OMM TGZ-1 TGZ 040A through TGZ 190A 23
MicroTech II Controller
TGZ Controller Software Version
This manual is based on software version WGZDU0102E. The “02E” is the version
descriptor. 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 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 (setpoints)
3) Alarms.
Security protection prevents unauthorized changing of the setpoints 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 is 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 hot water
temperature in the Heating Mode or leaving evaporator water temperature in the Cooling
Mode, number of starts and number of run-hours. See Sequence of Operation on page 20.
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.
To Next Page
Loading...
Need help?
General