LAARS Pennant PNCP - Install and Operating Manual - Manual (Page 21)

Pennant Pool Heater Page 21
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
controls the blower’s pre-purge and post-purge.
Pennant sizess 500, 750 and 1000 have one ignition
control. Sizes 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 sizess 500, 750 and
1000 have one ignitor. Sizes 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 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 unit uses a paddle-type flow switch to en-
sure 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