A.O. Smith ADM - 80 - Manual (Page 23)

Instruction manual ADM 23
is
3.6.5 Circulation pipe
See (C) in the installation diagram (3.5 "Installation diagram") .
If an immediate flow of hot water is required at draw-off points, a circulation
pump can be installed. This improves comfort and reduces water wastage.
1. Fit a circulation pump (6) of the correct capacity for the length and resistance
of the circulation system.
2. Fit a non-return valve (5) behind the circulation pump to guarantee the
direction of circulation.
3. Fit two stop valves for service purposes (4).
4. Connect the circulation pipe to the T-piece at the drain valve (9) as shown in
the drain valve figure (3.6.4 "Drain valve") .
3.7 Water connections,
Unvented Warning
The installation should be carried out by an authorised installation engineer,
in compliance with general and local regulations (1.3 "Regulations") .
3.7.1 Cold water side
See (A) in the installation diagram (3.5 "Installation diagram") .
1. Fit an approved stop valve (4) on the cold water side as required by
applicable regulations (1.3 "Regulations") .
2. The maximum working pressure of the appliance is 8 bar. Because the
pressure in the water pipe at times can exceed 8 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
wastewater pipe.
3.7.2 Recirculation pipe
You can install a top to bottom circulation pump to prevent water stacking in the
boiler.
1. Optional: depending on the draw-off pattern, fit a recirculation pipe (Ø 22
mm), a stop valve (11) and a top to bottom circulation pump (7).
2. Fit a non-return valve (5).
3. Fit a stop valve (11).
3.7.3 Hot water side
See (B) in the installation diagram (3.5 "Installation diagram") .
Note
Insulating long hot water pipes will prevent unnecessary energy loss.
1. Optional: fit a temperature gauge (12) so you can check the temperature of
the tap water.
2. Fit the T&P valve (3).
3. Fit a stop valve (11) in the hot water outlet pipe for servicing.
3.7.4 Drain valve
1. Fit the standard drain valve (9) supplied with the appliance.
2. If applicable, fit a circulation pipe
(3.6.5 "Circulation pipe") .
If not, fit the blind threaded plug and gasket (C) supplied with the drain valve,
as shown in the figure.