Reznor RHC 8000 DJL, Application Instructions

Page: 26 / 36

0710RHC8-JLNLEN 26 / 36
12.0 I
NSTALLATION OF
RHC
UNITS IN
SERIES
12.1 General
12.1.1 Two or three RHC units can be installed in
series. Units can be bolted together using the
pre-punched holes in the duct flanges (see fig.
3 for dimensions B and C). Apply a sealant
between two units in order to avoid air leakage.
12.1.2 Each individual unit requires its own
combustion circuit as described in sections 8.0
& 9.0.
12.1.3 Instructions concerning the burner and controls
section (see section 5.0) must be followed.
The controls sections of the 2 or 3 units in
series can be combined, resulting in one
enclosure.
12.1.4 Perforated inlet plates :
a) 2 units in series :
*At higher airflow conditions (above V2)
(table 8a) the perforated inlet plates are
NOT required and both must be removed.
*For airflow conditions below V2, the RHC
unit at the air inlet side must still have a
perforated inlet plate. The perforated plate
of the second unit must be removed.
b) 3 units in series :
With 3 units in series, the perforated inlet
plates are NOT required. Consequently, all
3 perforated inlet plates must be removed.
12.2 Limitations for use
12.2.1 Minimum airflow requirement through heat
exchanger enclosure : For RHC units, installed
in series, the minimum airflow duty through the
heat exchanger enclosure (see fig. 4 – table 1)
must be observed as indicated in table 8a &
8b.
12.2.2 Maximum airflow through heat exchanger
enclosure : The recommendations as
described in section 4.1.2 are applicable for
RHC units when installed in series. Checking
the possibility of condensation forming within
the tubes must be done (heating section by
heating section), taking into account the
expected minimum inlet temperature and the
heat output conditions for each individual
heating section.
Table 8a
Minimum airflow requirements for 2 RHC
units in series :
Model
V1
(m ³ /h)
V2
(m ³ /h)
2x 8030 06 3750 4400
2x 8045 09 5650 6600
2x 8050 06 6200 7150
2x 8060 12 7500 8750
2x 8075 09 9300 10790
2x 8075 15 9300 11900
2x 8090 18 11200 14300
2x 8100 12 12400 14300
2x 8125M.15 15600 18000
2x 8150M.18 18200 21000
2x 8175M.21 20100 21500
2x 8200M.24 23300 24000
V1 = min. airflow required through heat
exchanger enclosure
V2 = min. airflow required without per-forated
inlet plate
Table 8b
Minimum airflow requirements for 3 RHC
units in series
:
Model
V1
(m ³ /h)
3x 8030 06 5250
3x 8045 09 7850
3x 8050 06 8750
3x 8060 12 10500
3x 8075 09 13000
3x 8075 15 13000
3x 8090 18 15800
3x 8100 09 17000
3x 8125M.15 22000
3x 8150M.18 26000
3x 8175M.21 30000
3x 8200M.24 35000
V1 = min. airflow required through heat
exchanger enclosure
P.S. : no perforated air inlet plate required
12.3 Pressure loss through multiple heating
modules
12.3.1 The charts below (figures 14) indicate the
pressure loss over the heating module
versus the total air volume through the heat
exchanger enclosure (see figure 4 and table
2)
The temperature rise as shown is for 100%
heat output.