I N F O R M A T I O N; Option - McQuay MicroTech Unit Controller Installation And Maintenance Data

THE KEYPAD
The keypad consists of 24 touch sensitive membrane key swit-
ches that provide a total of over 160 separate statements regar-
ding the operation, setpoints, and service history of the con-
trolled chiller.
To provide the abundance of information from so few
keypads, many of the keys must be pressed more than once.
Display section keys,
When pressed,
single statement. The next press of the same key displays
the next statement in that scroll. Subsequent keystrokes of
that same key will complete the presentation of the functions
assigned to that key, and will begin again if the key is re-
pressed following completion of the series.
As an example, if the "Water Temps" keypad is pressed;
once: the statement appears "LEAVING EVAP =Xx.X" F"
twice: the statement appears "ENTERING EVAP = Xx.X" F"
three: the statement appears "ENTERING COND = XX.X"F"
four: the statement appears "LEAVING COND = XX.X"F"
five: repeats No. 1 "ENTERING EVAP=XX.X"F"
etc.
For simplicity a table is provided listing the number of
keystrokes required for each key to display it's allocated in-
formation, and the information statement. The keys do not
scroll backward. If review of a preceding statement is desired,
the Cancel, Clear Display keypad, or any other, may be press-
ed, then the original keypad re-pressed. The lead, or first-
press statement will appear. It's also possible to scroll on
through with sequential keystrokes, to complete the cycle and
begin again.
Under the Display section, two keypads operate just slightly
different from the rest. Pressing "Unit Status" once will pro-
duce any one of eighteen (18) different statements. Those
statements depend on the present mode of the unit and are
tabulated below:
First press - "Unit Status" - Statements.
OFF Mode (See Operational Status)
Off: Waiting for system load
Off: Due to Fault
Start-up Sequence
Will start in XX minutes
Waiting: Low Sump Temp.
Evap. Pump is On XX (seconds)
Waiting for Load XX (seconds)
Oil Pump is On XX (seconds)
Cond. Pump is On XX (seconds)
MCR is On XX (seconds)
Unit is running ok
Shutdown Sequence
Stop Unloading XX sec.
MCR OFF Post Lube
Operational Status
Waiting, High Amps
OFF, Load Recycle
OFF, Time Schedule
OFF, Remote Signal
OFF, Manual Switch
OFF, Ready to Start
Pressing the "Unit Status" keypad a second, third, fourth,
etc., through eight strokes will reveal whether or not any or
all of seven (7) options have been activated. See the Table
of Keystrokes Displays for information of the options available.
See the description under the Service, "Set Up Options"
keypad for information on how to activate options.
for example, display a
The second different keypad under the Display section is
the "Data Scroll" key. Following a single press of this key,
a complete list of all of the functional values available in the
Display section and other data will be displayed, each for an
interval of four (4) seconds. This scroll will begin with "Unit
is Running OK", and end following 52 intermediate statements
with a repetition of the same "Unit is Running OK". The in-
termediate statements are tabulated in a form to permit ser-
vice personnel to record the data. These statements include
temperatures, pressures, amps, options, setpoints, operating
hours, and faults (if any).
The Setpoints Section does not contain protective settings,
but does contain the leaving Chilled Water Setpoint
Temperature, Reset Options, % of Amp Limits, Soft Load,
Time and Holiday Schedules, and the means to change those
changeable values impressed in the Microprocessor memory.
See the keypad Table for a listing of the information displayed
with each Setpoints key press.
The following paragraphs describe specific functions and
their operation.
To change a Setpoint (or input an option)
1. Press the setpoint or setup option keypad.
2. With the setpoint or option statement displayed, press
the "+/Yes" or " -/No" key.
3. The display will than read "Enter Password", if it has not
previously been entered and remains active.
4. Enter the operator or service password, as required. See
Table 2.
The Operator Password is 4 consecutive keystrokes of
"?/Help".
5. The display will read "Operator (or Service) Password
OK':
Repress the keypad representing the function to be
6.
changed.
7. With the statement or value displayed, press "Yes" or
"No"; " + ,, or " - " to activate or de-activate an option;
increase or decrease a numerical value. For large
changes in numerical values, hold down the "+/Yes" or
"-/No" key until the desired value is reached.
8. The statement or numerical value will be blinking in-
dicating that a change in setpoint has been requested.
9. To input the new value into the Microprocessor memory,
press "=/Enter". The display will stop blinking.
If after reconsideration, the new statement of value is not
10.
wanted, do not press " =/Enter", but instead press
"Cancel, Clear display". The original value will remain
in the microprocessor memory.
PASSWORD INFORMATION
Once a password has been entered, it remains active for an
interval of ten minutes from the time of its use. For example
if a password is entered and used eleven minutes previous-
ly, it will have disappeared from the system. If, on the other
hand, it was used nine (9) minutes ago, another setpoint may
be changed without again re-entering the password. In addi-
tion, following this latest setpoint change, the password in-
terval is extended for another ten minutes.
To withdraw the "password OK" status press "Cancel, clear
display". Doing so will cause the password approval to ex-
pire in one minute.
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