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Description and Operation
BEACONMEDÆS Anaesthetic Gas Scavenging (AGS) terminal
units are designed to fully comply with BS6834:1987 and
accept probes to the same standard, their installation fully
satisfies the United Kingdom Health Technical
Memorandum’s HTM2022 and HTM02-01. AGS terminal
units are used as outlets to fixed pipeline installations to
supply a maximum flow rate of 130 L/min. with a 1kPa
pressure drop applied and make a connection point
between a suitable receiver unit and disposal system
pipeline. AGS terminal units may be wall mounted, for use
with either surface or concealed pipeline installations or
fitted inside a bed head trunking and pendant assemblies.
Each terminal unit is designed to be fully gas specific, with
gas specific sub-components to prevent inadvertent incorrect
assembly with Medical gas services. The BEACONMEDÆS
AGS terminal units will only accept the correct service
probe, thereby preventing inadvertent operator error. Gem
10 terminal units are clearly identified in accordance with
BS6834:1987 and are subject to comprehensive QA controls
during manufacture with batch numbers allocated to the
assemblies to provide traceability.
Operating Instructions
The probe is attached by pushing in fully home into the
terminal unit and screwing the retaining nut loosely onto
the second fix using hand pressure only. The probe pushes
the valve plug of its seat and allows a flow of gas through the
flow adjustable valve plug. This plug is specifically designed
to provide an adjustable device allowing for fine tuning of
the terminal unit to achieve the correct flow.
Safety Information
WARNING
DO NOT USE OIL OR GREASE ON ANY NIST FOR ANY
REASON! DOING SO COULD LEAD TO A FIRE OR EX-
PLOSION!
Use only approved oxygen compatible lubricants, which can
be purchased from BeaconMedæs if necessary.
Testing
All testing and commissioning should be completed in
accordance with the installation contract.
Installation of Wall and Bed Head Mounted Units
General requirements
Vertically mounted terminal units are installed in the
location and the quantity detailed in the contract
specification, however the following requirements should be
met unless otherwise stated:-
Terminal units shall be located at a height of between
900mm and 1400mm above finished floor level to the centre
line of the terminal unit.
Multi-gas terminal unit installations when vertically
mounted shall be spaced at 135 ± 2.5mm between centres.
The centre of a vertically mounted terminal unit shall be not
less than 200mm from any possible obstruction on either
side.
Wall mounted terminal units shall be housed in either
individual or common (multi-gas) fascia plates.
Vertically mounted terminal units shall be mounted, when
facing the units, in the following order, horizontally from left
to right or vertically from top to bottom: -
O2, N2O, O2/N2O, Medical Air, Surgical Air, CO2, N2, VAC,
AGS.
Installation procedure – surface and concealed
A single gas terminal unit required as a concealed
installation requires a chase 95mm square to a depth of
50mm including plaster depth and a chase suitable for the
15mm downdrop pipe). Surface terminal units are installed
separately and attach directly to the wall. In both cases care
must be taken to ensure that each individual terminal unit
is correctly aligned and square, and correct spacing between
centres must be maintained. Multiple concealed terminal
units are mounted on a multiple gas jig plate, which must
be installed first. The procedure to install a BEACONMEDÆS
AGS terminal unit 1st fix assembly is as follows: -
Single terminal unit (concealed). Chase.
Identify correct location. Accurately chase wall 95mm square
to a depth of 50mm including plaster depth and chase wall
suitable for downdrop pipe. Ensure that chase depth enables
terminal unit to be located squarely.
Single terminal unit (surface and concealed).
Locate backplate. Offer terminal unit to wall, check
location, alignment and correct spacing. Ensure that stub
pipe aligns with downdrop pipe. Mark position of securing
holes (4 - off provided, normally two are sufficient). In the
event that the stub pipe needs shortening do this now using
a wheel cutter. Ensure that ends are square, free from burrs
and re-round as necessary. Ensure that component is clean
and blow through as necessary to remove any particles.
Distribution system. Purge.
Using Medical quality air, purge downdrop pipe and
associated distribution system to remove all particulate
matter prior to fitting terminal unit.
Single terminal unit (surface and concealed). Fit.
Drill wall and fit anchors. Locate backplate, align stub pipe
with downdrop pipe, fit securing screws and tighten.
Multi-terminal units (concealed). Fit.
Locate backplate on multiple gas jig plate securing studs (2
- off). Ensure that stub pipe aligns with downdrop pipe. Fit
