User manual A.O. Smith 101

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kBtu rating of the boiler (0 to 5750kBtu in 10kBtu increments)  
The software revision level of the MCB.  
From the Current Error Screen this key is used to reset the  
system from an error:  
Current Error Screen:  
Up and Down Keys:  
Displays the last error that the system has detected plus a  
time stamp of when the error occurred. (The time stamp is  
based on the elapsed hours value at the time the error  
occurred. It is displayed in hours and minutes. This error  
remain displayed as long as it is still valid. When cleared  
it is moved to the Error History Screen. The system will  
automatically jump to this screen when an error is detected.  
It will also go to this screen upon power-up if an error was  
still valid when power was turned off.  
These keys are used to move upwards and downwards in  
screens to reach a desired item and to change setpoints  
and user settings. They have an auto increment/decrement  
feature for some of the configurations and values. When  
you first press one of the keys and value changes by 1  
count, then wait 1/2 second and changes slowly until the  
key is released or if held for 3 or more seconds it will  
change the value quickly.  
Help Key:  
NOTE: Errors are cleared from this screen by pressing  
the "select" key.  
Pressing the Help key from any screen displays helpful  
information about that screen. From the menu screen,  
general help information is displayed as to how to use  
the user interface. To return to the previous screen press  
the Help or Select keys, or press Menu key to go to the  
menu screen. If a small down arrow appears in the lower  
right hand corner then there is off screen content below  
what is displayed. Press the down arrow to scroll down  
to this information. After scrolling down an up arrow will  
appear in the upper right hand corner to indicate off  
screen content above what is displayed.  
Error History Screen:  
This screen displays a list of the last 9 errors (with time  
stamps) that have occurred. The last error to occur is  
displayed first.  
Reload Defaults Screen:  
From this screen the user can restore the factory default  
values for screen adjustable configurations by pressing  
the Select key. The values restored are as follows:  
VW Models  
Oper Setpnt (Operating Setpoint) - 145° F (63° C)  
Hi Limit (High Limit Setpoint) = 210° F (99° C)  
Hi Limit Dif (High Limit Differential) = 20° F (11° C)  
The three LED's to the right of the LCD indicate the status of  
the overall system. The red LED indicates that a fault has been  
detected and the system has stopped running. It is on  
continuously for soft faults and flashes for hard faults. The  
Yellow LED indicates that the boiler is in a ready mode waiting  
for a call for heat command. When on continuously the Green  
LED indicates that the system is in the heating mode. If it is  
flashing it indicates that the UIM is in the initialization mode  
and the touch switches are being calibrated.  
VB Models  
Oper Setpnt (Operating Setpoint) = 190° F (88° C)  
Hi Limit (High Limit Setpoint) = 230° F (110° C)  
Hi Limit Dif (High Limit Differential) = 20° F (11° C)  
Both Models  
Tempert Units (Temperature Units) = F  
Post Cir Secs (Post Circulation pump delay = 45 seconds  
Network Address (Network Address) = (none)  
The VF boiler has a display on the UIM which is a scaled display  
indicating the current firing rate of the boiler (25% to 100%).  
UIM Touch Switches  
Below the LCD display are five touch switches or keys, that the  
operator uses to operate the system.  
Fault Messages and Troubleshooting Guide  
Menu Key:  
The EMC 5000 modulation system does excessive self-diagnostics  
Pressing this key activates the menu screen where the other and displays detected faults on the UIM display in an easy to read  
screens can be accessed.  
manner. There are approximately 80 different faults that can be  
detected. Some of the faults are caused by internal problems and  
some by external causes. The faults create different types of system  
Select Key:  
This key performs several functions. Screens can be selected  
from the menu screen by pressing this key when the ">" appears lockouts (shut down). Hard lockouts are serious problems that  
next to the screen desired.  
require the user to manually restart the system. Soft lockouts can  
be reset by the user or after 60 minutes the system will automatically  
clear the error and restart. Auto Reset lockouts will monitor the  
cause of the fault and it the fault clears itself the system resets  
can be selected with this key. If a setpoint configuration item is  
selected, the ">" will then flash slowly to indicate that the item has  
been selected. The Up and Down keys are then used to change itself. The following table shows the fault messages and some  
its value.  
possible troubleshooting hints:  

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