Alpha InTec2 20SE Installation And Servicing Instruction page 15

Optional Condensate Trace Heating Kit
An optional Alpha trace heating kit is also available
to prevent the condensate from freezing.
The control of this kit works with a unique patented
design using the boiler PCB to control the trace
heating. The outside weather probe measures the
external temperature, activating the trace heating
cable only when the boiler is in operation and
producing condensate. This feature together with
the latest technology variable resistance heating
cable ensures only a small amount of electrical
energy is used.
If the external temperature drops below 2°C
and the boiler is on, the relay PCB is operated
and voltage is supplied to the trace heating wire
causing it to heat up and prevent the condensate
from freezing. When the outside temperature rises
to 4°C or the boiler pump stops, the trace heater
is switched off. The connection of the outside weather probe supplied with this kit also enables the weather compensation
feature on the boiler.
Plastic pipe
(minimum 32 mm)
22mm termination from boiler, increase to 32 mm if external
Cement mortar sealing
500 mm min.
100mm plastic tube
Bottom of tube sealed
Soakaway depth 400mm
filled with limestone chippings
Fig. 3.8 - External soakaway
Alpha InTec² 20SE and 30SE - General Boiler Information
Minimum gradient 2½°
Fig. 3.7 - External gully
Ground level (either/or)
O
2½ fall
25mm
300mm
Two rows of 3 x 12mm
holes at 25mm centres,
50mm from the bottom
of the tube. Holes to face
away from house.
Use waterproof
pipework insulation
in very exposed
positions
Ensure pipe is
adequately supported
Open end of pipe
diverted into gully
below grid but above
water level
15