Laars Mascot II, Installation And Operation Instructions Manual

Mascot II Boilers and Water Heaters

Page 35

SECTION 11.
Maintenance

 WARNING

Disconnect all power to the appliance before
attempting any service to the appliance. Contact with
electricity can result in severe injury or death.

11.1  System Maintenance

(yearly, unless otherwise noted)

1.

If a strainer is employed in a pressure reducing
valve or the piping, clean it every six months.

2.

Inspect the venting system for obstruction or
leakage at least once a year. Periodically clean the
screens in the vent terminal and combustion air
terminal (when used).

3.

Keep the appliance area clear and free from
combustible materials, gasoline, and other
flammable vapors and liquids.

4.

If the appliance 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 system
yearly.

7.

When a means is provided to neutralize
condensate, ensure that the condensate is being
neutralized properly.

8.

Removal of burner door and inspection of
combustion coil and flue passages is required at
least once a year. Clean with a soft bristle brush /
vacuum or wash with water if necessary. Sooting
and buildup on the coils is an indication of
improper set up and poor combustion. Determine
the cause and make corrections.

9.

Inspect the vent system and air intake system, and
ensure that all joints are sealed properly. If joints
need to be resealed, completely remove existing
sealing material, and clean with alcohol. Apply
new sealing material, and reassemble.

11.2  Appliance Maintenance and

Component Description

Use only genuine LAARS replacement parts.

 Caution

Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.

Mascot II gas and electric controls are engineered

for long life and dependable operation, but the safety of
equipment depends on their proper functioning. Only a
qualified service technician should inspect the basic

items listed below every year:

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

11.2.1  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 32

).

Remove the 5 bolts, which hold the burner arm in place.
Pull burner up and out. Clean 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, and correct. If
damaged, replace the burner gasket 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.

11.2.2  Appliance Control

Mascot II has an integrated control that

incorporates manual reset high limit control, operating
temperature control, modulating control, ignition
control, outdoor reset control, pump control and many
other features. If any of these features are thought to be
defective, please consult the factory for proper trouble
shooting practices prior to replacing the control. If
control replacement is required, turn off all power to the
appliance and shut off all manual gas valves to the
appliance. Remove the front door to the appliance and
the control panel plastic bezel. Remove all wire
connections from the control board. The control board
connections are keyed to only allow connection in the
proper location, but proper handling techniques should
be used to avoid damage to the wiring or connectors. To
remove the control push in on the two tabs on the left
side of the board to unlatch the clips from the control
panel. Rotate the control around the fastening points on
the right side of the control to remove the hooks from
the control panel. To replace the control repeat the steps
above in the reverse order making sure to connect all
wires in the proper location. Place the appliance in
operation following the steps outlined in 

Section 10

.

11.2.3  Ignitor Assembly

The ignitor assembly is a two rod system that

consists of a ground rod and a sense rod. To remove the
ignitor assembly, shut off the 120 Volt power supply to
the appliance. Turn off all manual gas valves connecting
the appliance to the main gas supply line. Remove the
front door of the boiler to gain access to the ignitor
assembly. Remove the two wires connected to the
assembly. Then remove the two bolts connecting the
ignitor assembly to the burner door. Remove and
replace the old ignitor assembly gasket. Reinstall a new