York YCAJ44HE8, Installation, Operation And Maintenance Manual, Page: 58 / 92

58 YORK INTERNATIONAL
The Run Time for SYS 2 since the last start is displayed.
This message provides a real time display of the time left
on the Load Timer. The Load Timer is a constantly recy-
cling timer that the micro utilizes in conjunction with
“rate control” and “temperature deviation from setpoint” to
determine when loading should occur.
This message provides a real timer display of the time
left on the Unload Timer. The Unload Timer is a con-
stantly recycling timer that the micro utilizes in conjunc-
tion with “rate control” and “temperature deviation from
setpoint” to determine when unloading should occur.
This message informs the operator what stage of loading
the chiller system is presently on as a result of com-
mands from the microprocessor. This is a coded number
and the steps must be decoded to be meaningful. The
decoding varies according to the number of stages pro-
grammed (Page 37). Tables for decoding the display
message are shown below:
5 STAGE
STEP
0: Both Compressors OFF
*1: Lead Compr Unloaded, Lag Compr OFF
*2: Lead Compr Unloaded, Lag Compr OFF
*3: Lead Compr Loaded, Lag Compr OFF
*4: Lead Compr Loaded, Lag Compr OFF
*5: Lead Compr Unloaded, Lag Compr Unloaded
*6: Lead Compr Unloaded, Lag Compr Unloaded
*7: Lead Compr Loaded, Lag Compr Unloaded
*8: Lead Compr Loaded, Lag Compr Unloaded
*9: Lead Compr Loaded, Lag Compr Loaded
*10: Lead Compr Loaded, Lag Compr Loaded
* On some “STEPS”, actual Loading will NOT change.
S Y S 2 R U N T I M E
0 S E C S
7 STAGE
STEP
0: Both Compressors OFF
1: Lead Compr Unloaded, Lag Compr OFF
*2: Lead Compr 1 Stage Loading, Lag Compr OFF
*3: Lead Compr 1 Stage Loading, Lag Compr OFF
4: Lead Compr 2 Stages Loading, Lag Compr OFF
5: Lead Compr 1 Stage Loading,
Lag Compr Unloaded
*6: Lead Compr 1 Stage Loading,
Lag Compr 1 Stage Loading
*7: Lead Compr 1 Stage Loading,
Lag Compr 1 Stage Loading
*8: Lead Compr 1 Stage Loading,
Lag Compr 1 Stage Loading
9: Lead Compr 2 Stages Loading,
Lag Compr 1 Stage Loading
10: Lead Compr 2 Stages Loading,
Lag Compr 2 Stages Loading
This message provides a real time display of the average
rate of change of leaving chilled water as seen by the
micro. A (-) or (+) sign is also shown to indicate a tem-
perature fall or a temperature rise.
This message informs the operator which system is in
the lead.
This message informs the operator that the micro has
commanded the auxiliary contacts (optional) for the
chilled water pump to close.
This message informs the operator that the micro
senses the outdoor ambient temperature is below 40°F
and is commanding the Evaporator Heater to turn on.
Once turned on, the heater will turn off at 45°F.
L O A D T I M E R
1 4 0 S E C S
U N L O A D T I M E R
1 2 2 S E C S
T E M P E R A T U R E D E M A N D
T E M P E R A T U R E R A T E
– 1 . 5 D E G F / M I N
L E A D S Y S T E M I S
S Y S T E M N U M B E R
E V A P O R A T O R W A T E R
P U M P S T A T U S O N
E V A P O R A T O R H E A T E R
S T A T U S O F F