Nortek Reznor RHC DJL 8000, Установка, пусконаладка, обслуживание

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RHC 8000 EN April 2019 D301207 Issue C Page 11
Care should be exercised when designing
ducting systems especially with regard to
the application of restriction and direction
turning fittings, i.e. elbows directly on
to the air heater, doing so can cause an
uneven and turbulent air flow across the
heat exchanger resulting in heat exchanger
spots and nuisance shut down of the gas
burner due to localized overheating, thus
activating thermal over-heat controls.
The location must also provide sufficient
space to allow the heater to be serviced.
Ensure that the air heater is installed in a
level plain and that the surface onto
which it is installed is vibration free.
3.2 Heater Location
• DJL installation :
Do not locate the air heater where it may
be exposed to water spry, rain, etc.
The location chosen for the air heater must
permit the provision of a satisfactory flue
system venting to outdoor atmosphere
and adequately ventilated to provide for
combustion air.
Position mm
Top 150
Flue connector 150
Access panel 600
Non-access side 150
Bottom 50
3.3 Minimum Airflow
Requirement
The minimum airflow duty through the
heating section enclosure (see figure 4)
must be observed as indicated in table 7.
Type m
3
/h m
3
/s
8045 09 5650 1.57
8060 12 7500 2.08
8075 09 9300 2.58
8075 15 9300 2.58
8090 18 11200 3.11
8100 12 12400 3.44
8125M 21 15600 4.33
8150M 18 18200 5.06
8175M 21 20100 5.58
8200M 24 23300 6.48
3.4 Compartment Dimensions
3.5 Maximum Airflow Condition
Special attention must be given to ensure
that the temperature rise of the air, passing
through the enclosure (duct channel)
around the heat exchanger tubes, is high
enough to
avoid condensation forming within the
tubes. This condensation forming could
occur by super cooling of the products of
combustion. Such condensation can be the
source of severe corrosion and damage to
tubes or part of the tubes.
The chart below indicates the probability
of condensation forming within the tubes
reference :
Table 6 - Installation clearances (mm)
Table 7 - Min. air volume required
Figure 4 horizontal airflow