Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480350-01
Printed in U.S.A.
Form IIK-CRPWREXH068-05
Pg 8
6-22
Replaces: IIK-CRPWREX068-04
© 2022 Carrier
5. Turn the minimum position potentiometer (MIN POS) on the
Economizer IV controller clockwise to open until the exhaust
LED (EXH) lights up. (See Fig. 13.)
6. Dry contacts on the Economizer IV controller should close
and energize the Power Exhaust Relay (PER). The power
exhaust should turn on.
7. If the power exhaust fan does not turn on, de-energize main
power to the unit and then check the power exhaust installa
-
tion wiring.
8. Set the unit back to its original configuration by turning
the minimum position potentiometer (MIN POS)
counter
-
clockwise, back to the marked setting and remove
the jumpers placed in Steps 2 and 3 of this procedure.
NOTE: For units with DDC control see Service and Maintenance
Manual for power exhaust functional check instructions.
For Units with W7220 Economizer
The economizer controller used on electro mechanical units is a
Honeywell W7220 which is to be located in the RTU base unit’s
control box. See the Installation Instruction for your base unit for
the location of the control box access panel.
NOTE: W7220 control is able to run the check-up routine for
economizer/exhaust directly. This routine can be accessed and ran
using the keypad and navigating through menus.
The W7220 controller provides the following:
• 2-line LCD interface screen for setup, configuration and
troubleshooting
• On-board fault detection and diagnostics
• Sensor failure loss of communications identification
• Automatic sensor detection
• Capabilities for use with multiple-speed indoor fan
systems
USER INTERFACE
The user interface consists of a LCD display and a 4-button
keypad on the front of the economizer controller.
KEYPAD
The four navigation buttons (see Fig. 15) are used to scroll
through the menus/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:
• Press the ▲
Up (arrow) button to move to the previous
menu.
• Press the ▼ (Down arrow) button to move to the next
menu.
• Press the
(Enter) button to display the first item in the
currently displayed menu.
• Press the
(Menu Up/Exit) button to exit a menu’s item
and return to the list of menus.
MENU STRUCTURE
The Menus in display order are:
• STATUS
• SETPOINTS
• SYSTEM SETUP
• ADVANCED SETUP
• CHECKOUT
• ALARMS
Fig. 15 — W7220 Controller
CHECKOUT TEST
NOTE: See User Interface for information about menu navigation
and use of the keypad.
To perform a Checkout test:
1. Scroll to DAMPER OPEN in the Checkout menu using the
▲ and ▼ buttons.
2. Press the
button to select the item.
3. RUN appears.
4. Press the
button to start the test.
5. The unit pauses and then displays IN PROGRESS.
6. Exhaust fan contacts enable during the DAMPER OPEN test.
Make sure you pause in the mode to allow exhaust contacts to
energize due the delay in the system.
7. When the test is complete, DONE appears.
8. When all desired parameters have been tested, press
the
(Menu up) button to end the test.
NOTE: Checkout test can be performed at any time during the op
-
eration of the system as a test that the system is operable.
START-UP
Refer to the base unit’s Service and Maintenance Manual for de
-
tailed Start-up instructions.
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Be sure to allow enough time for compressor startup and
shutdown between checkout tests so that you do not short-
cycle the compressors.
2 LINE
LCD
MENU UP
(EXIT)
BUTTON
SCROLL
UP/DOWN
BUTTONS
SELECT
(ENTER)
BUTTON
