Laars Pennant PNCP Installation And Operation Instructions Manual - page 19
Pennant Pool Heater
Page 19
in this manual. Use caution in handling the blower,
ensuring you do not put pressure on the blower wheel.
7.2.12 Flow Switch
The Pennant uses a paddle-type flow switch to
ensure that the unit has water flow before ignition is
allowed.
7.2.13 Heat Exchanger Coil
Caution
Black carbon soot buildup on a dirty heat exchanger
can be ignited by a random spark or flame. To
prevent this from happening, dampen the soot
deposits with a wet brush or fine water spray before
servicing the heat exchanger.
The Pennant has a pre-mixed burner system.
These systems provide the burners with sufficient air
for complete combustion, and black carbon sooting is
seldom experienced. If sooting is suspected, view
ports for inspection of the heat exchanger are provided
on both sides of the heater. They are located below the
headers, and are accessed by opening the small round
cover that is attached by one screw. In the unlikely
event that there is a buildup of black carbon soot or
other debris on the heat exchanger, clean per the
following:
1.
Disconnect the electrical supply to the unit.
2.
Turn off the gas supply by closing the manual
gas valve on the heater.
3.
Disconnect and remove the wires, conduit and
sensors from all components that are attached to
the inlet/outlet header.
4.
Isolate the heat exchanger from the water supply.
5.
Disconnect the header flanges from the inlet and
outlet.
6.
Allow the heat exchanger to drain. Remove the
front cover(s). Remove the venting and remove
the top, by removing the screws that attach the
top to the side panels. Remove the side panels.
Remove the front lower panels sealing the
combustion area. To remove the gas train,
disconnect the unions located above the
intermediate pan and the field installed union
located outside the cabinet, and pull up, bringing
the union end connectors through the grommets
in the intermediate pan. To remove the
intermediate pan, remove the slide out control
assembly and blower(s) to reveal the screws.
Remove the screws holding the intermediate pan,
and lift up to remove it. The heat exchanger has
integral metal sections attached, which connect
to the frame of the boiler. Locate and remove
the screws along the front, rear and bottom of the
integral metal sections, and remove the heat
controls the blower’s pre-purge and post-purge.
Pennant models 500, 750 and 1000 have one ignition
control. Models 1250, 1500, 1750 and 2000 have two
ignition controls. On these models, one ignition
control provides for part-load start-up and the second
control brings the heater to full rate, after the first
control has started the part-load burners.
To replace a control, shut off the 120-volt power
to the appliance. Remove the cover from the control
panel. Remove the electrical connectors from the
ignition control. Take out the controller’s mounting
screws, and pull the controller out. Replace in reverse
order.
7.2.8 Ignitors
The ignitors used are 120v “Hot Surface” type.
They are energized whenever there is a call for heat
and switched off when ignition is established and the
flame has been sensed. Pennant models 500, 750 and
1000 have one ignitor. Models 1250, 1500, 1750 and
2000 have two ignitors. To replace the ignitor, shut off
the 120- volt power to the appliance, remove the
ignitor access panel, disconnect the Molex connector,
remove the two mounting screws on the ignitor flange,
and pull the ignitor out. Install in reverse order,
always using a new ignitor gasket with the
replacement ignitor.
Caution
Ignitor gets hot.
7.2.9 Ignition Sensors
The ignition sensors ensure that the main flame
is ignited, so that raw gas is not allowed to fill the
combustion chamber. The ignitors are the ignition
sensors on Pennant appliances. There are no separate
ignition sensors.
7.2.10 Transformer
The Pennant’s transformer is not capable of
supplying control voltage for external devices. Should
a transformer need replacing, shut off the 120-volt
power. Unplug the transformer wires, remove the
mounting screws and remove the transformer. Replace
transformer in the reverse order.
7.2.11 Blowers
The combustion air blowers bring the
combustion air for the Pennant from the upper
chamber to the lower chamber. Mixing of the gas and
air occurs in the burners. If a blower change is
required, turn off the 120-volt power and gas supply to
the unit. Remove the front panel. Disconnect the
blower’s wire harness. Remove the screws at the
blower flange, and pull the blower out. Replace
blower in reverse order, ensuring that all joints are
made correctly. After replacement, ensure that the unit
operates properly, by following the set-up procedure