42 YORK INTERNATIONAL
MON. 10:00 AM Low Evap. LEP external Set to Job Set to Job To restart, press See OPERATION
Pressure control (Brine Spec. Spec. compressor switch ANALYSIS Table 2
Brine units only) from STOP/RESET Symptom 2.
to START position
MON. 10:00 AM Low Oil Low Oil 25 PSID 15 PSID Will restart when Refer to OPERATION
Pressure Pressure (172.4 kPa) (103.4 kPa) pressure increases ANALYSIS Table 2
Transducer to 25 PSID. To Symptoms 4, 5, 6, 7,
(OP) restart, press com- 9, 10, 11
pressor switch from
STOP/RESTART to
START position.
MON. 10:00 AM High High Pressure 265 PSIG 205 PSIG Will restart when See Operational
Pressure Safety Control (1827.2 kPa) (1413.5 kPa) pressure falls to Analysis Table 2
(HP) (R-22) (R-22) 205 PSIG. To restart Symptom 1 High
180 PSIG 120 PSIG
press compressor Discharge Pressure
(1241.1 kPa) (827.4 kPa)
switch from STOP/
(R-134a) (R-134a)
RESET to START
position
MON. 10:00 AM Evap. Trans. Evap. Pressure To restart press Defective Evap. Pressure
or Probe Transducer or compressor switch Transducer or Leaving Chilled
Error Leaving Chilled from STOP/RESET Water thermistor (RS1).
Water Thermis- to START position LCWT minus saturation tem-
tor (RS1) perature is less than –2.5°F
(–1.4°C) or greater than 25°F
(13.9°C). Checked every 10
minutes following a 10 min.
bypass at start-up.
MON. 10:00 AM Motor Con- CM2 or Solid Reset the device CM2, or Solid State
troller – Ext. State Starter that caused the shut- Starter has shutdown
Reset (RT2) down. Chiller will chiller
start automatically.
MON. 10:00 AM High Discharge Temp. 220°F 219°F To restart press Condenser tubes dirty or
Discharge Thermistor (104.5°C) (103.9°C) compressor switch scaled or high condenser
Temp. (RT2) from STOP/RESET water temperature. (See
to START position. Symptom 1, Table 1.)
MON. 10:00 AM High Oil Oil Temperature 170°F 169°F To restart press Dirty oil filter or restricted
Temp. Thermistor (76.7°C) (76.2°C) compressor switch oil cooler line. Change oil
(RT3) from STOP/RESET filter. Refer to OPERATION
to START position ANALYSIS Table 2,
Symptom 9.
MON. 10:00 AM Power Auto-Restart Micro Board 8.29VDC 7.84VDC Optional AUTO Will restart automa- Power Failure.
Failure undervoltage Restart Plug is tically when voltage
circuit on 5V installed on reaches 8.29VDC.
unregulated Micro Board An undervoltage
supply circuit on the Micro
Board monitors the
5VC unregulated
supply for an under-
voltage condition.
SHUTDOWN CAUSE
GOVERNING CONTROL FUNCTION
CONTROL CENTER DISPLAY
OPERATING
PROGRAMMED START-UP OF PROBABLE CAUSE
DAY OF TIME OF CAUSE OF METHOD OF
DESCRIPTION
POINT
SETPOINTS SYSTEM AFTER AND SERVICE
WEEK DAY SHUTDOWN RESTART
ON ON
BY OPERATOR SHUTDOWN REQUIRED
RISE FALL
TABLE 1 –
CAUSES OF NORMAL AND SAFETY SYSTEM SHUTDOWNS IN ACCORDANCE WITH THE MICROCOMPUTER CONTROL CENTER DISPLAY
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