5
30. 07. 20. Document Number 671760
Nuaire |
Western Industrial Estate
|
Caerphilly
|
CF83 1NA
|
nuaire.co.uk
BPS V-CO
Installation Manual
4.4 Internal Connections
There are a number of internal connections that need to be completed
prior to starting/commissioning the unit. These consist of all the wiring
connections and the condensate hose (plate heat exchanger option
only).
Please ensure that the condensate hose is connected between modules.
Care must be taken to ensure a constant fall in gradient is maintained
and the hose is kept taught (Figure 5).
Access is available in the fan plate to allow electrical/wiring
connections to be made between modules (Figure 6).
When making the wiring connections, the sensor loop (Figure 7) must
be removed and relocated to the end of the unit.
Unit
Size
Frost Coil
(LPHW)
Heating Coil
(LPHW)
Cooling Coil
(CHW)
Flow
Return
Flow
Return
Flow
Return
07
22 mm
22 mm
35 mm
35 mm
28 mm
28 mm
12
22 mm
22 mm
35 mm
35 mm
28 mm
28 mm
17
22 mm
22 mm
35 mm
35 mm
35 mm
35 mm
22
22 mm
22 mm
35 mm
35 mm
35 mm
35 mm
32
28 mm
28 mm
54 mm
54 mm
42 mm
42 mm
42
35 mm
35 mm
42 mm
42 mm
42 mm
42 mm
4.5 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
4.6 Thermal Wheel Drive / Belt Tension
Thermal wheel belts are untensioned for transport to prevent stretching
during delivery. Ensure the belt has been tensioned prior to operating
the unit by moving the belt drive motor from its transport to operating
position.
4.7 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.
4.8 Unit Connections
4.8.1 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.
4.8.2 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.
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.
5
6
Condensate Hose Connection
Fan Plate Access Hatch
7
Sensor Loop Connection
