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Option 8 – Units Type
D I S P L A Y
I M P E R I A L
Display messages will show units of measure in
Imperial units ( °F or PSI ).
D I S P L A Y
S I
Display messages will show units of measure in SI
units ( ° C or Bar).
Option 9 – Lead/Lag Type (two systems only)
L E A D / L A G
M A N U A L
S Y S
SYS 1 selected as lead compressor.
L E A D / L A G
M A N U A L
S Y S
SYS 2 selected as lead compressor.
L E A D / L A G
A U T O M A T I C
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 10 – Condensed Fan Control Mode
F A N
C O N T R O L
D I S C H A R G E
Condenser fans are controlled by discharge pressure
only. This mode may only be chosen when discharge
pressure tranducers are installed, or if fan cycling is not
a concern.
F A N
C O N T R O L
A M B I E N T
&
YORK INTERNATIONAL
U N I T S
or
U N I T S
C O N T R O L
1
L E A D
or
C O N T R O L
2
L E A D
or
C O N T R O L
P R E S S U R E
or
D S C H
P R E S S
Condenser fans are controlled by ambient tem
and discharge pressure. This mode must be chosen if
the discharge pressure transducers are not installed, or
if the fan cycling is a concern.
Option 11 – Manual Override Mode
M A N U A L
O V E R R I D E
D I S A B L E D
T
his option allows overriding of the daily schedule that
is programmed. MANUAL OVERRIDE MODE-DISABLED
indicates that override mode has no effect.
or
M A N U A L
O V E R R I D E
E N A B L E D
Manual Override Mode is enabled. This is a service func-
tion and when enabled, will allow the unit to start when
shut down on the daily schedule. It will automatically be
disabled after 30 minutes.
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:
T O D A Y
I S
F R I
1
M A Y
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 cur-
sor is under the first letter/numeral of the
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.
FORM 150.62-NM2
perat
ure
M O D E
M O D E
0 8 : 5 1 A M
9 8
item.
77
2
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