YORK INTERNATIONAL
74
stalled. Pin 1 (dimple in the top of the chip) must be
oriented as shown (Fig. 25). The part number for the
RTC Chip is 031-00955-000.
CRANKCASE HEATER
The crankcase heater for a compressor will be ON
whenever the compressor is not running. The heater is
interlocked into the compressor motor contactor and is
not controlled by the microprocessor.
The purpose of the crankcase heater is to prevent the
migration of refrigerant to the crankcase during shut-
down, assuring proper lubrication of the compressor on
start-up.
Anytime power is removed from the chiller for more than
an hour, the crankcase heater should be left on for 24
hours prior to start. This can be accomplished by ap-
plying 115VAC to the control panel.
26001A
FIG. 34
CLOCK JUMPER
CLOCK JUMPER
EVAPORATOR HEATER
The evaporator heater prevents water standing in the
evaporator from freezing. Whenever outdoor ambient
temperature drops below 40°F, the microprocessors will
turn the evaporator heaters ON. If temperature rises
above 45°F, the heater will be turned off.
METRIC DISPLAY
The control panel is capable of providing displays of
pressure and temperature in metric values. Tempera-
tures will be displayed in °C and pressures in kPa.
A Metric to English temperature conversion table is pro-
vided on the rear cover of this manual. Pressure can be
converted from PSI to kPa using the formula PSI x 6.89
= kPa.
To obtain panel displays in metric, Switch 5 of Dip Switch
S1 on BOTH Microprocessor Boards must be placed in
the OPEN position (Page 39). The positioning of this
switch can then be verified by pushing the OPTIONS
key and verifying that METRIC UNITS READ-OUT is
programmed (Page 36).
NOTE: This verifies the positioning on the Master Mi-
croprocessor Board only. The Slave Micropro-
cessor Board must be checked visually.
EMS/BAS CONTROLS
The microprocessor is capable of REMOTE START/
STOP, REMOTE UNLOADING (Pulldown demand lim-
iting), and REMOTE SETPOINT RESET. These func-
tions can be easily utilized by connecting user supplied
dry contacts to the Microprocessor Board.
REMOTE START/STOP BY A CYCLING DEVICE
OR TIME CLOCK
Remote START/STOP is accomplished by connecting
a time clock or other dry contact in series with the flow
switch on terminals 13 & 14 of both microprocessor
boards. See Fig. 24 for the location of the terminals.
The contact must be closed to allow the respective
module (Master or Slave) to run. Any time the contact
opens, the module will shut down and the following sta-
tus message relating to the Master or Slave Module will
be displayed. Terminals 13 & 14 of the Slave Micro Panel
MUST also be jumpered to allow system 3 to operate.
Wiring from these contacts should not exceed 25 ft.
and should be run in grounded conduit that does not
carry any wiring other than control wiring. Additionally,
S Y S # 1
N O
R U N
P E R M
S Y S # 2
N O
R U N
P E R M
Содержание YDAJ87KU6
Страница 4: ...YORK INTERNATIONAL 4 FIG 1 UNIT COMPONENTS Typical on each of the two modules 00023TG 00024TG...
Страница 5: ...FORM 150 75 NM2 5 YORK INTERNATIONAL FIG 1 UNIT COMPONENTS Cont d LD01910 00025TG...
Страница 24: ...YORK INTERNATIONAL 24 MASTER MODULE WIRING DIAGRAM LD01933 FIG 17 MASTER MODULE CONNECTION DIAGRAM...
Страница 30: ...YORK INTERNATIONAL 30 SLAVE MODULE WIRING DIAGRAM FIG 20 SLAVE MODULE CONNECTION DIAGRAM LD01941...
Страница 99: ...FORM 150 75 NM2 99 YORK INTERNATIONAL...