Viessmann Installation Instructions For Contractors page 9

Connecting to the wireless thermostat
Press the button on the wireless receiver for longer
than 3 seconds until control lamp 1 starts flashing.
Now connect the transmitter (wireless thermostat).
Wireless thermostat operating instructions
Once control lamp 1 on the receiver stops flashing,
the devices are assigned.
Deleting all device assignments
To delete all device assignments, press the button
on the wireless receiver for longer than 30 seconds
until control lamp 1 flashes briefly.
Activating wireless protocol X3D
The wireless receiver is factory-set to wireless
protocol X3D.
If the wireless receiver has been switched to
wireless protocol X2D, then X3D can be activated
as follows:
1. Switch on the power.
Control lamp 2 indicates the active protocol:
Flashing x2:
Flashing x3:
X2D
X3D (no changeover
required)
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