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26. 01. 22. Document Number 671829
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
BPS H-AT
Installation Manual
14
Fan Plate Access Hatch
15
Sensor Loop Connection
6.5 Condensate Drain
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
6.6 Thermal Wheel Drive / Belt Tension
Thermal wheel modules can be delivered with transport packing blocks,
ensure any transport blocks are removed prior to operation of the
thermal wheel.
The thermal wheel belt is unhooked to prevent the thermal wheel belt
from stretching during transportation.
The thermal wheel motor is attached via a hanging motor bracket. To
install the belt lift the spring motor upwards, hook the belt onto the
pulley and slowly release the motor.
Ensure that the rotation sensor is aligned with the sensing studs,
as this can become misaligned during transport/installation thus
causing a fault signal.
6.7 Weather Resistant Units
The 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.
6.8 Unit Connections
6.8.1 Ducting
Nuaire do not provide ductwork connections with units, instead the
open ended framework should be utilised. Flanged connections are
available as an option, refer to technical documents for information
relating specifically to the manufactured unit.
6.8.2 Coil
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.
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.
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
