Manual Ariston Pro 1 Eco (page 10 of 18) (English)

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operated device to warn when discharge takes place. Note: The discharge will consist of scalding water and steam.

Asphalt, roong felt and non-metallic rainwater goods may be damaged by such discharges.

of withstanding high temperature discharges of water 3 m from any plastic guttering

systems that would collect such a discharge (tundish visible).

iv) Where a single pipe serves a number of discharges, such as in blocks of flats, the

number served should be limited to not more than 6 systems so that any installation

can be traced reasonably easily. The single common discharge pipe should be at

least one pipe size large than the largest individual discharge pipe to be connected.

If unvented hot water storage systems are installed where discharges from safety

devices may not be apparent i.e. in dwellings occupied by the blind, infirm or disabled

people, consideration should be given to the installation of an electronically operated

device to warn when discharge takes place. Note: The discharge will consist of

scalding water and steam. Asphalt, roofing felt and non-metallic rainwater goods may

be damaged by such discharges.

Valve outlet size Minimum size of

discharge pipe D1*

Minimum size of

discharge pipe D2*

from tundish

Maximum

resistance allowed,

expressed as a

length of pipe (i.e.

no elbow or bends)

Resistance created

by each elbow or

bend

G 1/2 15 mm 22 mm

28 mm

35 mm

Up to 9 m

Up to 18 m

Up to 27 m

0.8 m

1.0 m

1.4 m

G 3/4 22 mm 28 mm

35 mm

42 mm

Up to 9 m

Up to 18 m

Up to 27 m

1.0 m

1.4 m

1.7 m

G 1 28 mm 35 mm

42 mm

54 mm

Up to 9 m

Up to 18 m

Up to 27 m

1.4 m

1.7 m

2.3 m

Table 2

Sizing of copper discharge pipe “D2” for common temperature valve outlets.

Worked example

The example below is for a G 1/2” temperature & pressure relief valve with a

discharge pipe (D2) having 4 no. elbows and length of 7 m from the tundish to the

point of discharge.

From Table 2

Maximum resistance allowed for a straight length of 22 mm copper discharge pipe

(D2) from G 1/2” T & P valve is 9 m.

Subtract the resistance for 4 no. 22 mm elbows at 0.8 m each = 3.2 m.

Therefore the maximum permitted length equates to: 5.8 m.

As 5.8 m is less than the actual length of 7 m th

erefore calculate the next

largest size.

Maximum resistance allowed for a straight length of 28 mm pipe (D2) from G 1/2” T

& P valve equates to: 18 m.

Subtract the resistance for 4 no. 28 mm elbow at 1.0 m each = 4 m.

Therefore the maximum permitted length equates to: 14 m

As the actual length is 7 m, a 28 mm (D2) copper pipe will be satisfactory.

42.0.01.07204.03 pag. 9-20.qxd:42.0.01.07204.01 pag. 9-20 7-10-2016 11:28 Pagina 16

Worked example

The example below is for a G 1/2” temperature & pressure relief valve with a discharge pipe (D2) having 4 no. elbows and

length of 7 m from the tundish to the point of discharge.

From Table 2

Maximum resistance allowed for a straight length of 22 mm copper discharge pipe (D2) from G 1/2” T & P valve is 9 m.

Subtract the resistance for 4 no. 22 mm elbows at 0.8 m each = 3.2 m. Therefore the maximum permitted length equates

to: 5.8 m.

As 5.8 m is less than the actual length of 7 m therefore calculate the next

largest size.

Maximum resistance allowed for a straight length of 28 mm pipe (D2) from G 1/2” T & P valve equates to: 18 m.

Subtract the resistance for 4 no. 28 mm elbow at 1.0 m each = 4 m. Therefore the maximum permitted length equates

to: 14 m

As the actual length is 7 m, a 28 mm (D2) copper pipe will be satisfactory.

Draining the appliance

The appliance must be drained if left inactive in a room subject to frost and/or in the event of prolonged inactivity.

Typical drain arrangement and system designs will vary:

1. Turn power o to ensure appliance is not operated when empty.

2. Turn o cold supply to appliance.

3. Shut o hot water feed from appliance.

4. Connect hose to drain cock and place other end in sink, basin etc.

5. Open drain cock and open TPR valve to vent cylinder.

How to adjust the temp as it keeps returning to full temp Submitted on 13-8-2022 at 11:02
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Others manual(s) of Ariston Pro 1 Eco

Ariston Pro 1 Eco User Manual - Dutch - 16 pages

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Ariston Pro 1 Eco Manual

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