FORM 160.52-O1
21
YORK INTERNATIONAL
manual oil pump speed control is in Service manual,
Form 160.49-M3 and should be performed only by a
qualified service technician.
NO. 2
PULLDN LEVEL = XXX%; SETP = XXX%; ACTUAL = XXX%
Displayed when there is a refrigerant level setpoint
pulldown (ramp) in effect.
PULLDN LEVEL
is the re-
frigerant level setpoint that is presently in effect.
SETP
is the refrigerant level setpoint that has been pro-
grammed by the service technician and
ACTUAL
is
the refrigerant level in the condenser. The pulldown
period is 15 minutes in duration. During the pulldown
period, a linearly increasing ramp is applied to the level
setpoint. This causes the setpoint to increase from 0%
to the programmed value over a period of 15 minutes.
After the 15 minutes have elapsed, the setpoint remains
the programmed value and this message is replaced
by the message
ACTUAL = XXX%; LEVEL SETP = XXX%
as described below.
A refrigerant level setpoint pulldown is put into effect
when the vanes are driven from a fully closed to an
open position, if the actual refrigerant level is less than
the level setpoint when the vane motor end switch
(VMS) opens. If the actual level is greater than the set-
point when the VMS opens, the level is controlled to
the programmed setpoint. Whenever the vanes go to
the fully closed position (VMS closed), any pulldown
that is in effect is cancelled.
or
NO. 2
ACTUAL LEVEL = XXX%; LEVEL SETP = XXX%
Displays
the actual refrigerant level in the condenser and the
refrigerant level setpoint programmed by the service
technician. This message replaces the previous mes-
sage after a refrigerant level setpoint pulldown period
terminates.
NO. 3
SAT TEMPS EVAP = XX.X°F; COND = XX.X°F
This is the
refrigerant saturation temperatures for the evaporator
and condenser.
NO. 4
DISCHARGE TEMP = XXX.X°F; OIL TEMP = XXX.X°F
NO. 5
HOP = XX.X PSIG; LOP = XX.X PSIG
This is the low oil
pressure (LOP) as measured at the oil sump and the
high oil pressure (HOP) as measured at the compres-
sor bearing input.
NO. 6
ACTUAL POS = XX MILS; REF = YY MILS
ACTUAL POS
is the distance between the high speed thrust collar
and the proximity probe that is used to measure the
position.
REF
is the reference position established at
time of compressor manufacture.
NO. 7
HIGH SPEED DRAIN TEMP = XXX.X °F
Temperature of oil
in high speed drain line.
NO. 8
OIL PUMP VSD = XXX.X HZ; PRS = XXX.X PSID
The pump
speed is modulated between 25 to 60Hz to maintain
the programmed OIL PRESSURE SETPOINT. PRS is
the actual gauge oil pressure.
To hold any of the above messages, press the
DIS-
PLAY DATA
key, then press the
DISPLAY HOLD
key.
The message will be displayed and updated every 2
seconds until the
DISPLAY DATA
key is pressed again,
whereupon the next message is displayed. To return
to the normal foreground messages, press the
DIS-
PLAY HOLD
key.
HISTORY PRINT
This key is used to initiate a history
print to the optional printer. Refer to Form 160.49-N2
for operation of this key.