Option 8 – Units Type
D I S P L A Y U N I T S
I M P E R I A L
Display messages will show units of measure in Imperial units (°F or PSI).
or
D I S P L A Y U N I T S
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 C O N T R O L
M A N U A L S Y S 1 L E A D
SYS 1 selected as lead compressor. or
L E A D / L A G C O N T R O L
M A N U A L S Y S 2 L E A D
SYS 2 selected as lead compressor. or
L E A D / L A G C O N T R O L
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 P R E S S U R E
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
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
FORM
Condenser fans are controlled by ambient tempera- ture and discharge pressure. This mode must be cho- sen if the discharge pressure transducers are not in- stalled, 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 M O D E
D I S A B L E D
This option allows overriding of the daily schedule that is programmed. MANUAL OVERRIDE
or
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
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 0 8 : 5 1 A M |
1 | M A Y 9 8 |
|
|
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 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.
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YORK INTERNATIONAL | 83 |
