TM 10-3510-226-23
0003 00
THEORY OF OPERATION-CONTINUED
Additional components contained within the PLC enclosure include:
Contactors for the boiler (Figure 10, Item 4), P-1 Pump (Figure 10, Item 5), P-3 pump (Figure 10, Item
6), and P-4 pump (Figure 10, Item 7);
Overload Relays for the P-1 Pump (Figure 10, Item 8), P-3 pump (Figure 10, Item 9), and P-4 pump
(Figure 10, Item 10);
Relays for the dryer exhaust fans (Figure 10, Item 11), blackout lights (Figure 10, Item 12), burner power
alarm (Figure 10, Item 13), low water level alarm (Figure 10, Item 14), interior lights (Figure 10, Item
15), burner status alarm (Figure 10, Item 16), high temp alarm (Figure 10, Item 17), and the burner
lockout alarm (Figure 10, Item 18);
Surge Arrestor (Figure 10, Item 19);
DC power supply (Figure 10, Item 20);
the Programmable Logic Controller module (Figure 10, Item 21);
Analog Input/Output (I/O) board modules 1 (Figure 10, Item 22), 2 (Figure 10, Item 23), and 3 (Figure
10, Item 24), and analog output board module 4 (Figure 10, Item 25).
4
5
11
12
6
7
13
14
15
16
17
18
8
19
9
10
20
25
21
24
23
22
Figure 10. Programmable Logic Control.
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