Bosch BGH96M080B3B - Page 21

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Installation Instructions
Bosch 96% AFUE Condensing Gas Furnace - BTC 770503101 J (06.2023)
NOTICE:
f 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.
Figure 19
Condensate Collector Box
B
A
+
_
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)
NOTICE:
f 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.