17 Return temperature sensor
18 Heat exchanger temperature sensor
19 Flow temperature sensor
20 Flue gas temperature sensor
21 Valve proving system (VPS)
22 Gas pressure switch (GPS)
23 Fan PWM signal
13.3 Hydraulic resistance
Tab.134 Hydraulic resistance
Hydraulic resistance in mbar
Heat exchanger size
∆T 10
°C
∆T 11
°C
∆T 12
°C
∆T 13
°C
∆T 14
°C
∆T 15
°C
∆T 16
°C
∆T 17
°C
∆T 18
°C
∆T 19
°C
∆T 20
°C
5 sections:
C 340 280
C 640 560
452
374
314
267
231
201
177
156
140
125
113
6 sections:
C 340 350
C 640 700
440
364
306
260
224
196
172
152
136
122
110
7 sections:
C 340 430
C 640 860
480
397
333
284
245
213
188
166
148
133
120
8 sections:
C 340 500
C 640 1000
440
364
306
260
224
196
172
152
136
122
110
9 sections:
C 340 570
C 640 1140
500
413
347
296
255
222
195
173
154
139
125
10 sections:
C 340 650
C 640 1300
520
430
361
308
265
231
203
180
160
144
130
13.4 C 340 technical data
Tab.135 General
C 340
280
350
430
500
570
650
Number of sections
5
6
7
8
9
10
Nominal output
P
n
80/60 °C
kW
min
51.1
260.7
64.8
326.7
78.6
394.8
91.5
461.0
105.5
530.4
118.7
600.9
Nominal output
P
nc
70/50 °C
kW
262.0
328.0
396.4
462.4
532.0
602.1
Nominal output
P
nc
50/30 °C
kW
278.8
350.3
424.5
497.1
573.5
651.5
Nominal input
Q
nh
(
H
i
)
kW
min
54
266
68
333
82
402
95
469
109
539
122
610
Nominal input
Q
nh
(
H
s
)
kW
min
60
295.6
75.6
370.0
91.1
446.7
105.6
521.1
121.1
598.9
135.6
677.8
Full load central heating ef
ficiency
P
n
(
H
i
) 80/60 °C
%
98.0
98.1
98.2
98.3
98.4
98.5
Full load central heating ef
ficiency
P
n
(
H
i
) 70/50 °C
%
98.5
98.5
98.6
98.6
98.7
98.7
Full load central heating ef
ficiency
H
i
50/30 °C
%
104.8
105.2
105.6
106.0
106.4
106.8
Min load central heating ef
ficiency
H
i
Return temper
ature 60 °C
%
94.7
95.3
95.8
96.3
96.8
97.3
Part load central heating ef
ficiency
P
n
(
H
i
) Return
temperature
30 °C
%
109.2
109.0
108.8
108.6
108.3
108.1
Full load central heating ef
ficiency
P
n
(
H
s
) 80/60 °C
%
88.2
88.3
88.4
88.5
88.6
88.7
13 Technical specifications
178
C 340 / C 640
7762666 - v.02 - 29092020
