Installation; Installation Diagram; Water Connections - A.O. Smith ST-400 Installation, User And Service Manual

2

2.1 Installation diagram

Legend
1. pressure relief valve
(mandatory if mains water
pressure is too high)
3. T&P-valve
4. stop valve (recommended)
5. non-return valve
(mandatory)
6. circulation pump (optional)
9. drain valve
11. service stop valve
12. temperature gauge
(optional)
14. draw-off points
15. expansion valve
(mandatory)
16. expansion vessel
(mandatory)
A. cold water supply
B. hot water supply
C. circulation pipe

2.2 Water connections

2.2.1
0312731_ST_400-1000_NLENFR_V3.0, 2018-01-04

Installation

This figure shows the installation diagram. This diagram is referred to in the sections
describing the actual connection procedure.
Note
These products can be installed as vented and unvented. This manual only
discusses unvented installations. For information about vented installations please
contact A.O. Smith.
Installation Diagram
Warning
The installation should be carried out by a competent person, in compliance with
general and locally applicable regulations.
Cold water side
See (A) in the installation diagram (2.1 "Installation diagram").
1. Fit an approved stop valve (4) on the cold water side as required by the
applicable regulations.
2. The maximum working pressure of the storage tank is 10 bar. Because the
pressure in the water pipe at times can exceed 10 bar, you must fit an approved
pressure-reducing valve (1).
3. Fit a non-return valve (5) and an expansion vessel (16).
4. Fit an expansion valve (15) and connect the overflow side to an open waste water
pipe.
IMD-0550 R1.0
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