Laars Pennant PNCP, Installation And Operation Instructions Manual

LAARS Heating Systems

Page 18

only need replacement in very rare cases. 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 unions before and after the valve, and
remove the valve. Pull the pipe nipples from the inlet
and outlet of the valve, and clean the threads on the
pipe nipples for re-use. Apply pipe dope to the pipe
nipples (threaded joints should be coated with piping
compound resistant to action of liquefied petroleum
gas), and re-install in reverse order. Turn on manual
gas shutoff valve and 120 volt power and check
appliance operation and tightness of gas valve
connections.

7.2.4 Pool Loop High Limit Control

The high limit switch is an automatic reset

switch with an adjustable set point, up to 135°F
(57°C). 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 capillary and bulb from the thermal well
located in the pool loop adjacent to the heater outlet.
Replace in reverse order.

7.2.5 Automatic Reset High Limit Control

An automatic reset high limit is used to limit

heater water from exceeding 200°F. The high limit
switch has an adjustable set point, up to 190°F (88°C).
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
capillary and bulb from the thermal well located in the
header. Replace in reverse order.

7.2.6 Temperature Control

The temperature control is a single stage control.

To replace the control, shut off the 120-volt power to
the appliance. Unplug all of the electrical connectors,
remove the retainer clip and the control. Replace in
reverse order.

7.2.7 Ignition Controls

The ignition controls ensure the proved

interrupted-type ignition system. They control the hot
surface ignitor(s) and prove that the flame signal is
appropriate for powering the gas valves. It also

cutoff should be flushed periodically.

6.

Inspect flue passages, and clean with brushes/
vacuums, if necessary. Sooting in flue passages
indicates improper combustion. Determine the
cause and correct.

7.

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 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 7 through 11 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

b.

Ignitors

c.

Water temperature control

d.

Automatic gas valve

e.

Pressure switches

f.

Blowers

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