Technical Data; General Specifications - Navien NCB-24LSWE Service Manual

3. Technical Data

3.1 General Specifications

The table below lists the boiler's general specifications.
Specification
Heating capacity (max/min)
DHW heat capacity (max/min)
Heating output (max/min) at 80/60°C
DHW output (max/min)
Condensing heating output (max/min) at 50/30°C
Full output load efficiency (max/min), at 80/60°C
Full output load efficiency (max/min), at 50/30°C
(condensation)
Partial load (30%) efficiency, at 30°C return
temperature
Heat Loss via the casing with burner switched on
Heat Loss via the chimney with burner switched on
Seasonal efficiency rate (SEDBUK rating)
NOx class
Category
Type
Heating output adjustment
Type of heating installation
Maximum heating pressure
Maximum heating temperature
Adjustable heating temperature range
Expansion vessel volume
Expansion vessel pre-load
Minimum DHW pressure
Minimum DHW flow
Maximum DHW pressure
Adjustable DHW temperature range
Specific flow (ΔT=25°C)
Specific flow (ΔT=30°C)
Version 1.0
NCB- NCB-
Unit
24LSWE 28LSWE
kW 20.0/4.2 24.0/4.2
kW 24.0/4.2 28.0/4.2
kW 19.5/4.0 23.3/4.2
kW 20.0/4.0 24.0/4.0
kW 21.4/4.5 25.5/4.5
% 97.7/96.4 97.2/96.4
% 106.9/107.8 106.3/107.8
% 108.3 108.3
% 0.1
% 1.6
-
-
-
- Heating and instantaneous hot water production
- Adjustable over entire max/min output range
-
bar
°C
°C
l
bar
bar 1.0 1.2
l/min
bar
°C
l/min 13.8 16.1
l/min 11.5 13.4
NCB-
34LSWE
29.0/5.1
34.0/5.1
28.4/4.9
34.0/5.0
31.1/5.5
97.9/96.4
107.3/107.9 106.6/107.9
108.6
0.1 0.1
1.8 1.5
A
5
II2H3P
Closed circuit
2.5
90
40-90
6. 0
1
1.4
2.0
10
30–65
19.5
16.2
NCB Service Manual 17
NCB-
40LSWE
34.0/4.0
40.0/4.0
33.2/3.8
40.0/4.0
36.2/4.3
97.5/95.8
108.8
0.1
1.9
1.4
22.9
19.1