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1 6 | Bosch IDS BVA 2.0
5.1 Indoor Fan Motor Function
System operation and function
Two Stage Fan Control
The IDS 2.0 IDU supports two stage fan control which requires a two stage
thermostat (Y1&Y2). When there is a call for Y2, the blower motor will turn to high
speed setting. When there is a call for Y1, the blower motor will turn to low speed
setting. Unit will run at low speed setting when there is only G call. It will run in high
speed setting when there is W/W1/W2 signal (when the electric heat kit is on).
The X13 ECM motor supports 5 speeds. Customer can select the suitable speed by
adjusting the SW6-1 and SW6-2 dip switches. Refer to Airfl ow Performance Table
(Table 7) for reference airfl ow. Refer to fi gure 23 for dip switches settings.
If 2 stage thermostat is not available, single stage thermostat may be used, please
refer to Wiring Diagram section for wiring instructions. If Y1 and Y2 are jumped, the
unit will only run in high stage fan speed.
Anti-Cold Air Fan Delay
The Anti-Cold Air Fan Delay function utilizies a sensor (T2) located on the indoor
coil, which prevents the blower from turning on until the coil has reached a certain
temperature. This feature prevents cold air blow during heating operation.
1.
When SW6-3 dip switch is set to the "ON" position and the unit is in heating
mode, the Anti-Cold Air Fan Delay function will activate based on the
following entry conditions (all 3 conditions must be met):
a. Indoor Coil Temperature (T2) < 82.4℉
b. Electric heat kit is turned off
c. There is a call for Y1 from thermostat to indoor unit
2.
This function will deactivate if ONE OF the following exit conditions are met
OR the system has been operating in heating mode for 15 minutes.
a. T2 ≥ 89.6℉
b. Heater kit is turned on
c. The system is NOT running Heat mode
3.
During the heating mode, if one of the exit conditions of Anti-Cold Air is
satisfi ed, the blower motor will turn on in fi rst stage fan speed.
4.
During the heating mode, if all of the entry conditions of Anti-Cold Air are
met and maintained for 120s, the blower motor will change to fi rst stage
speed.
Heating Fan Delay
If SW6-3 dip switch is set to the "OFF" position and the unit is in heating mode, the
blower will operate with a 90 second delay with the fan speed dictated by Y1 or Y2
signal.
Passive Dehumidifi cation (Optional)
IDS 2.0 IDU has a Passive Dehumidifi cation function which lowers the fan speed
(fi rst stage) with a DH call from the thermostat. This function requires proper DH
wiring from the indoor unit to the thermostat (with a humidistat).
If DH wire is not connected, the unit will still function normally.
Data subject to change
Installation Instructions
02.2019 | Bosch Thermotechnology Corp.
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