Viessmann Vitorond 100 VR1 Series Installation And Service Instructions Manual page 38

Riello Burner Set-up
Electrical Connections (with Hydrostat 3250-Plus control)
All field supplied nominal 120 VAC voltage wiring
H
must be sheathed in a flexible metal conduit.
Disconnect means, overload protection and low water
H
cut-off must be provided as required by local codes.
Connect incoming line voltage HOT (L1) wire to
H
terminal L1, and N to terminal L2 of the Hydrostat
3250-Plus control (see wiring diagram).
Legend
A Burner and control harness,
(see wiring diagram on page 39)
B Cable strap (supplied)
C Hydrostat 325-Plus control
38
Vitorond 100, VR1-22 to -33 Installation and Service
WARNING
Electric shock hazard. Can cause severe personal injury
or loss of life if power source, including service switch
on boiler, is not disconnected before installing or servicing.
Installations must follow these codes and requirements:
- National Electrical Code, ANSI/NFPA 70, latest edition
and any additional national, state or local codes.
- In Canada, CSA C22.1 Canadian Electrical Code Part 1
and any local codes.
- Wiring must be N.E.C. Class 1. If original wire as
supplied with boiler must be replaced, type 105°C
wire or equivalent must be used. Supply wiring to
boiler and additional control wiring must be 14 ga.
or heavier.
- Provide electrical ground at boiler as required by codes.
Burner wiring
1. Secure control harness A using 2 supplied cable
straps B.
WARNING
Ensure that burner wiring harness is properly attached
and secured to the boiler side panel using the supplied
cable straps as depicted above. The cable strap must
be coiled on the boiler side panel so that no slack is left,
allowing the burner/boiler door to be swung open without
disconnecting the burner wiring harness from the burner.
Failure to heed this warning may result in personal injury.
Room thermostat wiring
1. Install thermostat on inside wall away from influences
of drafts, hot or cold water pipes, lighting fixtures,
television, sun rays or fireplaces.
2. Follow instructions supplied with room thermostat.
If it has a heat anticipator, set heat anticipator in
thermostat to match power requirements of
equipment connected to it. Boiler wiring diagrams
give setting for standard equipment.