Weil-McLain Series 2 User's Information Manual page 10

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GAS FIRED WATER BOILER SERIES
Ultra boiler components . . .
1. Cast aluminum heat exchanger
2. Exchanger access cover
3. Blower
4. Gas valve
4a. Manual gas valve
4b. Gas valve sensing line
5. Venturi
5a. Air inlet silencer
6. Flue gas sensor
7. Outlet water temperature sensor
8. Return water temperature sensor
9. Temperature and pressure gauge
10. Electronic display & buttons
10a. On/off Power switch
11. Flue pipe adapter
12. Burner
13. Water outlet pipe (system supply)
14. Water return pipe (system return)
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2 — User's Information Manual
15. Gas connection pipe
16.
16a. Top front cover
17. Transformer
18. Air intake adapter
19. Electrical entrance cover plate
19a. Low voltage terminal strip
19b. Line voltage terminal strip
20. Boiler drain valve
21. Line voltage receptacle
22. P/T gauge temperature sensor well
23. Condensate drain connection
(½" PVC tee)
23a. Condensate trap
24. Front door
24a. Thumb screws
25. Ignitor electrode
26. Flame inspection window
27. Data port
PhD Control Module
Part number 550-100-027/0404