York MILLENNIUM YCUL0016SC, Assembly, Installation, Operation & Maintenance

Page: 119 / 172

YORK INTERNATIONAL
FORM 150.63-NM1
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
following:
The line under the F is the cursor. If the day is correct,
press the ENTER/ADV key. The cursor will move un-
der the 0 in 08 hours. If the day is incorrect, press the
UP or DOWN arrow keys until the desired day is dis-
played 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, me-
ridian, month, day, and year may be programmed, when-
ever 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 – Condensed 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-DIS-
ABLED indicates that override mode has no effect.
– or –
Manual Override Mode is enabled. This is a service
function and when enabled, will allow the unit to start
when shut down on the daily schedule. It will automati-
cally 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
L E A D / L A G C O N T R O L
A U T O M A T I C
3
T O D A Y I S F R I 0 8 : 5 1 A M
1 M A Y 9 8