362242-YIM-B-0109
Johnson Controls Unitary Products 47
FAN ON AND OFF DELAYS
The fan on and off delays can be field adjusted by
pressing a combination of buttons on the UCB.
• 46
• Electric Heat - Press and release the COMM
SETUP
and LAST ERROR buttons at the same
time. The control flashes twice on the LED as
the control writes a 0 second ON and a 30
second OFF fan delay to the control’s pro-
gram memory.
MAINTENANCE
NORMAL MAINTENANCE
FILTERS
Inspect once a month. Replace disposable or clean per-
manent type as necessary. DO NOT replace permanent
type with disposable. The dimensional size of the replace-
ment filter must be the same as the replaced filter.
MOTORS
Outdoor fan motors
are permanently lubricated and
require no maintenance.
Indoor Blower Motor and Drive
- The indoor blower
motor features ball bearings that do not require
periodic lubrication.
On an annual basis, check the motor for accumulations
of dust, etc. that may block the cooling slots in the
motor shell. Check for loose, damaged or misaligned
drive components. Check that all mounting bolts are
tight. Replace defective parts as required.
OUTDOOR COIL
Dirt should not be allowed to accumulate on the out-
door coil surface or other parts in the air circuit. Clean-
ing should be as often as necessary to keep coil clean.
Use a brush, vacuum cleaner attachment, or other suit-
able means. If water is used to clean coil, be sure elec-
tric power to the unit is shut off prior to cleaning.
NOTE: Exercise care when cleaning the coil so that
the coil fins are not damaged.
TABLE 31: UNIT CONTROL BOARD FLASH CODES
Flash Code Description
On Steady
Control Failure - Replace Control
Heart Beat
Normal Operation
1 Flash
Not Applicable
2 Flashes
Control waiting ASCD
1
1. These flash codes do not represent alarms.
3 Flashes
HPS1 - Compressor Lock out
5 Flashes
LPS1 - Compressor Lock out
7 Flashes
FS1 - Compressor Lock out
9 Flashes
Ignition Control Locked Out/
Ignition Control Failure / Limit Switch Trip / No
Jumper Plug in Heat Section
10 Flashes
Compressors Locked Out On Low
Outdoor Air Temperature
1
11 Flashes
Compressors Locked Out Because The
Economizer Is Using Free Cooling
1
13 Flashes
Compressor Held Off Due To Low Voltage
1
14 Flashes
EEPROM Storage Failure (Control Failure)
OFF
No Power or Control Failure
Prior to any of the following maintenance pro-
cedures, shut off all electric power to the unit to
prevent personal injury.
Perform all maintenance operations on the
blower motor with electric power disconnected
from the unit.
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