FORM 160.54-M1(503)
143
YORK INTERNATIONAL
When logged in at SERVICE access level, the time
re main ing until the next Standby lubrication cycle is
dis played as NEXT OIL SEAL LUBRICATION = XX
HRS on the OIL SUMP Screen.
To Enable or Disable the Standby lubrication cycles,
proceed as follows:
1. At the keypad, log in at SERVICE access level
us ing access code 1 3 8 0 .
2. Select OIL SUMP Screen.
3. Use
◄
and
►
keys to select Enable or Dis able.
4. Press ENTER (
✔
) key.
HIGH CONDENSER PRESSURE WARNING
THRESHOLD
The condenser pressure at which a High Pressure warn-
ing message is displayed and the Pre-rotation Vanes are
inhibited from further opening, is programmable over
the range of 44.9 to 162.5 PSIG (R134a), or 84.0 to
246.3 PSIG (R22). The Default value for R134a is 162.5
PSIG. The Default for R22 is 246.3 PSIG. The Warn ing
message will clear and the PRV inhibit is removed when
the pressure decreases to 5 PSIG below the pro grammed
value. Proceed as follows to enter this value:
1. At the Keypad, log in at SERVICE access level
us ing access code 1 3 8 0.
2. Select CONDENSER Screen.
3. On the Condenser Screen, press HIGH PRES SURE
WARNING THRESHOLD key.
4. Using numeric keypad keys, enter desired value.
5. Press ENTER (
✔
) key.
BRINE LOW EVAPORATOR PRESSURE CUT OUT
On Brine cooling applications, the Low Evaporator Pres-
sure safety shutdown threshold is programmable over the
range of 25.0 to 54.3 PSIG (Default 54.3 PSIG) for R22
Refrigerant and 6.0 to 25.0 PSIG (Default 25.0 PSIG)
for R134a Refrigerant. The actual percentage of Brine
so lu tion determines this threshold. It is cal cu lat ed at the
YORK Factory and programmed at the time of man u -
fac ture. If the BRAM memory device on the Microboard
is re placed, the threshold will have to be pro grammed in
the
fi
eld. The threshold is logged on an adhesive label
attached to the inside of the OptiView Control Cen ter
door. Pro ceed as follows to enter this value:
1. At the Keypad, log in at SERVICE access level
us ing access code 1 3 8 0.
2. Select EVAPORATOR Screen.
3. On the EVAPORATOR Screen, press the BRINE
LOW EVAPORATOR CUTOUT key.
4. Using numeric keypad keys, enter desired value.
5. Press ENTER (
✔
) key.
LEAVING CHILLED LIQUID TEMPERATURE
CONTROL SENSITIVITY
This Setpoint adjusts the Leaving Chilled Liquid Tem-
per a ture control sensitivity. It determines the mag ni tude
of Pre-rotation Vanes (PRV) response to correct the er-
ror between the Leaving Chilled Liquid Tem per a ture
Setpoint and the actual liquid temperature leaving the
chiller. There are three selections as follows:
Normal
-
Provides standard control op er a tion. PRV
open and close pulses are stan dard du ra tions
for any giv en error. Long est allowed pulse
is 18 sec onds in duration. This se lec tion
will pro vide prop er op er a tion in most ap-
pli ca tions.
50%
-
Provides less sensitivity than the NOR MAL
se lec tion. The longest allowed open or close
pulse is limited to 50% of the max i mum al-
lowed with the NORMAL selection. This
pro vides less overall PRV move ment than
the NOR MAL selection. This se lec tion will
re duce PRV in sta bil i ty in short chilled liquid
loops, multi-pass chillers , parallel chill er
con
fi
g u ra tions and other ap pli ca tions that
cause PRV in sta bil i ty.
30% - Provides less sensitivity than the 50% se-
lec tion. The longest allowed open or close
pulse is limited to 30% of the maximum
al lowed with the NORMAL selection. This
provides less overall PRV movement than
the 50% se lec tion. It’s beneficial in the
same applications as the 50% selection,
but that re quire greater stability. This se-
lection avail able with Flash Memory Card
ver sion C.MLM.01.06.xxx and later or
C.MLM.04.02.xxx).
Flash Memory Card version C.MLM.01.06.xxx and lat er
or C.MLM.04.02.xxx have special vari able speed low
load op er a tion as fol lows: If the chiller is equipped with
the YORK com pres sor mo tor Variable Speed Drive and
the 50% or 30% Sensitivity is selected, the Pre-rotation
Vane (PRV) movement is reduced further than described
above when the chiller is operating at low load. When the
PRV po si tion is < 25% and the Leaving Chilled Liquid
Tem per a ture is within + 2.5 ºF of Setpoint, the maximum
23
Summary of Contents for MAXE OPTIVIEW YK
Page 28: ...YORK INTERNATIONAL 28 FORM 160 54 M1 503 Microboard FIG 7 MICROBOARD LD07776...
Page 60: ...YORK INTERNATIONAL 60 FORM 160 54 M1 503 Keypad FIG 32 KEYPAD CONNECTOR LD04074...
Page 61: ...FORM 160 54 M1 503 61 YORK INTERNATIONAL FIG 33 KEYPAD LD04075 LD04076 8...
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