Daikin WMC Instruction Manual download pdf (Page 53)

www.DaikinApplied.com 53 IOM 1210-1 • MAGNITUDE

MODEL WMC CHILLERS

operaTIon

Conguring 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 reconguring 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 eld.

SET UNIT SPs (1) <D

Unit Enable = Off <C

Unit Mode = Cool <+

Source = Local <-

5. Press the UP or DOWN keys until the “Switches” option

is visible.

SET UNIT SPs (1) <D

Unit Enable = Off <C

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.

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 "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 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.

NOTE: The Alarm Log does not clear when the alarms are

cleared. Also, alarms cleared from the controller will

not be cleared from the OITS panel.

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Daikin WMC Instruction Manual Page 53

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