HVACopediaNavien · Boiler
△T Limit - No. of Times EMS Data counter 8
What the display is showing
History counter: number of times supply/return temperature difference limit control has acted. Read-only information in the EMS Data list (item 8).
Applies to: NHB-055H, NHB-080H, NHB-110H, NHB-150H
What to do
- Menu > 5. EMS Data > scroll to the item.
Settings for these units
Installation clearances (indoor) · Navien NHB-H
| Side | Minimum clearance |
|---|---|
| Top | 9 in (229 mm) |
| Back | 0.5 in (13 mm) |
| Front | 4 in (100 mm) |
| Sides | 3 in (76 mm) |
| Bottom | 12 in (300 mm) |
| Vent to combustibles | 0 in |
Bracket gives 5/8 in (16 mm) from the wall; studs at 16 in on centre.
Common vent installs: 36 in above the top and 24 in in front are recommended for service.
Models that show this code
4 models in Navien NHB-H
Other codes on the same units
- System pressure System pressure display
- Tank Sensor Temp Status Information item 13 - Tank Sensor Temp
- Water Press Status Information item 14 - Water Press
- Zone V/V 1 Status Input/Output Status item 9 - Zone V/V 1 Status
- Zone V/V 2 Status Input/Output Status item 10 - Zone V/V 2 Status
- Zone V/V 3 Status Input/Output Status item 11 - Zone V/V 3 Status
- system/Zone3 Pump Status Input/Output Status item 8 - system/Zone3 Pump Status
- △T High - No. of Times EMS Data counter 10
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Source: Navien NHB-H Installation and Operation Manual, 11.11, p.108-109. Summarized in our own words; check the original manual for your model.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.