Fitting The Appliance; Controlling Central Heating - Benchmark RD 532 combi Installation And Servicing

Condensate Termination and Route
The appliance has a built-in syphonic condensate trap
eliminating the need for external traps. Connect to the
22mm plastic drain pipe and extend the pipe run away
from the control panel and appliance with a constant fall
of 2.5 ° or 25 mm in every metre. See Fig. 12
The condensate pipe can terminate into any of four
areas:
Boiler
Ø 22 min.
Sink
Siphon
No length
75 min. trap
restriction
The gradient of the discharge pipe
Open end of pipe direct
should be 2.5¡ (40 mm/m) minimum
into gully, below ground
but above water level
An internal waste system
Boiler
Internal soil
and vent stack
Ø 22 min.
No length
75 min. trap
restriction
The gradient of the discharge pipe Invert
should be 2.5¡ (40 mm/m) minimum
The rainwater system
Fig. 11
Whilst all of the above methods are acceptable it is
always the best practice to terminate the condense pipe
via an internal waste system.This will eliminate the need
for any external condensate pipe runs which can be sus-
ceptible to freezing in extreme weather.
Fig. 12 Recommended route of the condensate drain
6 720 611 451 GB (03.11)
Boiler
Siphon
Ø 22 min.
Open end of pipe
direct into gully,
Use waterproof pipe work
below ground but
insulation in very exposed
above water level.
positions
The gradient of the discharge pipe should be
2.5¡ (40 mm/m) minimum
An external waste system
Boiler
No length
Sink
restriction
Siphon
Open end of pipe
direct into gully,
Ø 22 min.
75 min. trap
below ground but
above water level
The gradient of the discharge pipe
should be 2.5¡ (40 mm/m) minimum
An external purpose made soakaway
6 720 610 596 -03.2TD
6 720 610 602 - 04.1O
External condensate pipework
The syphonic condensate trap collects condensate into
a trap which releases it in 100 ml quantities. This helps
to prevent the discharge from freezing.
If there is no alternative and the condensate pipe has to
be externally run, the following should be considered:
• The pipe run should take the shortest practical route.
• The pipework should be insulated with weather
resistant insulation.
• The pipe should terminate as close as possible to the
ground or drain, whilst still allowing the condensate
to safely disperse. This would prevent wind blowing
up the pipe.
• The pipework should be installed with the minimum
of horizontal runs and with a downward slope of at
least 2.5 °.
3.7

Fitting the appliance

Benchmark: For optimum performance
after installation, this boiler and its asso-
ciated central heating system must be
flushed in accordance with the guide-
lines given in BS5793:1992 "Treatment
of water in domestic hot water central
heating systems".
Removing the outer case
The outer case is secured against unau-
i
thorised removal by two screws (electrical
safety).Always secure the outer case with
those screws again after refitting.
B Remove retaining screws (1).
B Slide the outer case upwards and then forwards to
remove (2).
B Remove the wall mounting frame manifold kit and the
flue duct connector from the boiler
B Remove the plastic caps from the boiler connections.
2
1
Fig. 13
Installation
15