Thermal Solutions APEX APX425C - 10 Operation (continued); Example Pump Parameter Selections for Single Boiler Configurations

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APEX Installation, Operating, & Service Instructions APEX Installation, Operating, & Service Instructions
6. Example Pump Parameter Selections
Single boiler, No Indirect Water Heater
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.
Single Boiler, Primary Piped Indirect Water Heater, Optional DHW Priority
Parameter Selections:
System Pump= “any demand”
Boiler Pump = “any demand”
DHW Modulation Sensor = “DHW Sensor”
DHW Pump = “never”
Explanation:
This piping arrangement only
services central heat. When there is
any demand both boiler and system
pumps turn on.
10 Operation (continued)