Daikin WMC User Manual

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.

Daikin WMC Specifications

General

Brand	Daikin
Model	WMC
Category	Chiller
Language	English

Summary

Pre-Start Checklist

Chilled Water Checklist

Checklist items for chilled water system readiness prior to startup.

Condenser Water Checklist

Checklist items for condenser water system readiness prior to startup.

Electrical Checklist

Checklist items for electrical system readiness prior to startup.

Miscellaneous Checklist Items

General readiness checklist items for chiller installation.

Introduction

Hazard Identification Information

Describes DANGER, WARNING, and CAUTION symbols used in the manual.

General Description

Overview of Magnitude® chillers, features, and capabilities.

Nomenclature

Explanation of chiller model naming conventions and codes.

The Control System

Overview of the MicroTech® II control system components.

Operator Interface Touch Screen (OITS)

Primary device for unit monitoring, control, and data entry.

Unit Controller

Controller for acquiring and processing chiller operation data.

Installation

Receiving and Handling

Procedures for inspecting, rigging, and moving the chiller unit.

Location Requirements

Guidelines for selecting an appropriate installation site for the chiller.

Clearance Requirements

Minimum space needed around the unit for service and ventilation.

Unit Dimensions and Shipping Weight

Physical size and weight specifications for various chiller models.

Mounting Instructions

Guidance on securing the chiller to its base or structural support.

Water Piping Requirements

Specifications for connecting chilled and condenser water piping.

Condenser Water Temperature Control

Methods for managing condenser water temperature for optimal performance.

Relief Valves

Description and function of safety pressure relief valves.

Field Insulation

Requirements and guidance for field-applied thermal insulation.

Field Power Wiring

Instructions and safety precautions for electrical power connections.

Wiring Index

Reference for all wiring diagrams, legends, and field connections.

Controller Box Wiring

Diagram detailing electrical connections within the controller box.

Power Box Wiring

Diagrams for single and multi-point power distribution wiring.

Communication Setup for Multiple Chillers

Steps for interconnecting multiple chillers via LAN.

Operation

Operator Responsibilities

Duties and recommendations for chiller operators during startup and operation.

Sequence of Unit Operation

Step-by-step process of chiller startup, loading, and shutdown.

Unit Enabling/Disabling

Methods to start, stop, and disable the chiller and its compressors.

Operator Interface Touch Screen (OITS)

Guidance on using the OITS panel for monitoring and control.

Home View Screen

Description of the primary display screen on the OITS.

Detail View Screen

Screen displaying detailed operational data for the chiller and compressors.

SET SCREENS

Accessing and modifying unit setpoints via the OITS.

TIMERS Setpoints

Configuration of operational timers for various functions.

ALARMS Setpoints

Setting alarm thresholds, limits, and trip points.

WATER Setpoints

Configuration of water temperature setpoints and related parameters.

HISTORY Screens

Accessing and viewing logged operational and alarm data.

Possible Alarms and Events

Categorization and explanation of unit alarms and events.

The Controller

Information on the unit controller interface and navigation.

Editing Fields on the Controller

Procedure for modifying parameters using the controller keypad.

Setting Passwords

How to access controller functions using operator or manager passwords.

Configuring the Control Source

Setting the primary control input for the chiller.

Clearing Alarms

Procedure to acknowledge and clear active alarms on the controller.

Controller Setpoints

Summary of all available controller setpoints and their parameters.

Maintenance

Chiller Maintenance Procedures

General maintenance tasks and safety precautions for the chiller.

Water Treatment Importance

Guidelines for water treatment to prevent corrosion and scaling.

Seasonal Shutdown Procedures

Steps for preparing the chiller for periods of non-operation.

Seasonal Startup Procedures

Steps for preparing the chiller for operation after shutdown.

Recommended Maintenance Schedule

Overview of recommended maintenance tasks and their frequencies.

Appendix

Definitions of Technical Terms

Glossary of technical terms and acronyms used in the manual.

HFC-134a Temperature / Pressure Chart

Table of HFC-134a refrigerant saturation temperatures and pressures.