York Millennium YCAS 310, Установка, эксплуатация и обслуживание

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YORK INTERNATIONAL
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4. PRINT KEYS
4.1 GENERAL
The Print keys provide access to two sets of informa-
tion either locally on the panel display, or, if an optional
printer is connected, remotely as hard copy printouts.
The Operating Data key provides a real-time list of sys-
tem operating data and programmed settings. The His-
tory key provides a comprehensive list of operating data
and programmed settings “at the instant of fault” on
each of the last nine faults (local display) or three faults
(remote printout) which occurred on the chiller.
4.2 OPER DATA KEY
If a remote printer is not connected, pressing the Op-
erating Data key allows the user to scroll through infor-
mation, on the 40 character display, which is not di-
rectly available from the Display keys on the panel.
If a remote printer is connected, pressing the Operating
Data key causes a snapshot to be taken of system op-
erating conditions and of the user programming selec-
tions. The data is stored in temporary memory, then trans-
mitted from the Microprocessor to the remote printer. As
the data is transmitted, it is erased from the memory.
Information available using the Operating Data key is de-
scribed in the following sections. In example displays, “#”
is used to indicate system number where appropriate:
4.3 OPERATING DATA – LOCAL DISPLAY MESSAGES
YCAS 2 SYSTEM MODELS:
When the Operating Data key is pressed, the following
message appears:
Repetitively pressing the Enter key will then scroll
through the following Common (whole chiller) Data and
individual System Data information displays:
Common Data:
This message shows the time remaining on the Load
Timer and the Unload Timer. Timers constantly recycle
and are used in conjunction with “rate control” and “tem-
perature deviation from setpoint” to determine when
loading should occur.
NOTE: These timers may appear not to count accord-
ing to actual time. This is normal and is con-
trolled by the micro to compensate for chang-
ing loading requirements.
The upper message gives the difference (error) be-
tween actual leaving chilled liquid temperature and the
programmed Target temperature. The lower message
gives the rate of change of the chilled liquid leaving
temperature in degrees per minute. A minus sign indi-
cates falling temperature. No sign indicates rising tem-
perature.
P R E S S E N T E R T O
D I S P L A Y D A T A
L O A D T I M E R 7 0 S E C
U N L O A D T I M E R 6 0 S E C
28164(b)A
T E M P E R R O R 1 2 . 0 ° F
T E M P R A T E 0 . 9 ° F / M
“PRINT”
KEYS