York MILLENNIUM YCAS, Installation Operation & Maintenance

Page: 94 / 152

94 YORK INTERNATIONAL
High Amb Cut-Out = ___________________ °C (°F)
Low Amb Cut-Out = ____________________ °C (°F)
Leaving Chilled Liquid Temp Cut-Out = _____ °C (°F)
High Motor Current Unload =______________% FLA
Anti-Recycle Time = _____________________ Secs
q
6. Program the Chilled Liquid Setpoint/Range and
record:
Setpoint = ____________ °C (°F)
Range = ________ to ________ °C (°F)
Keep in mind that the Target temperature dis-
played by the micro should equal the desired leav-
ing water temperature.
q
7. Assure that the CLK jumper J18 on the Micropro-
cessor Board is in the ON position (Top 2 pins).
q
8. Set the Time and Date.
q
9. Program the Daily Schedule start and stop times.
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.
q
1. Place the System Switches on the Microproces-
sor Board to the ON position.
q
2. The compressor will start and a flow of refriger-
ant will be noted in the sight glass. After several
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 the
water temperature stabilizes at desired operating
conditions, the oil should be clear.
q
3. Allow the compressor to run a short time, being
ready to stop it immediately if any unusual noise
or adverse conditions develop. Immediately at
start-up, the compressor will make sounds dif-
ferent from its normal high pitched sound. This is
due to the compressor coming up to speed and
lubrication changing from liquid refrigerant to oil.
This should be of no concern and lasts for only a
short time.
q
4. Check the system operating parameters. Do this
by selecting various displays such as pressures
and temperatures. Compare these to test gauge
readings.
PANEL CHECKS
(Power ON – Both System Switches “OFF”)
q
1. Apply 3-phase power and verify its value (See
Fig. 8, page 35).
q
2. Apply 115VAC and verify its value on the termi-
nal block in the lower left of the Power Panel.
Make the measurement between terminals 5 and
2 of TB1 (See Fig. 8, page 35). The voltage should
be /- 10%.
q
3. Assure the heaters on each compressor are on.
Allow the compressor heaters to remain on a mini-
mum of 24 hours before startup. This is impor-
tant to assure that no refrigerant is in the com-
pressor oil at start-up!
q
4. Program the dip switches on the microprocessor
board for the desired operating requirements. See
Page 119. OPEN = Left side of switch pushed
down. CLOSED = Right side of switch pushed
down.
Verify the selections by pressing the OPTIONS
Key on the control panel. Check them off.
CAUTION: Damage to the chiller could result if
switches are improperly programmed.
NOTE: Dip switches 4 through 8 are spares
and have no function.
q
5. Program the required operating values into the
micro for cut-outs, safeties, etc. and record them
in the chart below. See Page 135 for details.
If Default Values are desired for programming con-
venience, 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 = ____________ kPa (PSIG)
Disch Press Unld = _______________ kPa (PSIG)
Suction Press Cut-out = ____________ kPa (PSIG)
SWITCH
SWITCH “OPEN” SWITCH “CLOSED”
SETTING SETTING
1 Water Cooling Brine Cooling
2
Standard Ambient Low Ambient
Control Control
3 Refrigerant R-407C Refrigerant R-22
System Start-Up