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24. The ComfortLink™ control can now be configured to op-
erate the economizer. To do this the unit must be config-
ured for Economizer Equipped (default is NO). The de-
fault settings are: Minimum Outdoor Air Percentage set-
ting (default is 30%), Economizer High Temperature
Lockout (default is 65 F), Economizer Low Temperature
Lockout (default is 0° F), and Free Cooling Enable (de-
fault is ENABLED). These configurations are accom-
plished through the Scrolling Marquee Display by using
the Configuration menu.
25. To configure the control to use the economizer a pass-
word may be required to edit the configurations, depend-
ing on the previous settings configured in the unit. De-
fault password is "1111".
26. To access the configuration, use the arrow keys to scroll
the red LED on the display to the "Configuration" posi-
tion and press
ENTER
down until the display shows "ECON", and press the
key. At the Economizer Equipped (EC.EQ) set-
ENTER
ting, press
twice. Use the arrow keys to change
ENTER
the configuration to "YES" and press
. Use the arrow keys to scroll down to the Min-
ESCAPE
imum Position setting (MIN.P) and press
Use the arrow keys to increase or decrease the minimum
economizer position percentage and press
then
. Use the arrow keys to scroll down to the
ESCAPE
CB
— Circuit Breaker
ECB
— Economizer Control Board
FIOP — Factory-Installed Option
IAQ
— Indoor-Air Quality
MBB — Main Base Board
OAQ — Outdoor-Air Quality
TB
— Terminal Block
TRAN — Transformer
. Use the arrow keys to scroll
ENTER
and then
twice.
ENTER
and
ENTER
LEGEND
Fig. 12 — Economizer Wiring Diagram
Economizer High Temperature Lockout setting (ECL.H)
and press
ENTER
or decrease the economizer lockout temperature and press
and then
ENTER
scroll down to the Economizer Low Temperature Lock-
out setting (ECL.L) and press
row keys to increase or decrease the economizer lockout
temperature and press
the arrow keys to scroll down to the Free Cooling Enable
setting (FC.EN) and press
keys to toggle between ENABLED and DISABLED and
press
and then
ENTER
27. Configuration of the economizer is now complete. Press-
ing the
ESCAPE
play to the auto scroll setting.
28. Consult the Controls and Troubleshooting Guide for
complete instructions on using the 48/50HG control
system.
29. Install the three mist eliminating filters supplied into the
outdoor air inlet hood.
30. Inspect the unit to make sure all panels are properly re-
placed and secured to the unit.
31. The unit is now ready for normal operation using the
economizer.
6
twice. Use the arrow keys to increase
. Use the arrow keys to
ESCAPE
twice. Use the ar-
ENTER
ENTER
and then
ESCAPE
twice. Use the arrow
ENTER
.
ESCAPE
key several times will return the dis-
. Use
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