York YCAZ33BA3, Руководство пользователя, Страница: 68 / 88

YORK INTERNATIONAL
68
¨ 4. Program the Dip Switches on the Microproces-
sor Board (Page 26) and verify the selection by
pressing the OPTIONS key.
Switch 3 should always be closed.
Switch 6 should always be closed.
NOTE: It is IMPORTANT that all switches are properly
programmed. Otherwise, undesirable operation
will result.
¨ 5. Press the PROGRAM key and program each of
the 11 limits and record them.
They are as follows:
¨
• Discharge Cut-out ____________________ PSIG
¨
• Outside Air Temp Low Cut-out __________°F
¨
• Outside Air Temp High Cut-out __________ °F
¨
• Discharge Pressure Unload Pressure ____ PSIG
¨
• Suction Pressure Unload Pressure ______ PSIG
¨
• Leaving Water Temp Cut-out ___________ °F
¨
• Suction Pressure Cut-out ______________ PSIG
¨
• Rate Control Temperature ______________ °F
¨
• Anti Recycle Time ____________________ SEC.
¨
• Rate Sensitivity ______________________ °F/MIN.
¨
• Number of Load Steps_________________
See page 34 for assistance in programming these
values.
¨ 6. Program the date and time by first assuring that
the CLK jumper J18 on both Microprocessor
Boards (Fig. 24) is in the ON position (Top 2 pins).
Press the SET TIME key and set the date and
time (Page 38).
¨ 7. Program the Daily and Holiday Start/Stop Sched-
ule by pressing the SET SCHEDULE/HOLIDAY
key (Page 39).
¨ 8. Program the Chilled Liquid Setpoint and Control
Range by pressing the CHILLED LIQUID TEMP/
RANGE key (Page 41). Record the setpoint and
control range: Setpoint: _____________ °F
Control Range: ________ °F
¨ 9. If the Remote Reset is to be used, the maximum
reset must be programmed. This can be pro-
grammed by pressing the REMOTE RESET
TEMP RANGE key (Page 64).
INITIAL START-UP
After the operator has become thoroughly familiar with
the control panel and has performed the preceding
checks 24 hours prior to start-up, the unit can be put
into operation.
¨ Place the System Switches to the ON position. See
the OPERATING SEQUENCE for unit operation.
¨ The compressor will start and a flow of liquid should
be noted in the liquid indicator. After several min-
utes of operation, the bubbles will disappear and
there will be a solid column of liquid when the unit
is operating normally. On start-up, foaming of the
oil may be evident in the compressor oil sight glass.
After the water temperature has been pulled down
to operating conditions, the oil should be clear. Nor-
mal operation of the unit is evidenced by a hot dis-
charge line (discharge superheat should not drop
below 50°F) clear oil in the compressor crankcase,
solid liquid refrigerant in the liquid indicator and usu-
ally no more than 2 PSIG variation in suction pres-
sure for any given set of operating conditions.
¨ Allow the compressor to run for a short time, being
ready to stop it immediately if any unusual noise or
other adverse condition should develop. When
starting the compressor, always make sure the oil
pump is functioning properly. Compressor oil pres-
sure must be as described in the SYSTEM
SAFETY’S Section, page 50.
¨ Check the system operating parameters. Do this
by selecting various read-outs such as pressures
and temperatures. Compare these to test gauge
readings. Record read-outs below:
CHILLED LIQUID TEMPERATURES
Return:_________________________ °F
Leaving:________________________ °F
AMBIENT TEMPERATURE ___________ °F
SYSTEM 1 PRESSURES
Suction:________________________ PSIG
Oil:____________________________ PSID
Discharge:_____________________ PSIG
SYSTEM 2 PRESSURES
Suction: ________________________ PSIG
Oil: ____________________________ PSID
Discharge:______________________ PSIG
MOTOR CURRENT:
SYS 1:_________________________ %
SYS 2:_________________________ %
OPTIONS:
________________________________
________________________________
________________________________
________________________________
________________________________