YORK INTERNATIONAL
64
LOCAL DISPLAY READ-OUT
Oper Data
The OPER DATA key also allows the user to scroll
through additional real time display information about
the chiller system which is not available from the DIS-
PLAY keys. This information covers a wide range of
data which includes fan status, loading status, liquid
line solenoid status, run time, etc. A total of 31 different
displays are offered.
When the OPER DATA key is pressed, the following
message will appear:
Repetitively pressing the ENTER key allows the opera-
tor to scroll through the 20 available displays.
In the information that follows, a sample message along
with an explanation of its meaning is provided for all 20
messages.
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 maxi-
mum stage of loading the MASTER (SYS 1 & 2) and
SLAVE (SYS 3 & 4) Module should presently be on as a
result of commands from the MASTER Microproces-
sor. This is a coded number and the steps must be de-
coded to be meaningful. This indication of loading may
be different from the actualy loading due to loading /
unloading timers that are not satisfied and preventing
any action or actual mixed leaving water temperature is
satisfied.
A table for decoding the display message is shown below:
STEP:
0: Both Compressors OFF
1: Lead Compr Unloaded, Lag Compr OFF
2: Lead Compr 1 Stage Loading, Lag Compr OFF
3: Lead Compr 2 Stages Loading, Lag Compr OFF
4: Lead Compr 3 Stages Loading, Lag Compr OFF
5: Lead Compr 2 Stages Loading,
Lag Compr Unloaded
6: Lead Compr 1 Stage Loading,
Lag Compr 1 Stage Loading
7. Lead Compr 2 Stages Loading,
Lag Compr 1 Stage Loading
8. Lead Compr 2 Stages Loading,
Lag Compr 2 Stages Loading
9. Lead Compr 3 Stages Loading
Lag Compr 2 Stages Loading
10. Lead Compr 3 Stages Loading,
Lag Compr 3 Stages Loading
PRESS ENTER TO
DISPLAY DATA
LOAD T I MER
140 SECS
UNLOAD T I MER
122 SECS
MASTER MAX LOAD = 6
S LAVE MAX LOAD = 0
MASTER ACT LOAD = 5
S LAVE ACT LOAD = 0
This message informs the operator what stage of load-
ing the MASTER (SYS 1 & 2) and SLAVE (SYS 3 & 4)
Module is actually on at any given time. This is a coded
number and the steps must be decoded to be mean-
ingful. A table for decoding the display follows:
STEP:
0: Both Compressors OFF
1: Lead Compr Unloaded, Lag Compr OFF
2: Lead Compr 1 Stage Loading, Lag Compr OFF
3: Lead Compr 2 Stages Loading, Lag Compr OFF
4: Lead Compr 3 Stages Loading, Lag Compr OFF
5: Lead Compr 2 Stages Loading,
Lag Compr Unloaded
6: Lead Compr 1 Stage Loading,
Lag Compr 1 Stage Loading
7. Lead Compr 2 Stages Loading,
Lag Compr 1 Stage Loading
8. Lead Compr 2 Stages Loading,
Lag Compr 2 Stages Loading
9. Lead Compr 3 Stages Loading
Lag Compr 2 Stages Loading
10. Lead Compr 3 Stages Loading,
Lag Compr 3 Stages Loading
* On some STEPS actual loading will NOT change due to the
steps not being present on the compressor.
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