LAARS Pennant PNCV (Sizes 500-2000) - Install and Operating Manual - Manual (Page 41)

Pennant (500-2000) Page 41
Caution
If the tank temperature control is set too high, a
potential for hot water scalding may exist.
Mode 2: Primary secondary piping.
Install a “supply sensor” in the primary loop
using the Laars part number R2014800 sensor
(included with every Pennant unit). Connect the sensor
to the “S C2” and “SUP S” terminals.
You must provide an indication of the system’s
heat demand by removing the jumper across the
“ComD” and “HtD” terminals on the field wiring
panel and connecting a zone valve or zone pump end
switch, thermostat, aquastat or other contact closure to
these terminals. If the “ComD” and “HtD” terminals
are left jumpered, the control will always see a heat
demand and remain in “Dem” mode, with the boiler
pump running continuously. See Section 5.2 for more
information.
A secondary aquastat, such as for a separate heat
exchanger for DHW, can be connected to the “Set D”
and “Com D” terminals. A call for heat from these
controls will start the boiler pump and cause the boiler
to fire.
If the boiler is not a pump mounted model, a
24VAC pump contactor may be connected to the
“PMP” terminals to control a field installed pump.
Program the temperature control to use Mode 2.
The AUTO/MAN switch must be in the AUTO position in
this mode.
Mode 4: Hydronic outdoor reset system
without primary / secondary piping.
Laars strongly suggests the use of primary
secondary piping with the Pennant boiler. This piping
style best ensures that the Pennant will have proper
water flow. However, non-primary secondary methods
can be used successfully, so this section has been
included.
Install the outdoor reset sensor, Laars part
number R2014000, and connect the leads to the “OD
S” and “S C2” terminals.
You must provide an indication of the system’s
heat demand by removing the jumper across the
“ComD” and “HtD” terminals on the field wiring
panel and connecting a zone valve or zone pump end
switch, thermostat, aquastat or other contact closure to
these terminals. If the “ComD” and “HtD” terminals
are left jumpered, the control will always see a heat
demand and remain in “Dem” mode, with the boiler
pump running continuously. See Section 5.2 for more
information.
Reset Override: An additional thermostat or aquastat
may be connected to the “Set D” and “Com D”
terminals. A call for heat from either of these controls
will start the boiler’s pump and cause the boiler to fire.
If the boiler is not a pump mounted model, a
24VAC pump contactor may be connected to the
“PMP” terminals to control a field installed pump.
Program the temperature control to use Mode 4.
The AUTO/MAN switch must be in the AUTO position in
this mode.
Mode 5: Primary secondary piping with
outdoor reset.
Install the outdoor reset sensor, Laars part
number R2014000, and connect the leads to the “OD
S” and “S C2” terminals. Install a “supply sensor”
in the primary loop using the Laars part number
R2014800 sensor (included with every Pennant
unit). Connect the sensor to the “S C2” and “SUP S”
terminals.
You must provide an indication of the system’s
heat demand by removing the jumper across the
“ComD” and “HtD” terminals on the field wiring
panel and connecting a zone valve or zone pump end
switch, thermostat, aquastat or other contact closure to
these terminals. If the “ComD” and “HtD” terminals
are left jumpered, the control will always see a heat
demand and remain in “Dem” mode, with the boiler
pump running continuously. See Section 5.2 for more
information.
A secondary aquastat, such as for a separate heat
exchanger for DHW, can be connected to the “Set D”
and “Com D” terminals. A call for heat from these
controls will start the boiler pump and cause the boiler
to fire.
If the boiler is not a pump mounted model, a
24VAC pump contactor may be connected to the
“PMP” terminals to control a field installed pump.
Program the temperature control to use Mode 5.
The AUTO/MAN switch must be in the AUTO position in
this mode.
Mode 6: Boiler with external staging control
(multiple boiler control, building
automation system, energy
management system, etc.)
Leave the jumper installed between “Ht D” and
“Com D” terminals. There are terminals on the field
wiring panel that must be wired per the instructions in
Section 5.3 of this manual. Other wiring methods
may be unsafe. The wiring in Section 5.3 of this
manual must be used.
The AUTO/MAN switch is located on the circuit
board in the slide-out control panel on the front of the
Pennant. This switch is placed in the manual position
(MAN) when an external control is controlling the
Pennant stages.
Program the temperature control to use Mode
6. Mode 6 tells the Pennant control that an external
staging control is being used.