93
X. Operation G. Changing Adjustable Parameters (continued)
“Press”
button to access the following parameters:
Factory Setting Range / Choices Parameter and Description
Central Heat,
Optional Priority
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: 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: 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 de-
mand 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
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