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XII. Operation
F. Changing Adjustable Parameters (continued)
Expected Heat Rate Adjustment Screens (HeatMatch Software)
The Control is shipped with defaults that will provide improved operation. Adjustment is only required to optimize
setup.
The expected heat rate adjustment is used to better match boiler output to the home heating needs. After receiving
a "call for heat" the Control first uses the expected heat rate value to set a maximum heat rate. The maximum heat
rate is the highest heat rate that the boiler can fire to at that moment. The maximum heat rate is the summation of
the expected heat rates for the active (turned on) zones. After establishing the maximum heat rate the Control then
measures water temperature and fires the boiler only as hard as required for the heat demand.
Example "call for heat"
durations for a four
zone house.
Maximum heat rate
limits firing rate and
prevents the Control
from firing to 100% in
response to a smaller
zone demands.
Figure 12.12: Expected Heat Rate Adjustment (with Zone Control Connected)
107672-03 - 5/18
Figure 12.11: Four Zone House (with Zone Control Connected)
Maximum Heat Rate:
Automatically adjusted
by the Control based
on the size and
number of zones
calling for heat.
Actual Heat Rate:
Boiler is free to
modulate based
on temperature
from minimum to
maximum heat rate.
119
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