22
IM 474-3
Service Information
Wiring Diagram
The following wiring diagram is identical to the one in the OPM Panel. It is reproduced here for your
convenience. The legend is shown in Table 8.
Table 8. OPM Panel Schematic Legend
Component
designation Description
CB1 ....................... Circuit breaker
MCB...................... Microprocessor Control Board
T1 .......................... Transformer: 115/24 Vac
T2 .......................... Transformer: 24 Vac/18 Vac-CT
TB2 ....................... Terminal block: low voltage section
Factory wire number
Field wiring terminal
Field wiring
Printed circuit board terminal
Twisted, shielded pair cable
Figure 12. OPM Panel Schematic
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