CONTROL METHODS HeatNet Control V3
Page 28
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.
Jumper JPS1
Note: 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) PIDs.
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