York YCAS0130 manual Automatic/Manual Power Failure Restart, 170

Micro Panel Contents

If manual control is desired, press the or key. One of the following messages will be displayed:

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
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

System 1 or 2 can be selected as the lead by pressing the or key. The ENTER key must be pressed to save the selection in memory.

Automatic/Manual Power Failure Restart

P O W E R F A I L R E S T A R T A U T O M A T I C

The chiller may be selected for “Automatic” or “Man- ual” restart after a power failure. In most instances, “Automatic Restart” is preferred to allow the chiller to automatically restart when power is reapplied after a power failure. When “Manual” is selected, the chiller will not operate after re-application of power until the ON / OFF Rocker Switch on the keypad is cycled OFF and then ON.

FORM 201.19-NM1 (204)

Press the Program key again, key in the numbers “6140”, then press Enter. As the code is being keyed in, the digits are not displayed but are shown as “*” as shown:

P R O G R A M M O D E

* * * *

When the Enter key is pressed, the following message will appear:

D E F A U L T	S E T P O I N T S ?
1 = Y E S	, 0 = N O,	1

Key in a “1” for if default setpoints are required, or a “0” for individually programmed values, then press Enter to store the selection into memory.

If individual programming is selected (0), the display will now return to the Status display. If a default setpoints have been selected, the display will momentarily display the message shown below before returning to the Status display:

P R O G R A M O P T I O N S S E T

T O D E F A U L T V A L U E S

In most applications, it is undesirable to use Manual Reset on power failure since chillers normally are required to auto-restart after a power failure.

8.3PROGRAMMING "DEFAULT" VALUES

Programmable values may be individually programmed at start-up or any time thereafter. For ease of programming, once the type of refrigerant is programmed under the Pro- gram key and in the Service Mode, a “defaults password” may be programmed to automatically program default values into memory. This will preset all programmable values under the Program key to values that will allow operation of the chiller under most operating conditions. This allows quick start-up programming for typical chilled water applications.

To program the default values into memory, first press the PROGRAM key followed by the ENTER key, to program the “refrigerant type” .

It is often easier to select Default Setpoints and then reprogram a few that require changing rather than programming each individual value from scratch.

170 YORK INTERNATIONAL