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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 of TB1 (See Fig. 12, page 39). 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 microprocessor
board for the desired operating requirements. See
Page 122. 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 R407C
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.
Dip switches 4 through 8 are spares
and have no function.
YORK INTERNATIONAL
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PROGRAMMED VALUES
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SWITCH "CLOSED"
SETTING
Brine Cooling
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Low Ambient
Control
Refrigerant R-22
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INITIAL START-UP
After the control panel has been programmed and the
compressor heater has been on for 24 hours prior to
start-up, the chiller may be placed into operation.
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5. Program the required operating values into the
micro for cutouts, safeties, etc. and record them
in the chart below. See Page 139 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
Refrigerant Type = _________________________
Dischg Press Cutout = _____________ kPa (PSIG)
Disch Press Unld = ________________ kPa (PSIG)
Suction Press Cutout = _____________ kPa (PSIG)
High Amb Cutout = ____________________ °C (°F)
Low Amb Cutout = ____________________ °C (°F)
Leaving Chilled Liquid Temp Cutout = ______ °C (°F)
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.
1. Place the System Switches on the Microproces-
sor Board to the ON position.
2. The compressor will start and a flow of refrig-
erant will be noted in the sight glass. After sev-
eral minutes of operation, the bubbles in the sight
glass will disappear and there will be a solid col-
umn of liquid when the TXV stabilizes. After
FORM 201.18-NM8
.
8
97
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