto the compressor economizer
supply lines at 4 or 8 o'clock positions.

Panel Checks

(Power ON – Both System Switches "OFF")
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1. Apply 3-phase power and verify its value (See
Fig. 8, page 35).
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2. Apply 115VAC and verify its value on the ter-
minal block in the lower left of the Power Panel.
Make the measurement between terminals 5 and
2 (See Fig. 12, page 40). The voltage should be
115VAC +/- 10%.
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3. Assure the heaters on each compressor are on.
Allow the compressor heaters to remain on a
minimum of 24 hours before startup. This is im-
portant to assure that no refrigerant is in the com-
pressor oil at start-up!
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4. Program the dip switches on the microproces-
sor board for the desired operating requirements.
See Page 159. OPEN = Left side of switch
pushed down. CLOSED = Right side of switch
pushed down.
SWITCH "OPEN"
SWITCH
SETTING
1 Water Cooling
2
Standard Ambient
Control
3 Refrigerant R-407C
Verify the selections by pressing the OPTIONS
Key on the control panel. Check them off.
Damage to the chiller could result if
switches are improperly programmed.
YORK INTERNATIONAL
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SWITCH "CLOSED"
SETTING
Brine Cooling
Low Ambient
Control
Refrigerant R-22
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Dip switches 4 through 8 are spares
and have no function.
5. Program the required operating values into the
micro for cut-outs, safeties, etc. and record them
in the chart below. See Page 176 for details.
If Default Values are desired for programming
convenience, press the PROGRAM key, 6140,
and ENTER. This loads default values. Record
these values in the chart below.
PROGRAMMED VALUES
Refrigerant Type = _________________________
Dischg Press Cut-out = ____________ PSIG (kPa)
Disch Press Unld = ________________ PSIG (kPa)
Suction Press Cut-out = ____________ PSIG (kPa)
High Amb Cut-Out = ___________________ °F (°C)
Low Amb Cut-Out = ___________________ °F (°C)
Leaving Chilled Liquid Temp Cut-Out = _____ °F (°C)
High Motor Current Unload = ____________ % FLA
Anti-Recycle Time = ____________________ Secs
6. Program the Chilled Liquid Setpoint/Range and
record:
Setpoint = __________________ °F (°C)
Range = ________ to ________ °F (°C)
Keep in mind that the Target temperature dis-
played by the micro should equal the desired
leaving water temperature.
7. Assure that the CLK jumper J18 on the Micro-
processor Board is in the ON position (Top 2
pins).
8. Set the Time and Date.
9. Program the Daily Schedule start and stop times.
FORM 201.18-NM3
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