LAARS Pennant PNCV (Sizes 500-2000) - Install and Operating Manual User Manual
Page 25
Pennant
(500-2000)
Page 25
Figure 14. Field Wiring Panel
Figure 15. External Control Connection Wiring.
per the suggested piping diagrams, and connected to
the “S C2” and “SUP S” terminals. See
Section 6.3
for “Mode” definitions and
Figures 22 to 24
for field
wiring schematics.
Outdoor Reset Sensor: The outdoor reset
sensor, if used, is connected to the “OD S” and “S C2”
terminals.
Field Installed Pump: A pump contactor can
be wired to the “PMP” and “PMP” terminals (these
terminals supply 24VAC to close the contactor
whenever the boiler pump would be operated).
NOTE: In some cases, the boiler pump is operated
continuously.
External Alarm: An external power supply and
alarm can be connected to the “ALRM” and “ALRM”
terminals. In the event of an ignition system lockout, a
contact closure occurs across these terminals.
External Heat Demand Indication: 24VAC
is present across the “HT OUT” and “LWCO GND”
terminals whenever the temperature control sees a
system heat demand. This can be used to power a
contactor (0.5 Amp, maximum) for devices operated
whenever the boiler could fire (combustion air fans,
motorized louvers, etc.) NOTE: In some cases, the
temperature control will always see a heat demand
in the system, such as when the “Ht D” and Com D”
terminals are jumpered.
Other Field Interlocks: To install other field-
wired devices to interlock with the boiler (louver
switches, flow switches, etc.), remove the jumper
between the “COM” and “NO” terminals and wire the
device in series across these terminals. (See
Section
5.3
for important information about external staging
controls and building automation systems.)
System Heat Demand: Remove the jumper
across the “COM D” and “Ht D” terminals, and con-
nect the zone pump or valve end switch, thermostat,
aquastat, or other indication of system heat demand
to these terminals. If no indication of a system heat
demand will be provided, the jumper must remain
in place. When jumpered, the temperature control
will always see a heat demand, and the Pennant
pump (if equipped) or any pump with its contactor
connected to the “PMP” and “PMP” terminals will
run continuously. In addition, any device connected
through the “HT OUT” and “LWCO GND” terminals
for an external indication of the heat demand will
run continuously. See
Section 6
for more information
on the system heat demand for various modes of
operation.
Refer to
Figures 22 through 24
for field wiring of
additional components.