Technical Manual

System Design Guidelines
10 VITOCELL 100-B
Sensor wells
The sensor wells are welded into the DHW
tank.
Sensor wells for solar operation
For solar heating systems, Viessmann
recommends placement of the DHW tank
temperature sensor in the solar collector
return. This requires installation of a a brass
elbow with sensor well included in the
accessory pack.
Dimension 79/300 119/450
a
b
c
d
e
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
6 1/4
160
5.9
150
7/8”
22
¼
6.5
1
/
3
8
8.7
220
7.9
210
7/8”
22
¼
6.5
1
/
3
8
Heating water supply temperature
over 230ºF / 110ºC
These operating conditions require the
installation of an additional safety high limit
into the DHW storage tank, preventing the
domestic hot water temperature from rising
above 203 ºF/ 95 ºC. A domestic hot water
tempering valve must be used.
Temperature and pressure
relief valve
A temperature and pressure relief valve
(T&P relief valve) is supplied with the tank.
The heating contractor must install the
valve on each tank in a method meeting
code requirements. If local codes require a
different relief valve, substitute the
manufacturer’s supplied valve. The tank is
approved for 150 psig. Maximum operating
pressure is 150 psig.
The T&P relief valve supplied with the tank
is tested under ANSI Z21.22 Code for Relief
Valves and Automatic Gas Shut-off Devices
for Hot Water Supply Systems.
Backflow preventers
Where backflow preventers are required, a
domestic water expansion tank installation
is recommended in the cold water inlet
piping before the cold water enters the
Vitocell. For the backflow device, observe
local plumbing codes and regulations.
Watts Model
40XL-8
150 psig
(US and Canada)
ASME pressure
steam rating
1438 MBH
CSA temperature
steam rating
205 MBH
Relief
temperature
210ºF (99ºC)
Inlet thread
¾” male
Outlet thread
¾” female
Warranty excerpt
Our warranty for domestic hot water tanks
states that the water to be heated must be
of drinking (potable) water quality and that
any water treatment equipment in use must
function correctly.
Viessmann accepts no responsibility for
damage howsoever caused and reserves the
right to withdraw the product warranty if the
product has been improperly installed or
misapplied by the installer, contractor or end
user. In order to qualify for product warranty,
strict adherence to the installation and
service manuals must be assured. In the
event that Viessmann non-approved
components are utilized, Viessmann reserves
the right to withdraw all expressed or implied
warranties without written notice.
The water to be heated with the Vitocell
must be drinking (potable) water quality. If
the tank is used to heat other media, the
warranty will be null and void. Damage
resulting from excessive pressure or
temperature is clearly not the responsibility
of Viessmann.
The amount of chloride and sulfate
acceptable to the tank is limited. In areas
where high concentrations of chloride and
sulfate are present in drinking water, please
consult Viessmann for directions.
For full warranty details, please read the
product warranty card.
5
2
8
5
6
5
6
-
0
1
8” / 200 mm
Ø
7
/
8
” / 21 mm
Ø
5
/
8
” / 16 mm
a
b
c
d
e