Bosch 520PN Applications Manual page 72

30 | Installation instructions
70
60
50
40
30
20
10
0
0.0
Fig. 40 Pressure drop curve
22
21
20
Fig. 41 Space heating diagram
[1] Hot water outlet
[2] Cold water inlet
[3] Pressure relief valve
[4] Gas supply
[5] Shut off gas valve
[6] Thermal expansion tank (as required)
[7] Atmospheric vacuum breaker
[8] Cold inlet
[9] Check valve
[10] Pump
[11] Thermostatic mixing valve
6 720 644 887 (2013/02)
C1210ES\ESC
1.0 2.0
18
13
17
T
12
15
16
5
14
5
19
3.0
Flow (GPM)
8
11
9
9 6
10
9
[12] Thermometer (optional)
[13] DHW outlet
[14] Water to water heat exchanger
[15] Backflow preventer
[16] Automatic water feed
[17] Thermostat
[18] Space heating zone
[19] Zone controller
[20] Space heating pump
[21] Expansion tank
[22] Pressure relief valve
4.0 5.0
6720644887-01.1V
7
1 2
3
5 4
6720644887-02.1V
C 1210 ES/ESC