0710RHC8-JLNLEN
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4.1.3
By-pass
For applications where the air duty exceeds
that required to maintain the criteria stated
above, a parallel by-pass around the heat
exchanger enclosure is required to conduct
the excess air.
Such a by-pass should be designed and
constructed so that the air flow (m³/h) across
the heat exchanger enclosure it-self
maintained between the minimum and
maximum figures as mentioned in section
4.1.1 & 4.1.2. The by-pass is shown in figure
13. We refer also to section 11.0.
4.1.4
Important remark
The air velocity needs to be equal over
the total area of the heat exchanger
enclosure so that even distribution is
achieved over the entire heat exchanger
tube assembly.
Attention :
Special attention is necessary in a push
through system. Baffles and or an air-
stream diverter(s) may be necessary to
ensure an even distribution of the air
flow.
Part or the whole of the tubes may
become damaged or can be the source of
poor combustion if the air velocity as
recommended above is not applied.
5.0 B
URNER
&
CONTROLS SECTION
Warning : the control compartment must be
100% sealed and isolated from the other
compartments or duct work of the air handler –
only combustion air may have access into this
compartment
5.1.
The following conditions must be
observed when applying the heating
module with its burner controls.
5.1.1 An enclosure containing RHC 8000(M)
heating modules shall be so constructed
that it is fully protected against the rigours
of the environment in which it is intended
to operate.
5.1.2 When applied as an RJL (roof top/outdoor
unit) the enclosure into which it is fitted,
must comply with protection grade IP 45.
5.1.3 Access to compartments enclosing the
burner and its controls must be provided
with panels, doors, etc. that are intended
to be opened only by the use of a tool
(key). Such panels must be designed to
ensure that after repeated removal and
replacement their integrity is not
jeopardised, i.e. seals and insulation etc.
remain serviceable.
5.1.4 Openings in ‘RJL’ units from the outside
of the air handler, e.g. gas and electrical
services, shall not be larger than to permit
a ball of 16 mm diameter to pass with a
pressure of 5N.
5.1.5 Dimensions (mm) of control cabinet with
reference to figure 4, the dimensions of
the control cabinet must be in accordance
with table 2.
Warning
Use of RHC 8000(M) heating modules
for purposes other than those described
above could result in severe personal
injury or death and cause property
damage.
The manufacturer warranties are void
if departure from the intended use is
undertaken
.
Warning
This heating module may not be used
where the air handler/heating system in
which it is installed will be used where,
flammable substances/vapours exist or
where
the
atmosphere
contains
chlorinated or haloginated hydrocarbons,
silicones, aluminium oxides, etc.
The manufacturer warranties are void
if these restrictions are not observed
