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Pressing and releasing the LAST ERROR button on the UCB
can check the alarm history. The UCB will cycle through the last
five (5) alarms, in reverse order, separating each alarm flash
code by approximately 2 seconds. In all cases, a flashing Green
LED will be used to indicate non-alarm condition.
In some cases, it may be necessary to "zero" the ASCD for the
compressors in order to perform troubleshooting. To reset all
ASCDs for one cycle, press and release the UCB TEST/
RESET button once.
Flash codes that do and do not represent alarms are listed in
Table 9.
Unit Control Board Option Setup
Option Byte Setup
• Enter The Option Setup Mode By Pushing The Option
Setup / Store Button, And Holding It For At Least 2
Seconds.
• The Green Status Led (Option Byte) Will Be Turned On
And The Red Status Led (Heat Delay) Is Turned Off.
• The 4 Led Will Then Show The Status Of The Labeled
Option Low Ambient Lockout.
• Press The Up Or Down Button To Change The Led Status
To Correspond To The Desired Option Setup.
• To Save The Current Displayed Value, Push The Option
Setup / Store Button And Hold It For At Least 2 Seconds.
When The Value Is Saved, The Green Led Will Flash A
Few Times And Then Normal Display Will Resume.
NOTE: While in either Setup mode, if no buttons are pushed for
60 seconds, the display will revert to its normal display,
exiting the Option Setup mode. When saving, the
control board only saves the parameters for the
currently displayed mode (Option Byte or Heat
Delay). (Heat Delay not applicable on these units.)
Normal Maintenance
Prior to any of the following maintenance procedures,
shut off all power to the unit, to avoid personal injury.
Johnson Controls Unitary Products
Periodic maintenance consists of changing or cleaning filters
and general cleaning of the outdoor coil.
MOTORS - Outdoor fan motors are permanently lubricated and
require no maintenance.
OUTDOOR COIL - Dirt should not be allowed to accumulate on
the outdoor coil surface or other parts in the air circuit. Cleaning
should be as often as necessary to keep the coil clean. Use a
brush, or other suitable means. Be sure to disconnect power to
the unit prior to cleaning.
Exercise care when cleaning the coil so that the coil fins
are not damaged.
Do not permit the hot condenser air discharge to be
obstructed by overhanging structures or shrubs.
Troubleshooting
Troubleshooting of components necessarily requires
opening the electrical control box with the power
connected to the unit. Use extreme care when working
with live circuit! Check the unit nameplate for the correct
range before making any connections with line
terminals.
The wire number or color and terminal designations
referred to may vary. Check the wiring label inside the
control box access panel for the correct wiring.
579884-BIM-A-0710
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