Installation and Maintenance Manual IM 788-0
RoofPak™ MicroTech II™
Remote User Interface
Group: Aftermarket Products
Part Number: 300040363
Date: December 2003
© 2003 McQuay International
Table of Contents
IInstallation of Remote Keypad Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation of Remote Keypad Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
To engage/disengage the remote keypad panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Using the Keypad/Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Display Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Password Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Password Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Clear Alarm Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Keypad Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Left Arrow Key: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Right Arrow Key: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Up Arrow (+) Key: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Down Arrow (-) Key: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Back/Cancel Key: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Enter/Save Key: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Alarm Key: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Clear Alarm Key: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Keypad/Display Exercises . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Changing Set Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Clearing Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Modifying Schedules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2 IM 788
NOTICE
This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with this instruction manual, can cause interference to radio communications. It has been tested
and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC rules. These
limits are designed to provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. Operation of this equipment in a residential area is likely to cause
harmful interference; in which case the user is required to correct the interference at his own expense.
McQuay International disclaims any liability resulting from any interference or for the correction
thereof.
WARNING
Electric shock hazard. Can cause personal injury or equipment damage.
This equipment must be properly grounded. Connections and service to the MicroTech II control panel must
be performed only by personnel that are knowledgeable in the operation of the equipment being controlled.
WARNING
Excessive moisture in the control panel can cause hazardous working conditions and improper
equipment operation.
When servicing this equipment during rainy weather, the electrical components in the main control panel
must be protected from the rain.
CAUTION
Static-sensitive components. A static discharge while handling electronic circuit boards can damage
the components.
Discharge static electrical charge by touching the bare metal inside the main control panel before performing
service work. Never unplug any cables, circuit board terminal blocks, relay modules, or power plugs while
power is applied to the panel.
WARNING
To avoid possible unit damage, Compressor pumpdown is required before removing power to the controller.
IM 788 3
Installation of Remote Keypad Interface
WARNING
Disconnect all power sources to unit before installing interface. Exposure to electricity and moving
parts can cause severe personal injury.
1. Mark the remote keypad interface (1120216-01) location on the backside of the main control box keypad
deadfront. (See Figure 1)
2. Drill two clearance holes for #10 screws 7 ¾ inches
apart in the vertical direction. Approximate location of
the bottom hole in the keypad deadfront are as follows:
For 55 inch high units – 3 1/4 inches from the
bottom and 3 1/4 inches from the left edge.
For 72 & 96 inch high units – 3 1/4 inches from the
bottom and 5 3/4 inches from the left edge.
3. Fasten the remote keypad interface assembly to the
deadfront using the two #10 screws and nuts supplied in
a plastic bag in the kit.
4. Disconnect the existing communication cable from the
existing keypad on the deadfront and reconnect it to
Figure 1: Backside of the main control box keypad deadfront
SCHEMATIC
#10 SCREW
REMOTE KEYPAD
INTERFACE ASSY
J1(from MCB) modular jack on the remote keypad
interface assembly.
5. Connect the communication cable that is supplied with
the remote keypad interface assembly between the existing keypad on the deadfront and the J2 (to local keypad)
modular jack.
6. Secure ground wire (green) supplied with remote keypad interface assembly to one of the existing keypad
mounting studs by removing its nut. Placing the ring terminal end of the ground wire over the stud and refasten
with the nut.
7. There are three pressure sensitive schematics supplied,
place one of the schematics on the front side of the deadfront above or beside the keypad. Place another on the
backside of the deadfront wherever space allows.
T
N
O
R
F
D
A
E
D
F
O
E
D
I
S
E
G
N
I
H
#10 NUT
TO MCB
GROUND WIRE
EXISTING
COMMUNICATION
BACK OF EXISTING
KEYPAD
ADDITIONAL
COMMUNICATION
CABLE
4 IM 788
CABLE
Installation of Remote Keypad Panel
1. Install the remote keypad panel (1120217-01) following
local power authority codes.
2. Cable between remote keypad interface and remote keypad panel is to be field supplied. Cable requirements are
specified on the schematic.(Figure 2)
Figure 2: Schematic
To engage/disengage the remote keypad panel.
1. Locate switch SW1 on remote keypad interface on the
backside of the main control box keypad deadfront. (See
Figure 3)
3. Make connections between the remote keypad interface
and the remote keypad panel per the schematic.
2. Depress switch SW1 to engage remote keypad panel.
3. Depress switch SW1 to disengage remote keypad panel.
Figure 3: SW1 Switch location
SW1 Switch
IM 788 5
Using the Keypad/Display
The keypad/display, shown in Figure 4, is provided with all
MicroTech II Applied Rooftop Unit Controllers on these
units. With the keypad/display, operating conditions, system
alarms, control parameters, and schedules can be monitored.
After password entry, set points, parameters, and schedules
can be edited.
Menu Structure
The keypad accessible information in the MicroTech II controller is organized in a menu structure to provide quick
access. As shown in Figure 5 on page 7, this structure contains 1 main menu and a string of 48 sub-menus. Each submenu is made up of one or more menu items. The string of
48 sub-menus is divided into 7 “categories.” The main menu
has seven items within it that “point” or provide a “bookmark” to the first sub-menu within the respective category.
The seven categories in the main menu are “System Summary”, “Airflow”, “Temperature”, Schedules”, “Setup/Service”, “Active Alarms” and “Previous Alarms.” The name of
each category generally describes the basic purpose of the
menus in the particular group. Complete information regarding the contents of each sub-menu is included in MicroTech
II Applied Rooftop Unit Controllers OM 137.
Figure 4: Keypad/display
Discharge Cooling
Disch Air= 55.0°F
Clg Capacity= 50%
Eff Clg Spt= 55°F
6 IM 788
Figure 5: Keypad Accessible Menu Structure
CLEAR
ALARM
Move Display Down
Decrement Adjustable Parameter
ALARM
Move Display Up
Increment Adjustable Parameter
SAVE
ENTER
Move Display Right
Move Edit Cursor Right
Display Active Alarm Clear Active Alarm
Select Menu
Save Edited Parameter
Control Temp= xxx.x°F
Clg Capacity= xxx%
Bldg Pressure Zone Cooling
Bldg Press= x.xx"WC
BldgSP Spt= 0.050"WC
Duct Pressure
Duct Press= x.xx"WC
DuctSP Spt= 1.00"WC
Airflow Summary
Flow Status= _____
Disch Fan= _____
Eff Clg Spt= xxx.x°F
Occ Clg Spt= 75.0°F
Clg Deadband= 2.0°F
CtrlTemp Src= Return
BSP Db= 0.010"WC
RF/EF Fan Cap= xxx%
DSP Db= 0.00"WC
Disch Fan Cap= xxx%
RF/EF Fan Cap= xxx%
RF/EF Fan= _____
Fan Operation= _____
Space Temp= xxx.x°F
UnoccClg Spt= 85.0°F
UnoccClgDiff= 3.0°F
Clg Status= _____
OATComp Lock= 55°F
A
OATLock Diff= 1°F
Discharge Heating
RF/EF Fan Cap= xxx%
EF Min Cap= 5%
Energy Rec= Yes
ER DAT= xxx.x°F
ER ExhT= xxx.x°F
Disch Air= xxx.x°F
Htg Capacity= xxx%
Eff Htg Spt= xxx.x°F
DAT Htg Spt= 100.0°F
Htg Db= 1.0°F
Max Signal= 100%
MinOAResetMax= 100%
Max Fan Diff= 50%
Min Fan Diff= 20%
Reset T Limit= 0°F
Min Htg Spt= 60.0°F
Max Htg Spt= 120.0°F
Htg Reset= None
Min DAT Ctrl= Yes
EconChgovr= Enthalpy
EconChgovrT= 60°F
Min Htg Spt@= 60
EconChgovrDiff= 1°F
Max Purge= 60 min
OA Temp= xxx.x°F
Max Htg Spt@= 20
Temperatures
Control Temp= xxx.x°F
Disch Air= xxx.x°F
Return Air= xxx.x°F
Space Temp= xxx.x°F
OA Temp= xxx.x°F
Keypad Key Definitions
1
Main Menu
System Summary
Move Display Left
Move Edit Cursor Left
2
3
4
Airflow
Schedules
Temperatures
5
Setup/Service
BACK
6
Active Alarms
CANCEL
7
Previous Alarms
Backup To Previous Menu
Cancel Editing Command
1 2 3
Occupancy
Occupancy= _____
System
UnitStatus= _____
Occ Mode= Auto
OccSrc= _____
Bypass Time= 0 min
Emerg Override= Norm
Clg Capacity= xxx%
Htg Capacity= xxx%
Clg Status= _____
Htg Status= _____
Ent Fan= xxx.x°F
Ctrl Mode= Off
Appl Mode= Heat/Cool
VAV Output= _____
OA Damper Energy Recovery
OA Damper Pos= xxx%
Eff Min OA Pos= xxx%
Discharge Cooling
Disch Air= xxx.x°F
Clg Capacity= xxx%
Zone Heating
Control Temp= xxx.x°F
Htg Capacity= xxx%
OA Flow= xxxxxCFM
OA Ambient= _____
MinOA Type= None
DesignFlow= No
Eff Clg Spt= xxx.x°F
DAT Clg Spt= 55.0°F
Clg Db= 1.0°F
Min Clg Spt= 55.0°F
Eff Htg Spt= xxx.x°F
Occ Htg Spt= 70.0°F
Htg Deadband= 2.0°F
CtrlTemp Src= Return
MinOA Pos= 10%
MinOA Flow= 2000CFM
MinOA @Max Sig= 60%
Min Signal= 0%
Max Clg Spt= 65.0°F
Clg Reset= None
Min Clg Spt@= 90
Max Clg Spt@= 70
Space Temp= xxx.x°F
UnoccHtg Spt= 55.0°F
UnoccHtgDiff= 3.0°F
Htg Status= _____
OATHtg Lock= 55°F
OATLock Diff= 1°F
Sub Menus
BACK
CANCEL
IM 788 7
Figure 5: Keypad Accessible Menu Structure (Continued)
Fan Balance
Fan Balance= Off
Set Max w/o Exh= No
2nd P Sensor= None
DF CapCtrl= DuctPres
Remote DF Cap= 25%
RF/EF Ctrl= Tracking
Rem RF/EF Cap= 25%
Unit Configuration
AHU ID= _____
Keypad= _____
Optimal Start
Space Temp= xxx.x°F
Optimal Start= No
Calibrate Mode= No
Space Sensor= Yes
EFT Sensor= No
Auto Update= Yes
Htg Rate= 0.4°F/min
Htg OAT= 35°F
Htg Zero OAT= 0°F
Clg Rate= 0.4°F/min
Clg OAT= 85°F
Eng Units= English
Fan Tracking
DF Max w/oExh= 100%
RF@DFMax w/oEx=95%
Clg Zero OAT= 100°F
Duct Static P Setup
DSP Propbd= 6.0"WC
DSP IntTime= 12 sec
Set Min w/o Exh= No
Set Max w/ Exh= No
Set Min w/ Exh= No
DF Min w/oExh= 20%
RF@DFMin w/oEx=15%
DF Max w/Exh= 100%
DSP Period= 10 sec
Rem RF/EF Cap= 25%
RF@DFMax w/Ex=60%
DF Min w/Exh= 20%
RF@DFMin w/Ex=10%
B
Heating Setup
Stage Time= 5 min
F&BP Ctrl= OpenValve
DesignFlow Setup
Wait Time= 30 sec
Modband= 50%
Economizer Setup
Clg Propbd= 30°F
Clg IntTime= 60 sec
F&BP Chgovr= 37°F
Htg IntTime= 120 sec
Max Step= 5.0%
Deadband= 6.0%
LH Flow= xxx.xx%
Clg Period= 30 sec
Feedback= 3 Wire
Htg Period= 60 sec
RH Flow= xxx.xx%
AI11 Reference= No Feedback= 3 Wire
Hol 11=mmmdd-mmmdd
Hol 12=mmmdd-mmmdd
Hol 13=mmmdd-mmmdd
Hol 14=mmmdd-mmmdd
Hol 15=mmmdd-mmmdd
Hol 16=mmmdd-mmmdd
Holiday Schedule
Hol 1=mmmdd-mmmdd
Hol 2=mmmdd-mmmdd
Hol 3=mmmdd-mmmdd
Hol 4=mmmdd-mmmdd
Hol 5=mmmdd-mmmdd
Hol 6=mmmdd-mmmdd
Hol 7=mmmdd-mmmdd
Hol 8=mmmdd-mmmdd
Hol 9=mmmdd-mmmdd
Hol 10=mmmdd-mmmdd
One Event Schedule
Beg= mmm dd@hh:mm
End= mmm dd@hh:mm
4 5
Daily Schedule
Mon= 00:00 - 00:00
Tue= 00:00 - 00:00
Wed= 00:00 - 00:00
Thu= 00:00 - 00:00
Fri= 00:00 - 00:00
Sat= 00:00 - 00:00
Sun= 00:00 - 00:00
Hol= 00:00 - 00:00
Time/Date
Timer Settings
Operating Hours
Passwords
Time= hh:mm:ss
Day= day
Date= dd-mmm-yyyy
Service= 0 min
Recirculate= 3 min
Low DAT= 3 min
Max MWU= 90 min
Fan= xxxxx hr
Mech Cool= xxxxx hr
Comp 1= xxxxx hr
Comp 2= xxxxx hr
Timeout= 15 min
Clear Alarm= No
Bypass= 120 min
Start Init= 180 sec
Post Heat= 0 min
Min Exh On= 120 sec
Comp 3= xxxxx hr
Comp 4= xxxxx hr
Heating= xxxxx hr
Economizer= xxxxx hr
Min Exh Off= 120 sec
Bypass= xxxxx hr
ERecovery= xxxxx hr
Chilled Water Setup
Clg Propbd= 30°F
Compressor Setup
Lead Circuit= #1
Exhaust Fan Setup
Min Exh Fan Cap= 25%
Bldg Static P Setup
BSP Propbd= 1.0"WC
Clg IntTime= 60 sec
Clg Period= 30 sec
Stage Time= 5 min Htg Propbd= 20°F
Comp Ctrl= Cross Circ
Clg Method= Average
Cond Fan1 Spt= 0°F
Cond Fan2 Spt= 55°F
Cond Fan3 Spt= 65°F
Min OA Dmpr= 5%
Min DF Cap= 10%
Min Strt Time= 120 sec
Min Stop Time= 120 sec Feedback= 3 Wire
BSP IntTime= 10 sec
BSP Period= 5 sec
Cond Fan4 Spt= 75°F
Cond Fan Diff= 5°F
Stage Time= 5 min
A
Sub Menus (Continued)
8 IM 788
Figure 5: Keypad Accessible Menu Structure (Continued)
Alarm Limits
Hi Disch Alm= 170°F
Lo Disch Alm= 40°F
Hi Return Alm= 120°F
OA Dmpr Stuck= Off
Airflow Switch= Off
Dirty Filter= Off
Dirty FnlFltr= Off
Ckt1 H/W= Off
Comp #6 Alm= Slow
Ckt2 H/W= Off
GenC H/W= Off
PumpDown-Ckt1= Slow
PumpDown-Ckt2= Slow
HtgB H/W= Off
Ckt1 Clg Ena= Slow
Ckt2 Clg Ena= Slow
GenC Clg Ena= Slow
HtgB Htg Ena= Slow
Ckt1 Comm Fail= Slow
Ckt2 Comm Fail= Slow
Alarm Out Warnings
Comp #2 Alm= Slow
Comp #3 Alm= Slow
Comp #4 Alm= Slow
Genc Comm Fail= Slow
HtgB Comm Fail= Slow
ERecB Comm Fail= Slow
Previous Alarm 3
Alarm Name
Alarm Type
Previous Alarm 2
Alarm Name
Alarm Type
Previous Alarm 1
Alarm Name
Alarm Type
dd-mmm-yy hh:mm:ss
dd-mmm-yy hh:mm:ss
dd-mmm-yy hh:mm:ss
Previous Alarm 8
Alarm Name
Alarm Type
dd-mmm-yy hh:mm:ss
Alarm Out Problems
Alarm Out Faults
Manual Control
Energy Recovery Setup
B
Freeze= Slow
OAT Sensor= Slow
Space Sensor= Slow
Freeze= Fast
Smoke= Fast
OAT Sensor= Fast
Manual Control= No
Discharge Fan= Off
RF/EF Fan= Off
Min ExhT Diff= 2°F
Max ExhT Diff= 6°F
Stage Time= 5 min
Return Sensor= Slow
Space Sensor= Fast
Fan Operation= Off
Min Off Time= 20 min Comp #5 Alm= Slow
Ent Fan Sens= Slow
Return Sensor= Fast
Alarm= Normal
Lo Airflow= Slow
Disch Sensor= Fast
OA Damper= Auto
Heat Fail= Slow
Duct Hi Limit= Fast
Mod Cooling= Auto
Fan Retry= Slow
Hi Return Temp= Fast
Mod Heating= Auto
Hi Press-Ckt1= Slow
Hi Press-Ckt2= Slow
Lo Press-Ckt1= Slow
Lo Press-Ckt2= Slow
Hi Disch Temp= Fast
Lo Disch Temp= Fast
Fan Fail= Fast
OA Dmpr Stuck= Fast
VAV Output= Heat
Disch Vanes= Auto
RF/EF Vanes= Auto
Disch VFD= Auto
Frost-Ckt1= Slow
Frost-Ckt2= Slow
Comp #1 Alm= Slow
RF/EF VFD= Auto
Active Alarm 4
Active Alarm 3
Active Alarm 2
6 7
Active Alarm 1
Alarm Name
Alarm Type
dd-mmm-yy hh:mm:ss
Alarm Name
Alarm Type
dd-mmm-yy hh:mm:ss
Alarm Name
Alarm Type
dd-mmm-yy hh:mm:ss
Alarm Name
Alarm Type
dd-mmm-yy hh:mm:ss
Previous Alarm 7
Alarm Name
Alarm Type
Previous Alarm 6
Alarm Name
Alarm Type
Previous Alarm 5
Alarm Name
Alarm Type
Previous Alarm 4
Alarm Name
Alarm Type
dd-mmm-yy hh:mm:ss
dd-mmm-yy hh:mm:ss
dd-mmm-yy hh:mm:ss
dd-mmm-yy hh:mm:ss
Sub Menus (Continued)
IM 788 9
Display Format
The information stored in the MicroTech II controller menu
structure can be viewed on the 4-line by 20-character LCD
display. The current menu is displayed on the top line and up
to three menu items are displayed on the next three lines
(refer to Figure 6). The item lines contain one or more data
fields that convey varying information. A blinking cursor
indicates the current item. There is a “navigation” indicator
on the right side of the top line while in navigation mode.
A symbol indicates there are more items in the menu
“above” the current display window. A symbol indicates
there are more items in the menu “below” the current display
window. A symbol indicates there are more items in the
menu “above” and “below” the current display window.
Figure 6: LCD Display Format
Navigation Indicator
Menu Line
Item Line
Item Line
Item Line
Blinking Cusor
Temperatures
Disch Air=55.0°F
Return Air=73.5°F
Space Temp=74.5F
Data Field
word to 4545 and enter the new value, the following procedure is used:
1. Pressing the Down Arrow (-) key one time decrements
the first field (blinking) to a value of 4.
2. Pressing the Right Arrow key one time moves the blinking cursor to the second field.
3. Again pressing the Right Arrow key one time (the second field will not be changed in this example) moves the
blinking cursor to the third field.
4. Pressing the Down Arrow (-) key one time decrements
the third field (now blinking) to a value of 4.
Password Protection
The MicroTech II controller includes password protection to
guard against inadvertent control parameter changes. When
an attempt is made to change the value of an adjustable
parameter with the keypad, the controller prompts the user to
enter either the level 2 (L-2) or level 1 (L-1) password
depending on the level required for that particular parameter.
The L-2 password is 4545. The L-1 password is 6555.
Note: L-2 has a “higher” level of authority than L-1. The
controller prompts for the password by displaying
the following:
Figure 7: Password Protection
**Enter L-2 Password
Password= 5555
Blinking Data Field
The password fields initially has values off 5555 in them.
The first field is blinking. For example, to change the pass-
5. Now the four fields should be 4545, the desired password. Pressing the Enter/Save key enters the password.
If the correct password is entered, the display returns to the
item to be changed and the changeable item field is blinking
waiting to be modified.
Password Timeout
Once the password is entered, the controller allows further
changes without prompting the user to enter a password until
either the password timer expires or a different password
level is required for the particular parameter to be changed.
The password timer is adjustable from 2-60 minutes using
the Timeout= parameter in the Passwords menu.
Clear Alarm Password
Normally clearing an active alarm does not require a password entry. This is true if the Clear Alarm= item in the Pass-
words menu is set to “None.” However, if this parameter is
set to “L-1” the controller prompts the user to enter the level
1 password before an alarm can be cleared. If this parameter
is set to “L-2” the controller prompts the user to enter the
level 2 password before an alarm can be cleared. For details
regarding alarm clearing, refer to “Keypad/Display Exercises” on page 11.
10 IM 788
Keypad Functions
The MicroTech II controller keypad consists of 8 pressure
sensitive membrane switches. Refer to Figure 4 on page 6.
The following are descriptions of these keys and their
functions.
Left Arrow Key:
Pressing this key changes the displayed menu one menu to
the left while navigating within the menu structure. It also
changes the field to be edited one field to the left while editing a parameter value.
Right Arrow Key:
Pressing this key changes the displayed menu one menu to
the right while navigating within the menu structure. It also
changes the field to be edited one field to the right while
editing a parameter value.
Up Arrow (+) Key:
Pressing this key changes the displayed menu or menu item
up one menu or menu item while navigating within the menu
structure. It also increments a changeable parameter one
value while editing.
this key while at the main menu causes a manual password
log off and resets the password timer.
Enter/Save Key:
Pressing this key while viewing a menu on the main menu
changes the displayed menu to the first menu of the menu
group or category associated with that menu. Pressing this
key while viewing a changeable menu item places the keypad into “edit” mode. The first changeable field for that
parameter begins blinking and the top line of the display is
replaced with **Edit Mode, indicating the “edit” mode is
activated. Once a parameter is changed in “edit” mode,
pressing this key “saves” the new parameter value into memory. When the new parameter value is saved, the changeable
field or field stops blinking and the **Edit Mode message
disappears from the top line of the display, indicating the
keypad is no longer in “edit” mode.
Alarm Key:
Pressing this key while the red LED above it on the keypad
is on changes the displayed menu to the Active Alarm 1
menu.
Clear Alarm Key:
Pressing this key while any of the active alarm menus are
being displayed sends a clear command to clear the alarm.
Down Arrow (-) Key:
Pressing this key changes the displayed menu or menu item
down one menu or menu item while navigating within the
menu structure. It also decrements a changeable parameter
one value while editing.
Back/Cancel Key:
Pressing this key while navigating within the menu structure
changes the displayed menu back to the main menu. While
editing a changeable parameter, pressing this key causes the
edit session to be terminated and the parameter value reverts
to the value it had before beginning the editing session.
Pressing this key after having pressed the Alarm key to view
an active alarm causes the display to revert to the menu that
was in the display prior to pressing the Alarm key. Pressing
IM 788 11
Keypad/Display Exercises
The following are three exercises that serve as a guide
through some typical keypad operations. Note that often
there is more than one way to perform an operation.
Changing Set Points
In this exercise, assume that the current cooling discharge air
set point is 55°F and is not quite meeting the system cooling
requirements. Using the following procedure, the cooling
discharge air set point is changed to 53°F.
1. Pressing the Back/Cancel key changes the display back
to the main menu if not already there.
2. Assuming the blinking cursor is positioned on the System Summary menu, pressing the Down Arrow (-) key
twice changes the cursor position to the Temperature
menu.
7. Pressing the Down Arrow (-) key once decrements the
current DAT Clg Spt= value by a tenth of a degree.
Pressing and holding the Down Arrow (-) causes the
value to decrement rapidly.
3. Pressing the Enter/Save key changes the display to the
Zone Cooling menu, the first menu in the Temperatures
group of menus.
4. Pressing the Right Arrow key twice changes the display
to the Discharge Cooling menu. The cursor is positioned
on the first item within this menu which is the Disch
Air= item.
5. Pressing the Down Arrow (-) key three times moves the
display down three items in the menu and positions the
cursor on the DAT Clg Spt= item.
6. When the Enter/Save key is pressed and if the password
timer has expired since the last time the password was
entered, the controller prompts the user to enter a password at this point. The procedure outlined above in
“Password Protection” on page 10 must be followed to
enter the password. Once the password has been successfully entered, the display enters the “edit” mode as
show below.
When the Enter/Save key is pressed and if a password
entry is not required, the display simply enters the “edit”
mode as shown below.
Menu Line
**Edit Mode
Cooling Capacity=25%
Eff Clg Spt=55.0°F
Item Line Being Edited
DAT Clg Spt=55.0F
Blinking Data Field
8. When the DAT Clg Spt= parameter is at the desired
value (53.0°F in this example), pressing the Enter/Save
key stores the new setting and terminates the edit session.
Note: The data field stops blinking when the new value is
recorded and the display leaves the “edit” mode.
Clearing Alarms
In this exercise, assume that a “fault” alarm exists. This type
of alarm shuts down the unit and keeps it off until the alarm
is manually cleared. If the conditions that caused the alarm
have been corrected, the following procedure is used to clear
a fault.
1. Pressing the Alarm key while the red LED on the keypad is blinking (indicating an active alarm condition)
changes the displayed menu to the Active Alarm 1 menu
which displays the current highest priority alarm.
2. Pressing the Clear Alarm key sends a clear command to
the controller. This clears the alarm and returns the unit
to normal operation.
Modifying Schedules
In this exercise, assume that a change in building occupancy
requires the rooftop unit to run from 8:30 a.m. to 5:30 p.m.
on Sunday. The current schedule has the unit shut down on
Sunday. Using the following procedure, this schedule is
changed accordingly. This procedure assumes that the password has previously been entered and the password timer
has not expired.
Note: The time schedule and time clock in the MicroTech
II controller use “military” time. In this case 5:30
p.m. is equivalent to 17:30 in “military” time.
Note: The Menu Line has been replaced by the “**Edit
Mode” indication message, the cursor has disappeared and the date field to be edited is blinking.
1. Pressing the Back/Cancel key changes the display to
back to the main menu if not already there.
12 IM 788
2. Assuming the blinking cursor is positioned on the System Summary menu, pressing the Down Arrow (-) key
three times changes the cursor position to the Schedules
menu.
3. Pressing the Enter/Save key changes the display to the
Daily Schedule menu, the first menu in the Schedules
group of menus.
4. Pressing the Down Arrow (-) key six times moves the
display down six items in the menu and positions the
cursor on the Sun= item.
5. When the Enter/Save key is pressed (and if a password
entry is not required) the display enters the “edit” mode
with the “start hour” data field blinking.
holding the Up Arrow (+) causes the value to increment
rapidly.
9. When the “start minute” is at the desired value (30 in
this example), pressing the Right Arrow key moves the
blinking cursor to the “stop hour” field.
10. Pressing the Up Arrow (+) key once increments the current “stop hour” value by one hour. Pressing and holding
the Up Arrow (+) causes the value to increment rapidly.
11. When the “stop hour” is at the desired value (17 in this
example), pressing the Right Arrow key moves the
blinking cursor to the “stop minute” field.
6. Pressing the Up Arrow (+) key once increments the current “start hour” value by one hour. Pressing and holding the Up Arrow (+) causes the value to increment
rapidly.
7. When the “start hour” is at the desired value (08 in this
example), pressing the Right Arrow key moves the
blinking cursor to the “start minute” field.
8. Pressing the Up Arrow (+) key once increments the current “start minute” value by one minute. Pressing and
12. Pressing the Up Arrow (+) key once increments the current “stop minute” value by one minute. Pressing and
holding the Up Arrow (+) causes the value to increment
rapidly.
13. When the “stop minute” is at the desired value (30 in
this example), pressing the Enter/Save key stores the
new Sun= start/stop setting and terminates the edit session.
Note: The data field stops blinking when the new value is
recorded and the display leaves the “edit” mode.
For MicroTech II operation see unit Installation Manual
(IM 702) and Operation Manual (OM 137).
IM 788 13
This document contains the most current product information as of this printing. For the most up-to-date
product information, please go to www.mcquay.com.
www.mcquay.com • 800-432-1342
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