Bosch BGH96M080C4B - Page 50

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Installation Instructions
Bosch 96% AFUE Condensing Gas Furnace - BTC 770503101 J (06.2023)
To adjust the circulator blower speed, proceed as follows:
1. Turn OFF power to the furnace.
2. Select the heating and cooling blower speeds that match the installation
requirements from Tables 3 & 4 - Air Delivery - CFM (Without Filter)*
3. If it is necessary to change the default settings, follow the below table to
change SW3 dip-switch to set suitable fan speed.
Dip Switch Setting
FAN SPEED
DIP SW NOMINAL SPEED
S3-1 S3-2 S3-3 H-heat L-heat H-cool L-cool
123
ON
OFF OFF OFF 4 2 2 2
123
ON
OFF OFF ON 4 2 3 2
123
ON
OFF ON OFF 4 3 3 2
123
ON
OFF ON ON 4 3 5 3
123
ON
ON ON ON 5 3 3 2
123
ON
ON ON OFF 5 3 4 3
123
ON
ON OFF ON 5 3 5 3
123
ON
ON OFF OFF 5 3 5 4
Table 26 Selectable Fan Speeds
4. Turn ON power to furnace.
5. Verify proper temperature rise is as outlined in Temperature Rise section
and on the unit nameplate.