CONTROL METHODS
HeatNet Control V3 3.x
Page 35
Domestic Hot Water Methods
Domestic Hot Water control is supported using (6) methods.
When using the Domestic Hot Water methods, the wire
jumper, JPS1 on each control board providing Domestic Hot
Water, must be cut to limit the boiler’s maximum output
temperature to 200F. Refer to
Figure 41
for control input and
Figure 49
for output locations.
Figure 27
Most of these methods use a separate PID
control for the DHW. This means that the
MASTER boiler can be used to individually control its
own DHW tank and provide space heating functionality at
the same time.
A
MASTER TYPE
is required when using DHW. Its setting
is located under the
DISTRIBUTED CONTROL
menu.
Any
time its setting is changed, a power cycle is required.
The
menu choices are:
AUTO
: will handle normal heating only applications. It
may also be used when individual boilers have tanks
connected and are controlled with the
DHW BOILER
?
set to
LOCAL
.
DHW
: is for
DHW
applications without space heating.
Combination
: Will allow combination Space and DHW
heating control of boilers by the MASTER.
The OR OVR input now functions in many of the methods
as a DHW Heat Demand input (except
DHW
Heating Only
method), but still retains the original OR OVR functionality in
AUTO
, if the DHW menus are not used (
BOILER MODE
?
OFF
). If the DISABLE TO CHANGE message appears,
remember to remove the any call for heat including the OR
OVR input.
When the MASTER TYPE is set to
Combination
the
MODULAR BOILER menu will contain (2) separate menu
tabs for controlling the ADD BOILER DELAY, SHED
BOILER DELAY, MODULATE DELAY, and the MOD
MAX for the SPACE HEATING and DHW HEATING. This
allows the independent control of boilers by the MASTER for
each of the (2) adjustable PIDs (Adjustable from 2-10).