page no. 13 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
1.3.7 Air Distribution System
Where single NVS/F units are required to cover a large floor
area, and in buildings with high roof or ceiling heights
Calecon thermal economiser units should be fitted to
ensure even heat distribution and minimise stratification.
Care should be taken to avoid impeding the air throw with
racking, partitions, plant or machinery etc. Various outlet
configurations are available as optional extras to modify
the air throw pattern to suit particular site conditions.
For ducted units all delivery and return air ducts, including
air filters, jointing and any insulation or lining must be
constructed entirely of materials which will not contribute
to a fire, are of adequate strength and dimensionally stable
for the maximum internal and external temperatures to
which they are to be exposed during commissioning and
normal operation.
Where inter-joist spaces are used as duct routes they
should be suitably lined with a fire-resisting material.
A full and unobstructed return air path to the air heater(s)
must be provided.
If the air heater(s) is installed in a plant room the return air
intake(s) and the warm air outlet(s) from the heater(s) must
be fully ducted, into and out of the plant room to avoid
interference with the operation of the heater.
The openings in the structure of the plant room through
which the ducting passes must be fire stopped.
Care must be taken to ensure that return-air intakes are
kept clear of sources of smells and fumes, and where there
is any possibility of pollution of the air by dust, shavings
etc., precautions must be taken to prevent contamination.
If necessary suitable barrier rails should be provided to
prevent any combustible material being placed within
900mm of the outlets.
Model
Air Volume m³/h Maximum Duct
Resistance Pa
NVS30C
2808
250
NVS60C
5616
250
NVS90C
8424
200
NVS140C
13104
285
1.3.7.1 NVS C Ducting Requirements
NVxCCF heater unit
NVS C
heater unit
0
50
100
150
200
250
Pr
e
ssu
re
D
rop
(Pa)
Air Volume (m³/s)
NVS 90
NVS 60
NVS 30
NVS 140
0
1
2
3
4
5
6
8
7
9
10
11
12
1.3.7.2 NVS D Pressure Drop Across Heat Exchanger
