YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls
YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls
YVAA Style A Air-Cooled Screw Liquid Chillers ... - Johnson Controls
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SECTION 8 - MICROPANEL<br />
Program Key Operation<br />
Various operating parameters are programmable by the<br />
user. These are modified by pressing the PROGRAM<br />
key and then the � (ENTER) key to enter Program<br />
Mode. A listing of the limits of the programmable values<br />
is found below. Note that the Imperial units are exact<br />
values, while Metric units are only approximate.<br />
The ▲ and ▼ (ARROW) keys are used to scroll<br />
through the user programmable values. A value may be<br />
changed by keying in the new value and pressing the �<br />
(ENTER) key to store the new value in memory. The<br />
cursor will be displayed on the screen when a number<br />
key is pressed. The first line of each message will indicate<br />
the chiller default (DEF) value), lowest acceptable<br />
programmable value (LO), and highest acceptable programmable<br />
value (HI). The user programmable value<br />
is programmed ON in the second line of the message.<br />
When the PROGRAM key is first pressed, the following<br />
display will appear indicating the user is in the program<br />
mode:<br />
PROGRAM MODE XXXX<br />
PRESS ENTER KEY TO CONTINUE<br />
Pressing the � (ENTER) key again will display the<br />
first programmable selection.<br />
114<br />
PROGRAM KEY<br />
FORM 201.28-NM1.1<br />
ISSUE DATE: 8/29/2012<br />
PROGRAM<br />
KEY<br />
LD10605<br />
Suction Pressure Cutout<br />
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX<br />
SUCTION PRESSURE CUTOUT = XXX.X PSIG<br />
The suction pressure cutout is protects the chiller from<br />
a low refrigerant condition. It also helps protect from<br />
a freeze-up due to low or no chilled liquid flow. However,<br />
it is only a back-up for a flow switch and cannot<br />
protect against an evaporator freeze under many conditions.<br />
This cutout is programmable and should generally<br />
be programmed for 1.65 barg (24 PSIG) for chilled<br />
water cooling.<br />
The cutout is programmable between 1.65 and 2.48<br />
barg (24.0 and 36.0 PSIG) in the Water Cooling mode<br />
and 0.34 and 2.28 barg (5.0 and 36.0 PSIG) in the Glycol<br />
Cooling mode. The default value for both modes<br />
will be 1.65 barg (24.0 PSIG).<br />
Low Ambient Cutout<br />
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX<br />
LOW AMBIENT TEMP CUTOUT = XXX.X °F<br />
The low ambient temp cutout allows programming the<br />
outdoor temperature at which it is desired to shut down<br />
the chiller to utilize other methods of cooling.<br />
The cutout is programmable between -18.9°C (-2.0°F)<br />
and 10.0°C (50°F) with a -3.9°C (25°F) default.<br />
JOHNSON CONTROLS