FORM 150.44-NM4
57
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
recycling timer that the micro utilizes in conjunction with
rate control and temperature deviation from setpoint
to determine when loading should occur. The timer will
always start at 150 sec., however it may count to 0 at
a rate of up to 5 secs. per actual second of time.
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.
The timer will always start at 150 sec., however it may
count to 0 at a rate of up to 5 secs. per actual second
of time.
This message informs the operator what stage of load-
ing the chiller system is presently on as a result of com-
mands from the microprocessor. This is a coded num-
ber and the steps must be decoded to be meaningful.
The decoding varies according to the number of stages
programmed (Page 37). Tables for decoding the dis-
play 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.
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 aver-
age rate of change of leaving chilled water as seen by
the micro. A () or (+) sign is also shown to indicate a
temperature 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.
S Y S
2
R U N
T I M E
0
S E C S
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
6
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
1
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