0-15pisg (0-100kpa above atm.) at the control valve inlet: size the trap
for twice the full condensate load (coil condensing rate at maximum
design conditions) at 0.5psi (3kpa) pressure differential.
16-30psig (110 to 200kpa above atm.) at the control valve inlet: size
the trap for twice the full condensate load at 2psi (14kpa) pressure.
31psig (210kpa above atm.) and over at the control valve inlet: size the
trap to handle triple the full condensate load at a pressure differential
equal to half the control valve inlet pressure.
The steam supply must be drained of entrained condensate prior to
entering the coil, preferably, just before the regulating valve.
RECUPERATORS
Maintenance
Recuperator units have no moving parts, hence mechanical maintenance is unnecessary.
When dealing with dusty and polluted air, filters should be regularly checked and replaced
when necessary. It is possible to clean the unit with compressed air (in case of dust deposit) or
by spraying it with a detergent solution in case of any greasy deposits.
In order to remove greasy deposits, a water-detergent solution such as DECADE, ND-150
CHEM ZYME, PRIMASEPT, POLY-DET, oakite 86m or similar should be used, following
the manufacturers instructions.
Strongly alkaline or any products that may be aggressive to aluminium should be avoided.
DAMPERS
Installation
When connecting ductwork to dampers take care to ensure that damper casing is not twisted
by ductwork and that fixings do not penetrate cog housing of the damper which will affect the
damper mechanism. Ductwork must be independently supported and should not be left to
hang from the damper. Sealing should be in the form of prestik or neoprene strip.
Ensure actuator rotation is correct in relation to blade location to prevent breaking linkages.
Maintenance
At six (6) month intervals disconnect actuator and check for freedom of movement.
AIR FILTERS
COSHH Regulations
The components of filters are inherently safe, but changing air filters could expose operators
to a „Nuisance Dust‟ hazard. We would therefore recommend that filter changing be carried
out by maintenance personnel wearing simple dust masks, eye protection, overalls or
protective clothing & gloves. Dirty filters should be sealed into plastic bags for disposal.
Disposable Filters
These are supplied in the forms of panel & bag filters and are fitted into steel channel runners.
Filters are simply withdrawn through the access door by sliding the filter along the channel
runner.
Alternatively, bag filters may be retained by thumb screws and clamp bars. Ensure all
screws are loosened before attempting to remove each bag filter.
Filters should generally be
replaced when the pressure drop increases to 0.5”wg
(125pa) above the initial level.
Washable Panel Filters
Generally as per disposable filters except when pressure drop indicates dirty filter conditions,
filters should be fully immersed in warm water to w
h
ich a mild detergent has been added.
Agitate the filter until clean, rinse and allow to dry before replacing.
