EMX, EMXO and EMXGO SERIES WATER BOILERS
34-503 07/13
15
17 MAINTENANCE
CARBON MONOXIDE WARNING: An annual or seasonal combustion checkout must be performed by
a qualified service agency to ensure safe operation. Failure to maintain proper combustion can result
in injury or death.
Periodic inspection and checkout of the burner ignition, control system, and fuel valve operation (for tight
close-off) to ensure safe and reliable operation of this equipment. Refer to the burner installation instruction
for recommendations.
A preventive maintenance is recommended to assure a long, trouble-free life of the boiler. Refer to ASME
Section VII for a comprehensive plan for boiler operation, maintenance and lay-up.
Examine the venting system at least once each year for proper connections, alignment and corrosion. The
blower inlet will collect dust from the air during operation. Disconnect the power to the heater and clean the
blower wheel when necessary.
Inspect all parts and make replacements when necessary. Check wiring for loose connections and burned
wires.
WARNING: Turn off all electrical service to the appliance when accessing the controls located inside
the control cabinet. The cabinet contains high voltage wiring and terminals. If the electrical service is
not turned off and these wires or terminals are touched, a dangerous shock causing personal injury
or loss of life could occur. Close the control cabinet before restoring electrical service to the
appliance.
A table of periodic safety inspections is attached to this manual for ease of reference by the building service
technician or licensed equipment operator (Table 3, page 17). Since boiler designs vary, only some of these
listed inspections may be appropriate for your particular model.
Proper water treatment is critical to prevent corrosion as well as to reduce scale, both of which will reduce the
life of the boiler. Hydronic heating systems, steam heating systems and process steam systems all have
different treatment requirements. The makeup of the water, just as the blowdown, will vary with each
application. Rely on the recommendation of the water consultant.
CAUTION: Turn off all manual valves and burner electrical switches before removing any part for
service or cleaning. Do not push relay contacts in manually; accidental opening of main automatic
valve can result. Ensure there is no pressure on the vessel prior to disassembly of any water carrying
component to prevent serious injury.
1. Examine the venting system at least monthly for proper connections, alignment, or the presence of
corrosion. If corrosion appears, the boiler must not be operated until the corroded vent section(s) is
replaced.
2. Oil the blower motor and wipe oil and dust from the burner at regular intervals. The static fan will collect
dust from the air during operation. Clean the screen and fan blades if necessary. The burner should be
cleaned each year. Inspect all parts and make replacements when necessary. Check wiring for loose
connections and burned wires.
3. Periodic inspections and check-out of the burner ignition system, control system and fuel valve operation
(for tight close-off) should be made. Refer to the burner installation instructions for inspection
recommendations.
4. Inspect operating controls to ensure they are level, especially those containing mercury switches. Make
sure connecting tubing is not kinked or damaged on remote bulb thermostats.