Bosch BGH96M060B3A Installation, Operation And Maintenance Manual page 21

Installation, Operation & Maintenance Manual
NOTICE:

In this installation, hoses connecting between ports of
overflow protection pressure switch (overflow switch)
and pressure tabs on the condensate collector box MUST
be switched. The overflow switch has two ports, which is
different from two other regular pressure switches that
have only one port. Make sure that black port (positive)
is connected to the lower position tap on condensate
collector box and gray port (negative) to higher tap of
condensate box. Connecting incorrectly will result in
failure to protect condensate overflow. See Fig. 19.
Upflow & Horizontal Right side
A to + P1(black port)
B to – P2(grey port)
Horizontal Le side
A to – P2(grey port)
B to + P1(black port)
B
Condensate Collector Box
Figure 18
NOTICE:

Two pressure switches (one port type switches) should
be relocated to other side of furnace side panel to ensure
pressure switches are above water tap of condensate
collector box.
Bosch Thermotechnology Corp. | 04.2019
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Bosch 96% AFUE Gas Furnace | 21
Data subject to change