Technical Manual

Product Installation
7”/175 mm
Ø ¼”/7 mm
Ø
1
/
3”
/
9 mm
15”/380 mm
Ø ½”/15 mm
Ø ¾”/19.2 mm
Ø 1”/24 mm
10 VITOCELL 300-H
Sensor Well
Vitocell 300-H,
with 42 and 53 USG / 160 and 200 ltr
capacity
The sensor well is welded into the DHW
tank.
Vitocell 300-H,
with 92 and 119 USG / 350 and 450 ltr
capacity
Heating water supply temperatures
over 230°F / 110°C
For these operating conditions, an approved
high limit safety aquastat must be installed
to limit the domestic hot water temperature
to 203°F / 95°C in the tank.
Vitocell-H domestic hot water tank
positioned under the boiler
Please note that only the boiler/tank
combinations stated in the Price List are
possible. In the case of the 92 USG / 350 ltr
capacity Vitocell 300-H , the boiler can only
be positioned on the DHW tank so that it is
flush at the front.
Recirculation tapping
The recirculation tapping on the Vitocell-H
300 is also the opening for mounting the
temperature and pressure relief valve.
If this opening is utilized for recirculation,
extend the stainless steel nipple on the tank
with a brass tee of the same size as the
stainless steel nipple ∅ to accommodate
both connections; see installation
instructions.
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 100 psig where a CRN is
required. Maximum operating pressure is
150 psig.
The T&P relief valve supplied with the tank
is ASME pressure steam rated for 998 MBH
and CSA temperature steam rated for
200 MBH. It is tested under ANSI Z21.22
code for Relief Valves and Automatic Gas
Shut-off Devices for Hot Water Supply
Systems.
For steam applications, a field supplied 1”
T&P valve must be utilized.
Watts Model
40XL-8
100 psig
(Canada
where
CRN is
required)
150 psig
(US and
Canada)
ASME pressure
steam rating
998 MBH 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 heated should be of
drinking water quality and that any water
treatment equipment in use must function
correctly.
If the product has been improperly installed
or misapplied by the installer, contractor or
final user, Viessmann accepts no
responsibility for damage howsoever caused
and reserves the right to withdraw the
product warranty. In order to qualify for
product warranty, strict adherence to the
installation and service manuals must be
observed. 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.
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.
5
1
6
7
5
3
4
-
0
1
To ensure optimum, safe operation,
the supplied stainless steel well must
be installed. The well diameter is
large enough to accommodate a wide
variety of sensing bulbs.
Always use spring clip to ensure
proper contact of capillary bulb
against the stainless steel well for
proper sensing/heat transfer!
WARNING