25
5833 275 - 04
Vitotrans 300 Installation, Operating and Service
Electrical Connections
(continued)
Pump connections for systems with a DHW storage tank
Terminal
Block X2
Provide
disconnect
means and
overload
protection
as required.
Power
Supplies
Legend
A
Building DHW re-circulation pump (field supplied)
(Vitotrans terminal block X2, terminals 3 and 4)
(Power supply 120VAC/1Ph/60Hz, Max. 2 FLA
thru
contacts)
B
DHW DHW storage tank loading pump (field supplied)
(Vitotrans terminal block X2, terminals 5 and 6)
(Power supply 120VAC/1Ph/60Hz, Max. 2 FLA
thru
contacts)
Note:
See complete system layouts starting on page 8.
Note:
The dry contact relays for the DHW tank loading
pump and DHW re-circ pump have a maximum rating
of 2 FLA. Pumps exceeding this rating will require
field supplied motor starter, contactor or relay.
Installation