McQuay MicroTech Unit Controller Installation And Maintenance Data page 23

ed water setpoint. The thermostat will reclose, initiating a com-
pressor stat-l when the chilled water temperature rises to 2" F
above the setpoint.
These values are adjustable as described
section of this manual.
SOFTWARE VERSION NUMBER CODE INFORMATION
The Logic Cartridge on the mother board, the Display EnGinn
on the back of the keypad door, and the logic cartridge
mounted inside the lead-lag/load balance panel (where us-
ed) all contain the software information required to control and
protect the chiller.
For varied reasons, there are different software versions.
On any single compressor chiller, the software version on
the Logic Cartridge and the Display EnGinn must be the
(Software Version Number Code is found on the label attached to the upper right-hand side of the Display EnGinn.)
(Software Version Number is found on the label attached to the upper spine of the Logic Cartridge.)
P =
Centrifugal Chiller
D = Control EnGinn (Logic Cartridge)
LOGIC CARTRIDGE CODE (LEAD-LAG/LOAD
May
Also Be DUALS
Indicates Dual Unit Controller
in the keypad
DISPLAY ENGINN CODE
LOGIC CARTRIDGE CODE (CONTROL ENGINN)
same.
On any dual compressor chiller, the software on both
MicroTech panels Logic Cartridges and Display Enginns, and
the Lead-Lag/Load Balance Logic Cartridge must all be the
same.
On any two chillers on the same installation using a
separate Lead-Lag/Load Balance control, the software pro-
grams on all programmable components must all be the same
version.
In addition, whenever inquiries are being made, or program-
mable components replaced, the Version number must be
furnished to McQuay.
Version number codes for the three (3) basic components,
and their location on the components are shown below.
DUA 08 D
United States Terminology
M = Metric Terminology
2 = Refrigerant R-12
5 = Refrigerant R-500
BALANCE)
Revision (A, B, C, etc.)
Version Number (07, 08, etc.)
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