York MILLENNIUM YCUL0045SC, Installation Operation & Maintenance

Page: 119 / 172

YORK INTERNATIONAL
FORM 150.63-NM2
119
CLOCK
The CLOCK display shows the current day, time, and
date. Pressing the CLOCK key will show the current
day, time, and date.
It is important that the date and time be correct, other-
wise the daily schedule will not function as desired if
programmed. In addition, for ease of troubleshooting via
the History printouts, the day, time, and date should be
correct.
To change the day, time, and date press the CLOCK
key. The display will show something similar to the fol-
lowing:
The line under the F is the cursor. If the day is correct,
press the ENTER/ADV key. The cursor will move under
the 0 in 08 hours. If the day is incorrect, press the UP or
DOWN
arrow keys until the desired day is displayed
and then press the ENTER/ADV key at which time the
day will be accepted and the cursor will move under the
0. In a similar manner, the hour, minute, meridian, month,
day, and year may be programmed, whenever the cursor
is under the first letter/numeral of the item.
Jumper J11 on the microboard must be
set to the “CLKON” position to turn on
the clock. If this is not done, the clock will
not function.
In this mode the micro determines which system is as-
signed to the lead and lag. A new lead/lag assignment
is made whenever all compressors shut down. The mi-
cro will then assign the “lead” to the compressor with
the shortest average run time.
Option 9 – Condenser Fan Control Mode
Condenser fans are controlled by discharge pressure
only. This mode may only be chosen when discharge
pressure transducers are installed, or if fan cycling is
not a concern.
– or –
Condenser fans are controlled by ambient temperature
and discharge pressure. This mode must be chosen if
the optional discharge pressure transducers are not in-
stalled, or if the fan cycling is a concern.
Option 10 – Manual Override Mode
This option allows overriding of the daily schedule that is
programmed. MANUAL OVERRIDE MODE-DISABLED
indicates that override mode has no effect.
– or –
Manual Override Mode is enabled. This is a service func-
tion and when enabled, will allow the unit to start while
shut down on the daily schedule. It will automatically be
disabled after 30 minutes.
M A N U A L O V E R R I D E M O D E
D I S A B L E D
F A N C O N T R O L
D I S C H A R G E P R E S S U R E
F A N C O N T R O L
A M B I E N T & D S C H P R E S S
M A N U A L O V E R R I D E M O D E
E N A B L E D
T O D A Y I S F R I 0 8 : 5 1 A M
1 M A Y 9 8
3
L E A D / L A G C O N T R O L
A U T O M A T I C