McQuay IM 987
103
Final Control Settings
Final Control Settings
When all start-up procedures are completed, set the controls
and program the MicroTech III controller for normal
operation. Use the following list as a guide; some items may
not apply to your unit. For more detail, see IM 919 and OM
920.
1
Turn system switch S1 to ON and S7 to AUTO.
2
Turn gas furnace switch S3 to AUTO or turn electric heat
switch HS1 to ON.
3
Set the electromechanical (Honeywell H205) enthalpy
control (OAE) as required (A, B, C, or D). Set the
solid-state (Honeywell H705/C7400) enthalpy control
(OAE/ RAE) past D.
4
Set the heating and cooling parameters as required for
normal unit operation:
a
Temperature \ Zone Cooling \
b
Temperature \ Zone Heating \
c
Temperature \ Discharge Cooling \
d
Temperature \ Discharge Heating \
5
Set the high ambient heat lockout temperature setpoint,
Temperature \ Zone Heating \ OAT Htg Lock=
as
required.
6
Set the alarm limits as required in
Setup/Service \ Alarm Limits \
.
7
Set the duct static pressure control parameters as
required in keypad menu
Airflow \ Duct Pressure \
.
8
Set the building static pressure control parameters as
required in keypad menu
Airflow \ Bldg Pressure \
.
9
Set the fan tracking parameters as required in keypad
menus
Setup/Service \ Fan Tracking Setup \
and
Setup/
Service \ Fan Balance \
.
10
Set the economizer control parameters as required in
keypad menu
Temperature \ OA Damper \.
11
Set the control timers as required in keypad menu
Setup/Service \ Timer Settings \.
12
Set the date and time in keypad menu
Setup/Service \ Time/Date \.
13
Set the operating schedule as required using keypad
menus.
Note:
When used with a Building Automation
System, these settings may need to be kept at the default
of no schedule:
a
Schedules \ Daily Schedule \
b
Schedules \ Holiday Schedule \
14
Temporarily disconnect static pressure sensor tubing
from sensors SPS1 and SPS2 (if installed) and place the
unit into the calibrate mode by using the keypad menu
Setup/Service \ Unit Configuration \ Calibrate Mode=
and changing the value from NO to YES. The calibrate
mode automatically zeroes all static pressure sensors and
calibrates any actuator feedback pots connected to the
MicroTech III controller. When the calibration is
finished, the keypad menu
System Summary \ System \
Unit Status
= changes from
Calib
to
Off Man
.
15
To restart the unit, reconnect static pressure tubing and
change keypad menu
System Summary \ System \ Ctrl
Mode=
from OFF to AUTO.
Maintaining Control Parameter Records
McQuay recommends that the MicroTech III controller’s
setpoints and parameters be recorded and saved for future
reference. If the Microprocessor Control Board requires
replacement, this record facilitates entering the unit’s proper
data. The following tables display all the setpoints, monitoring
points, and program variables offered by MicroTech III plus
the keypad road map used to find each parameter.
A number of menus and menu items that appear on the unit
keypad/display are conditional and may not apply to a specific
unit, depending on the unit software configuration. The unit
software configuration is defined by a “Software
Configuration Code” shown on a label located near the
keypad/display. The Software Configuration Code also can be
displayed via the six menu items in the Config Code menu on
the unit keypad/display. Refer to OM 920.
The shaded menus and menu items in
Figure 117, page 104
are
conditional. A conditional menu or menu item includes a
reference in
Figure 117
to the position in the Software
Configuration Code upon which its applicability depends. For
example, the Duct Pressure menu in
Figure 117
includes a
notation [14=1 or 2]. This notation means that the Duct
Pressure menu (and all its menu items) applies to the specific
unit only if position 14 in its Software Configuration Code is a
1 or a 2. Otherwise, the menu or menu item is not applicable to
the unit and does not affect its operation.
The items in
Figure 117
include the factory-set value for all
adjustable items.
Keep a record of any changes made to any
of these items.
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