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Mode 3 is intended for domestic water heating.
The set-point for inlet water control is pre-set to
140°F and the auto re-set limit is set to 200°F.
The inlet set-point can be adjusted, however the
limit is fixed. In addition to the auto reset limit the
factory installs a manual re-set limit set to 210°F.
The control turns on the appliance pump and
stages the appliance to maintain set-point target
temperature at the appliance inlet temperature.
An internal demand is generated from the DHW
sensor which could be placed in the storage
tank while the external heat demand is
permanently wired or through a timer. Once the
DHW tank is satisfied (internal demand is
removed), the control turns off the appliance and
operates the appliance pump based on the
purge feature.
Mode 4 is intended for hydronic heating. The
set-point for inlet water control is pre-set to
180°F and the auto re-set limit is set to 230°F.
The inlet set-point can be adjusted, however the
limit is fixed. In addition to the auto reset limit the
factory installs a manual re-set limit set to 250°F.
The control turns on the appliance pump and
stages the appliance to maintain outdoor reset
target temperature at the appliance inlet
temperature whenever an external heat demand
is present. Once the external heat demand is
removed, the control turns off the appliance and
operates the appliance pump based on the
purge feature
.
Mode 5 is intended for hydronic heating. The
set-point for inlet water control is pre-set to
180°F and the auto re-set limit is set to 230°F.
The inlet set-point can be adjusted, however the
limit is fixed. In addition to the auto reset limit the
factory installs a manual re-set limit set to 250°F.
The control turns on the appliance pump and
stages the appliance to maintain outdoor reset
target temperature at the system temperature
whenever an external heat demand is present.
Once the last appliance stage turns off and the
heat demand is still present, the control then
operates the appliance pump based on the
purge feature. In this case, it is imperative that
the system pump operates continuously in order
to provide constant circulation past the system
sensor. The appliance pump then turns back on
with the first stage of the appliance. If the heat
demand is removed, the appliance is turned off
and the control operates the appliance pump
based
on
Mode 6 is intended for multiple appliance
application and all stages are closed at all times.
In essence there is no operator at the appliance.
A removable jumper is provided in the electrical
enclosure across the contacts to be used for
connection to the remote operator. The fixed
auto re-set limit is set to 230°F. In addition to the
auto reset limit the factory installs a manual re-
set limit set to 250°F. The control provides pump
operation. Staging operation is provided by an
external sequencing control. Heat demand
provided via external analog input signal from
20
the
purge
feature.
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