FORM 150.40-NM20
19
YORK INTERNATIONAL
To maintain a remote setpoint, EMS Pulse Width
Modulation input (terminals 11 and 12) on the Digital
Input Board must be refreshed every 30 minutes or less
(20 minutes is recommended). In other words, to main-
tain the 56°F RWT setpoint, the contacts between ter-
minals 11 and 12 must be closed for a period of 4.33
seconds every 20 minutes. If this is not refreshed at
least every 30 minutes, the Micro Logic Board will take
this as a signal to change the RWT setpoint back to the
original setpoint of 51° on the Control Panel.
ANNUNCIATION ALARM CONTACTS (OPTIONAL)
YORK can supply alarm contacts which will de-energize
to function as a warning if unit malfunction occurs. A 28
volt external alarm circuit (by others) must be wired into
the YORK supplied alarm circuit. If the alarm circuit is
applied to chillers used for critical duty (such as pro-
cess duty, or cooling other critical equipment) and the
alarm circuit should fail to function, YORK will not be
(YCHA100)
liable for damages. Any inductive devices (relays) wired
into the Alarm circuitry must be suppressed. Use P/N
031-00808B suppressor.
EXTERNAL SYSTEM MONITORING AND DlAG-
NOSTICS (OPTIONAL)
RS-232 (or equivalent) Serial Communication Out-
put Board
This port on the bottom right of the Logic Board (J6)
allows service personnel to obtain a printout of unit con-
ditions at any time. To make use of this option, contact
YORK Service or Marketing for recommended printers.
A printout can be requested by pressing the “Press To
Print” pushbutton on the Control Panel. This allows ser-
vice personnel or the customer to obtain system pa-
rameters on a periodic basis. *
A print example is shown below.
* Once the printout is obtained, the printer should be disconnected
from the panel at J6.
** The values for System 2 will not relate to anything in the sys-
tem.
YORK RECIPROCATING CHILLER
MICROCOMPUTER CONTROL CENTER
SYSTEM STATUS
NO SYSTEM FAULTS
RETURN WATER TEMPERATURE 55.4 DEGF
LEAVING WATER TEMPERATURE 44.0 DEGF
SYSTEM 1 OIL TEMPERATURE 44.0 DEGF
SYSTEM 2 OIL TEMPERATURE 130.8 DEGF
LOW WATER TEMP CUTOUT 36.0 DEGF
TEMPERATURE SETPOINT 54.0 DEGF
OUTSIDE AIR TEMPERATURE 90.2 DEGF
LOW AMBIENT TEMP CUTOUT 35.0 DEGF
SYSTEM 1 MOTOR CURRENT 87 %FLA
SYSTEM 1 SUCTION PRESSURE 66 PSIG
SYSTEM 1 OIL PRESSURE 44 PSID
SYSTEM 1 DISCHARGE PRESSURE 197 PSIG
SYSTEM 2 MOTOR CURRENT 87 %FLA**
SYSTEM 2 SUCTION PRESSURE 59 PSIG**
SYSTEM 2 OIL PRESSURE 51 PSID**
SYSTEM 2 DISCHARGE PRESSURE 191 PSIG**
LOW SUCTION PRESSURE CUTOUT 44 PSIG
TEMPERATURE CONTROL RANGE 54.0 DEGF
TO 48.0 DEGF
SYSTEM 1 LIQUID LINE SOL NO
SYSTEM 2 LIQUID LINE SOL NO**
SYSTEM 1 LOADED NO
SYSTEM 2 LOADED NO**
RUN PERMISSIVE YES
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