LAARS Pennant PNCV (Sizes 500-2000) - Install and Operating Manual - Manual (Page 48)

LAARS Heating Systems Page 48
SECTION 7.
Maintenance
7.1 System Maintenance
1. Lubricate the system water-circulating pump, if
required, per the instructions on the pump.
2. If a strainer is employed in a pressure reducing
valve or the piping, clean it every six months.
3. 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).
4. Keep the appliance area clear and free from
combustible materials, gasoline, and other
flammable vapors and liquids.
5. 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. All
systems connected to it should also be drained or
protected from freezing.
6. Low water cutoffs, if installed, should be
checked every 6 months. Float type low water
cutoff should be flushed periodically.
7. Inspect flue passages, and clean with brushes/
vacuums, if necessary. Sooting in flue passages
indicates improper combustion. Determine the
cause and correct.
8. Inspect the vent system and air intake system,
and if the vent system is Category III, 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 re-assemble.
7.2 Appliance Maintenance and
Component Description
Only genuine Laars replacement parts should be used.
Caution
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
See Figures 31 and 32 for location of gas train
and control components.
The gas and electric controls on the appliance
are engineered for long life and dependable operation,
but the safety of the equipment depends on their
proper functioning. It is strongly recommended that
a qualified service technician inspect the basic items
listed below every year:
a. Ignition controls d. Automatic gas valve
b. Ignitors e. Pressure switches
c. Water temperature f. Blowers
control
7.2.1 Burners
Close main manual gas valve before proceeding.
Checking the burners for debris - Remove the ignitor
inspection panels(s) and ignitor(s) and inspect the
burners through the ignitor hole(s) using a flashlight
to illuminate. If there is any indication of debris on
the burners that are visible, all the burners will need
to be inspected more thoroughly. Remove the screws
from around the front of the air box (large panel from
which the ignitor inspection panel(s) were removed),
and remove the large panel. Remove the gas manifold
assemblies and the burner panels. Inspect the burners.
Clean burners, if necessary, by blowing compressed
air from the outside of the burners into the center
of the burner. A dirty burner may be an indication
of improper combustion or dirty combustion air.
Determine the cause, and correct. Replace the burners
in the reverse order
7.2.2 Filter
The filter used in the Pennant is washable with
an 83% arrestance. Since the filter is washable, it will
only need replacement when unwashable, deteriorated
or damaged. If filter replacement is needed, it should
only be replaced with a factory part. Inspect the air
filter. If there is debris on the air filter, remove it from
the filter box, and wash it with mild soap and water.
Ensure that the filter is completely dry before re-
installing, in reverse order.
7.2.3 Gas Valves
The gas valves are designed to operate with
supply pressures of 4-13 inches w.c. (1.0 to 3.2 kPa).
To remove a valve, shut off 120-volt power
and the manual gas shutoff valve. Remove the top
front panel from the unit. Disconnect the wires to the
valve. Disengage the flanged fitting before and after
the valve, and remove the valve. Re-install in reverse
order. Ensure o-rings are properly installed for both
inlet and outlet. Turn on manual gas shutoff valve and
120 volt power and check appliance operation and
tightness of gas valve connections.
7.2.4 Manual Reset High Limit Control
The high limit switch is manual reset switch with
an adjustable set point, up to 240°F (116°C) on boiler
models and 200°F (93°C) on water heater models
and boilers ordered with low temperature controls. To
replace the switch, shut off the 120-volt power to the
appliance. Remove the cover from the switch to access
the mounting screws. Remove the screws, and pull the
switch off the control panel. Remove the capilliary
and bulb from the thermal well located in the header.
Replace in reverse order.
7.2.5 Automatic Reset High Limit Control
An automatic reset high limit is used in addition
to the manual reset high limit. The high limit switch
has an adjustable set point, up to 240°F (116°C) on
boiler models and 200°F (93°C) water heater models