LAARS Pennant PNCV (Sizes 200, 300, 400) - Install and Operating Manual - Manual (Page 28)

LAARS Heating Systems
Page 26 Pennant 200, 300, 400 Page 27
If there is a call for stage 2 on a 2-stage unit, that
valve will be energized, and the addition burner stage
will be indicated on the front panel with a green stage
2 light.
If there is a loss of flame signal during a
successful firing sequence, the ignition control will
remove power from the gas valves, and then attempt to
light up to two more times. If successful, the Pennant
will fire normally. If unsuccessful, the ignition control
will lock out.
Ignition lockout is noted on the ignition control
LED with a three-flash sequence and is noted on the
temperature control by displaying LOC.
When the call for heat is satisfied, the gas
valve(s) closes, and the blower starts a 45 second
post-purge. Any pump connected to the Pennant pump
time delay relay will continue to run for the time delay
period (dialed by the user, 0.1 to 10 minutes).
6.5 Ignition Control Reaction to Air Flow /
Blocked Vent Pressure Switch
Air flow and blocked vent status are continuously
monitored by the Pennant ignition control, at the
control’s PSW terminal.
At the start of an ignition sequence, if the ignition
control sees power at PSW for 30 seconds, but the
combustion blower has not yet been energized by the
control (F1 and F2), an air flow fault is signaled. The
ignition control will remain in this fault mode, with
the blower off. If the power to PSW is removed while
there is still a call for heat, the ignition sequence will
start again, but the main valves will not be energized
until PSW sees power during the ignition sequence.
At the start of an ignition sequence, the control
sends the combustion blower output (F1 and F2). If the
control does not see power at PSW for more than 30
seconds, an airflow fault is signaled, and the control
will remain in this fault mode, with the blower on. If
proper airflow is later detected on PSW, the control
begins a pre-purge and a normal trial for ignition.
If the PSW signal is lost while the Pennant is
firing, the control will immediately de-energize the
gas valve terminal (MV). The blower will remain on
for the post-purge period (45 seconds), and the control
will continue to monitor the PSW input. If the signal
is detected during the post-purge period, a normal trial
for ignition will begin, starting with the 15-second
pre-purge. If the signal is not detected during the post-
purge, the control will lockout with the blower off.
6.6 Programming the Temperature Control
6.6.1 Initial Controller Start-Up
When the Pennant is first powered up, the
temperature control display will show “801” (for a
water heater) or “802” (for a boiler) for approximately
one second. The default temperature parameter “°F1”
is then displayed for approximately one second, which
indicates that the default temperature parameter is
from thermistor 1, and is displaying in °F. Then, the
temperature at thermistor 1 will be displayed.
To display the temperature at thermistor 2, push
either the upper or lower button on the temperature
controller, to the right of the display. Thermistor 2
reading will be displayed for 5 seconds. To make the
thermistor 2 reading the default display, or to show the
temperatures in °C, program the control as shown in
sections 6.6.6 and 6.6.7.
6.6.2 Display Definitions
Tables 10 and 11 also show this information,
consolidated for quick reference.
Default Temperature Display – This is what
the user chooses to have displayed normally on
the controller. It can be either the temperature at
thermistor 1 (rt1) or at thermistor 2 (rt2) if used. While
the default temperature is displayed, the user may look
at the other temperature by pressing the upper or lower
button on the control. To access the programming
menu from here, press and hold the upper and lower
buttons at the same time until “SEL” is displayed.
SEL – Displayed when the upper and lower
buttons on the control are pressed and held while
the default temperature is displayed. This indicates
that you are entering the programming mode. When
the buttons are released, the first menu item, Ch1, is
displayed. If no buttons are pressed in 30 seconds, the
control will return to the default display.
Ch1 – Control loop 1 (thermistor 1). This is the
first display shown after entering the programming
mode. It is related to the Pennant temperature sensor,
thermistor 1. To view or make changes to the Ch1
parameters, press and hold the upper and lower
buttons at the same time. The sub menu items are
then displayed, one after another at approximately
two-second intervals. When the buttons are released,
the parameter that is showing can be changed by
pressing the upper or lower buttons. The new value is
functional immediately. To get to the next parameter,
press and hold both buttons again. After 30 seconds of
no button activity, the displays goes back to the default
temperature.
SP1 – Control loop 1 (Pennant) temperature set
point. Factory default is 165°F (74°C) for boilers,
and 130°F (54°C) for water heaters. It is adjustable
130°F to 220°F (54°C to 104°C) for boilers and 130°F
to 190°F (54°C to 88°C) for water heaters. Stage 1
is energized when the temperature at the Pennant
sensor is less than or equal to SP1-td1. Stage 1 is de-
energized when the temperature at the Pennant sensor
is greater than, or equal to SP1.
td1 – Control loop 1 (Pennant) temperature set
point differential. Factory default is 10°F (6°C) for
boilers and 5°F (3°C) for water heaters. It is adjustable
from 2°F to 20°F (1°C to 11°C). This defines the
temperature below the setpoint that stage 1 is
energized on a fall in temperature.