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Page 94
SECTION 11 Maintenance
11.A System Maintenance
Do the following once a year:
1.
Lubricate the System pump, if required, per the
instructions on the pump.
2.
Inspect the venting system for obstruction
or leakage. Periodically clean the screens in
the vent terminal and combustion air terminal
(when used).
3.
Keep the area around the unit clear and free
of combustible materials, gasoline, or other
flammable vapors or liquids.
4.
If the unit is not going to be used for extended
periods in locations where freezing normally
occurs, it should be isolated from the system
and completely drained of all water.
5.
Low water cutoffs, if installed, should be
checked every year. Float type low water
cutoffs should be flushed periodically.
6.
Inspect and clean the condensate collection,
float switch and disposal system yearly.
7.
When a means is provided to neutralize
condensate, ensure that the condensate is
being neutralized properly.
8.
Inspect the flue passages, and clean them
using brushes or vacuums, if necessary.
Sooting in flue passages indicates improper
combustion. Determine the cause of the
problem and correct it.
9.
Inspect the vent system and air intake system,
and ensure that all joints are sealed properly.
If any joints need to be resealed, completely
remove the existing sealing material, and clean
with alcohol. Apply new sealing material, and
reassemble.
10. Once a year, the items listed below should
be inspected/tested by a qualified service
technician:
a. Appliance control
b. Automatic gas valve
c. Pressure switches
d. Blower
e. Pump
Do the following once every six months:
1.
If a strainer is employed in a pressure reducing
valve or the piping, clean it every six months.
f. Flow switch
g. Low water cutoff
h. Burner
i. Heat exchanger
j. Pressure Relief
valve
LAARS Heating Systems
WARNING
Disconnect all power to the unit before
attempting any service procedures. Contact with
electricity can result in severe injury or death.
11.B Maintenance Notes
Use only genuine Manufacturer replacement parts.
When servicing the controls, label all wires be-
fore disconnecting them. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
The gas and electric controls in the unit are
engineered for long life and dependable operation,
but the safety of the equipment depends on their
proper functioning.
11.B.1 Burner
Check the burner for debris. Remove the blower
arm assembly to access the burner. Remove the 4
bolts connecting the blower to the arm. (See"Figure
52. Burner Detail" on page 123). Remove the 5
bolts which hold the burner arm in place. Pull the
burner up and out. Clean the burner, if necessary,
by blowing compressed air from the outside of the
burner into the center of the burner, and wipe the
inside of the burner clean with glass cleaner. A dirty
burner may be an indication of improper combustion
or dirty combustion air. Determine the cause of
the problem, and correct it. If the burner gasket is
damaged, replace it when replacing the burner.
Note - When installing the burner, make sure the
flange is aligned with the mating surface, as each is
keyed to control
fit.
11.B.2 Modulating Gas Valve/ Venturi
The modulating gas valve consists of a valve body
that incorporates the On/Off gas flow control and
a negative pressure regulator. It provides the air/
gas ratio control in combination with the Venturi to
the unit. It is designed to operate with gas supply
pressure between 4 and 13 inches w.c.. To remove
the gas valve and or Venturi, shut off the 120 Volt
power supply to the boiler. Turn off all manual gas
valves connecting the boiler to the main gas supply
line. Remove the front door of the boiler to gain
access to the gas valve and Venturi. Disconnect the
four flange bolts connecting the gas manifold pipe
Caution
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Troubleshooting
