LAARS Pennant PNCV (Sizes 200, 300, 400) - Install and Operating Manual - Manual (Page 27)

LAARS Heating Systems
Page 26 Pennant 200, 300, 400 Page 27
15. After placing the unit in operation, the ignition
system safety shutoff device must be tested.
First, shut off the manual gas valve, and call
the unit for heat. After the pre-purge and ignitor
heat-up time, the main gas terminals will be
energized, attempting to light, for seven (7)
seconds, and then will de-energize. The unit will
attempt to light two more times, and then will go
into lockout mode. Second, turn the power off
and then on again, open the manual gas valve
and allow the unit to light. While the unit is
operating, close the manual gas valve and ensure
that power to the main gas valve has been cut.
16. Within three (3) days of start-up, recheck all air
bleeders and the expansion tank as described in
Steps 4 and 8 above.
Important: The installer is responsible for identifying
to the owner/operator the location of all emergency
shutoff devices.
WARNING
Do not use this appliance if any part has been
under water. Immediately call a qualified service
technician to inspect the appliance and to replace
any part of the control system and any gas control
that may have been under water.
AVERTISSEMENT
N’utilisez pas cet appareil si l’une de ses pièces
est passée sous l’eau. Appelez tout de suite un
technicien en entretien et en réparation pour
inspection de l’appareil et remplacement des
pièces du système de commande, et des pièces de
commande du circuit gaz, qui sont passées sous
l’eau.
6.2 Pennant Controller
Pennant 200-400 units feature a custom-
configured digital control system that is capable of
monitoring the temperature in two different loops.
Loop 1 is the Pennant loop, which uses thermistor
1, mounted in the inlet of the Pennant. Loop 2 is a
secondary loop, using the auxiliary thermistor (called
thermistor 2) provided loose with the Pennant.
Thermistor 2 can be installed where the user
chooses (in a tank, or in system piping, etc.) and is
connected to Pennant terminals 9 and 10. It is activated
in the Pennant controller menu (see section 6.6).
Auxiliary contacts in the Pennant controller will close
when Loop 2 calls for heat, and these contacts can be
used to energize a pump relay, or other device that the
user chooses.
6.3 Local / Remote Switch
A call for heat can be initiated by the Pennant
controller, or by an external controller. When an
external controller, such as a tank aquastat or multiple
boiler control, is used, it is connected between
Pennant terminals 3 and 4. With the switch in the
Remote position, the external controller is included
in the Pennant sequence of operation, and the Remote
indicator light on the front panel is illuminated. If
an external control is not used, put the switch in the
Local position, and terminals 3 and 4 are left out of the
sequence.
6.4 Sequence of Operation
The amber “Ready” light on the front panel
indicates that the control system is energized. Upon a
call for heat, the green “Call for Heat” indicator on the
front panel will light.
The pump time delay relay will receive a signal
to initiate. If the unit is pump-mounted, the pump
will be energized. The pump terminals on the field-
wiring terminals strip will energize a field pump that
is properly interlocked with the Pennant. The green
“Water Flow” indicator on the front panel will light,
once proper flow has been established by the water
flow switch.
Once the water flow switch makes, if all of the
safety interlocks are closed, the ignition module will
energize the blower(s) for a 15-second pre-purge,
followed by a 40-second period to allow the ignitor to
heat.
The ignition control energizes the blower. The
blower pressurizes the air box (which supplies air to
the burners) and closes the normally-open contact
on the airflow pressure switch. The blocked vent
pressure switch senses the pressure in the exhaust
plenum. This switch opens if the pressure is excessive
(as an indicator of a blocked vent). When these two
pressure switches are closed, voltage is sent to the
PSW terminal on the ignition control, which allows the
ignition module to proceed with the ignition sequence.
If the airflow proving circuit is not proven, the
ignition module will lock out, and the temperature
controller will display the air flow fault, AFF. The
ignition control LED will display its one-flash
sequence, as well. Section 6.5 describes the result of
air flow faults in more detail.
When the ignition control gets the signal at the
PSW terminal, it will energize its MV terminal, which
sends power to the stage one (or on/off) main valve.
The green Stage 1 indicator on the front panel will
light.
After a 7-second trial for ignition, the ignitor
switches to flame sense mode. If a flame is not
detected, the gas valve will close and the ignition
module will attempt ignition again (up to two more
times, for a total of three attempts.) If all three
attempts fail, the ignition control will lock out.
If flame is sensed, the burner will continue to
fire as long as there is a call for heat, and none of the
safety circuit is interrupted.