Hot Water Connection; Circulation Connection; Electrical Connections - A.O. Smith DRE PLUS Installation, User And Service Manual

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Install the cold water connection:
1. When the mains water supply pressure is too high, install a pressure reducing valve
(1), refer to the Technical details.
2. Install a non-return valve (5).
3. Install an expansion valve (15).
4. Connect the overflow connection of the expansion valve, to an open waste water
pipe.
5. Install an expansion vessel (16).

Hot water connection

Note
Insulate long hot water pipes to prevent unnecessary energy loss.
Note
The use of a T&P valve is mandatory.
Install the hot water connection:
1. Install a stop valve (11) in the hot water outlet pipe for service reasons.
2. Install a T&P valve (3).
3. If applicable, install a temperature gauge (12).

Circulation connection

Install a circulation system when an immediate flow of hot water at draw-off points is
required. This improves comfort and reduces water wastage.
Note
Connect the circulation pipe (C) to the cold water inlet connection.
Note
Make sure that the circulation pump has the correct capacity for the length and
resistance of the circulation system.
Install a circulation pump:
1. Install a circulation pump (6).
2. Install a non-return valve (5) after the circulation pump to make sure that the
direction of circulation is guaranteed.
3. Install a stop valve (4) before the circulation pump.
4. Install a stop valve (4) after the non-return valve.
5. Connect the circulation pipe (C) to the cold water inlet, between the water heater
and the expansion vessel (16).

Electrical connections

Warning
Leave the water heater electrically isolated until you are ready to commission it.
Installation, Maintenance and Service part