NuAire B815H/ER/AT-L, Installation, Operation & Maintenance Instructions Manual

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05. 11. 20. Leaflet Number 671829
BOXER BPS ECOSMART ADAPT (TREND) CONTROL (AT)
9
Figure 5: Coil connection sizes.
4.6 WEATHER RESISTANT UNITS
4.7 CONNECTIONS
BPS units are supplied in multiple sections and have weather resistant roof
components that must be fitted and sealed after the unit sections are bolted
together. All necessary fixings are supplied with each unit and are normally
bagged and located within the fan section. Suitable mastic sealant is to be
provided by others.
Where the weatherproof roof assembly of two sections meet, the metal hinged
weatherproof cover strip must be closed to seal the seam between unit sections
and fixed with the bolts provided.
The equipment must not be exposed to the weather in an unassembled or
partially assembled state. All roof terminal, ductwork, sealing and assembly work
must be completed before the unit can be considered weather resistant.
Nuaire do not provide ductwork connections with units, instead the open
ended framework should be utilised. Spigots are available as an option, refer to
technical documents for information relating specifically to the manufactured
unit.
4.7.1 DUCTWORK
4.4 CONDENSATE DRAIN
4.5 THERMAL WHEEL TRANSPORT PACKAGING
Plate heat exchanger components and modules that incorporate cooling coils
may produce condensation during use. An insulated drip tray and condensate
pump is provided where necessary. The drain connection must be connected to a
suitable drainage point.
Condensate pump specification
Maximum flow rate = 50 L/H
Maximum head = 20m Vertical, 100m Horizontal
Pipe Connection size (Low Pressure Condensate connection) = 8 mm
Please note: Thermal wheel transport packing blocks must be removed
prior to operation of the thermal wheel module.
4.7.2 COILS
4.7.3 CONSTANT PRESSURE
When connecting coils, special care is needed to allow for expansion and
contractions. Prior to any equalising connection, ensure that the thermostatic
expansion valve for the DX coil is securely fitted.
Additional care must be taken when using R32 or other flammable
refrigerants: your commissioned system must comply with the
requirements of BS EN 378. Units must be fitted with gas detection systems
(or deploy other suitable control method) to ensure that, in the event of a
refrigerant leak, the Lower Flammability Limit is not exceeded.
Each coil section should be trapped and special care should be taken to ensure
that there are no vertical rising condense lines, unless pumped.
Wet pipe connections sizes are listed in the table below.
When constant pressure mode control is to be used Constant pressure extract
fans are supplied to control the static pressure at the fan inlet. This standard unit
set up is suitable for the majority of applications. However, when high pressure
ancillaries are fitted to the fan’s inlet side, the low pressure tapping must be
moved from the fan chamber, to a location upstream of the ancillaries.
Failure to do this will result in excessive pressure being applied to the dampers at
the rooms when the system is running in trickle mode.
IMPORTANT
If a frost coil is not fitted then appropriate control methods
must be taken to prevent the coils, filters and other
equipment from freezing (by others).
Unit
Size
Frost Coil
(LPHW)
Heating Coil
(LPHW)
Cooling Coil
(CHW)
Flow Return Flow Return Flow Return
05 15 mm 15 mm 15 mm 15 mm 22 mm 22 mm
10 22 mm 22 mm 22 mm 22 mm 22 mm 22 mm
15 22 mm 22 mm 22 mm 22 mm 28 mm 28 mm
20 28 mm 28 mm 28 mm 28 mm 35 mm 35 mm
Care should be taken to ensure that all pipework is adequately supported,
therefore ensuring that no additional weight is added to the unit. Extra
precaution should be taken to prevent pipe damage on site, as the fragile
pipework will protrude from the side of the unit.
4.8 FILTERS
4.8.1 SPARE FILTERS
4.9.2 PANEL & BAG FILTERS WITH SIDE
WITHDRAWAL
Filters will be provided in banks on suitable slide rails, so that they can be
withdrawn.
Magnehelic gauges are available as optional extras.
If specified with order, spare sets of filters will be provided and should be stored
in a clean, dry environment. Should you require spare filter media, please contact
Nuaire.
If specified with order, spare sets of filters will be provided and should be stored
in a clean, dry environment. Should you require spare filter media, please contact
Nuaire.
Figure 6: Typical inter-changeable filters with side withdrawal
4.7.4 PIPEWORK