1. Components key:
2. KM Contactor
3. KM1 Contactor
4. KM2 Contactor (if present)
5. RT Thermal relay
6. RT1 Thermal relay
7. RT2 Thermal relay (if present)
8. M Fan motor
9. M1 Fan motor
10. M2 Fan motor (if present)
11. FAN thermostat
12. LM Manual reset safety
thermostat
13. TR Automatic reset safety
thermostat
14. F1 Fuse
15. BM Single-stage burner terminal
block
16. BP1 Double-stage burner
terminal block
17. BP2 Double-stage burner
terminal block
18. SC Controller terminal block
19. RS Stage switch relay
20. RB Burner relay
Figure 19.
Wiring diagram 8000003938
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