54
R2KA 34 /20 - RAD - ING - Inst.Manual - 2002.1_CSA
2. MAINTENANCE
SUPPOR
T CENTER
2.2.10. INTERNAL PIPING SCHEMATIC
KEY
R. CENTRAL HEATING RETURN
C. DOMESTIC HOT WATER OUTLET
G. GAS INLET
SC. CONDENSATE DRAIN
F. COLD WATER INLET
A. CENTRAL HEATING SUPPLY
1. EXHAUST SAFETY HIGH LIMIT SWITCH
2. INTEGRATED HEAT EXCHANGER
3. BURNER UNIT
4. COMBUSTION BLOWER
5. THERMAL EXPANSION TANK
6. AIR ELIMINATOR
7. CIRCULATOR
8. PRESSURE RELEIF VALVE 30 psi (2 bar)
9. SYSTEM DRAINING TAP
10. DOMESTIC TEMPERATURE PROBE
11. CENTRAL HEATING TEMPERATURE PROBE
12. WATER TEMPERATURE HIGH LIMIT SWITCH
13. AIR SUCTION TUBE
14. PROPORTIONAL VENTURI
15. GAS VALVE
16. BY-PASS
17. WATER PRESSURE SWITCH
18. DIVERTER VALVE
19. FLOW SWITCH
20. CONDENSATE COLLECTION SIPHON
21. SYSTEM FILLING TAP
22. ANODE
23. INDIRECT TANK
24. PRESSURE RELEIF VALVE 150 psi (10.3 bar)
25. THERMAL EXPANSION TANK D.H.W.
26. TANK DRAINING TAP
27. CHECK VALVE
R
G
F
C
A
SC
2
4
5
6
8
6
13
14
15
22
23
6
24
1
7
9
11
12
17
18
19
20
21
25
26
3
16
27
10
MAINTENANCE
fig. 33
