Burnham Apex APX399 Installation, Operating And Service Instructions page 93

X. Operation
G. Changing Adjustable Parameters (continued)
Pump Setup
"Press" button to access the following parameters:
Factory Setting
Central Heat,
Central heat, No Priority,
Optional Priority
Central Heat, Optional
Any Demand
Central heat, off DHW
Primary
Loop Pipe Primary Loop Piped IWH,
iWH
Example Pump Parameter selections:
Single boiler with no Indirect Water Heater
range / Choices
System Pump run pump for:
Activates the system pump output according to selected function.
Never:
Any Demand:
Central Heat, No Priority:
Never,
Any Demand,
Central heat, Optional
Priority
Priority:
Boiler Pump run pump for:
Activates the boiler pump output according to selected function.
Any Demand:
Central heat, off DHW
Any Demand,
demand:
demand
Domestic Pump run pump for:
Activates the Domestic pump output according to selected function.
Never:
Primary Loop Piped IWH: Pump Runs during domestic hot water call for
Never,
Boiler Piped IWH:
Boiler Piped IWH
Parameter and Description
Pump is disabled and not shown on status screen.
Pump Runs during any call for heat.
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.
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.
Pump Runs during any call for heat.
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.
Pump is disabled and not shown on status screen.
heat. Domestic Hot Water Priority enable/disable
does not affect pump operation.
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).
Parameter Selections:
System Pump= "any demand"
Boiler Pump = "any demand"
DHW Pump = "never"
Explanation:
This piping arrangement only services
central heat. When there is any de-
mand both boiler and system pumps
turn on.
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