11
clean heat technology
4-3
Condensate Drain Arrangement
INST
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INSTALLA
ALLA
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ALLATION GENERAL 4
TION GENERAL 4
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TION GENERAL 4
Extracting heat from the combustion flue gases by cooling in the condenser unit produces
condensation. The condensation is collected and drained from the condensing unit to a
condensate drain connection of the Boiler. see fig. 4-3a and for exact positions section
11-6.
The amount of condensate generated will depend on Boiler size and operating conditions,
this could be up to 2.5 litres per hour.
4-3.1 Condensate Trap
A clear plastic trap is supplied with the boiler complete with fixing screws, spacers and
wall plugs.
A flexible hose 3m x Ø21.5 i.d. x Ø32 o.d. plus clip is also supplied with the Boiler. The
flexible pipe can be used to connect from the Boiler to the Trap and from the Trap to the
discharge pipe. Alternatively standard Ø21.5 plastic overflow pipe and fittings can be
used (not supplied).
The trap provides a 75mm seal.
On floor standing internal Boilers the trap is supplied loose for fitting outside the Boiler
case. It must be fitted inside the property or outhouse and not fitted outside.
Where there is room the trap can be fitted inside the Boiler case.
Fill trap with water before starting the Boiler.
4-3.2 Discharge Pipe
The Boiler condensate drain connection is Ø21.5 (standard overflow pipe).
When installing the condensate drain the following points must be considered:-
1. The discharge should not discharge into a sink, bath, or shower etc.
2. External discharge pipe must be either protected from frost or be of at least Ø32.
3. Horizontal runs must have a fall of 3° or 50mm per metre.
4. The discharge pipe run should be kept as short as possible.
5. The maximum permitted run for external pipe is 3m.
6. Horizontal discharge pipe must be supported at 500mm maximum intervals.
7. Vertical discharge pipe must be supported at 1m maximum intervals.
The condensate discharge drain can be arranged in four ways as shown on the following
illustrations figs. 4-3c, d, e and f.
75
Fig. 4-3c Condensate Drain - Typical Internal Waste System
Ø40 MIN
CONDENSING BOILER
TRAP
FLEXIBLE
HOSE
3° or 50mm/1m FALL
PROPERTY DRAIN SYSTEM
Note
Figures 4-3c, d, e & f show internal floor
standing boilers. The arrangements are
common to all Boilers.
SUPPLIED WITH BOILER - SEE SECTION 11
Ø21.5 PLASTIC OVERFLOW PIPE (NOT SUPPLIED) CAN BE USED
IN PLACE OF FLEXIBLE HOSE
FLEXIBLE
HOSE
HOSE CLIP
PIPE TO FINISH
BELOW GRILL
44444
FLOOR STANDING
WALL MOUNTED
Fig. 4-3a Condensate Drain
CONNECTION Ø21.5
(OVERFLOW PIPE)
Fig. 4-3b Trap
FROM BOILER
FLEXIBLE HOSE OR
Ø21.5 PIPE
TO DISCHARGE PIPE
FLEXIBLE HOSE OR
Ø21.5 PIPE
SLIMLINE
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