Microtech Ii Controller - Daikin WGZ030DW Installation, Operation And Maintenance Manual

MicroTech II Controller

Controller Software Version
The version installed in a unit can be viewed by pressing the
MENU and ENTER keys simultaneously, then pressing MENU
to return to the regular menu screen.
General Description
The MicroTech II controller's state-of-the-art design will not only
permit the chiller to run more efficiently but will also simplify
troubleshooting if a system failure occurs. Every MicroTech II
controller is programmed and tested prior to shipment to assist
in a trouble-free start-up.
Operator Friendly
The MicroTech II controller menu structure is separated into
three distinct categories, which provide the operator or service
technician with a full description of
1. Current unit status,
2. Control parameters (set points)
3. Alarms. Security protection prevents unauthorized
changing of the set points and control parameters.
The MicroTech II controller continuously performs self-
diagnostic checks, monitoring all system temperatures,
pressures and protection devices, and will automatically
shutdown a compressor, a refrigerant circuit or the entire unit
should a fault occur. The cause of the shutdown and date
stamp are retained in memory and can be easily displayed in
plain English for operator review, which is an extremely useful
feature for troubleshooting. In addition to displaying alarm
diagnostics, the MicroTech II chiller controller also provides the
operator with a warning of pre-alarm conditions.
Staging
The four scroll (or six) compressors are staged on and off as a
function of leaving chilled water temperature, number of starts
and run-hours. See Sequence of Operation.
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Equipment Protection
The unit is protected by alarms that shut it down and require
manual reset, and also by limit alarms that limit unit operation
in response to some out-of-limit condition. Shut down alarms
activate an alarm signal that can be wired to a remote device.
Unit Enable Selection
Enables unit operation from local keypad or digital input
Unit Mode Selection
Selects standard cooling, ice, glycol, or test operation mode.
Keypad/Display
A 4-line by 20-character/line liquid crystal display and 6-key
keypad is mounted on the unit controller. Its layout is shown
below.
Figure 20: Keypad and Display in MENU Mode
The four arrow keys (UP, DOWN, LEFT, RIGHT) have three
modes of use. Scroll between data screens as indicated by
the arrows (default mode). Select a specific data screen in a
hierarchical fashion using dynamic labels on the right side of
the display (this mode is entered by pressing the MENU key).
Change field values in edit mode according to the following
table:
LEFT Default
RIGHT Cancel
UP Increment
DOWN Decrement
These four edit functions are indicated by one-character
abbreviation on the right side of the display (this mode is
entered by pressing the ENTER key).
29 IOM 1322-1 • WATER-COOLED SCROLL COMPRESSOR
Unit Configuration