Ravelli HR EVO 290 Manuel D'installation page 67

Boiler hydraulic diagrams
DHW (CD) is a technical water not suitable for direct DHW use.
A. DELIVERY Heating male 1"
B. RETURN Heating male 1"
C. DHW DELIVERY male 3/4"
D. DHW RETURN male 3/4"
E. Reintegration (max 2 bar)
F. Safety Exhaust (3 bar)
G. Emptying the plant
1. Boiler
2. Circulating pump
3. Circuit/heating chamber air vent
4. Pressure relief valve P max 3 bar
5. Expansion vessel (preload 1 bar)
HR EVO 290 - 350 - 390
4
3
1
1
5
use and maintenance manual
2
6
4
P
6. DHW pump
7. Automatic thermostatic valve
8. Non-return valve
9. Shutoff valve/cock
10. Control system
11. Drain cock
12. Plate heat exchanger for DHW
13. Pressure relief valve P max 6 bar
T Water temperature sensor
P Circuit pressure sensor
F Flow switch
Rev.1 16/03/2018
Pag.67
9
9
F
8 9
7
8 9
8 9
G
11
ENG
A
C
B
D
E