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Installation Instructions
For installations with left air discharge and venting outlet through furnace
top panel (see Figures 17 and 18).
NOTICE:
In this installation, hoses connecting between ports of
f
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
f
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 field supplied elbow and metal hose clamp to make flue vertical. Elbows
should be as close to the furnace as possible. Connect the vent outlet pipe.
6.
Use provided or field 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 17
Horizontal Left Side Installation, Vent Through Top Panel
2 0 |
AIR INLET
HIGH/LOW FIRE
PRESSURE
HOSE
SWITCHES
CLAMP
Φ16 mm HOSE
DRAIN TRAP
DRAIN TRAP MOUNTING BRACKET
Bosch 96% AFUE Condensing Gas Furnace - BTC 770503101 J (06.2023)
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 17.
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 17 and 18). 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 18
Pressure Switch Position
JUNCTION
BOX
CONDENSATE COLLECTOR
BOX
14mm HOSE
Φ14/16 mm ELBOW (optional)
HOSE CLAMP
Upright
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