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

Addendum to Doc. 1195
Addendum to Pennant Instruction Manual
Figure 1. External Control Jumpers.
This Addendum applies to the following Documents:
Models Affected Sizes Part No. Doc. No.
Pennant Boilers / Water Heaters 200-400 H0276800- Doc. 1195
Additional Control Information
Pennant units are shipped with a thermistor that is
connected to the Pennant wiring strip terminals 9 and 10.
It is not installed in any water path. This thermistor,
called thermistor #2, can be used to call the Pennant for
heat, based on a temperature external to the Pennant
(such as in a system loop, or storage tank).
In order for the control to allow this thermistor to
call the Pennant for heat, place a jumper between
Pennant terminals 3 and 11, and place a jumper between
Pennant terminals 4 and 12. (Note that terminal 1 is on
the right side of the terminal strip, and terminal 12 is on
the left.) See figure 1.
Ensure that the "Local/Remote" switch is in the
"Remote" position.
The control will recognize this sensor as long as
control loop 2 is enabled. Control loop 2 is enabled by
default. To verity that it is enabled, or to change its
status:
1. While the default temperature is displayed, press and
hold the upper and lower buttons on the Pennant
temperature control at the same time, until 'SEL' is
displayed.
2. Release the buttons, and 'CH1' will be displayed.
3. Within 30 seconds, press the upper (or lower) button.
'CH2' will be displayed.
4. Within 30 seconds, press and hold the upper and lower
buttons together until 'En2' is displayed.
5. Release the buttons. The current state, 'on' or 'oFF',
will be displayed. If 'on' is displayed, then control
loop 2 is enabled.
6. If 'oFF' is displayed, press either the upper or lower
button until 'on' is displayed. This setting is effective
immediately. After 30 seconds of button inactivity,
the control display will revert back to its default
temperature, and the 'En2' selection is stored in
nonvolatile memory.
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To set the temperature setpoint and differential for
control loop 2, see sections 6.6.5 and 6.6.6 in the
installation manual. Default settings and ranges are
shown in Tables 10 and 11 of the manual.
To ensure that the temperature setpoint of the
Pennant (CH1) does not interfere with the call for heat
from the external setpoint, set the Pennant setpoint 'CH1'
at least 10°F higher than the control loop 2 setpoint,
'CH2'.
If control loop 2 (thermistor 2) is not needed, make
sure that control loop 2 is not enabled in the menu, as
described above. (Note that the thermistor must still be
connected to Pennant terminals 9 and 10, or the
controller will see a "sensor open" error .)
Further, if control loop 2 is not needed to call the
Pennant for heat, the auxiliary contacts, terminals 11 and
12, can be used as dry contacts to activate a pump, or
other device, based on the temperature setpoint and
differential associated with thermistor 2.
If there are questions about controlling the Pennant,
please contact Laars Applications Engineering at 603-
335-6300.