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Connections
Boiler Water Connections (heat exchanger connection)
WARNING
The operating aquastat and any
secondary high limit aquastat of the
tank must be set such that the DHW
temperature inside the tank never
exceeds 210°F / 99°C.
Individual DHW tank
Fig 9.
Recommended piping of an individual tank
Vitocell 300
Sensor/Operating aquastat well
Automatic air vent
IMPORTANT
This is a simplified conceptual drawing
only! Piping and necessary componentry
must be field verified. Proper installation
and functionality in the field is the
responsibility of the heating contractor.
14
Max. boiler supply
temperature
392°F / 200°C
. . . . . . . . . . . . . . . . . . .
Max. domestic hot water
temperature
210°F / 99°C
. . . . . . . . . . . . . . . . . . . . . .
Max. operating pressure
- heat exchanger
. . . . . . . . . . . . . . . . . . . . . . .
- tank
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Max. testing pressure
- boiler and heat exch.
. . . . . . . . . . . .
- tank
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spring-loaded flow-check valve
Circulation pump
Boiler water supply
Boiler
Boiler water return
IMPORTANT
Use hemp and pipe dope on all threaded
stainless steel nipples on tank.
DANGER
Domestic hot water temperatures
over 125°F / 52°C can cause severe
burns instantly or death from scalds.
220 psig
Children, disabled and elderly are at
150 psig
highest risk of being scalded.
Feel water before bathing or
480 psig
showering.
300 psig
Temperature limiting valves are
available and must be used where
domestic hot water storage tank
temperatures exceed 140°F / 60°C.
1. Pipe together boiler and tank as
illustrated. Connections must be
accessible for service (use factory
supplied adaptors). We recommend
using Viessmann Flexible Piping of
stainless steel (accessory).
2. For:
- boiler water supply temperatures
over 203°F / 95°C and
- 92 and 120 USG / 350 and 450 ltr
tanks:
Remove plastic supply and return
grommets (grommets are left
threaded).
3. Pipe supply line with an incline and
install componentry as follows:
H flow check valve, to stop gravity
circulation of hot water back to the
boiler when the boiler temperature is
lower than the actual tank
temperature
H automatic air vent, at the high point
from the boiler supply to the tank heat
exchanger
H drain valve, on the boiler return piping
from the tank heat exchanger coil
H isolation valve, on the boiler supply
and boiler return piping to the tank
coil.
4. Protect all domestic hot water
drawpoints from excessive water
temperatures via a tempering valve.
5. Install DHW tank temperature sensor
in sensor well (see page 13 or 14).
6. Insulate piping.
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