FORM 160.52-O1
9
YORK INTERNATIONAL
To Display
CHILLED LIQUID TEMPERATURES
:
Press
CHILLED LIQUID TEMPS
display key as de-
scribed on page 7 to produce the following alphanu-
meric display message:
CHILLED LEAVING = XXX.X°F, RETURN = XXX.X°F
To Display
REFRIGERANT PRESSURE:
Use
REFRIGERANT PRESSURE
display key as de-
scribed on page 7 to produce the following alphanu-
meric display message:
EVAP = XXX.X PSIG; COND = XXX.X PSIG
To Display
OIL PRESSURE:
Use
OIL PRESSURE
display key as described on page
7 to produce the following alphanumeric display mes-
sage:
OIL PRESSURE = XXXX.X PSID; SETP=XXXX.XPSID
The differential pressure displayed is the pressure dif-
ference between the high side oil pressure transducer
(output of oil filter) and the low side oil pressure trans-
ducer (compressor sump). Displayed value includes
offset pressure derived from auto-zeroing during
START SEQUENCE INITIATED. A qualified Service
Technician using procedure in Service Manual 160.49-
M2 has programmed (between 20 and 45 PSID) the oil
pressure setpoint (SETP). If either transducer is out-
of-range,
XX.X
is displayed. Oil pressure is calcu-
lated as follows:
______ PSID = (HOP LP) OFFSET PRESSURE
OFFSET PRESSURE:
Pressure differential between
the HOP transducer and LOP transducer outputs dur-
ing a 3 second period beginning 10 seconds after the
start of START SEQUENCE INITIATED. During this
time, the transducers will be sensing the same pres-
sure and their outputs should indicate the same pres-
sure. However, due to accuracy tolerances in trans-
ducer design, differences can exist. Therefore, to com-
pensate for differences between transducers and as-
sure differential pressure sensing accuracy, the
OFF-
SET PRESSURE
is subtracted algebraically from the
differential pressure. The offset pressure calculation will
not be performed if either transducer is out-of-range.
The offset value will be taken as 0 PSI in this instance.
To Display
OPTIONS:
This key is not used.
NO OPTIONS INSTALLED
is displayed when this key is pressed.
To Display
SSS MOTOR CURRENT / VOLTS
:
(Solid State Starter Applications Only)
If chiller is equipped with a YORK Solid State Starter,
use
SSS MOTOR CURRENT / VOLTS
key to display
3-phase compressor motor current and 3-phase Solid
State Starter input line voltage.
Continuously pressing this key will display the motor
current and line voltage alternately. When used with
the
DISPLAY HOLD
key, motor current and line volt-
age will alternately be displayed each time this key is
pressed. The messages are as follows:
A AMPS = XXXX; B AMPS = XXXX; C AMPS = XXXX
V A-B = XXXX; V B-C = XXXX; V C-A = XXXX
If chiller is not equipped with a Solid State Starter, this
key produces the following message:
SOLID STATE STARTER NOT INSTALLED
In
PROGRAM
mode, this key is used to display the
applicable line voltage range (200-208VAC, 220-
240VAC, 380VAC, 400VAC, 415VAC, 440-480VAC,
500-600VAC, Supply Voltage Range Disabled). The
correct line voltage range is programmed at the YORK
factory and is checked by the service technician at start-
up. For security reasons, a special access code is re-
DISPLAY
READS
CONDENSER PRESS. = < 6.8 PSIG, or > 300 PSIG XX.X PSIG
EVAPORATOR PRESS. = < 50 PSIG, or > 125 PSIG XX.X PSIG
EVAP. PRESS. (BRINE) = < 25 PSIG, or > 100 PSIG XX.X PSIG
HOP TRANSDUCER
= < 59.1 PSIG, or > 314.9 PSIG XX.X PSIG
LOP TRANSDUCER
= < 23.2 PSIG, or > 271.8 PSIG XX.X PSIG
DISCHARGE TEMP.
= < 20.3°F;
> 226.4°F
XXX.X°F
OIL TEMP.
= < 20.3°F;
> 226.4°F
XXX.X°F
LEAVING CONDENSER
WATER TEMP.
= < 8.4°F; > 134.1°F
XXX.X°F
ENTERING CONDENSER
WATER TEMP.
= < 8.4°F; > 134.1°F
XXX.X°F
LEAVING EVAPORATOR
= < 0°F
XX.X°F
WATER TEMP.
= > 81.1°F
XX.X°F
ENTERING EVAPORATOR
= < .1°F
XX.X°F
WATER TEMP.
= > 93°F
XX.X°F
FIG. 4
SYSTEM PARAMETERS OUT OF
RANGE READINGS
