Burnham K2WT Residential Installation, Operating And Service Instructions page 123

XII. Operation
F. Changing Adjustable Parameters (continued)
Example Pump Parameter selections (continued):
Multiple boilers IWH Piped to Primary, Optional Domestic Hot Water Priority
Explanation:
This piping arrangement permits the system pump to run or not run when there is a domestic hot water call for heat. Domestic hot water
priority is optional. It is permissible for the domestic and system pumps to run at the same time. The boiler pump must run for every call for
heat.
Multiple Boilers, IWH piped to primary, system pump required to run for any call for heat
Explanation:
This piping arrangement requires the system pump to be running for any calls for heat. Also the boiler pump must run for any call for heat.
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Sequencer Master
Wiring locations:
Thermostat
DHW call for heat
System pump
DHW pump
Boiler Pump
Sequencer Master Parameter Selections:
Sequencer Master
Indirect Water
"Primary Piped"
Heater
Pump Parameter Selections:
System Pump =
Optional Priority
Boiler Pump =
DHW Pump =
Sequencer Master
Wiring locations:
Thermostat
DHW call for heat
System pump
DHW pump
Boiler Pump
Sequencer Master Parameter Selections:
Sequencer Master
Indirect Water
"Primary Piped"
Heater
Pump Parameter Selections:
System Pump = Any demand
Boiler Pump = Any demand
Primary Loop
DHW Pump =
Piped IWH
Boiler 2
(Boiler 1)
X
X
X
X
X X
Enabled
Central Heat,
Never
Any
Any demand
demand
Primary Loop
Never
Piped IWH
Boiler 2
(Boiler 1)
X
X
X
X
X X
Enabled
Never
Any demand
Never
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