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“Press”
button to access the following parameters:
Factory Setting Range / Choices Parameter and Description
Any Demand
Never,
Any Demand,
Central Heat,
No Priority,
Central Heat,
Optional Priority
System Pump run pump for:
Activates the system pump output according to selected function.
Never: Pump is disabled and not shown on status screen.
Any Demand: Pump Runs during any call for heat.
Central Heat, No Priority: Pump Runs during central heat and frost protection call for
heat. Pump does not start for a DHW call for heat and
continues to run during Domestic Hot Water Priority.
Central heat, Optional
Priority: Pump Runs during central heat and frost protection call for
heat. Pump does not start for a DHW call for heat and will be
forced off if there is a DHW call for heat and Domestic Hot
Water Priority is active.
Any Demand
Any Demand,
Central Heat, off
DHW demand
Boiler Pump run pump for:
Activates the boiler pump output according to selected function.
Any Demand: Pump Runs during any call for heat.
Central Heat, off DHW
demand: Make sure indirect water heater and DHW circulator are sized
to maintain ow through boiler within limits shown in Table 12.
Pump Runs during central heat and frost protection
call for heat. Pump does not start for a DHW call for
heat and will be forced off if there is a DHW call for
heat and Domestic Hot Water Priority is active.
Primary
Loop Pipe
IWH
Never,
Primary Loop
Piped IWH,
Boiler Piped IWH
Domestic Pump run pump for:
Activates the Domestic pump output according to selected function.
Never: Pump is disabled and not shown on status screen.
Primary Loop Piped IWH: Pump Runs during domestic hot water call for
heat. Domestic Hot Water Priority enable/disable
does not affect pump operation.
Boiler Piped IWH: Make sure indirect water heater and DHW
circulator are sized to maintain ow through boiler
within limits shown in Table 12.
Pump Runs during domestic hot water call for heat. Pump is
forced off during a central heat call for heat when Domestic
Hot Water Priority “disabled” is selected and when Domestic
Hot Water Priority “enable” has been selected and the DHW
call for heat has remained on for longer than 1 hour (priority
protection time).
Explanation:
This piping arrangement only
services central heat. When
there is any demand both boiler
and system pumps turn on.
Parameter Selections:
System Pump= “any demand”
Boiler Pump = “any demand”
DHW Pump = “never”
Example Pump Parameter selections:
Single boiler with no Indirect Water Heater
X. Operation F. Changing Adjustable Parameters (continued)
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