FORM 201.10-NM1
113
YORK INTERNATIONAL
If the anti-recycle timer is preventing a start, the timer
position in seconds may be viewed by pressing the “STA-
TUS” key. A sample display follows:
Anti-Coincidence Timer
The Anti-Coincidence Timer assures that 2 compressors
can never start simultaneously which limits excessive
current demand. A one minute time delay will always
separate compressor starts.
The Anti-Coincidence Timer can be viewed, when it is
active, by pressing the “STATUS” key. A sample display
is shown below:
Pumpdown Controls
Each compressor has a pumpdown on start-up and a
pumpdown on shutdown feature. Pumpdown is incorpo-
rated into the control scheme to assure that liquid does
not enter the compressor on start-up, which could cause
damage to the compressor.
The pumpdown on start-up control eliminates the need
for recycling pumpdown. Eliminating recycling pumpdown
saves energy, reduces the number of starts, and saves
wear on the compressor/motor.
On start-up, the Compressor Slide Valve Unload Sole-
noid will be energized to unload the compressor and the
system will be pumped down to the programmed cut-out
or will pump down for 30 seconds, whichever comes first,
before the Liquid Line Solenoid and Economizer Liquid
Supply Solenoid is energized.
Pumpdown on normal shutdown is incorporated to fur-
ther assure that liquid does not accumulate in the evapo-
rator. On shutdown, the Compressor Slide Valve Unload
Solenoid will be energized to unload the compressor and
the Liquid Line Solenoid and Economizer Liquid Supply
solenoid will de-energize. The compressor will continue
to operate until the suction pressure reaches the suction
pressure cut-out or a period of 30 seconds elapses.
Pumpdown on shutdown will occur on “normal” shutdowns.
Normal shutdowns include non-safety shutdowns where
cooling demand has been satisfied or when a system
switch on the Microprocessor Board is turned off (does
not apply to the UNIT Switch).
Pumpdown on shutdown will also occur when a flow switch
opens or run permissive is lost and when a Daily Sched-
ule or a Remote Shutdown is called for.
The following message will be displayed on the STATUS
display when a non safety shutdown due to cooling de-
mand, micro board system switch shutdown, or a run
permissive/flow switch shutdown occurs. After pumpdown
is complete, the respective shutdown message will be
displayed for the system.
No display indicating a pumpdown will be viewed when a
Daily Schedule or a Remote Shutdown occurs. Shutdown
messages for Remote and Daily Schedule shutdown will
be displayed during pumpdown and after shutdown for
these two messages.
Manual pumpdown from the control panel is not possible.
S Y S
1
A R
T M R
1 0 2
S
S Y S
2
A R
T M R
1 0 2
S
S Y S
1
C O M P
R U N N I N G
S Y S
2
A C
T M R
5 6
S
S Y S
1
P U M P I N G
D O W N
S Y S
2
P U M P I N G
D O W N
Summary of Contents for Millennium YCAS 216X
Page 11: ...FORM 201 10 NM1 11 YORK INTERNATIONAL YCAS 140 246 DIMENSIONS English LD01444 LD01446...
Page 13: ...FORM 201 10 NM1 13 YORK INTERNATIONAL YCAS 140 246 DIMENSIONS SI LD01440 LD01442...
Page 15: ...FORM 201 10 NM1 15 YORK INTERNATIONAL YCAS 216X 266X DIMENSIONS English LD01454 LD01454...
Page 17: ...FORM 201 10 NM1 17 YORK INTERNATIONAL YCAS 216X 266X DIMENSIONS SI LD01450 LD01448...
Page 33: ...FORM 201 10 NM1 33 YORK INTERNATIONAL 28514A FILTER DRYER LIQUID STOP VALVE...
Page 37: ...FORM 201 10 NM1 37 YORK INTERNATIONAL LD01285 FIG 3 SCREW CHILLER REFIGERANT FLOW DIAGRAM...
Page 59: ...FORM 201 10 NM1 59 YORK INTERNATIONAL FIG 11 CONTINUED LD01465 D...
Page 61: ...FORM 201 10 NM1 61 YORK INTERNATIONAL FIG 12 CONTINUED LD01458 D...
Page 69: ...FORM 201 10 NM1 69 YORK INTERNATIONAL FIG 16 CONTINUED LD01206 D...
Page 71: ...FORM 201 10 NM1 71 YORK INTERNATIONAL FIG 17 CONTINUED LD01202 D...
