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McQuay OM 751 9
Getting Started
Using the Keypad/Display
Viewing Actual Indoor Air Temperature (IAT)
Normally, the effective set point temperature appears on the keypad/display. You also can use
the keypad/display to view the indoor air temperature (IAT). See Figure 3.
Note – When the actual indoor air temperature (Effective Space Temp Output) equals the
effective set point temperature (Effective Set Point Output), you there is no change to the
keypad/display when you view space temperature.
Figure 3: Viewing indoor air temperature
Changing Set Points
The keypad/display can be used to make a +/–5°F (+/–3°C) offset adjustment to the effective
temperature set point. See Figure 4. Also see “Space Temperature Set Points” on page 26 to
learn more about temperature set points.
Figure 4: Adjusting the set point offset
Note – The set point offset clears whenever UVC power is cycled. When you change the set point
offset after a power cycle, or for the very first time, this cleared value shows as the highest
allowed value (5°F/3°C) but is not an actual offset value.
– When using the +/–3°F (+/–1.7°C) remote wall sensor, any set point offset adjustment
made at the keypad/display causes the UVC to override and ignore the remote wall
sensor set point adjustment knob. To use the remote wall sensor set point adjustment
knob after you changed the set point offset on the keypad/display, clear the keypad/
display set point offset by cycling UVC power.
– When using the 55°F to 85°F remote wall sensor, the UVC ignores any LUI set point offset
adjustments.
Menu Reference
The keypad/display menu eases troubleshooting and simplifies UVC configuration. The user
can access the most common parameters and system status values without a PC or network
interface.
The keypad/display menu is accessed via an unmarked, hidden key. This hidden key is located
approximately behind the letter “h” in the MicroTech II logo on the keypad/display face.
The keypad/display menu consists of two levels. The first level is the keypad/display Menu
Item List containing alphanumeric characters representing each parameter. The second level is
where the parameter’s value is viewed and adjusted if the parameter is adjustable. After 15-
seconds, an inactivity timer automatically causes the display to back out of the menu levels,
returning to the effective set point display.
FUNC
Enter
(5-sec)
Actual space
temperature
Effective
set point
Effective
set point
70 71 70
So
FUNC
FUNC
Enter
Save
change
70
Effective
set point
0
0
Current
offset
Set point
offset
-1
Adjusted
offset
Flash
value
So 69
Effective
set point
-1