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5472 726 - 02
Vitotron 100 Electric Space Heating Hot Water Heater Installation/Service
Plumbing Installation Guidelines
Instructions for the Installer
1. Remove outer screws at the bottom and at the top
of space heating hot water heater and carefully open
the front cover.
2. The space heating hot water heater is wall hung
and must be installed in a vertical position where
plumbing connections are located at the bottom.
Utilize key holes slots to hang the space heating hot
water heater. Refer to diagram on clearances (page 5).
3. The space heating hot water heater is provided with
a 3/8 in. air vent located on top of the heat
exchanger. It is designed to collect and remove air.
Ensure plastic drain tubing remains in place and exits
the space heating hot water heater in the lower right
corner.
4. The space heating hot water heater is equipped with
a pre-charged flat expansion tank located on the back
housing of the space heating hot water heater.
Expansion tank has a Shrader valve, which location
is shown on the figure. This figure presents the
bottom view of the space heating hot water heater.
Access to the valve is only from the bottom of the
space heating water heater. From there it can be
connected any pressure gauge to check the pressure
or pump to refill the air inside the tank.
5. The space heating hot water heater is equipped with
an ASME approved 30 psi automatic safety pressure
relief valve. Install the necessary length of
c
in.
copper piping from the relief valve to within 6 in. of
the floor to prevent personal injury or water damage
to surrounding area.
6. Observe inlet return piping (blue) and outlet supply
feed piping (red) connections. Install full way shut
off valves below inlet and outlet connections before
plumbing the space heating hot water heater to the
hydronic heating system.
DO NOT reverse these connections to the radiant
supply and return manifolds. Optional temperature
or pressure gauges can be installed below the space
heating hot water heater if desired.
7. Install a space heating hot water heater drain valve(s)
as necessary to aid in filling, purging and draining of
unit and the related system components.
8. Water supply feed or pressure reducing valve can
be installed to comply with local building codes.
Local codes may require a back flow preventer called
a check valve when installing a fixed domestic water
supply line to the space heating hot water heater.
