Bosch BGH96M080B3A - Circulator Blower Speed Adjustment; Blower Speed Settings and Procedure

Installation, Operation & Maintenance Manual Bosch 96% AFUE Gas Furnace | 47
Bosch Thermotechnology Corp. | 04.2019
Data subject to change
11.8 Circulator Blower Speed Adjustment
WARNING: ELECTRICAL SHOCK HAZARD
 Turn OFF power to the furnace before changing speed taps.
This furnace is equipped with an X13 ECM circulator blower motor. This blower
provides ease in adjusting blower speeds. Refer to the table below for blower speed
factory settings. These blower speeds should be adjusted by the installer to match
the installation requirements so as to provide the correct heating temperature rise
and the correct cooling CFM (Refer to Tables 3 & 4, (pages 24-25) - Air Delivery -
CFM (Without Filter)*.
Model HI COOL LOW COOL HI HEAT LOW HEAT
BGH96M060B3A Mid-H(4) Mid(3) Mid-H(4) Mid(3)
BGH96M080B3A Mid-H(4) Mid(3) High(5) Mid(3)
BGH96M080C4A Mid-H(4) Mid(3) High(5) Mid(3)
BGH96M100C5A Mid(3) Mid-L(2) Mid-H(4) Mid-L(2)
BGH96M100D5A Mid(3) Mid-L(2) Mid(3) Mid-L(2)
BGH96M120D5A Mid-H(4) Mid(3) Mid-H(4) Mid(3)
Table 24 Blower Speed Factory Settings
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, pull out the wire leads from
the second row of terminals located below the control board (refer to Figure
39). Find the correct terminal and connect the leads.
Figure 39
E17
E18
E
19
E20
E21
BK
BK
WH
WH
W
H
RD
BR
Y
L
BL
RD
PU
NEVER MOVE LEADS
LOCATED ON TOP ROW
THESE LEADS (SECOND ROW) ARE
RELOCATED TO CHANGE FAN SPEED
4. Turn ON power to furnace.
5. Verify proper temperature rise is as outlined in Temperature Rise section
and on the unit nameplate.