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10
Operation
(continued)
5. Pump Parameters
Select
to access the following parameters.
System Pump
Activates system pump output according to selected function:
Never:
Pump is disabled and not shown on status screen.
Any Demand:
Pump runs for any demand.
Central Heat, No Priority: Pump runs during central heat and frost protection
demand. Pump does not start for a DHW demand and
continues to run during DHW Priority.
Central Heat, Optional
Priority:
Pump Runs during central heat and frost protection
demand. Pump does not start for a DHW demand and will
be forced off if there is a DHW demand and DHW Priority
is active.
Boiler Pump
Activates boiler pump and combustion air damper (if using room air) output according to
selected function:
Any Demand:
Pump runs/damper opens for any demand.
Central Heat, off DHW
Demand:
Make sure indirect water heater and DHW circulator are
sized to maintain flow through boiler within limits shown in
Table 6-3. Pump runs during central heat and frost
protection call for heat and will be forced off if there is a
DHW call for heat and DHW priority is active.
Header Sensor/
Combustion Air Damper:
Pump runs when boiler is firing to satisfy any call for heat.
Used when header sensor is enabled to prevent
unnecessary operation of boiler pump. Also used when
combustion air damper is wired to Boiler Pump output.
NOTE: Header Sensor must be used when combustion air
DHW Pump
Activates domestic hot water pump output according to selected function:
Never:
Pump is disabled and not shown on status screen.
Primary Loop Piped IWH: Pump runs during DHW demand. DHW Priority enable/
disable does not affect pump operation.
Boiler Piped IWH:
Make sure indirect water heater and DHW circulator are
sized to maintain flow through boiler within limits shown in
Table 6-3. Pump runs during DHW demand. Pump is
forced off during central heat demand when 1) DHW
Priority is disabled or 2) DHW priority is enabled and
DHW demand has remained on for longer than Priority
Time.
Overrun Time: System Pump
Time that pump runs after demand is satisfied. Used to dissipate heat within the system.
Overrun Time: DHW Pump
Time that pump runs after demand is satisfied. Used to dissipate heat within the system.
Overrun Time: Boiler Pump/Combustion Air Damper
Time that pump runs after demand is satisfied. Used to dissipate heat within the system.
Pump Exercise Interval
The number of days the pump is inactive before the pump will be activated for the Pump
Exercise Time.
Pump Exercise Time
The amount of time the pump runs for exercise. This feature helps prevent pump seizing due to
inactivity periods.
90
Parameter and Description
damper output is required.
APEX
Installation, Operating, & Service Instructions
Factory
Setting
Any Demand
Any Demand
Primary
Loop Piped
IWH
0 min.
0 min.
30 seconds
7 days
20 seconds
Range / Choices
Never
Any Demand
Central Heat, No Priority
Central Heat, Optional
Priority
Fresh Air Damper
Never
Any Demand
Central Heat, off DHW
demand,
Header Sensor Demand/
Combustion Air Damper
Never
Primary Loop Piped IWH
Boiler Piped IWH
Fresh Air Damper
0 to 60 min.
0 to 60 min.
0 to 60 min.
0 to 40 days
0 to 10 min.
106308-05 - 3/23
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