Boiler Water Connections (Heat Exchanger Connection); Individual Dhw Tank - Viessmann Vitocell 300 EVI Series Installation Instructions Manual

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.
DANGER
Domestic hot water temperatures
over 125°F / 52°C can cause severe
burns instantly or death from scalds.
Children, disabled and elderly are at
highest risk of being scalded.
Feel water before bathing or
showering.
Temperature limiting valves are
available and must be used where
domestic hot water storage tank
temperatures exceed 140°F / 60°C.

Individual DHW tank

Boiler
Circulation pump
Spring-loaded flow check valve
Boiler water supply
Fig 8.
Recommended piping of an individual tank
IMPORTANT
Use hemp and pipe dope on all threaded
stainless steel nipples on tank.
Individual DHW tank
Max. boiler supply temperature
Max. operating pressure
H heat exchanger
H tank
Max. testing pressure
H heat exchanger
H tank
Max. domestic hot water temperature
Y
Sensor/Aquastat well
Vitocell 300
Boiler water return
WARNING
Install tempering valve(s) to protect
against scalding.
Connections
250°F
210°F
1. Pipe together boiler and tank as
illustrated. Connections must be
accessible for service (use factory
supplied adaptors). Viessmann
flexible piping of stainless steel
(accessory) may be used.
2. For:
- boiler water supply temperatures
over 203°F / 95°C and
- 79 and 120 USG / 300 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 temp.
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. Install DHW tank temperature sensor
in sensor well (see pages 11 and 12).
5. Insulate piping.
120°C
375 psig
150 psig
480 psig
300 psig
99°C
13