Potthof & Co 28kw, 24kw, 33kw manual 7.0Site Requirements, of pipe run, Minimum, fall, metre

Examples are shown of the following methods of termination:-

i)to an internal soil & vent pipe

ii)via an internal discharge branch (e.g. sink waste) downstream of the trap

iii)to a drain or gully

iv)to a purpose made soakaway

v)pumped into an internal discharge branch (e.g. sink waste) downstream of the trap

vi)pumped into an external soil & vent pipe

vii)to a drain or gully with extended external run & trace heating

It is strongly recommended to discharge internally into the household drainage system. If connecting to a rain water drain, that drain MUST discharge into a foul drain.

21.5mm 32mm Insulation

i)Termination to an internal soil and vent pipe

	50mm		per
2.			metre	of pipe run
5°		Minimum
			fall
				450mm min*
					*450mm is applicable to
					properties up to 3 storeys.
					For multi-storey building
					installations consult BS 6798.

	ii) External termination via internal discharge branch
Boiler	e.g sink waste - downstream*

Sink	50mm	per	metre			Pipe must terminate above
	2.			of pipe	run	water level but below
	5°	Minimum		fall		surrounding surface. Cut
						end at 45°

*It is NOT RECOMMENDED to connect upstream of the sink or other waste water receptacle !

7.0Site Requirements

7.7Condensate Drain

FAILURE TO INSTALL THE CONDENSATE DISCHARGE PIPEWORK CORRECTLY WILL AFFECT THE RELIABLE OPERATION OF THE BOILER.

CAREFUL CONSIDERATION MUST BE GIVEN TO THE POSSIBILITY OF THE PIPEWORK BEING SUBJECT TO FREEZING CONDITIONS AND APPROPRIATE MEASURES TAKEN TO PREVENT BLOCKAGE. CORRECT INSTALLATION IN ACCORDANCE WITH THIS SECTION WILL CONSIDERABLY MINIMISE THE LIKELIHOOD OF BLOCKAGE AND SUBSEQUENT BOILER LOCK-OUT.

A CONDENSATE DISCHARGE PUMP AND PIPE ‘TRACE HEATING’ ARE AVAILABLE AS ACCESSORIES - see paragraphs 7.7.12 to 7.715 for further details.

The condensate discharge pipe MUST NOT RISE at any point along its length. There MUST be a fall of AT LEAST 2.5° (50mm per metre) along the entire run EXCEPT when employing a suitable condensate pump in basement and cellar or similar applications.

The boiler condensate trap incorporates a seal of 75mm, therefore it is unnecessary to install an air break and trap in the discharge pipework.

1.The condensate outlet will accept 21.5mm (3/4in) plastic overflow pipe. It is strongly recommended that this discharges internally into the household drainage system. Where this is not possible, discharge into an outside drain is permissible providing every possible precaution is taken to prevent freezing.

2.Ensure the discharge of condensate complies with any

national or local regulations in force. BS 6798 & Part H1 of the Building Regulations give further detailed guidance.

3.The discharge pipe should be run in a proprietary drain pipe material e.g. PVC, PVC-U, ABS, PVC-C or PP.

4.Metal pipework is NOT suitable for use in condensate discharge systems.

5.The pipe should be a minimum of 21.5mm diameter and must be supported using suitably spaced clips of the correct design to prevent sagging.

6.It is advisable that the full length of condensate pipe is run internally and preferably be less than 3 metres.

7.Internal runs greater than 3 metres or runs in cold areas should use 32mm waste pipe.

8.External runs MUST be a MINIMUM of 32mm and fully insulated with material suitable for external use.

9.If the boiler is fitted in an unheated location the entire condensate discharge pipe should be treated as an external run and sized and insulated accordingly.

10.In all cases discharge pipe must be installed to aid disposal of the condensate. To reduce the risk of condensate being trapped, as few bends and fittings as possible should be used and any burrs on cut pipe removed.

© Baxi Heating UK Ltd 2012 17