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8. OPERATION
Lighting Instructions
1. Before operation, make sure you have read all of the
safety information in this manual.
2. Remove upper front panel.
3. Set the thermostat to the lowest setting.
4. Turn off all electrical power to the appliance.
5. This appliance is equipped with an ignition device
which automatically lights the burner. Do not try to
light the burner by hand.
6. Turn on main manual gas valve field installed near
gas inlet connection on back of heater.
7. Wait 5 minutes to clear out any gas. Then smell for
gas, especially near the floor. If you then smell gas,
STOP! Follow the steps in the safety information on
the front cover of this manual. If you do not smell
gas, go to next step.
8. Turn on all electrical power to the appliance.
9. Set thermostat to desired setting. The appliance
will operate. The igniter will glow after the pre-
purge time delay (15 seconds). After igniter reaches
temperature (30 seconds) the main valve should
open for a 4-sec trial for ignition. System will try
for ignition up to three times (one time on optional
single-try ignition module). If flame is not sensed,
lockout will commence.
10. If the appliance will not operate, follow the instructions
"To Turn Off Gas To Appliance" on page 46" and
call your service technician or gas supplier.
11. Replace upper front panel.
12. If heater fails to start, verify the following:
a. There are no loose connections or that the
service switch is off.
b. High temperature limit switch (optional) is set
above water temperature or manual-reset high
limit is not tripped.
c. Enable/Disable circuit is closed.
d. Gas is on at the meter and the heater.
e. Incoming dynamic gas pressure to the gas valve
is NOT less than 4.0 in. WC for natural gas or
propane gas.
46
To Turn Off Gas To Appliance
1. Shut off manual gas valve field installed near gas
inlet connection on back of heater.
2. Remove upper front panel.
3. Adjust setpoint to lowest setting.
4. Turn off all electrical power to the appliance if service
is to be performed.
5. Replace access panel.
9. TROUBLESHOOTING
MVB Error Codes
If any of the sensors detect an abnormal condition or an
internal component fails during the operation of the MVB,
the display may show the error. This code may either
be the result of a temporary condition in which case the
display will revert to its normal readout when the condition
is corrected, or it may be the result of a condition that the
controller has evaluated as not safe to restart the unit.
In this case, the unit control will be locked out, requiring
the maintenance person to manually reset the control by
pressing and releasing the RESET button.
Heater Errors
When an error condition occurs, the controller will display
an error code on the display module. These error codes
and several suggested corrective actions are included in
the MVB Fault Text section on the following page.
Heater Faults
1. When a fault condition occurs, the controller will
flash a red light on the PIM and display the error
code on the user interface. The alarm output will also
be activated. Most fault conditions will also cause the
boiler pump to run in an attempt to cool the unit.
2. Note the error code, either through the flash code on
the PIM and/or from the Toolbox menu on the user
interface, and reference the explanation of the fault
along with troubleshooting steps in the MVB fault
text section.
3. Press and release the RESET button to clear the
fault on the user interface and resume operation.
Be sure to observe the operation of the unit for a
period of time to ensure correct operation and no
reoccurrence of fault code(s).
Raymote Troubleshooting
Please refer to the Raymote installation and operation
manual (241788).
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