Recirculation Connections - Viessmann VITOCELL 300-H Installation Instructions Manual

Connections

Recirculation Connections

Connection of a recirculation system in a multiple
tank installation for systems utilizing boilers or remote
heating plants without low temperature boiler return
water and for steam heating operation with 15 psi and
one recirculation line.
Legend
A Domestic hot water
B Recirculation circuit
C Domestic cold water
Pipe domestic hot water supply piping with tank as

illustrated. Connections must be accessible for service
(use factory supplied adaptors). Connection sizes are
provided in section entitled Orientation and
Dimensions on page 9.
Install recirculation pump, flow-check valve and

recirculation timer (for shut-down during off-hours
where feasible) on the recirculation piping side.
Gravity circulation of the recirculation system is

restricted due to the upward-curved domestic hot
water discharge piping inside the tank.
Connect tank battery to existing recirculation piping.

Cap off unused recirculation connections of
individual tanks.
Saving Energy
A timer on the recirculation pump reduces the heat loss
significantly in commercial applications during times when
no or reduced demand for domestic hot water occurs.
18
Vitocell 300-H, EHA Series Installation
Connection of a recirculation system in a multiple
tank installation for remote heating plants with low
temperature boiler return water limit and/or for multiple
recirculation lines.
Legend
A Domestic hot water
B Recirculation circuit
C Domestic cold water
Recirculation tapping
[only for 92 and 119 USG (350 and 450 L)]
Legend
A 42 and 53 USG (160 and 200 L) storage capacity
B 92 and 119 USG (350 and 450 L) storage capacity
The recirculation tapping on the tank is also the opening
for mounting the temperature and pressure relief valve
(T&P valve).
If this opening is utilized for recirculation, extend the
stainless steel nipple on the tank with a brass tee
(field supplied) of the same size as the stainless steel
nipple diameter to accommodate both connections.