Operating Hours / Start Counter Key; Options Key & Dip Switch Settings - York MILLENNIUM YCAS Installation Operation & Maintenance

Micropanel
I S N C R N T L I M I T :
E M S C R N T L I M I T :
On the second press of the of the Motor Current Key,
the current limit values as set by the ISN (Remote BAS
System) and EMS-PWM current limiting input are dis-
played, if they are active. See Sections 1.10, 2.4 and
3.5 for more details.
3.6 OPERATING HRS / START COUNTER KEY
When the Operating Hours / Starts Counter key is
pressed, the accumulated running hours and starts for
System 1 and 2 compressors are displayed. Where ap-
plicable, pressing the key again displays the values for
Systems 3 and 4 on larger models:
H R S 1 = 1 1 4 3 . 2
S T R 1 = 2 8 5 . 2
H R S 3 = 1 2 5 5 . 4
S T R 3 = 3 6 5 . 4
Display Limits : Maximum run hours 99,999
Maximum starts 99,999
Values roll over to zero, if the maximum limit is exceeded.
These counters are zeroed at the fac-
tory, but may indicate run time and
number of starts logged during factory
testing prior to shipment.
3.7 OPTIONS KEY & DIP SWITCH SETTINGS
The Options key provides a display of options which
are programmed by the positions of the S1 Dip Switches
on the Microprocessor Board. Proper programming of
the switches is important during the commissioning of
the chiller. The Options key can be used to verify the
Dip Switch positions without looking at or handling the
Microprocessor Board.
Each press of the key will scroll to the next option/dip
switch setting.
Three Option Switch Messages (S1-1 to S1-3) will then
be displayed in sequence. At the end of the sequence,
the display will automatically revert to the first Option
Switch message.
118
The following is a detailed guide to programming the
N O N E
Dip Switches together with the associated display mes-
N O N E
sage provided for each selection when the Options key
is pressed:
SWITCH 1 : Water / Brine Cooling
Open:
Water Cooling Mode is for water cooling applications
and allows the chilled liquid leaving temperature setpoint
to be programmed from 4 to 21°C (40 to 70 ºF). Select-
ing this mode also auto-programs the Low Chilled Liq-
uid Cut-Out at 2°C (36ºF) and the Suction Pressure Cut-
Out at 3 bar (44 PSIG).
= 1 3 8 2
= 3 2 2
Closed:
= 1 0 9 5
S 1 - 1
= 4 5 5
Brine Cooling Mode is for brine/glycol applications with
setpoints below 4°C (40ºF) and allows the chilled liquid
leaving temperature setpoint to be programmed from 10
to -12 - 21°C (70ºF). In this mode, the Low Chilled Liquid
Cut-Out can be programmed from -13 TO 2°C (8 to 36ºF)
and the Suction Pressure Cut-Out programmed from 1
to 5 bar (20 to 70 PSIG) for R-22 models and 0.3 to 5 bar
(5 to 70 PSIG) for R-407C models.
SWITCH 2 : Ambient Temp. Low Limit
Open:
S 1 - 2
Standard Ambient Mode auto-programs the Low Am-
bient Cutout setting at -4°C (25ºF) and is not adjustable.
Closed:
S 1 - 2
Low Ambient Mode allows the Low Ambient Cut-Out
to be programmed from -18 to 10ºC (0 to 50 ºF). Values
above -4°C (25ºF) can be used to automatically shut
down the chiller when direct cooling methods become
operational.
S 1 - 1 C H I L L E D
W A T E R
C H I L L E D
G L Y C O L
A M B I E N T
S T A N D A R D
A M B I E N T
L O W A M B I E N T
L I Q U I D
L I Q U I D
C O N T R O L
C O N T R O L
YORK INTERNATIONAL