Vaillant ecoTEC plus 937 Service Manual download pdf (Page 30)

30 Installation and maintenance instructions ecoTEC plus 937 0020031552_06

5.15 Installing the condensate drain line

Danger!

Risk of poisoning due to an improperly

installed condensate drain line.

Blockages in the condensate drain line may

cause exhaust gas to escape.

Install the condensate drain line in such a

way that blockages are prevented.

Leave an access space of at least 180 mm

underneath the trap.

Danger!

Risk of poisoning from escaping exhaust

gas.

If the appliance is operated with an empty

condensate trap, exhaust gas may escape and

cause poisoning.

Fill the condensate trap with water before

initial operation.

The combi boiler is equipped with a condensate siphon.

(The filling height is 145 mm.) The siphon collects the

condensate in a vessel with a capacity of approx. 200 ml

and feeds the entire contents to the Drain line. This min-

imises the risk of the Drain line freezing up.

Fig. 5.11 Installing the condensate drain line

Connect the condensate drain pipe (1) of the boiler to

a condensate drain line (2) which has a minimum

internal diameter of 19 mm (22 mm outside diameter

for all external pipes) and which is made from an

acid-resistant material (e.g. plastic overflow pipe).

The accessories for the storage tank include

a corrugated hose for draining the conden-

sate.

The drain line connected to the condensate

drain pipe of the combi boiler must have a

constant gradient (45 mm per metre) and

should be installed and terminate within the

building to prevent the possibility of freezing

up.

The condensate drain line must terminate in a suitable

location, e.g.:

a) preferably the drain line should run and termi-

nate internally to the house soil and vent stack

(at least 450 mm above the invert of the stack).

A trap giving a water seal of at least 75 mm (3)

(built into the boiler) should be incorporated

into the pipe run, and there must be an air

break (4) in the drain line upstream of the trap.

The connection to the stack should not be made

in a way that could cause cross flow into any

other branch pipe, or from that branch pipe into

the condensate drainpipe. This can be achieved

by maintaining an offset between branch pipes

of at least 110 mm on a 100 mm diameter stack

and 250 mm on a 150 mm diameter stack.

b) connecting into the internal discharge branch

(e.g. sink waste or washing machine) with an

external termination, the condensate drain line

should have a minimum diameter of 22 mm with

no length restriction and should incorporate a

trap with a 75 mm (3) (built into the boiler)

seal. The connection should preferably be made

down stream of the sink waste trap. If the con-

nection is only possible upstream, then an air

break is needed between the two traps. This is

normally provided by the sink waste.

c) terminating in a gully (5) below grid level (6)

and above the water level. The external pipe

length should be kept as short as possible to

minimise the risk of freezing and should not be

more than 3 m.

d) at a condensate absorption point (soakaway)

(7). The external pipe length should not be

more than 3 m.

Further information can be obtained from "BS 6798

Specification for installation of gas–fired boilers of rated

input not exceeding 70 kW net“. The condensate siphon

must be filled with water as described in Section 6.6

before the combi boiler is commissioned.

5 Sequence of operations during installation

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 79 80

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Vaillant ecoTEC plus 937 Service Manual Page 30

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