LAARS Pennant PNCV - Install and Operating Manual - Manual (Page 34)

LAARS Heating Systems Page 34
ate for powering the gas valves. It also controls the
blower’s pre-purge and post-purge. Pennant models
500 through 1000 have one ignition control. Models
1250 through 2000 have two ignition controls.
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 Ignitor
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 through
1000 have one ignitor. Models 1250 through 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. To avoid injury, handle the ignitor
with caution.
Attention
Le dispositif d’allumage devient très chaud.
Manipulez le dispositif d’allumage avec précaution.
7.2.9 Transformer
The Pennant’s transformer is not capable of
supplying control voltage for external devices such
as zone valves, which must have their own separate
power supply.
Some Pennant units have more than one
transformer, and all transformers are not the same
size, so ensure that replacement transformers are the
appropriate ones.
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.
7.2.10 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. Models 500, to 1000 each have one blower,
and models 1250 to 2000 each have two blowers.
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.
7.2.11 Flow Switch
The Pennant uses a paddle-type flow switch to
ensure that the unit has water flow before ignition is
allowed. To replace the flow switch, turn off the 120-
volt power to the appliance. Isolate the boiler or water
heater from the system by closing the isolation valves.
Caution
Water may be hot enough to scald. Allow water to
cool before proceeding.
Attention
L’eau peut être chaude au point de vous brûler.
Laissez refroidir l’eau avant d’intervenir.
Release pressure in the system by actuating
the pressure relief valves or field supplied boiler
drain valve. Remove cover from the flow switch
and disconnect the wires. Unthread the flow switch
from piping. Ensure the new flow switch paddles are
trimmed to the same size as the original paddles, and
reinstall in the reverse order. For boiler and other static
pressure systems, restore the system pressure to the
original setting (or 10 psi minimum).
7.2.12 Heat Exchanger Coil
WARNING
Black carbon soot buildup on a dirty heat exchanger
can be ignited by a random spark or flame thereby
creating a risk of fire or explosion. To prevent this
from happening, dampen the soot deposits with a
wet brush or fine water spray before servicing the
heat exchanger.
AVERTISSEMENT
L’accumulation de suie sur un échangeur thermique
sale peut s’enflammer au contact d’une étincelle ou
d’une flamme et présenter un risque d’incendie ou
d’explosion. Afin d’empêcher que cela se produise,
humidifier les dépôts de suie à l’aide d’une brosse
mouillée ou par une pulvérisation fine d’eau avant
d’effectuer l’entretien de l’échangeur thermique.
The Pennant has a premixed 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
the side of the boiler. In the unlikely event that there is
a buildup of black carbon soot or other debris on the
heat exchanger, clean per the following: