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YORK INTERNATIONAL
110
FORM 160.55-O1 (604)
VSD Logic Board is pressed and the COMPRESSOR
switch is placed in the Stop-reset (O) position.
"VSD – HIGH PHASE C INVERTER BASE-
PLATE TEMPERATURE”
(VSD part number 371-03789-xxx (503HP 60Hz; 419HP
50Hz (Flash Memory Card version C.MLM.02.04.xxx
and later)
The chiller has shutdown because the baseplate tempera-
ture has increased to >158 ºF. The chiller can be stated
after the fault condition clears, the RESET button on the
VSD Logic Board is pressed and the COMPRESSOR
switch is placed in the Stop-reset (O) position.
“VSD – PRECHARGE LOCKOUT”
If the VSD fails to make Pre-charge, the Pre-charge
re lay shall drop out for 10 sec onds during which time
the VSD’s fans and water pumps shall remain en er gized
in order to permit the Pre-charge resistors to cool. Fol-
low ing this 10-second cool down period, Pre-charge
shall again be initiated. The VSD shall attempt to make
Pre-charge 3 consecutive times. If the VSD fails to
make Pre-charge on 3 consecutive tries, the unit will
shut down, lockout and display this message. The chill er
can be start ed after the COMPRESSOR switch is placed
in the Stop-reset (O) position.
“HARMONIC FILTER – HIGH HEATSINK TEM-
PER A TURE”
(Style D VSD)
The Harmonic Filter power assembly has one heatsink
thermistor on the 351 and 503 HP units and two heatsink
ther mistors on the 790 HP units. If the temperature on
any heatsink exceeds 167°F, the unit will shut down.
This mes sage is usually an indication of a low cool-
ant level in the VSD cooling loop. The chiller can be
start ed after the fault condition clears, the OVERTEMP
RE SET button on the Filter Logic Board is pressed and
the COM PRES SOR switch is placed in the Stop-reset
(O) position.
“HARMONIC FILTER – HIGH BASEPLATE
TEM PER A TURE”
(Applicable to VSD with part number 371-02767-
XXX (60 Hz) and 371-03700-XXX (50 Hz))
(Requires Flash Memory Card version C.MLM.-
02.02A.xxx and later)
This shutdown occurs when the Baseplate tem per a ture
ex ceeds 174ºF (79ºC). The chiller can be started after the
fault condition clears, the OVERTEMP RESET button
on the Filter Logic Board is pressed and the COMPRES-
SOR Switch is placed in the Stop-reset po si tion (O).
“HARMONIC FILTER – HIGH BASEPLATE
TEMPERATURE”
(VSD part number 371-03789-xxx (503HP 60Hz; 419HP
50Hz (Flash Memory Card version C.MLM.02.04.xxx
and later)
The chiller has shutdown because the Baseplate tem-
perature has increased to >194 ºF. The chiller can be
started after the fault condition clears, the OVERTEMP
reset button on the Filter Logic Board is pressed and
the COMPRESSOR switch is placed in the stop-reset
(O) position
“HARMONIC FILTER – HIGH TOTAL
DEMAND DISTORTION”
This shutdown indicates the Þ lter is not operating cor-
rect ly and the input current to the VSD/Filter is not si-
nu so i dal. This shut down will occur if the TDD ex ceeds
25% con tin u ous ly for 45 seconds. TDD is an ac ro nym
for Total De mand Distortion, a term deÞ ned by the IEEE
Std 519-1992 stan dard as the “total root-sum-square har-
monic cur rent distortion, in percent of the maximum
demand load current (15 or 30 min de mand)”. In the
Filter option sup plied by YORK, the displayed TDD is
the total RMS val ue of all the har mon ic cur rent sup plied
by the main power to the VSD di vid ed by the chiller
Full Load Amps, in per cent. A standard VSD, less the
op tion al Þ lter typ i cal ly has an input current TDD level
on the order of 28-30%. The chiller can be started after
the COM PRES SOR switch is placed in the Stop-re set
position (O).
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