Bedienungsanleitung A.O. Smith Instano ICW 25 (Seite 17 von 64) (Englisch)

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5 - INSTALLATION

Figure 5-5 - Typical piping

means of appropriate siphon with disjunction capable

of preventing the pressurisation of the system and to

prevent the return of bad odours from the sewer (detail

“5” in gure 5-5).

because the condensate is acid some local codes

require the installation of a condensate neutraliser before

connection with the domestic waste drain (see section

9 for the value of acidity of the condensate and the ow

rate).

be connected to a plastic (not copper) drain pipe with a

minimum internal pipe diameter equal to or greater than

13 mm;

be installed in a way to prevent the liquid from freezing;

therefore pay attention to any external passings. It is

prohibited to drain into gutters or drainpipes;

to slope continuously towards the drain point, avoid high

points, which could pressurise the pipe;

5.8 - Safety pressure relief valve

The appliance is protected against overpressures by a

safety valve rated to 10 bar (see gures 3-1 and 3-4

detail “28”). The safety valve drain is conveyed on the same

pipe “9” as per gure 5-5.

CAUTION !!! If not connected to the drain,

whenever the safety valve should intervene, it could

cause damage to persons, animals or objects.

5.9 - Hydraulic and gas connections

CAUTION !!! The example in gure 5-5 is a

concept drawing only. It is up to the system designer

to determine the necessary components, including

additional equipment which in the judgement of the

designer are appropriate, in order to properly size,

congure and design that system and to ensure

compliance with local and national code.

Key of gure 5-5:

1 = Water heater

2 = Gas manual valve (EN 331 type-approved) (Field

supplied)

3 = Water isolation valve / Flow rate selector (Field

supplied)

4 = Water drain valve (Field supplied)

5 = Condensate drain (Field supplied)

6 = Gas inlet

7 = Cold water supply

8 = Domestic hot water

9 = Condensate drain pipe

10 = Water isolation valve (Field supplied)

11 = Filter (Field supplied)

5.10 - Secondary return

If distances between water heater and faucets/shower

heads are long then a recirculation system can be used to

get “instant” hot water.

When using an external recirculation pump make sure that

this is a specic hot water circulation pump.

The ow must exceed the minimum water ow.

Prevent for running the circulation pump 24/7 by using a

timer and/or thermostat or use an on-demand recirculation

system activated by push button or motion sensor.

To operate the secondary return pump properly, operate as

follow:

1.- install the appliance as shown in gure 4-4;

2.- open one tap of the sanitary utilities to eliminate

presence of air;

3.- turn off the secondary return pump;

4.- open one hot water sanitary tap and wait until the hot

water temperature is stable;

5.- close the hot water sanitary tap;

6.- check that after 50 seconds after closing the tap, tap

icon on the display has stopped ashing;

7.- if the tap icon keeps ashing, it means that the internal

pump can run the water in the secondary return circuit to a

value above 2 l/min (veriable on the parameter 1062);

8.- operate on the valve “A” of Figure 4-4 in order to bring

the recirculation ow rate to a value lower than 2 l/min;

9.- now the appliance can work correctly.

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