External Staging Control Wiring - Laars Pennant PNCH Installation And Operation Instructions Manual

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5.3 External Staging Control Wiring

WARNING
Improper field wiring may result in fire or explosion
which can cause property damage, severe injury, or
death. Make only wiring connections which are in
accordance with the Installation and Operation
manual.
AVERTISSEMENT
Un câblage incorrect lors de l'installation peut causer
un incendie ou une explosion pouvant entraîner des
dommages matériels, de graves blessures ou la
mort. Ne faire seulement que les connexions
conformes au Manuel d'installation et d'exploitation.
The wiring methods in this section must be used
to connect an external staging control, such as a
multiple boiler control, building automation system,
energy management system, etc.) Other wiring
methods may be unsafe.
Figure 15 shows how to wire the external
controller to the Pennant's field wiring panel, which is
located on the right side of the Pennant.
Most of the time, the number of stages from the
external control will match the number of stages on the
Pennant. However, in some instances, the controller
will not have enough staging capability to work with
all of the stages on a Pennant unit (for instance, using
an 8-stage external control with four 4-stage Pennant
units.) In these instances, it is very important to
follow the instructions in this section Figure 15 shows
how to combine stages on the Pennant for those
instances when the external controller cannot control
all the stages available.
NOTE: The only time Pennant stages should be
jumpered is when the Pennant has an external control,
and the Pennant is used in Mode 6. In all other modes,
when the Pennant controls its stages, the terminals
shown in Figure 15 must NOT be jumpered.
LAARS Heating Systems