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  kBtu rating of the boiler (0 to 5750kBtu in 10kBtu increments)

  The software revision level of the MCB.

  Current Error Screen:

  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.

 

NOTE: Errors are cleared from this screen by pressing 

the “select” key.

•  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)
  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)

UIM Touch Switches

Below the LCD display are five touch switches or keys, that the 

operator uses to operate the system.

•  Menu Key:

  Pressing this key activates the menu screen where the other 

screens can be accessed.

•  Select Key:

  This key performs several functions.  Screens can be selected 

from the menu screen by pressing this key when the “>” appears 

next to the screen desired.

  on the User Settings screen items that appear next to a “>” 

symbol 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 its value.

  From the Current Error Screen this key is used to reset the 

system from an error:

•  Up  and  Down  Keys:

  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:

  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.

UIM LED’s

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.

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%).

Fault Messages and Troubleshooting Guide

The EMC 5000 modulation system does excessive self-diagnostics 

and displays detected faults on the UIM display in an easy to read 

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 

lockouts (shut down). Hard lockouts are serious problems that 

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 

itself. The following table shows the fault messages and some 

possible troubleshooting hints:

Summary of Contents for VF VB 500

Page 1: ...e any phone in your building Immediately call your gas supplier from a neighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Installati...

Page 2: ...nces known to the State of California to cause cancer birth defects or other reproductive harm and requires businesses to warn of potential exposure to such substances This product contains a chemical...

Page 3: ...3 GENERAL SAFETY...

Page 4: ...trol assembly pro vided on the boiler met safe lighting and other performance criteria Detailed installation diagrams are found in this manual These diagrams will serve to provide the installer a refe...

Page 5: ...tally vented gas fueled heating appliance or equipment The sign shall read in print size no less than one half 1 2 inch in size GAS VENT DIRECTLY BELOW KEEP CLEAR OF ALL OBSTRUCTIONS INSPECTION The st...

Page 6: ...6 CONNECTION DIAGRAM...

Page 7: ...7...

Page 8: ...8 Figure 1 SCHEMATIC DIAGRAM VB VW 500 750 1000 SCHEMATIC DIAGRAM...

Page 9: ...9 LIGHTING OPERATION INSTRUCTIONS FOR MODELS VB VW 500 750 AND 1000...

Page 10: ...stem or something similar Through this connection multiple boilers can also be linked together CAUTION The internal communications cables should never be connected to the external communications conne...

Page 11: ...me rod is missing or shorted the flame will not be detected OUTPUTS FROM MCB Relay Contact Output Alarm MCB 24VAC optional Provides electrical power to operate an external alarm This can be an audio d...

Page 12: ...u activated screens Within each of the screens helpful information can be displayed by pressing the Help button The LED s visually inform the user about the mode the system is in The touch switches al...

Page 13: ...jump to the error state Description of FCB control states Idle State When any error is declared during idle state The system will remain in this state until the MCB request a heating cycle or a cold...

Page 14: ...to change the automatically resettable High Limit Setpoint 1 Press the MENU key 2 Scrollthe withtheDOWNkeynexttoUSERSETTINGSCREEN 3 Press the SELECT key 4 Scroll the with the DOWN key until it is poin...

Page 15: ...rds 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...

Page 16: ...ected wiring Note The MRHL can be checked by disconnecting the outlet probe from the MCB and reading the resistance across the two active pins on the connectorattheendoftheprobecable Thevalueshouldbea...

Page 17: ...Give reasonably quiet operation during initial ignition operation and extinction Cause no excessive lifting of flame from burner ports If the preceding burner characteristics are not evident check fo...

Page 18: ...ible shortened service life BURNER MAINTENANCE Qualified servicers should follow this procedure when the boiler s burner needs cleaning 1 Turn off the electrical power to the boiler and close the main...

Page 19: ...solidsexist Asthewaterisheated these tendtodropoutdepositingasscaleorlime Thisscalemustberemoved before the heat exchanger tubes become blocked DELIMING The amount of calcium carbonate lime released f...

Page 20: ...20 notes...

Page 21: ...21 notes...

Page 22: ...22 notes...

Page 23: ...ation for the boiler or any of its parts Some states and provinces do not allow limitations on how long an implied warranty lasts so the above limitation may not apply to you 5 CLAIM PROCEDURE Any cla...

Page 24: ...24 500 Tennessee Waltz Parkway Ashland City TN 37015 Technical Support 800 527 1953 Parts 800 433 2545 Fax 800 644 9306 www hotwater com...

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