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349215-JIM-B-1008
While in either Setup mode, if no buttons are
NOTE:
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 dis-
played mode (Option Byte or Heat Delay).
TABLE 28: HEAT DELAY
Heat
Heat
Red
Fan On
Fan Off
LED 8
Delay
Delay
60
180
60
90
60
60
60
30
45
180
45
90
45
60
45
30
30
180
30
90
30
60
30
30
0
60
0
30
0
10
Non-std
Non-std
66
Red
Red
LED 4
LED 2
On
On
On
On
On
On
On
On
Off
On
On
Off
On
Off
On
On
Off
On
On
Off
Off
On
Off
Off
Off
On
On
Off
On
On
Off
On
Off
Off
On
Off
Off
Off
On
Off
Off
On
Off
Off
Off
Off
Off
Off
OPTIONAL VAV CONTROL BOARD FLASH CODES
Flash codes are also utilized by the VAV add-on board to aid
in troubleshooting optional VAV applications. Flash codes are
displayed by a red LED located near the center of the board
using a short on/off cycle (approximately 200-ms on and 200-
ms off).
To verify that the board is functioning correctly, the LED will
display a repetitive 1 second on, 1 second off "heartbeat". Do
Red
not confuse this "heartbeat" with the error flash codes shown
LED 1
in the table below. To prevent confusion, a 1-flash, flash code
On
is not used.
Off
On
TABLE 29: VAV CONTROL BOARD FLASH CODES
Off
FLASH CODE
On
Off
On Steady
On
1 Flash
Off
2 Flashes
On
3 Flashes
Off
4 Flashes
On
5 Flashes
Off
6 Flashes
On
7 Flashes
Off
8 Flashes
On
Off
9 Flashes
10 Flashes
11 Flashes
12 Flashes
13 Flashes
14 Flashes
15 Flashes
OFF
DESCRIPTION
Control Failure
Not Applicable
Loss of Communication with UCB
Space Sensor Failure
SAT Sensor Failure
RAT Sensor Failure
OAT Sensor Failure
OH Sensor Failure
RH Sensor Failure
IAQ Sensor Failure
OAQ Sensor Failure
APS Sensor Failure
Limit 2 Switch Open
Purge
VFD Input Failure
Dirty Filter Switch
No Power or Control Failure
Johnson Controls Unitary Products
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Troubleshooting
