Temperature - McQuay MicroTech II Operation Manual

.
Table 3: Airflow Menus
Menu Name
Airflow Summary
a
Bldg Pressure
a. The items in this menu apply to units configured for direct building pressure control of return air fan inlet vanes or VFD or units equipped with an energy recovery wheel
option.

Temperature

Menus in the Temperature category contain status and con-
trol set point parameters that define the temperature control
setup of the unit. Table 4 on page 22 lists all menus and
items in the Temperature group or category. The "Range"
column in the table lists all possible values for each item.
The factory settings for the adjustable parameters are shown
in the "Factory Default Value" column. The following are
brief descriptions of the Temperature category menus and
items.
Zone Cooling
The Zone Cooling menu primarily contains basic status and
control parameters that relate to or affect the unit changeover
into cooling operation and control of the space or zone tem-
perature while in cooling operation. For detailed information
regarding unit heating/cooling changeover, refer to
"Heat/Cool Changeover" on page 65.
Control Temp. Control Temp= is a status only item which
displays the current value of the "Control Temperature." The
"Control Temperature" is defined as the temperature input
selected by the CtrlTemp Src= parameter in the Zone Cool-
ing or Zone Heating menu. For example, if the CtrlTemp
Src= parameter is set to "Return", then the Control Temp=
parameter reads the same value as the Return Air= parame-
ter. For more information regarding this parameter, refer
to"Heat/Cool Changeover" on page 65.
Clg Capacity. Clg Capacity= is a status only item which
indicates the percentage of the unit maximum cooling capac-
ity currently operating.
Eff Clg Spt. Eff Clg Spt= is a status only item which indi-
cates the cooling changeover or zone cooling control set
point currently in effect. When the current value of the Con-
OM 138
Menu Item Name Factory Default Value
Flow Status
Disch Fan
RF/EF Fan
Fan Operation
Bldg Press
BldgSP Spt
BSP Db
RF/EF Fan Cap
Field Number
-
-
-
-
-
0.050 "WC
0.010 "WC
-
trol Temp= parameter rises above this parameter by more
than half the Clg Deadband= parameter, cooling capacity is
increased. When the current value of the Control Temp=
parameter drops below this parameter by more than half the
Clg Deadband= parameter cooling capacity is decreased.
This parameter is either set by the controller to same value as
the Occ Clg Spt= parameter or based on a signal from an
optional space temperature sensor with set point adjustment
capability. For details regarding the use of thermostat sup-
plied set points, refer to "Tstat Source Set Points" on
page 66.
Occ Clg Spt. Occ Clg Spt= is an adjustable item used by
the controller to set the Eff Clg Spt= parameter. The Eff Clg
Spt= is set to this value when it is not being set based on a
signal from an optional space temperature sensor with set
point adjustment capability. For details regarding the use of
thermostat supplied set points, refer to "Tstat Source Set
Points" on page 66.
Clg Deadband. Clg Deadband= is an adjustable item
which sets a dead band around the Eff Clg Spt= parameter.
For example, if the Eff Clg Spt= parameter is set to 75ºF and
the Clg Deadband= parameter is set to 2ºF the dead band
around the set point would be from 76.0ºF to 74.0ºF.
CtrlTemp Src. CtrlTemp Src= is an adjustable item which
selects the temperature sensor input to be used for the unit
heating/cooling changeover or zone cooling and heating
capacity change decisions. For example, if the CtrlTemp
Src= parameter is set to "Return", then the Control Temp=
parameter reads the same value as the Return Air= parame-
ter. For detailed information regarding this parameter, refer
to "Heat/Cool Changeover" on page 65.
Space Temp. Space Temp= is a status only item which dis-
plays the current space (or zone) temperature reading from
Range
Flow
-
NoFlow
On
-
Off
On
-
Off
On
-
Off
- -0.250 - 0.250 "WC
1 -0.250 - 0.250 "WC
1 0.001-0.100 "WC
- 0 - 100%
17