Viessmann VITOCELL 300-H Service Manual download pdf (Page 16)

Connections

Steam Heating Side Connections only for 92 and 120 USG / 350 and 450 ltr capacity

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 st eam-side control to regulate DHW temperature and ensure that the DHW

temperature does not exceed 210°F / 99°C.

H Maximum working pressure on heat

exchanger side up to 220 psig at

392°F / 200°C or a steam pres s ure of

15 psig at 250°F / 121°C

H Maximum working pressure on DHW

water side of up to 150 psig at

210°F / 99°C

Individual DHW tank

Vitocell 300

Sensor/Aquastat well

Vacuum breaker

Steam valve

Steam supply line

Condensation return line

Condensate trap

1. Pipe steam and condensate lines as

illustrated. Connections must be

accessible f or service (use factory

supplied adaptors).

Use hemp and pipe dope on all threaded

stainless steel nipples on tank.

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.

Installation Instructions

Control Valve

4. Insulate piping.

5167 535 v1.3

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 s calded.

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.

DANGER

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.

WARNING

Fig 10.

Recommended piping of an individual tank in a steam system

IMPORTANT

For steam applications, a field

supplied 1” T&P valve must be

utilized.

CAUTION

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Viessmann VITOCELL 300-H Service Manual Page 16

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