Configuring Water Heater Functions; Pump Exercise Operation Time (P04) - Navien NPE-180A Installation Manual

5.4 Configuring Water Heater Functions

This section describes the water heater functions and provides the information
required to configure the parameters for the desired operation.

5.4.1 Pump Exercise Operation Time (P04)

The pump exercise function is designed to prevent the stagnation of hot water in the
heating system.
The pump exercise function operates every 24 hours. Pump exercise operation time
function sets the desired pump exercise operation time differently depending on the
plumbing as well as environmental conditions.
With this option activated, the NPE-180A/240A water heater monitors the pump
operation. When it detects that a pump has not been used for a specific period, it
runs the pump for a set duration. If the flow rate is not detected while the pump is
operating, the 'E438' error message is displayed.
To change the pump exercise operation time:
1. In the Parameter information time mode, use the Up (+) or Down (-) buttons to
select P.04. Then, press the Info button to enter the Pump exercise operation
time mode.
2. In the Pump exercise operation time mode, use the Up (+) or Down (-) buttons to
change the value and press the Info button to set to the desired mode.
Range Description
Sets the exercise operation time
1–240(sec)
(default: 30 sec)
Note
 If no buttons are pressed for 10 seconds or if the Info button is pressed, the
current parameter value will be saved automatically.
 To return to the <PARAMETER INFORMATION MENU MODE>, press the [Reset]
button once.
 If no buttons are pressed for five minutes, the display will automatically return to
the <PARAMETER INFORMATION MENU MODE>.
 While the pump is excising, the burner will not fire.
Configuring the NPE-180A/240A Water Heater
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