York MILLENNIUM YG Series, Эксплуатация и техническое обслуживание

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YORK INTERNATIONAL
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FORM 160.60-O1
MICRO PANEL CONTROL CENTER
The Control Center front panel layout consists of five key
groups, one switch, and 1 line by 40 character alphanu-
meric vacuum fluorescent display: (See Fig. 4)
CHARACTER DISPLAY – The alphanumeric vacuum fluo-
rescent display is located to the right of the “ STA-
TUS ” key. All messages, parameters, setpoints, and data
can be viewed at this location. The main communica-
tions between the operator or service technician and the
MicroComputer Control Center occur on this display.
DISPLAY – Provides a direct read-out of each monitored
parameter on the alphanumeric display.
ENTRY – These keys are used to enter the values for the
operator programmed setpoints. These keys are used in
conjunction with the “ SETPOINT ” keys while in program
mode.
SETPOINTS – These keys are used as follows:
1. To view each setpoint, in any Mode, or
2. To select the individual setpoints that are programmed
by the operator in “ PROGRAM ” mode only.
Pressing the appropriate key enables the operator to pro-
gram that setpoint by pressing the “ ENTRY ” keys.
SERVICE – Included in this group of keys are those func-
tions that are only relevant to servicing the chiller.
Typically, these keys would not be used for daily chiller
operation.
ACCESS CODE – Permits operator to access the
program.
PROGRAM – Permits operator to program the Control
Center.
MODE – Permits operator to check what mode the
Control Center is presently in (“ LOCAL ”, “ REMOTE ” or
“ SERVICE ”).
1. Service – allows manual PRV or engine speed
control with visual display readout of operation.
Also allows manual engine speed control with
visual display readout of engine speed.
2. Local – allows manual chiller start from the “ COM-
PRESSOR ” switch on Control Center front.
3. Program – allows operator programming of system
setpoints.
4. Remote – allows remote start, remote stop of com-
pressor and remote reset of LCWT and % engine load
limit.
COMPRESSOR – “ START ”, “ RUN ”, “ STOP/RESET ”
SWITCH – This 3 position rocker switch is used to start
(except in “ REMOTE ” mode), stop/run/reset the system.
OPERATION
DISPLAYING SYSTEM PARAMETERS
The “ DISPLAY ” keys are used to display selected moni-
tored parameters as follows: (Refer to Fig. 4)
• Press and release the appropriate “ DISPLAY ” key –
the message will be displayed for 2 seconds.
- or -
• Press and hold the appropriate “ DISPLAY ” key – the
message will be displayed and updated every 0.5 sec-
onds until the “ DISPLAY ” key is released.
- or -
• Press and release appropriate “ DISPLAY ” key, then press
and release the “ DISPLAY HOLD ” key – the message
will be displayed and updated every 2 seconds until the
“ DISPLAY HOLD ” key is again pressed and released, or
10 miutes have elapsed, whichever comes first.
NOTE: If the display actually displays X’s, then the moni-
tored parameter is out of normal operating range
(Ref. Fig. 5). If the “English/Metric” jumper is
installed on the Micro Board, all temperatures
are displayed in degrees Fahrenheit (°F) and all
pressures are displayed in pounds per square
inch gauge (PSIG) except oil pressure which is
displayed in pounds per square inch differential
(PSID). If the “English/Metric” jumper is not in-
stalled, all temperatures are displayed in degrees
Centigrade (°C) and all pressures are displayed
in Kilo-Pascals (kPa).
OUT OF RANGE VALUES FOR YG & YB CHILLER VARIABLES (R134A)
VARIABLE DISPLAY -> X’S WHEN,
EVAP PRESSURE (WATER & BRINE) <= 6.8 PSIG
OR
>= 77.4 PSIG
COND PRESSURE <= 6.8 PSIG
OR
>= 315.0 PSIG
HOP TRANSDUCER PRESSURE >= 315.0 PSIG
LOP TRANSDUCER PRESSURE >= 315.0 PSIG
DISCHARGE TEMPERATURE <= 20.3°F
OR
>= 226.4°F
OIL TEMPERATURE <= 20.3°F
OR
>= 226.4°F
LEAVING COND WATER TEMP. <= 8.4°F
OR
>= 134.1°F
ENTERING COND WATER TEMP. <= 8.4°F
OR
>= 134.1°F
LEAVING CHILLED WATER TEMP. >= 81.1°F
ENTERING CHILLED WATER TEMP. <= 0.1°F
OR
>= 93.0°F
FIG. 5 – SYSTEM PARAMETERS – OUT OF RANGE
READINGS (Also see page 51)
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