York YT Specifications download pdf (Page 101)

FORM 160.55-O1 (402)

101

YORK INTERNATIONAL

“OIL - HIGH DIFFERENTIAL PRESSURE”

The differential oil Pressure increased to > 60.0 PSID

while the oil pump was running. The differential oil

pressure is the difference between the output of the

Sump Oil Pressure Transducer (system low pressure)

and the output of the Pump Oil Pressure Transducer

(system high pressure). The chiller can be started after

the differential oil pressure decreases to < 60.0 PSID

and the COMPRESSOR switch is placed in the Stop-

reset (O) position.

“CONTROL PANEL – POWER FAILURE”

A Control Power failure has occurred. If the power fail-

ure duration was < the duration of the applicable

“Coastdown” period (2.5 minutes standard; 15 minutes

steam turbine), the remainder of the “Coastdown” is

performed upon restoration of power. The chiller can

be started after the COMPRESSOR switch is placed

in the Stop-reset (O) position. This message can indi-

cate a Cycling (auto-restart after power failure) or Safety

(manual restart after power failure) shutdown, depend-

ing upon Control Center configuration. It indicates a

Cycling shutdown when displayed in orange characters;

Safety shutdown when displayed in red characters. The

OptiView Control center is configured for auto-restart

or manual restart after power failure by a qualified Ser-

vice technician following instructions in YORK Service

Manual 160.55-M1.

“MOTOR OR STARTER – CURRENT

IMBALANCE”

The Motor Starter detected that the three phase com-

pressor motor current imbalance was > 30% continu-

ously for 45 seconds. The imbalance is not checked

until the chiller has been running for at least 45 seconds

and the average of the three phases of motor current is

> 80% of the programmed 100% chiller Full Load Amps.

The average is calculated as: Iave = (Ia+Ib+Ic) 3.

The imbalance is calculated as:

(Ia-Iave) + (Ib-Iave) + (Ic-Iave)

x 100

2(Iave)

“WATCHDOG – SOFTWARE REBOOT”

The Microboard’s software Watchdog initiated a Mi-

croprocessor reset because it detected that a portion of

the chiller operating Program was not being executed.

The result of this reset is a Safety shutdown and re-

initialization of the Program. This is generally indicative

of a severe electrical power disturbance or impending

Microboard Failure. The chiller can be started after the

COMPRESSOR switch is placed in the Stop-Reset

(O) position.

“SURGE PROTECTION – EXCESS SURGE”

(Flash Memory Card version C.MLM.02.02.xxx

and later)

(Applies only if Surge Protection SHUTDOWN fea-

ture is Enabled) The Surge Window Count surge events

exceeded the Count Limit setpoint. If the Surge Protec-

tion Extended Run feature is Disabled, the chiller

shutsdown as soon as the count exceeds the limit. If the

Extended Run feature is Enabled, this shutdown occurs

only if the count exceeds the limit at completion of the

10 minute Extended Run period. The chiller can be

started after the COMPRESSOR Switch is placed in

the Stop-Reset (O) position.

MOD “B” SOLID STATE STARTER

SAFETY SHUTDOWN MESSAGES

“LCSSS SHUTDOWN – REQUESTING FAULT

DATA...”

The Liquid Cooled Solid State Starter Logic/Trigger Board

has shut down the chiller but the Control Center has not

yet received the cause of the fault from the LCSSS, via

the serial communications link. The LCSSS shuts down

the chiller by opening the Motor Controller LCSSS Stop

Contacts (K1 relay located on the Logic/Trigger Board

and connected between TB6-16 and TB6-53 in the Con-

trol Center). The Microboard, in the Control Center, then

sends a request for the cause of the fault to the Logic/

Trigger Board over the serial communications link. Since

serial communications are initiated every 2 seconds, this

message is typically displayed for a few seconds and then

replaced with the one of the below listed fault messages.

“LCSSS – HIGH INSTANTANEOUS CURRENT”

The Liquid Cooled Solid State Starter Logic/Trigger

Board detected that the compressor motor current in

any phase exceeded 1.1(1.414xRMS value of the pro-

grammed Start Current) for a minimum of 1 second.

The chiller can be started after the COMPRESSOR

switch is placed in the Stop-Reset (O) position.

“LCSSS – HIGH TEMPERATURE PHASE X –

RUNNING”

The Liquid Cooled Solid State Starter Logic/Trigger

Board has detected the temperature of phase A, B or C

(designed as X in the message) Silicon Controlled Rec-

tifier (SCR) Modules has exceeded 212°F while the

chiller was running. The safety can be reset after all

SCR temperatures are < 210°F and the COMPRES-

SOR switch is placed in the Stop-Reset position (O).

However, the chiller cannot be started until all SCR tem-

peratures are < 109°F. During the shutdown, the starter

cooling pump runs until the temperature is < 109°F.

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York YT Specifications Page 101

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