Thermal Solutions APEX APX425C Installation, Operating And Service Instructions page 91

10
Operation
(continued)
6. Example Pump Parameter Selections
Single boiler, No Indirect Water Heater
Single Boiler, Primary Piped Indirect Water Heater, Optional DHW Priority
106308-05 - 3/23
APEX Installation, Operating, & Service Instructions
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.
Parameter Selections:
System Pump= "Central Heat ,
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.
Optional Priority"
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