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41
EconoMi$er
R
X (Factory--Installed Option)
EconoMi$er X is an economizer system which is available
for 48LC 14--26 units.
The factory--installed option consists of:
S
Either a Low leak or a Standard leak economizer
damper assembly
S
Direct--drive damper actuator with local equipment bus
communications
S
W7220 economizer controller with keypad and display
S
Supply Air Temperature sensor (20K ohm)
S
Outdoor changeover condition sensor (either 20K ohm
dry--bulb or enthalpy sensor)
Unit Installation —
All damper hardware and standard economizer control
components except the enthalpy sensor are factory--mounted
in their operating location. Complete the unit installation by
relocating the enthalpy sensor (when provided; see below),
then assembling and mounting the unit’s outside air hood.
Refer to the base unit’s installation instruction manual for
directions on locating the hood parts package and
assembling the hood with filters.
Enthalpy Sensor Relocation —
See Fig. 54 for view of the enthalpy sensor. Locate the
enthalpy sensor on the side of the economizer housing;
remove mounting screws and save screws. Confirm the DIP
switches are set at OFF, OFF, OFF (see Table 16). Move the
enthalpy sensor to the front face of the economizer housing
and mount per label.
W7220 Economizer Controller
The economizer controller used on electro mechanical units
is the Honeywell W7220.
The W7220 provides typical economizer functions,
including:
S
Management of outside air damper for base unit
Occupied (damper open and modulating) and unit OFF
or Unoccupied status (damper closed)
S
Free--cooling using all outside air when outdoor
conditions permit Integrated cooling operation using
outside air and mechanical cooling when required
S
Demand Controlled Ventilation (DCV) for modulating
ventilation airflow according to space CO
2
level
(requires factory--option or field--installed CO
2
sensor)
The W7220 control also includes a new capability that will
adjust the damper control points during DCV or minimum
ventilation operation as the indoor fan speed is changed.
This control function ensures that required space ventilation
airflow quantities are maintained during reduced fan speed
operation.
Additional control capabilities include automatic detection of
new sensors and detection of sensor failure or loss of
communication.
The W7220 control module includes an integral user
interface with keypad and LCD display that permits direct
input of setpoint values and configurations and display of
status and alarms.
The W7220 controller is located in the RTU base unit’s
Control Box. See the Installation Instructions for this base
unit for the location of the Control Box access panel.
User Interface —
The user interface consists of a 2--line LCD display and a
4--button keypad on the front of the economizer controller.
2 LINE
LCD
MENU UP
(EXIT)
BUTTON
SCROLL
UP/DOWN
BUTTONS
SELECT
(ENTER)
BUTTON
C14206
Fig. 46 -- W7220 Controller
Keypad
The four navigation buttons (see Fig. 46) are used to scroll
through the menus and menu items, select menu items,
and to change parameter and configuration settings.
Using the Keypad with Menus
To use the keypad when working with menus:
S
Press the
(Up arrow) button to move to the previous
menu.
S
Press the
(Down arrow) button to move to the next
menu.
S
Press the
(Enter) button to display the first item in
the currently displayed menu.
S
Press the
(Menu Up/Exit) button to exit a menu’s
item and return to the list of menus.
The Menus in display order are:
S
STATUS
S
SETPOINTS
S
SYSTEM SETUP
S
ADVANCED SETUP
S
CHECKOUT
S
ALARMS
Summary of Contents for WeatherExpert 48LC
Page 5: ...5 C13057 Fig 2 Unit Dimensional Drawing 14 Size Unit Sheet 1 of 3 ...
Page 6: ...6 C13058 Fig 2 cont Unit Dimensional Drawing 14 Size Unit Sheet 2 of 3 ...
Page 7: ...7 C13059 Fig 2 cont Unit Dimensional Drawing 14 Size Unit Sheet 3 of 3 ...
Page 8: ...8 C13032 Fig 3 Unit Dimensional Drawing 17 and 20 Size Units Sheet 1 of 3 ...
Page 9: ...9 C13033 Fig 3 cont Unit Dimensional Drawing 17 and 20 Size Units Sheet 2 of 3 ...
Page 10: ...10 C13034 Fig 3 cont Unit Dimensional Drawing 17 and 20 Size Units Sheet 3 of 3 ...
Page 11: ...11 C14106 Fig 4 Unit Dimensional Drawing 24 and 26 Size Units Sheet 1 of 3 ...
Page 12: ...12 C14107 Fig 4 cont Unit Dimensional Drawing 24 and 26 Size Units Sheet 2 of 3 ...
Page 13: ...13 C14108 Fig 4 cont Unit Dimensional Drawing 24 and 26 Size Units Sheet 3 of 3 ...
Page 17: ...17 C13054 Fig 8 Roof Curb Details 14 Size Unit ...
Page 18: ...18 C13055 Fig 9 Roof Curb Details 17 and 20 Size Units ...
Page 19: ...19 C13056 Fig 10 Roof Curb Details 24 and 26 Size Units ...
Page 27: ...27 a48 9336 Fig 26 48LC 14 26 Electro mechanical Control Wiring Diagram ...
Page 28: ...28 a48 9337 Fig 27 48LC 14 26 RTU Open Control Wiring Diagram ...
Page 29: ...29 a48 9338 Fig 28 48LC 14 26 SystemVut Control Wiring Diagram ...
Page 31: ...31 a48 9339 Fig 30 Typical Power Wiring Diagram SystemVut Controls 48LC 26 208 230V Shown ...
Page 58: ...58 a48 9340 Fig 55 Typical EconoMi erR X Wiring Diagram ...