York YCAS0130 manual Display Keys & Option Switches, Micro Panel Contents

Micro Panel Contents

FORM 201.19-NM1 (204)

3. DISPLAY KEYS & OPTION SWITCHES

3.1GENERAL

The Display keys provide direct access to retrieve com- monly required data about the operation of the chiller. This is particularly useful during commissioning, mon- itoring the operation of the chiller, diagnosing potential future problems and service troubleshooting.

When a Display key is pressed, the corresponding mes- sage will be displayed and will remain on the display until another key is pressed.

Displayed data is in “real-time” and is updated ap- proximately every 2 seconds. If updating of one of the messages is required faster than every 2 seconds, the appropriate key for the desired display can be pushed and held to provide updating every 0.4 seconds.

Display Messages may show characters indicating “greater than” (>) or “less than” (<). These characters indicate the actual values are greater than or less than the values which are being displayed, but are outside the ability of the micro to give an actual reading. This

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is unlikely to occur unless a problem exists in the mea- suring sensors or during extreme conditions.

The Display keys and the data available from each is as follows:

3.2CHILLED LIQUID TEMPS KEY

When the Chilled Liquid Temperatures key is pressed a display of chilled liquid temperatures leaving the chiller (LCHLT) and returning to the chiller (RCHLT) is pro- vided as follows:

L C H L T	=	4	4 .	2	°	F
R C H L T	=	5	4 .	0	°	F

If the key is pressed again, the following message will appear if an optional mixed chilled leaving temp sensor is installed for multi unit sequencing. If a sensor is not installed, pressing the key will have no effect.

M C H L T = 4 3 . 8 ° F

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