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
E
17
E1
8
E
19
E2
0
E
21
B
K
B
K
W
H
W
H
W
H
R
D
B
R
Y
L
B
L
R
D
P
U
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.
