Labconco Hooded Combination (Macro) Kjeldahl Systems 21178 Series - Manual (Page 8)

Chapter 1: Introduction
Product Service 1-800-522-7658 4
3. Acid Fume Piping Exhaust System. Located on the left side of the unit,
this exhaust piping removes excess sulfuric acid fumes from the digestion
flasks. The Exhaust Piping must be connected to a remote blower to
remove acid fumes. The remote blower creates suction and draws acid
fumes through the CPVC digestion manifold and exhaust piping provided
and pulls the fumes under negative pressure out through a duct work
system connected to the remote blower and ultimately the building’s
exterior. The 6" exhaust stack on the left side of the unit must be
connected to a leak-tight PVC ductwork system that vents 10 ft (3 meters)
above the building roof.
4. Temperature Gauge The condensation rack behind the upper distillation
heating elements requires cooling water. The temperature of the
distillation cooling water can be adjusted to promote condensation and
suit individual requirements with the flow control valve handle, located
below the distillation heaters. Water temperature is indicated on the
thermometer, which is located at the water outlet of the distillation
manifold. The water connections are 3/4" NPT and the supply line should
be 1/2" minimum for proper water flow through the unit. For facilities
where the ground water temperature exceeds 80°F (27°C), a recirculation
water chiller system will be required to achieve sufficient condensation
results.
5. Distillation Condensation Manifold Epoxy coated steel outer columns
with stainless steel inner condensation columns provide long life. Each of
the six column manifold features 3/4" NPT tap water inlet and outlets for
easy plumbing connections.
6. Hood Exhaust Connection At the top of each Hooded Combination
Kjeldahl System are two duct work connection collars. The exhaust collar
is positioned to the right of the make-up air collar. The exhaust collar
must be connected to a dedicated duct work system with a roof mounted
blower. This exhaust connection will vent hot air and small amounts of
acid fumes. The Acid Fume Removal Exhaust duct work system must
not be connected to the Hood Heat Exhaust duct work. Each duct work
system must be routed to the building exterior independently. The make-
up air collar can be connected to a duct work system which can supply up
to 75% of the total exhaust air volume.