Burnham K2WTC - Page 114

114
107774-01 - 9/17
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rst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re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restheboileronly
as hard as required for the heat demand.
Sage Zone Panel Expected Heat Rate Adjustment Screens (HeatMatch Software)
Example “call for heat”
durations for a four zone
house.
Maximum heat rate
limitsringrateand
prevents the Control
fromringto100%in
response to a smaller
zone demands.
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.
Figure 13.11: Four Zone House (with Sage Zone Control Connected)
XIII. Operation F. Changing Adjustable Parameters (continued)
Figure 13.12: Expected Heat Rate Adjustment (with Sage Zone Control Connected)
Note
This feature requires Zone Control
to be connected. Refer to Electrical
section for Zone Control connection
information.
The sum of Zone Expected Heat Rates
is used to calculate the active maximum
modulation rate
Maximum modulation numbers are
shown in both RPM and kbtu/hr to
allow for easier understanding of boiler
heat rate.