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5696 675 - 06
Vitocell 300-H, EHA Series Installation
All piping reverse return or use balancing valves.
1. Pipe together boiler (not shown) and tanks as
illustrated. Connections must be accessible for
service (use factory supplied adaptors).
2. For boiler water supply temperatures over 203°F
(95°C):
Remove plastic supply and return grommets
(grommets are left threaded).
3. Pipe supply line with an elevation and install an
automatic air vent at the highest point.
4. Install boiler sensor in sensor well (see page 10).
5. Insulate piping.
The circulation pump is activated by the sensor /
operating aquastat and by the control system installed.
The operating aquastat should be mounted on the tank
which receives the boiler water supply last.
Viessmann recommends the installation of an additional
high limit aquastat in the main discharge pipe of the
DHW system.
This aquastat should be wired in series with the
operating aquastat and should be set approximately
9°F (5°C) higher than the operating aquastat.
IMPORTANT
Legend
A Vitocell 300-H F 1a*1
B Boiler water supply G 2” *1
C Boiler water return H 3” *1
E Operating aquastat K 4” *1
L 5” *1
*1 Pipe size for boiler supply and return to heat exchanger.
Multiple DHW Tanks [only for 92 and 119 USG (350 and 450 L)]
DHW tank battery with
2 x 357 USG
(2 x 1350 L)
(2 x triple cell)
WARNING
Install tempering valve(s) to protect against scalding.
WARNING
Do not stack more than three tanks. Stack only tanks of
identical size.
DHW tank battery with
357 USG (1350 L )
(triple cell)
Connections
DHW tank battery
with 184 or 238 USG
(700 or 900 L)
(dual cell)
DHW tank battery with
2 x 184 or 2 x 238 USG
2 x (700 or 2 x 900 L)
(2×dual cell)
12


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