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5696 675 - 06
Vitocell 300-H, EHA Series Installation Connections
Steam Heating Side Connections [only for 92 and 119 USG (350 and 450 L)]
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).
Do not use Vitocell indirect-fired hot water storage
tanks in superheated steam applications.
Use appropriate control strategy.
Control strategy must ensure that the values below are
not exceeded.
Install a steam-side control to regulate DHW
temperature and ensure that the DHW
temperature does not exceed 210°F (99°C).
g Maximum working pressure on heat exchanger
side up to 220 psig at 392°F (200°C) or a steam
pressure of 15 psig at 250°F (121°C)
g Maximum working pressure on DHW water side of
up to 150 psig at 210°F (99°C)
WARNING
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).
1. Pipe steam and condensate lines as illustrated.
Connections must be accessible for service (use
factory supplied adaptors).
2. Remove plastic grommets on tank where condensate
lines connect (grommets are left threaded).
3. Install DHW tank temperature sensor in sensor well;
install steam valve.
4. Insulate piping.
See Installation Instructions Control Valve
CAUTION
For steam applications, a field supplied 1” T&P valve
must be utilized.
Legend
A Vitocell 300-H
B Sensor/Aquastat well
C Vacuum breaker
D Steam valve
E Steam supply line
F Condensation return line
G Condensate trap
Recommended piping of an individual tank in a steam system
Individual DHW tank
Note: For heating water flow temperatures above
203°F (95°C), remove the pipe collars from
the pipe outlets of the heating coils (pipe collars
have left hand threads).
13


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