York YCAS0295EB, Installation Operation & Maintenance

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140 YORK INTERNATIONAL
FORM 201.19-NM7 (804)
the switches is important during the com mis sion ing 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. Option Switch Messages (S1-1 to S1-
8) will then be displayed in sequence. At the end of the
sequence, the display will automatically revert to the
fi rst Option Switch message.
The following is a detailed guide to programming the
Dip Switches together with the associated display mes-
sage provided for each selection when the Options key
is pressed:
SWITCH 1: Water / Glycol Cooling
Open:
Water Cooling Mode is for water cooling applications
and allows the chilled liquid leaving temperature set-
point to be programmed from 40 to 70 °F (4 to 21°C).
Se lect ing this mode also auto-programs the Low Chilled
Liq uid Cut-Out at 36°F (2°C) and the Suction Pressure
Cut-Out at 44 PSIG (3 bar).
Closed:
Glycol Cooling Mode is for brine/glycol applications with
setpoints below 40°F (4°C) and allows the chilled liquid
leaving temperature setpoint to be programmed from 10 to
70°F (-12 - 21°C). In this mode, the Low Chilled Liq uid
Cut-Out can be programmed from 8 to 36° F (-13 to 2°C)
and the Suction Pressure Cut-Out programmed from 20
to 70 PSIG (1 to 5 bar) for R-22 models and 5 to 70 PSIG
(0.3 to 5 bar) for R407C mod els.
SWITCH 2: Ambient Temp. Range Low Ambient
Cutout
Open:
Standard Ambient Mode auto-programs the Low Am bi ent
Cutout setting at 25°F (-4°C) and is not ad just able.
S 1 - 2 A M B I E N T C O N T R O L
S T A N D A R D
3.5 % MOTOR CURRENT KEY
Pressing the Motor Current key displays compressor
current for each system:
This display shows the average motor current in amps
and average compressor motor current as a percentage
of FLA. All values are approximate.
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, and 2.4
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-
pli ca ble, pressing the key again displays the values for
Systems 3 and 4 on larger models:
Display Limits : Maximum run hours 99,999
Maximum starts 99,999
Values roll over to zero, if the maximum limit is ex-
ceed ed.
These counters are zeroed at the fac-
to ry, but may in di cate run time and
number of starts logged dur ing fac-
to ry testing prior to shipment.
3.7 OPTIONS KEY &
DIP SWITCH SETTINGS
The Options key provides a display of op tions which are
programmed by the po si tions of the S1 Dip Switch es
on the Mi cro pro ces sor Board. Proper pro gram ming of
H R S 1 = 1 1 4 3 . 2 = 1 3 8 2
S T R 1 = 2 8 5 . 2 = 3 2 2
H R S 3 = 1 2 5 5 . 4 = 1 0 9 5
S T R 3 = 3 6 5 . 4 = 4 5 5
S 1 - 1 C H I L L E D L I Q U I D
W A T E R
S 1 - 1 C H I L L E D L I Q U I D
G L Y C O L
C O M P 1 = 6 3 A M P 8 5 % F L A
C O M P 2 = 3 0 A M P 4 1 % F L A
I S N C R N T L I M I T : N O N E
E M S C R N T L I M I T : N O N E
Micro Panel Contents