Navien NHB-055 Installation & Operation Manual page 82

Setting the Supply Absolute MIN Temperature
Display
S R O/R psi
This menu can be used to change the minimum supply
temperature range in Supply Control mode. When Custom mode is
configured in Outdoor Reset Control mode, changes to the supply
temperature are based on the supply absolute MIN temperature
range.
Supply Absolute MIN Temperature Range
Range
77°F (25°C) –
[MAX set point - 36°F (20°C)]
Setting the Return Absolute MAX Temperature
Display
S psi
R O/R
This menu can be used to change the maximum return
temperature range in Return Control mode. When Custom mode is
configured in Outdoor Reset Control mode, changes to the return
temperature are based on the return absolute MAX temperature
range.
Return Absolute MAX Temperature Range
Range
[MIN set point + 18°F (10°C)] –
158°F (70°C)
82 Operating the Boiler
Description
Supply absolute Min set point (°F)
Remarks
Default: 104°F (40°C)
Description
Return absolute MAX set point (°F)
Remarks
Default: 149°F (65°C)
Setting the Return Absolute MIN Temperature
Display
Return absolute MIN set point (°F)
S R O/R psi
This menu can be used to change the minimum return
temperature range in Return Control mode. When Custom mode is
configured in Outdoor Reset Control mode, changes to the return
temperature are based on the return absolute MIN temperature
range.
Return Absolute MIN Temperature Range
Range
68°F (20°C) –
[MAX set point - 18°F (10°C)]
Setting the Low Water Pressure Limit
Display
Low water pressure limit
S psi
R O/R
This menu can be used to monitor water pressure limit and water
volume levels. If the water pressure drops below the limit pressure,
an E302 error occurs. The boiler must be manually reset to clear
this error.
Default: 6 psi
Range: 4–17 psi
Setting the Initial Start-up Number
Display
Initial start-up number
S R O/R psi
This menu may be used to set the number of boiler initially
activated during stand-by periods.
Default: 0 (auto setting: 1)
Range: 0–16
Description
Remarks
Default: 86°F (30°C)
Description
Description