Clearing Alarms - McQuay WMC Installation, Operation And Maintenance Manual

Configuring the Control Source
In the event that the Building Automation System (BAS) – if
used – or the OITS panel has become inoperative, the user
can regain control of the chiller by reconfiguring the chiller
control source to "Switches." This can be accomplished with
the following set of commands entered from the unit controller
keypad (see "Figure 53: Controller Keypad" on page 48
for the location of various keys and key-pathways on the
controller):
1. Press the MENU key.
2. Select SET using the UP arrow key.
< ALARM
< VIEW
< SET
< COMMISSION
3. From the SET menu, select UNIT SPs using the RIGHT
arrow key.
SET < ALARM LIMITS
< UNIT SPs
< COMPRESSOR SPs
< TOWER SPs
4. With the SET UNIT SPs (1) screen visible, press the
ENTER key. This action will engage "edit" mode and
place the cursor on the "Source" selection field.
SET UNIT SPs (1)
Unit Enable = Off
Unit Mode = Cool
Source = Local
5. Press the UP or DOWN keys until the "Switches" option
is visible.
SET UNIT SPs (1)
Unit Enable = Off
Unit Mode = Cool
Source = Switches
6. Press the ENTER key to activate "Switches" mode.
The cursor will return to the top left of the screen and
navigation through screens can resume using the "scroll"
method.
SET UNIT SPs (1)
Unit Enable = Off
Unit Mode = Cool
Source = Switches
NOTE: The Unit Switch, Compressor 1 Switch, Compressor
2 Switch, External Switch, and Remote Switch – if
included – must all be closed in order to enable the
chiller. For more information on these switches and
unit enabling, see "Unit Enabling/Disabling" on page
20.
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Clearing Alarms

If the LEFT arrow key on the controller turns red, it is an
indication that there is an alarm. Alarms can be cleared from
the unit controller with the following commands (see
53: Controller Keypad" on page 48
keys and key-pathways on the controller):
<D
<C
<+
<-
<D
<C
<+
<-
NOTE: The Alarm Log does not clear when the alarms are
53
1. Press the MENU key.
2. Select ALARM using the LEFT arrow key.
< ALARM
< VIEW
< SET
< COMMISSION
3. From the ALARM menu, select ACTIVE using the LEFT
arrow. (Selecting LOG from the ALARM menu using the
RIGHT arrow will go to the Alarm Log. The controller
Alarm Log holds the last 25 alarms in chronological
sequence. The date, time, and alarm descriptor of each
alarm is recorded.)
ALARM < ACTIVE
< LOG
<
<
4. The controller will present a list of the active alarms. Use
the UP and DOWN arrow keys to scroll through each
active alarm. An example active alarms screen is shown
below.
*** ALARM ACTIVE ***
17:48 05/21
Compressor #2
Ground Fault
If no alarms are active or the bottom of the list is
reached, the controller will display the following
message:
NO MORE ALARMS
Press ENTER to clear
Press ALARM to View
5. As indicated, press the ENTER key to clear the alarms.
(Pressing the LEFT key will display the Alarm Log
screens.) This will attempt to clear all alarms; however, it
will not clear alarms that are still active. If the LEFT arrow
key on the controller is still red after pressing the ENTER
key, it is an indication that there are remaining issues
with the chiller. Fix these issues and then re-clear the
alarms until the red light no longer appears.
cleared. Also, alarms cleared from the controller will
not be cleared from the OITS panel.
IOM 1210-1 • MAGNITUDE
o
peraTIon
"Figure
for the location of various
MODEL WMC CHILLERS
®