Viessmann VITOTRON 100 Installation And Service Instructions Manual page 11

Vitotron 100 Electric Boiler Installation/Service
Electrical Installation
(continued)
Instructions for the Installer
5. The circulating pump requires a separate 120VAC,
15 amp electrical circuit. Utilize b in. electrical
knockout as marked on the left side of cabinet to
access circulating pump wiring connections inside
electric boiler. Do not combine the high voltage power
for circulating pump with any thermostat or off peak
low voltage wires.
An optional secondary pump can be installed in the
system for hydronic applications plumbed with multiple
circulators and or primary/secondary applications.
Utilize the Pump 2 connections to operate the
secondary pump. The secondary pump will
automatically turn on upon closure of thermostat
connections on control panel. Spare fuses are taped
into the inside cover.
Fuses specified as:
Time-delay Glass Fuse 6.3 x 32 mm 2A.
6. Thermostat - This electric boiler can be signaled
to turn on from a standard two wire thermostat,
end switches of an actuating valve or a zone control
panel. These connections should all be voltage
free (dry contact). Extend wires from thermostat
to TT connections on control panel using 2 x 18
gauge wires. Utilize b" electrical knockout to left side
of control panel to gain entrance to this connection.
Install thermostat in a location where it will not be
influenced by other heat sources.
7. Off peak control (optional) -This electric boiler is
equipped with a connection (normally closed) to
receive a utility signal for off peak denoted by OP on
the control board. Ensure the interconnection from
utility radio receiver is voltage free (dry contact).
Consult with local utility on questions with off-peak
installations. Keep blue/white jumper wire in place if
not connected to a utility radio receiver.
8. Outdoor compensation - The electric boiler can utilize
an outdoor sensor for outdoor compensation
capability. Install the outdoor sensor preferably on the
north side of the building. Keep the outdoor sensor
away from any sources of heat.
Refer to Advanced Settings on page 14 to set proper
heat curve. If no outdoor sensor is wired to the T
terminals on the control panel, the electric boiler will
work in normal operation
9. Final check. Verify all electrical connections are tight.
Loose connections can cause premature failures of
electrical components. Once you have finished the
above procedures and before starting the electric
boiler, understand the control buttons and indicators
on the control panel in the following page.
10. Re-fasten the screws on bottom (2) and top (1) to
hold front door in place.
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