York Millennium YCAS 316, Установка, эксплуатация и обслуживание, Страница: 78 / 144

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YORK INTERNATIONAL
• Saturated Suction Temperature is computed by
converting suction pressure to temperature.
• Slide Valve Position is computed internally by an
algorithm in the micro based on % FLA motor current,
actual condensing temperature, and programmed
condensing temperature for a particular chiller model.
NOTE: Slide valve position is approximate.
• Superheat is computed by subtracting saturated
suction temperature from suction temperature.
Shown below are the 6 pressure / temperature displays
(Also see Sys 1 information on previous page):
Minimum and maximum limits on the displays are shown
below. When a minimum value is exceeded, a “ < ” sign
will appear before the numerical value. In the case of
maximum limits, exceeding them will cause a “ > ” sign to
appear.
NOTE: Minimum and maximum values may change as
software (EPROM) revisions are made.
% Motor Current
Compressor current in amps, % FLA, individual % FLA of
each phase, ISN current limit, EMS current limit, and ISN
lag compressor start % will be displayed when this key is
pressed. The key must be pressed 5 times to scroll
through the 5 displays related to motor current. An
example of each display is shown below along with an
explanation of its meaning.
These two displays show the approximate average
current (% FLA) and the approximate % FLA of each
individual phase (L1, L2, and L3) on each compressor.
NOTE: Due to typical large variations in discharge
pressure, a compressor running “fully loaded”
may run over a wide range of currents and %
FLAs. Also, FLA is approximately equal to 1.2 x
RLA. This means amps equal to RLA of the
compressor will only be approximately 80% FLA.
Demand limit can be accomplished remotely by a YORK
ISN system or an external PWM (dry contact closure)
from an EMS system connected to the micro. This
display shows the % current limiting that may be in effect
from these devices.
This display indicates the ISN programmed value of %
FLA of the lead compressor, where the lag compressor
will start. This is user selectable. The lower the value of
“START %”, the less loaded the lead compressor will be
when the lag is called to start. See page 92 for more
information.
This display provides a readout of the approximate % FLA
current as measured by the 3 C.T.s and the equivalent
approximate full load amps.
NOTE: Due to typical large variations in discharge
pressure, a compressor running “fully loaded”
may run over a wide range of currents and %
FLAs. Also, FLA is approximately equal to 1.2 x
RLA. This means amps equal to RLA of the
compressor will only be approximately 80% FLA.
MIN. LIMITS MAX. LIMITS
OIL PRESSURE 208 PSID 0 PSID (O BARD)
SUCTION PRESSURE 0 PSIG (O BAR G) 199 PSIG (13.7 BAR G)
DISCHG. PRESSURE 0 PSIG (O BAR G) 399 PSIG (27.5 BAR G)
SUCTION TEMP. **9.0°F (-12.8°C) 84.2°F (29.0°C)
DISCHARGE TEMP. 40.3°F (4.6°C) 302.6°F (150.3°C)
OIL TEMP. 40.3°F (4.6°C) 240.0°F (115.6°C)
SAT. DISCHG. TEMP. -41.0°F (-40.6°C) 140.5°F (60.3°C)
SAT. SUCTION TEMP. -41.0°F (-40.6°C) 101.3°F (38.5°C)
SLIDE VALVE POS 0% 100%
SUPERHEAT **-81.5°F (-63.1°C) 60.9°F (16.1°C)
** NOTE: Below 9.0°F (-12.8°C), the Suction Temp. display will
disappear. This will in turn cause the Superheat display
to disappear.
S Y S 2 O I L = 5 2 P S I D
S P = 5 9 D P = 2 3 6 P S I G
S Y S 2 S U C = 4 3 . 5 ° F
D S C H = 1 2 2 . 9 ° F
O I L T E M P 2 = 8 7 . 3 ° F
S A T D I S H 2 = 1 2 5 . 7 ° F
S A T S U C T 2 = 2 9 . 2 ° F
S Y S 2 S L I D E V A L V E
P O S I T I O N = 1 0 0 %
S Y S 2 S U P E R H E A T
= 1 2 . 0 ° F
C O M P 1 = A V G ; P H L , 1 , 2 , 3
1 0 0 ; 9 9 , 1 0 1 , 1 0 1 % F L A
C O M P 2 = A V G ; P H L , 1 , 2 , 3
9 7 ; 9 7 ; 9 7 , 9 8 % 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
I S N L A G C O M P R E S S O R
S T A R T % N O N E
C O M P 1 = 2 8 1 A M P S 1 0 0 % F L A
C O M P 2 = 2 7 5 A M P S 9 7 % F L A
% MOTOR
CURRENT