Service Manual
Bosch IDS 2.0
| 35
Bosch Thermotechnology Corp.
|
07.2021
Data subject to change
11.3.3 Indoor Unit Dip Switch Settings
Figure 12
Indoor board dip switches
11.3.4 When to Change Indoor Unit Dipswitch Settings
NOTICE:
Power should be turned off when adjusting dip switches.
In most scenarios, it is recommended to keep all indoor unit board dip switch
positions in their manufacturer default positions. There are some specifi c scenarios
when it makes sense to change dip switch settings:
SW6-1/2:
Default positions vary by air handler size, see Table 25.
Changing the position of these dip switches changes the fan motor speed
settings for high and low speed.
Reason to change from default:
The manufacturer recommends 350-450
CFM/ton, the static pressure and speed tap settings infl uence the CFM. Refer
to the air fl ow performance chart in the IOM to select fan speed settings
depending on your application.
Dip Switch Position
Low Fan Speed
High Fan Speed
Default
SW6-1
OFF
1
2
SW6-2
OFF
SW6-1
OFF
1
3
Default on 48 air
handler model
SW6-2
ON
SW6-1
ON
2
4
Default on 24/36/60
air handler model
SW6-2
OFF
SW6-1
ON
3
5
SW6-2
ON
Table 25
SW6-3:
Default is ON position, which turns on the Anti-Cold Air Fan Delay
function. This function utilizes a sensor (T2) located on the indoor coil,
which prevents the blower from turning on until the coil has reached
a temperature of 89.6 deg F, at which point it will run in low speed.
The blower will exit the Anti-Cold Air Fan Delay function when the coil
temperature is above 100.4 deg F. This feature prevents cold air blowing
into the space during heating operation. If dip switch changes to ON, the
fan will operate in heating mode with a 90 second fan delay.
Reason to change from default:
Recommended to be used only as-needed
as a result of customer expectations and/or performance
SW6-4:
Default is OFF position, but the function of this dip switch is
simply reserved for future use (no functionality at this time).
Reason to change from default:
Never recommend to change from default.
