LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 68)

LAARS Heating Systems Page 64
Section 11
MAINTENANCE
WARNING
Disconnect all power to the unit before
attempting any service procedures. Contact
with electricity can result in severe injury or
death.
11.1 System Maintenance
Do the following once a year:
1. Lubricate all the pumps in the system, 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 by a qualified service technician:
a. Appliance control f. Flow switch
b. Automatic gas valve g. Low water cutoff
c. Pressure switches h. Burner
d. Blower i. Heat exchanger
e. Pump j. Ignitor
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.
11.2 Maintenance Notes
Use only genuine LAARS replacement parts.
Caution
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 MagnaTherm are
engineered for long life and dependable operation,
but the safety of the equipment depends on their
proper functioning.
11.2.1 Burner
Check the burner for debris. Remove the blower
assembly to access the blower adapter plate.
Remove the 4 bolts connecting the blower to the
arm. Remove the 5blower adapter plate to access
the burner. 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 gaskets are damaged, replace them when
replacing the burner.
11.2.2 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 fuel/air mixer
to the unit. It is designed to operate with gas supply
pressure between 4 and 13 inches w.c.. To remove
the gas valve or fuel/air mixer, shut off the power
supply to the boiler. Turn off all manual gas valves