Bosch BGH96M060B3A Installation, Operation And Maintenance Manual page 20

2 0 | Bosch 96% AFUE Gas Furnace
For installations with left air discharge and venting outlet through furnace
top panel (see Figures 16 and 17).
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.
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.
1. Remove cap from left side panel of furnace and cut the insulation
accordingly.
2. Remove 3 screws securing air inlet coupler on top panel and remove
coupler.
3. Mount coupler to the right side using the same screws saved from last step.
Connect air inlet pipe to air inlet coupler.
4. Seal the top panel air intake hole using the caps removed from side panel.
5. Use fi eld supplied elbow and metal hose clamp to make fl ue vertical. Elbows
should be as close to the furnace as possible. Connect the vent outlet pipe.
6. Use provided or fi eld supplied (if applicable) mounting bracket to mount
condensate trap on the proper location of the left side panel.
VENT OUTLET
FIELD
SUPPLIED
ELBOW
AIR
INLET
COUPLER
Figure 16
Horizontal Left Side Installation, Vent Through Top Panel
Data subject to change
AIR INLET HIGH/LOW FIRE
PRESSURE
HOSE
SWITCHES
CLAMP
Φ16 mm HOSE
DRAIN TRAP DRAIN TRAP MOUNTING BRACKET
7. Screws for mounting bracket should not interfere with any components
inside the furnace.
8. Connect 16 mm hose between condensate collector box and drain trap. Cut
the excess hose to correct length prior to connection.
9. Connect 14 mm hose between the side inducer drain port (remove black
rubber plug to connect hose) and drain trap. Refer to Figure 16.
10. Plug both holes on inducer elbow using provided plugs.
11. Cut the excess hoses as needed.
12. Secure and tighten all hoses.
13. Relocate junction box to the other side of cabinet if necessary.
14. Relocate the High/Low Fire Pressure Switches (2) to the opposite side of
the cabinet (as shown in Figure 16 and 17). Screws for mounting these
switches should not interfere with any components inside the furnace.
High/Low Fire
Pressure Switch
Ensure condensate
hose is connected to
side inducer drain port
on inducer as shown.
Overflow
Pressure Switch
Figure 17
Pressure Switch Position
JUNCTION
BOX
CONDENSATE COLLECTOR
BOX
14mm HOSE
Φ14/16 mm ELBOW (optional)
HOSE CLAMP
Installation, Operation & Maintenance
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04.2019 | Bosch Thermotechnology Corp.