Check Accessory Kit For Heating Circuit With Mixing Valve; Checking The Rotational Direction Of The Mixing Valve Motor; Changing The Rotational Direction Of The Mixing Valve Motor - Viessmann VITODENS 200-W WB2B Start-Up/Service Instructions

Corrective Action
A
Fig. 25
B
Fig. 26
A ON/OFF switch
B Rotational direction switch
(continued)

Check accessory kit for heating circuit with mixing valve

Checking the rotational direction of the mixing valve motor:

1. Switch ON/OFF switch A at the
accessory kit first OFF and then ON
again. The device will perform the
following self-check:
H Mixing valve "Close" (150 sec.)
H Pump "ON" (10 sec.)
H Mixing valve "Open" (10 sec.)
H Mixing valve "Close" (10 sec.)
Then standard control mode
resumes.
2. Note the rotational direction of the
mixing valve motor during its
self-check. Then set the mixing
valve manually to "Open" again.
Changing the rotational direction of the mixing valve motor (if required):
1. Remove the lower and upper housing
of the accessory kit.
Installation Instructions
Mixing Valve Accessory Kit
2. Change the rotational direction
switch:
Switch position I for system return
from the left (factory default
setting).
A
Switch position II for system return
from the right.
Troubleshooting
IMPORTANT
The supply temperature sensor must
now read a higher temperature.
If the temperature drops, either the
motor is turning in the wrong direction
or the mixing valve set is installed
incorrectly.
Installation Instructions
Mixing Valve
65