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5833 275 - 04
Vitotrans 300 Installation, Operating and Service
Service
Preparing for Service
(continued)
1. Remove junction box retaining screws.
2. Remove junction box cover panel.
Accessing the junction box
1. Turn the hydronic connection valves to the closed
position.
2. Connect a hose from the Vitotrans heating system
drain shutoff valve and route to a floor drain (when
servicing the heating system side). Open the valve.
3. Connect a hose from the Vitotrans DHW drain shutoff
valve to a floor drain (when servicing the DHW side).
Open the valve.
Isolating from system hydronics and draining the Vitotrans
