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Parameter Selections:
System Pump = “Central Heat,
Optional Priority”
Boiler Pump = “any demand”
DHW Pump = “Primary Loop Piped IWH”
DHW Priority Enable is optional
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 with Boiler Piped IWH, System and DHW Wired to Master
Example Pump Parameter selections (continued):
i. Operation
F. Changing Adjustable Parameters (continued)
Single boiler Indirect Water Heater (IWH)Piped to Primary, Optional Domestic Hot Water Priority.
Sequencer
Master
(Boiler 1)
Boiler 2
Wiring locations:
Thermostat
X
DHW call for heat
X
System pump
X
DHW pump
X
Boiler Pump
X
X
Sequencer Master Parameter Selections:
Sequencer Master
Enabled
Indirect Water
Heater
“Boiler Piped”
Pump Parameter Selections:
System Pump =
Central Heat,
No Priority
Never
Boiler Pump =
Any demand
Any
demand
DHW Pump =
“Primary Piped”
Never
Explanation:
When call for Domestic Hot Water is received the DHW pump is turned on and the boiler pump is turned on. However, the system
pumps may run to satisfy a central heat demand that is being satisfied by a different slave. The central heat demand is ignored by
Slave 1 until the domestic hot water demand is ended.