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DIAGRAMATIC LAYOUT
1 . HEAT EXCHANGER
2. BURNERS
3. WATER FLOW RESTRICTOR
4. FLOW IGNITION DEVICE (LPG ONLY)
5. THERMOSTATIC GAS FLOW MODULATOR
6. GAS FLOW VALVE (THERMOSTATIC CON-
TROLLED)
7. GAS FLOW VALVE (WATER FLOW CONTROLLED)
8. COLD WATER INLET AND BUILT IN FLOW
CONTROL (REMOVABLE)
9. PILOT LIGHT
10. PILOT LIGHT ORIFICE
11. PILOT LIGHT GAS FILTER
12. THERMOCOUPLE
13. ELECTROMAGNET GAS FLOW SHUT-OFF
VALVE
14. MANUAL GAS FLOW SHUT-OFF VALVE
15. PILOT STARTER KNOB
16. THERMOSTATIC MODULATOR
ADJUSTING SCREW
23
17.
WATER TEMPERATURE PROBE (THERMOSTAT
SENSOR)
18. GAS LINE PRESSURE TEST NIPPLE
19. OVERHEAT SENSOR SWITCH
20. THERMOSTATIC WATER TEMPERATURE
SELECTOR
21. WATER FILTER SCREEN
22. GAS PRESSURE TESTING NIPPLE
23. VENTURI PISTON
24. GAS REGULATOR
25. PUSH ROD ASSEMBLY
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