System Features
©Aqua-Hot®
250-D03 Diesel Series Service Manual
REV 220302
p. 7
Component Cut-Away
9
10
6
5
4
2
1
17
7
8
11
Figure 4
12
13
14
15
18
3
Figure 3
1. Access Cover Screw
2. Drain Valve
3. Zone Circulation Pump
4. 3-Way Valve
5. Diesel Burner Controller
6. Tempering Valve
7. Diesel Burner Assembly
8. Interlock Switch
9. Domestic Cold Water Inlet
10. Domestic Hot Water Outlet
11. 120V AC Connection
12. Diesel Fuel Return Port
13. Diesel Fuel Supply Port
14. Expansion Tank Connection
15. Heating Zone Return Port
16. Heating Zone Outlet Port
17. Boiler Tank
18. Domestic Hot-Water Coil
19. Aqua-Hot Controller
16
250-D03
NOTE:
The side panel in the view below has been
made transparent to aid in the explanation of the
heater. DO NOT remove the panels. Doing so risks
irreparable damage to the Aqua-Hot. Only remove the
service panel for service.
19
