Unit installation

44 OMRCPMICRO
Item group
The keys in this group are for stepping from item to item within a menu.
Prev.—Pressing "PREV." shifts the display to the previous item in a menu. Note: When the first item in a menu
is currently in the display, pressing "PREV." causing an "end of items" message to appear in the display
pressing "PREV." again causes the display to wrap around to the last item in the menu.
Next—Pressing "NEXT" shifts the display to the next item in a menu. Note: When the last item in a menu is
currently in the display, pressing "NEXT" causes an "end of items" message to appear in the display. Pressing
"NEXT" again causes the display to wrap around to the first item in the menu.
Action group
The keys in this group are for making changes to unit control parameters or for clearing alarm conditions.
Note: Before a change to a parameter can be made or before an alarm can be cleared, the display
prompts the user with an "Enter Password" message. At this point, the password must be entered
before the user can continue with the action.
"Enter" "Enter" "Enter" 'Enter"
Incr—When changing the value of a menu item entry, pressing "INCR. +" shifts the menu item display line to
the next higher or next available selection.
Decr—When changing the value of a menu item entry, pressing "DECR. -" shifts the menu item display line to
the next lower value or previous available selection.
Enter—Once a change has been made to a desired value, pressing "ENTER" locks in the new value.
Clear—Pressing "ALARMS" followed by "CLEAR" clears the current alarm. Also, when a change is made to
a menu item pressing "CLEAR" returns the display to the original value as long as "ENTER" has not been
pressed.
Note: Before clearing alarms, the operating conditions stored in the current alarm screen should be
written down and saved.
Note: The cause of an alarm should always be determined and corrected before resetting the alarm
through the keypad.
Example of Keypad Operation—As an example of using the keypad key functions, consider reprogramming the
Leaving Evaporator Set Point from 44°F to 42°F. This consists of changing the Menu Item 14B (Leaving
Evaporator Set Point) entry from "44°F to 42°F". Assume Menu #1 (Unit Status) is currently in the display.
The following key sequence is followed.
1. Press the "CATEGORY" group "CONTROL" key one time. This switches the display to Menu #13 (the
first menu in the "CONTROL" category).
2. Press the "MENU" group " NEXT" key once. This shifts the display to Menu Item 14A (Active Set
Point).
3. Press the "ITEM" group "NEXT" key once. This shifts the display to Menu Item 14B. (Leaving
Evaporator Set Point).
4. Press the "ACTION" group "DEC -" key one time. This prompts the user to enter the password.
"Enter" "Enter" "Enter" "Enter"
5. After the "Password Verified" message, press the "ACTION" group "DEC -" key four times. This changes
the menu item entry to 42°F.
6. Press the "ACTION" group "ENTER" key one time. This stores the new entry into the MicroTech
controller memory.
7. Pressing the "CATEGORY" group "STATUS" key then shifts the display back to Menu #1.