Viessmann VITOTRON 100 Installation And Service Instructions Manual page 11

Vitotron 100 Electric Space Heating Hot Water Heater 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
space heating water heater. 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 space heating water heater 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 space heating water
heater 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 space heating water
heater 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 Text
terminals on the control panel, the space heating
water heater 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 space
heating water heater, 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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