Reznor RHC 4000 RJL Series User guide

0603RHC4-JLGBEN 1/21
0603RHC4-JLGBEN
Application instructions
RHC 4000(M) RJL
RHC 4000(M) DJL
Jacket-less, Gas fired, Balanced flue, Power vented, Air heater
This document applies when installing into an air handler or as part of
an air handling system
These appliances meet the following EC Directives
Dir. CE/90/396/EEC:GAD
Dir. CE/89/336/EEC:EMC
Dir. CE/73/23/EEC:LVD
Dir. CE/89/392 EEC:MD (annex ll, sub B)
Subject to modifications
Reznor U.K.Limited. – Park Farm Road – Folkestone – Kent - tel [phone] – fax [phone]
®
Please read this document carefully prior to commencing building into an air
handle
r

0603RHC4-JLGBEN 2/21
EC Declaration of incorporation
(Directive 89/392/EEC (annex ll, Sub B)
PROHIBITION TO PUT INTO SERVICE
Reznor Europe N.V.
J & M Sabbestraat 130
B 8930 Menen
Belgium
Herewith declares that:
Power vented gas fired heating battery :
- RHC 4000 series RJL and/or DJL series
- Models 4050 06 4100 12 4150M.18
4060 07 4110M.13 4175M.21
4075 09 4125M.15 4200M.24
Are destined to be incorporated in other machines (air-handlers) and are for
this reason not (entirely) in compliance with the machinery directive
(89/392/EEC as amended 91/368/EEC, 93/444/EEC, 93/68/EEC).
Proper integration into the air-handling systems is required to comply with the
prescribed machinery directive.
Is in conformity with the provisions of the following other EEC directives :
• 90/396/EEC (GAD)
• 73/23/EEC (LVD)
• 89/336/EC (EMC)
The following harmonised standards have been applied:
• EN 60335-1, EN 50165 & EN 1020
E. Dewitte
Approvals and Certifications
Menen 20th March, 2006

0603RHC4-JLGBEN 3/21
INDEX:
DECLARATION STATEMENT
1.0 DEFINITIONS 3
2.0 BASIC INFORMATION 3
3.0 PRACTICAL APPLICATION 5
4.0 LIMITATIONS FOR USE 5
5.0 BURNER & CONTROLS SECTION 7
6.0 GAS CONNECTION 8
7.0 ELECTRICAL EQUIPMENT 8
8.0 COMBUSTION CIRCUIT RHC 4000(M) RJL 11
9.0 COMBUSTION CIRCUIT RHC 4000(M) DJL 11
10.0 PRESSURE DROP INFORMATION 13
11.0 HEATING SECTION WITH BY-PASS CHANNELS 14
12.0 INSTALLATION OF RHC UNITS IN SERIES 17
13.0 INSTALLATION OF AIR FAN IN RESPECT OF THE HEATING COIL 20
14.0 TECHNICAL DATA 21
1.0 DEFINITIONS
1.1 Jacket-less:
A gas-fired air heater supplied as a skeleton
appliance e.g. without case or cover.
1.2 Module:
The jacket-less gas fired air heater.
1.3 Constructor:
The undertaking, which builds a module into
another casing. e.g. an air handler.
1.4 Appliance;
The end product of the constructor
1.5 Compartment:
The section of an appliance into which the
module is installed
1.6 B22 Appliance:
An appliance where the air for combustion is
taken from within the area where the gas
burner is operated.
1.7 C12 Appliance:
An appliance where the air for combustion is
taken from outdoors via a duct terminating
horizontally from the appliance.
1.8 C32 Appliance
An appliance where the air for combustion is
taken from outdoors via a duct terminating
from the appliance vertically.
1.9 Dew point:
The condition, when the temperature is such
that the water vapour in the combustion
products condenses out.
2.0 BASIC INFORMATION
2.1 The instructions contained in this document
apply to the models RHC 4000(M) RJL/DJL
gas fired fan assisted warm air heaters.
2.2 Models RHC 4000(M) RJL are intended for
use in appliances as outdoor (roof top)
systems.
Models RHC 4000(M) DJL are intended for
use in appliances as indoors and must be
used with one of the following flue systems :
B22: vertically (through the roof) or
horizontally (through the wall) flue
system.
C12: Horizontal (through the wall) vented
balanced flue system.
C32: Vertical (through the roof) vented
balanced flue system.
2.3 The gas category for use is II2H3+ (GB & IE)
2.4 All models may only be used when installed
within a closed compartment, e.g. an air
handler.
2.5 Dimensions: we refer to the figures 1,2 & 3.
All dimensions are in mm (25.4mm= 1
inch)
2.6 Installations with C12 & C32 combustion
systems need to be installed with an
appropriate concentric vent terminal as
supplied by your distributor.
Attention
Only recognized air handler manufacturers are
authorized to build-in the heater module. Please
contact your distributor.
$DANGER
ANY OTHER APPLICATION IS FORBIDDEN
AND DANGEROUS. FAILURE TO COMPLY
CAN RESULT IN SEVERE PERSONAL INJURY
OR DEATH AND OR PROPERTY DAMAGE.
Note: Manufacturer warranties do not apply in
such circumstances.

0603RHC4-JLGBEN 4/21
2.7 Dimensions RHC 4000 RJL/DJL RHC 4000(M) RJL/DJL
Figure 1 : Side view
Figure 2 : Top view
Figure 3 : Front view
1.Gas connection ¾”
2.Flue outlet
3.Electrical connection
TYPE A B B1 B2 A1 A2 C C1 E A1 A2 C C1 E
4050 06 531 800 613 187 85 466 224 268 118 85 446 291 268 118
4060 07 601 800 613 187 160 441 224 268 118 85 516 291 268 118
4075 09 741 800 613 187 160 581 224 268 118 85 656 291 268 118
4100 12 950 800 613 187 160 790 224 268 118 85 865 291 268 118
4110M.13 1132 930 778 152 190 942 361 348 188 190 942 364 351 191
4125M.15 1272 930 778 152 190 1082 361 348 188 190 1082 364 351 191
4150M.18 1481 930 778 152 190 1291 361 348 188 190 1291 364 351 191
4175M.21 1691 930 778 152 190 1501 361 348 188 190 1501 364 351 191
4200M.24 1900 930 831 99 139 1761 352 445 179 139 1761 354 447 181
DJL/RJL DJL RJL

0603RHC4-JLGBEN 5/21
Weights (kg) 4050 06 4060 07 4075 09 4100 12 4110M.13 4125M.15 4150M.18 4175M.21 4200M.24
unit 90 100 120 149 200 220 250 279 313
packaging 292929295858585858
total 119 129 149 178 258 278 308 337 371
2.8 Weights
3.0 PRACTICAL APPLICATION
Heat exchanger compartment size.The duct section or air
handler compartment must be sized in accordance with the
dimensions given in table 1 with reference to figure 4.
Mounting flanges on the modules RHC 4000(M)RJL &
DJL allow easy installation.
The heating module may only be fitted as shown in
figure 5.
Alternative orientation is not allowed.
Figure 4. : Compartment dimensions
Table 1 : Dimensions
E = min. dimension
Figure 5 : Installation possibilities for RHC 4000 air heater
modules
4.0 LIMITATIONS FOR USE
4.1 Heat exchanger compartment
4.1.1 Minimum airflow requirement through heat
exchanger enclosure :
RHC 4000(M) RJL & DJL air heaters may be
used for either push or pull through air heaters.
The minimum airflow duty through the heat
exchanger enclosure (see fig. 4 – table 1)
must be observed as indicated in table 2.
HH1 YY2WW1E
4050 06 531 461 1049 975 800 800 400
4060 07 601 531 1049 975 800 800 400
4075 09 741 671 1049 975 800 800 400
4100 12 950 880 1049 975 800 800 400
4110M.13 1132 1062 1049 975 930 930 420
4125M.15 1272 1202 1049 975 930 930 420
4150M.18 1481 1411 1049 975 930 930 420
4175M.21 1691 1621 1049 975 930 930 420
4200M.24 1900 1830 1049 975 930 930 470
Model Duct channel & controls compartment

0603RHC4-JLGBEN 6/21
░
░
░
Heat output Heat output Heat output
100% 100% 50%
1 stage (H1)
(1) 1 stage (H2) (1) 2 stage
m³/h kW m³/h kW kW kW
4050 06 3900 50.00 5950 50.80 24.00 24.00
4060 07 4700 60.00 7150 61.20 28.90 28.90
4075 09 5700 73.75 8800 75.00 36.00 36.00
4100 12 7500 97.00 11700 100.00 47.00 47.00
4110M.13 - - 13600 112.30 51.20 53.80
4125M.15 - - 15600 126.30 51.00 61.20
4150M.18 - - 12300 151.30 75.80 72.50
4175M.21 - - 14100 175.00 99.40 84.70
4200M.24 - - 16300 198.70 99.40 96.40
MODEL V1 V2 Minimum modulating
output
Table 2 : Airflow duty
(1) =see also table 8
H1 = heat output at airflow V1
H2 = heat output at airflow V2
V1 = min. airflow required
through enclosure
V2 = minimum airflow for
high heat output H2
4.1.2 Maximum airflow through heat exchanger
enclosure :
Special attention must be given to ensure that the
temperature rise of the air, passing through the
enclosure 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.
Figure 6 indicates the probability of condensation
forming within the tubes reference :
- the temperature rise of the air through the
enclosure around the tubes (see table 1- fig. 4).
- the inlet air temperature passing over the heat
exchanger
In function of the expected minimum inlet air
temperature, the minimum required temperature
rise (to avoid condensation) must be derived from
the chart shown in figure 6.
Example :
• expected minimum inlet temperature = -5°C
• minimum required temperature rise shown on
the chart = +13°K
Table 2 indicates the heat output (kW) of the
different models.
The maximum allowable airflow [through the enclosure
(duct channel) around the tubes]can be calculated as
follows :
Example :
△Tmin = 13K (with min. inlet temp. = -5°C)
model 4075 09 at 100% heat output : 75,00kW results
into Vmax ≈16854m³/h
Remark :
For air heaters with the option 2 stage gas valve (50%
minimum heat input) or the option modulating gas valve
(30% minimum heat input) attention must be given to
determine the maximum allowable airflow in function of
the appropriate heat input.
Example :
△Tmin = 13K (with min. inlet temp. = -5°C)
model 4075 09 at 50% modulation (see table 2 ‘output’) :
36kW
results into
Figure 6 :
Dew-point occurrence
chart (condensation
zone)
0.3423
minimum
T1000(kW)putheat
(m³/h)
max
V×
×
=
∆
out
h/³m8090=
×
×
=0.342313 100036(kW)
max
V
20°C
0°C
-20°C

0603RHC4-JLGBEN 7/21
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 BURNER & 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 4000 (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 1.
Caution :Alterations to the burner and/or its controls,
any other electrical apparatus supplied as part of the
heating module or changing of the settings as supplied
is strictly forbidden. To do so is in contravention of the
E.C. gas appliance directive.
5.1.6 Thermal insulation used in the construction of
a heating module enclosure shall maintain its
insulating properties under the influence of
heat mechanical stress and ageing, it shall be
non- combustible and resistant against vermin.
Ensure that any insulation is securely fixed
and will not obstruct combustion air pathways.
Asbestos or materials containing asbestos
may not be used. All materials used in
association with RHC 4000 modules must be
in accordance with the combustibility
requirements of ISO 1182.
5.1.7 Where appliances containing RHC 4000(M)
DJL modules are intended to be suspended at
a height of 1,8 m above floor level, doors,
panels etc. intended to be removed for
servicing shall be provided with hinges, or
restraining devices to prevent falling from
above during servicing. Access panels must
be readily capable of correct and easy
removal and assembly, this feature is
particularly appropriate to square dimensioned
elements.
NOTE:
Provision must be made to view the burner to ensure its
operation under normal operating conditions. Viewing
ports may be necessary. Ensure no flammable
substances are in the immediate environment of the
heating module.
.
WARNING :
• Use of RHC 4000 (M) heating modules fo
r
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.
• 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

0603RHC4-JLGBEN 8/21
6.0 GAS CONNECTION
Rc ¾ or Rc 1 ¼ for M units
6.1.1 National requirements and regulations for the
installation of gas must be respected for all
countries into which the appliance is delivered.
Gas connections may only be carried out by
appropriately qualified persons.
6.1.2 Clearances around connections shall be
adequate so as to afford access to allow the use
of tools to connect and disconnect the gas service
connections.
6.1.3 Threads used for gas pipes and fittings shall
comply with ISO 7.1.
6.1.4 Copper pipes and fittings may not be used. Solder
which has a melting point of less than 450o C
neither solder or alloys containing cadmium shall
not be used.
6.1.5 All gas services to the heating module shall be
equipped with an isolation tap which shall be of
the 90oturn type and shall be provided with a
positive stop and it should be fitted adjacent to the
heating module. Such taps when installed in a
vertical position shall be such that in the event of
a falling handle the valve will be in the closed
condition, the open and closed positing shall be
readily distinguishable. The valve shall be easy to
operate when required.
Attention :
All passages for gas pipes, etc … to the control
department must be completely sealed !
7.0 ELECTRICAL EQUIPMENT
WARNING : Ensure that when installing electrical
wiring or cables no contact is made with the burner,
heat exchanger or flue arrangement.
Cables or wires must be securely fixed so that they
cannot move. To protect supply cables as good as
possible we recommend to install them at the left
side of the control compartment.
7.1.1 The RHC 4000(M) heating module has been fully
tested prior to leaving the manufacturer. The
constructor shall not make changes to the wiring
supplied with the module. Electrical connections
may only be made using the terminals provided
and strictly in accordance with wiring diagram
provided with the module.
7.1.2 RHC 4000(M) electrical controls are phase
sensitive 230V 1N 50 Hz. The appliance must be
earthed after the installation has been completed
and earth continuity test must be carried out.
7.1.3 The electrical equipment of the module complies
with the requirements of: EN 60335-1, EN60730-1
and EN61058-1 or to relevant amendments. The
constructor must also comply with these
requirements when fitting the module.
7.1.4 The protection of jacketless appliances
conforms to protection code IP 20. The
constructor must ensure that protection
accordingly to at least IP 45 is fulfilled and mark
his data/rating plate accordingly.
Note: IP 45 provides:
a) Personal protection against contact with
electrical components within the
construction;
b) Degree of protection within the
construction against ingress of water.
7.1.5 The constructor shall test and inspect fully the
total appliance prior to supply including the
following:
a) Earth continuity (re: CENELEC 289)
b) Di-electric strain (re: CENELEC 289)
c) Function of all electrical components and
securities and operational inspection
d) Heat input and test for good and clean
combustion
e) Auxiliary equipment to be supplied as part
of the appliance
f) Soundness of the total gas circuit
Attention :
All passages for gas pipes, etc to the
control compartment must be completely
sealed !
8.0 COMBUSTION CIRCUIT
RHC 4000(M) RJL ‘OUTDOOR’
8.1.1 Inlets for combustion air and flue outlets shall
be so designed so that when an appliance is
finally installed their termination shall be at least
500mm above deck/ground level.
8.1.2 The heating modules are delivered with all
parts necessary for the construction of the
jacket so that combustion can take place safely
and in line with the Gas Appliance Directive.
Included with the heating module RHC 4000 :
- Dia 100 terminal outlet (length 300mm)
(PN°60 50712 300)
- 90° elbow with sealing ring (dia 100)
(PN 60 50733 100)
- Flue outlet combustion sealing ring (dia 100)
(PN 06 22786 104)
- Combustion air inlet protection grill (PN 90
79050)
- Gas tube sealing ring (PN 06 22783 125)
Included with the heating module RHC 4000M:
- Dia 130 terminal outlet (length 282mm)
(PN°60 50712 130282)
- 90° elbow with sealing ring (dia 130)
(PN 60 50786 134)
- Flue outlet combustion sealing ring (dia 130)
(PN 06 22786 104)
- Combustion air inlet protection grill (PN 90
79050)
- Gas tube sealing ring (PN 06 22783 054).

0603RHC4-JLGBEN 9/21
The 90° elbow, sealing ring, terminal and the
combustion air inlet protection grill must be installed
according to figure 7.
All sealings must be correctly placed in the tubes to
avoid flowing back of combustion products to the
burner.
As indicated, the combustion air inlet protection grill
(PN 90 79050) must be integrated in the side panel of
the controls compartment. The dimensions of the
required opening in this side panel and its position
relative to the mounting flange of the RHC 4000(M)
RJL heat exchanger enclosure are indicated in figure
8 & 9.
The air inlet protection grill must be installed in a level
plane and horizontally centred.
The minimum and maximum distances between the
axis of the flue outlet pipe and the top of the
combustion inlet grill are indicated in figure 9.
Ensure the combustion inlet grill at the control door
panel is completely sealed to prevent ingress of
water.
It is forbidden to use the combustion inlet grill as
passage for cables or gas supplies. Ensure the
inlet grill openings are not obstructed.
Make sure the installation of the combustion inlet
grill is securely fixed.
The outlet combustion sealing ring (dia 100 or 130)
(PNs 06 22786 104 or 06 22786 134) must be
installed in the fixed outlet panel of the air handler
in a hole with dia 112mm for dia 100mm outlet or
with hole diat dia 142mm for dia 130mm outlet.
This hole must be located in the axis of the 90° flue
outlet elbow with a sealing ring of the RHC
4000(M) RJL (see drawing figure 9). The sealing
ring provided, fits for 1mm thick panels.
Figure 7. :General arrangement combustion air inlet and flue products outlet for RHC 4000(M) RJL units
Figure 8
* PN combustion air inlet protection grill : 90 79050
Assure the sealing of the combustion air inlet grill to the controls
compartment side panel is water tight

0603RHC4-JLGBEN 10/21
Figure 9: Controls compartment (side) panel for RHC 4000(M) RJL units
8.1.3 The terminal outlet (PN 60 50712 300 or 60 50712
130282) of thick wall aluminium pipe supplied must
be fitted in a horizontal plane and be placed so as
to fit exactly between the elbow on the combustion
fan and the outlet terminal hole with sealing ring.
If required this terminal outlet must be cut to length
in order to respect the dimension 75.0mm (fig. 8).
However, when the depth of the control
compartment exceeds the value E indicated in
table 1, a seamless duct ∅100 or ∅130 (for the M
range) of thick wall aluminium and a sealing ring
are to be used to extend the length of the terminal
outlet. The absolute maximum allowable
extension to the protection cap (standard length
300mm) is 700mm.
8.1.4. Attention must be given to properly seal the
controls compartment from the enclosure for the
main air stream (duct channel).
This sealing should be appropriate to avoid any
leakage of air from controls compartment into the
duct channel and vice versa.
Note : Flue arrangements other than those
described and supplied with the heating
module are not permitted.
8.1.5 A gas service inlet (PVC) sealing ring is also
provided for the appliance for size RC ¾.
The hole size required for the seal ring in the
casing is 50 mm diameter. The provided sealing
ring fits for 1mm thick panels.
All cables and wires passing through the casing of
the burner/controls section should be via strain
relief bushings.
It is recommended that sealing is accomplished by
the use of the sealed ring type.
Connections between the burner module controls
compartment must be effectively sealed from the
appliance air-stream so the pressure within the
compartment remains neutral.
9.0 COMBUSTION SYSTEM
RHC 4000(M) DJL ‘INDOOR’
9.1.1 The DJL Modules are provided with flue outlets
sized dia 130mm.:
9.1.2 If the DJL model is to be installed as a room
sealed type C12 or C32 appliance, the burner
and controls cabinet must be sealed so as to
ensure air leakage does not exceed that stated
in table 4.
9.1.3 The heating modules are delivered with all parts
necessary to properly seal the combustion
circuit.
Included with the heating module are:
- 90° elbow with sealing ring
PN 60 50733 130 (dia 130)
- gas tube sealing ring
(PN 06 22783 125 or 06 22786 054 (M units)
- 2 ‘teflon’ sealing rings
PN 06 22786 134 (dia 130)
- set of restriction rings (only for 4000M units!)
as per table 3a.
Table 3a
Model Dia (mm) Qty
4110M.13 90, 93, 96, 99, 107 5
4125M.15 86, 90, 93, 95, 107 5
4150M.18 90, 93, 95, 99 4
4175M.21 90, 95, 99, 107 4
4200M.24 92, 97, 102, 114 4
9.1.4 Use of flue restriction rings (only for 4000M
models). To assure the efficieny of the M units
eventually a flue restriction ring needs to be
fitted in the outlet collar of the venter housing
(see fig. 11a). The diameter of the restriction
ring will be determined by the flue length as
indicated in table 3b.
Opening
required to
fit
combustion
air inlet grill
Hole (dia 112mm or
142mm required to
receive seal ring (PN
06 22786 104 or 06
22786 134)
Hole (dia 50mm or 67mm)
required to receive gas
passage grommet vinyl
(PN 06 22783 125 or
06 22786 054)
Type
RHC 4000 158 (1) 558 (2) 225 (1) 405 (2)
RHC 4110M.13
RHC 4125M.15
RHC 4150M.18
RHC 4175M.21
RHC 4200M.24
404
453
B (mm)
485
574
A (mm)
610
610
610
610
663
191
(1) = minimum (2) = maximum

0603RHC4-JLGBEN 11/21
Combustion out and inlet application 4110M.13 4125M,15 4150M.18 4175M.21 4200M.24
2X1m pipe length till 2X3m pipe length 99mm 95mm 93mm 95mm 102mm
2X4m pipe length till 2X6m pipe length 107mm 107mm 99mm 107mm 114mm
2X7m pipe length till 2X9m pipe length open open open open open
1X1m pipe length till 1X3m pipe length 90mm 86mm 90mm 90mm 92mm
1X4m pipe length till 1X6m pipe length 93mm 90mm 93mm 95mm 97mm
1X7m pipe length till 1X9m pipe length 96mm 93mm 95mm 99mm 102mm
C Appliance
B appliance
As shown in figure 11a the sealing rings must be
fitted in the outer casing to properly seal around
the combustion air inlet pipe and the flue outlet
pipe. The centre distance between the pipes must
be respected as per table 5 and the flue outlet
must always be above the combustion air inlet.
Figure 11b indicates the hole size required (as
shown in table 5) in the outer casing and the
position of these holes relative to the mounting
flange of the RHC 4000(M) DJL heating module.
9.1.5 The combustion air inlet duct must not pass
through the cabinet panel by more than 50 mm.
9.1.6 When the DJL model is to be used as a type B22
appliance i.e. combustion air being taken from the
space to be heated, a protection grille complying
with IP 20 must be installed at the inlet point of the
cabinet (see figure 10).
9.1.7 Attention must be given to properly seal the
mounting flange of the heating module (see figure
9).
9.1.8 A gas service inlet (PVC) sealing ring is also
provided for the appliance for size Rc ¾ or Rc 1
¼ for the M models. The hole size required for
this seal ring in the casing is 50 mm diameter.
All cables and wires passing through the casing
of the burner/controls section should be via
strain relief bushings. It is recommended that
sealing is accomplished by the use of the sealed
ring type. Connections between the burner
module controls compartment must be
effectively
sealed from the appliance air-stream so the
pressure within the compartment remains
neutral.
9.1.9 A viewing port for the purpose of ascertaining
the operation of the burner should be included.
The viewing port may be located behind a door
or panel provided that when the door or panel is
opened the combustion circuit remains in its
“sealed” condition so that burner operation is
not upset.
Table 3b : Diameter flue restrictors for DJL
Table 4 : Maximum cabinet air leakage rates Table 5 : Centre distances combustion air inlet flue outlet
Heat input Allowed
gross leakage
kW m3/h @ 50Pa
4050 06 62.00 25.00
4060 07 74.00 25.00
4075 09 92.50 25.00
4100 12 120.00 25.00
4110M.13 136,60 25.00
4125M.15 153,47 25.00
4150M.18 182,91 25.00
4175M.21 211,76 25.00
4200M.24 240,62 25.00
Model Connection Centre Cabinet hole
Ø distance B size required
(mm) (mm)
f
or
sealing ring (mm)
4050 06 130 225 142
4060 07 130 225 142
4075 09 130 225 142
4100 12 130 225 142
4110M.13 130 225 142
4125M.15 130 225 142
4150M.18 130 225 142
4175M.21 130 225 142
4200M.24 130 225 142
Model

0603RHC4-JLGBEN 12/21
Figure 10: Arrangement for class B22 appliance Figure 11a : Combustion air inlet – outlet dimension requirements
Figure 11b : Combustion air inlet – outlet dimension requirements
Attention :
Poor combustion leading to a hazardous situation can result from either positive or negative pressures within the
combustion circuit.
Hole (dia 142mm) required to receive seal ring (PN
06 22786 134
)
Hole (dia 142mm) required to receive seal
ring (PN 06 22786 134)
Hole (dia 50 or 70mm) required to receive gas passage grommet vinyl Rc 3/4” or Rc 1
¼”(PN 06 22783 125 or 06 22783 054)
1 Combustion air inlet pipe (*)
2 Flue outlet pipe (*)
3 Teflon sealing ring
4 90° bend
5 Gas passage grommet vinly Rc ¾” or
Rc 1 ¼”(PN 06 22783 125 or 06
22783 054)
(*) Not delivered with the unit
Eventually flue restrictor ring in
outlet collar venter housing

0603RHC4-JLGBEN 13/21
10.0 PRESSURE LOSS THROUGH HEATING MODULE
10.1 The chart below indicates the pressure drop
over the heating module versus the air flow
volume through the heat exchanger enclosure
(see fig. 4 and table 1).
10.2 The temperature rise (△T) shown is for 100%
heat output.
Figure 12a :
Figure 12b :
Pressure losses through a RHC 4000 heating module
7500 m³/h5700 m³/h
4700 m³/h
3900 m³/h
0
50
100
150
200
250
300
350
400
450
500
3000 7000 11000 15000 19000 23000 27000
Airflow (m³/h) through the heat xchanger enclosure
Pressure loss (Pa)
RHC4100-12
RHC4075-09
RHC4060-07
RHC4050-06
38 34 30 27 24 22 20 18 17 16 15 14 13 12 11
1112131438 34 32 30 28 262524 23 22 21 20 19 18 17 16 15 ∆T RHC4100-12
111213143835 3230 28 26 24 22 20 19 18 17 16 15 ∆T RHC4075-09
∆T RHC4050-06
1112131415161719212338 262933
∆T RHC4060-07
Pressure losses through a RHC 4000 heating module
100
150
200
250
300
350
400
450
500
13000 15000 17000 19000 21000 23000 25000 27000
airflow (m³/h)
pressure drop (Pa)
RHC 4110M
RHC 4125M
1415
1617
18
1920
21
23 2224
24 14
15
1617
1819
20
21
22
23
∆T RHC 4125M
∆T RHC 4110M

0603RHC4-JLGBEN 14/21
Figure 12c :
11.0 HEATING SECTION WITH BY-PASS CHANNEL
11.1 By-pass requirements
11.1.1 Referring to section 4.1.3, a by-pass duct in
parallel with the heat exchanger enclosure
might be required.
11.1.2 Such by-pass duct might also be required to
reduce the pressure loss over the heating
section, particularly at higher airflows.
11.1.3 When a by-pass duct is applied, a portion of the
total airflow is guided through the by-pass duct
and the remaining airflow is guided through the
heat exchanger enclosure.
11.1.4 The by-pass duct dimensions must be properly
determined in order to ensure that the airflow
through the heat exchanger enclosure always
meets the minimum airflow requirements as
mentioned in table 6.
Table 6
V1 = minimum. airflow required through heat exchanger
enclosure
V2 = minimum airflow required for high heat output H2
pressure losses through a RHC 4000 heating module
0
50
100
150
200
250
300
350
400
450
500
10000 15000 20000 25000 30000 35000 40000 45000 50000 55000 60000
airflow (m³/h)
pressure drop (Pa)
RHC 4150M
RHC 4175M
RHC 4200M
35 30 1620 1822 11
1213141525 ∆T RHC 4150M
35 30 25 11121314
15
1617182022 ∆T RHC 4175M
35 30 2225 20 18 16 15 14 13 1112
∆T RHC 4200M
V1 V2
(m³/h) (m³/h)
4050 06 3900 5950
4060 07 4700 7150
4075 09 5700 8800
4100 12 7500 11700
4110M.13 --- 13600
4125M.15 --- 15600
4150M.18 --- 12300
4175M.21 --- 14100
4200M.24 --- 16300
Model

0603RHC4-JLGBEN 15/21
11.2 Calculation of recommended maximum by-
pass
The calculation can be made for all airflows
above V1, the minimum airflow.
When the high heat output H2 is required, then
the calculation should be made reflected on V2.
This is only possible for airflow conditions
above V2.
The by-pass can either be mounted on top of the
heat exchanger or besides the heat exchanger as
shown in figure 13.
The recommended maximum by-pass dimensions
for a given air flow (Vtot) can be calculated as
follows : (Vtot is the air flow expressed in m³/s).
By-pass besides heat exchanger By-pass on top of heat exchanger
►Dimension C (mm) = R1 x Vtot + R2 4Dimension A (mm) = R1 x Vtot + R2
EXAMPLES :
Example 1 : RHC 4075 09 RJL
with :
- total air flow = 3.61m³/s = 13000 m³/h
- by-pass besides heat exchanger
- calculation for heat output H1
Result :
- dimension B = 670.50mm
- dimension X = 800mm
- R1 = 206.50
- R2 = -319.20
- dimension C = 206.50 x 3.61 – 319.20
4C = 426.50mm
Note :In this case 1.58m³/s (= 5700m³/h) flows
through the heat exchanger enclosure. The
remaining 2.03m³/s (=7300m³/h) flows through the
by-pass duct
(3.61m³/s – 1.58m³/s = 2.03m³/s)
Example 2 : RHC 4075 09 RJL
with :
- total air flow = 3.61m³/s = 13000 m³/h
- by-pass besides heat exchanger
- calculation for heat output H2
Result :
- dimension B = 670.50mm
- dimension X = 800mm
- R1 = 138.20
- R2 = -334.60
- dimension C = 136.20 x 3.61 – 334.60
4C = 164.30mm
Note :In this case 2.44m³/s (= 8800m³/h) flows
through the heat exchanger enclosure. The
remaining 1.17m³/s (=4200m³/h) flows through the
by-pass duct
(3.61m³/s – 2.44m³/s = 1.17m³/s)
Model dim. D (mm) factor R1 factor R2
4050 06 975.00 136.80 -148.20
4060 07 975.00 135.70 -169.50
4075 09 975.00 141.80 -219.30
4100 12 975.00 135.40 -275.40
4110M.13 - - -
4125M.15 - - -
4150M.18 - - -
4175M.21 - - -
4200M.24 - - -
Model dim. D (mm) factor R1 factor R2
4050 06 975.00 89.60 -148.20
4060 07 975.00 93.20 -183.10
4075 09 975.00 95.00 -229.90
4100 12 975.00 90.00 -289.70
4110M.13 975.00 62.50 -225.00
4125M.15 975.00 65.20 -279.35
4150M.18 975.00 131.60 -446.00
4175M.21 975.00 137.50 -547.50
4200M.24 975.00 135.40 -620.80
For heat output H1 (V > V1)
For heat output H2 (V > V2)
Model dim. B (mm) factor R1 factor R2
4050 06 461.00 289.30 -313.40
4060 07 531.00 250.60 -315.20
4075 09 670.50 206.50 -319.20
4100 12 880.00 150.00 -305.20
4110M.13 - - -
4125M.15 - - -
4150M.18 - - -
4175M.21 - - -
4200M.24 - - -
Model dim. D (mm) factor R1 factor R2
4050 06 461.00 189.70 -313.40
4060 07 531.00 174.40 -336.30
4075 09 670.50 138.20 -334.60
4100 12 880.00 99.70 -321.00
4110M.13 1062.00 58.80 -216.20
4125M.15 1202.00 54.30 -239.10
4150M.18 1412.00 88.20 -291.20
4175M.21 1621.00 80.00 -306.00
4200M.24 1830.00 70.00 -312.00
For heat output H1 (V > V1)
For heat output H2 (V > V2)

0603RHC4-JLGBEN 16/21
11
1
2+
⎟
⎠
⎞
⎜
⎝
⎛−×
=
VR
V
x
xV
Vtot
tot
HS
)/³7413(/³.2
11
.1
.3
.426
250
.3 06
58
61
50
61 hmsmVHS =
+
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛−×
=
Example 3 : RHC 4075 09 RJL
with :
- total air flow = 1.94m³/s = 7000 m³/h
- by-pass besides heat exchanger
- calculation for heat output H1
Result :
- dimension B = 670.50mm
- dimension X = 800mm (see fig. 13)
- R1 = 206.50
- R2 = -319.20
- dimension C = 206.50 x 1.94 – 319.20
4C = 81.40mm
Note
In this case 1.58m³/s (= 5700m³/h) flows through
the heat exchanger enclosure. The remaining
0.36m³/s (=1300m³/h) flows through the by-pass
duct
(1.94m³/s – 1.58m³/s = 0.36m³/s)
Example 4 : RHC 4075 09 RJL
with :
- total air flow = 1.94m³/s = 7000 m³/h
- by-pass besides heat exchanger
- calculation for heat output H2
This is impossible because the total airflow (=
7000m³/h) is less than the minimum required
airflow V2 for heat output H2.
Pressure loss :
In this case the total pressure loss over the RHC
module with by-pass can be extracted from
figures 12a/b/c. The airflow through the heat
exchanger enclosure must be applied to
determine the total pressure drop.
Example 1 :
- Airflow through the heat exchanger
enclosure = 2.58 m³/s (5700 m³/h)
- Total pressure drop = 40 Pa (approx.)
Example 2 :
- Airflow through the heat exchanger
enclosure = 2.44 m³/s (8800 m³/h)
- Total pressure drop = 90 Pa (approx.)
11.3 Calculation of alternative by-pass dimension
Due to space restrictions it may not be possible
to use the above mentioned maximum dimension
by-pass.
In this case a smaller by-pass can be applied.
Obviously, this smaller by-pass will result in
higher portion of the total air flow through the
heat exchanger enclosure and
consequently in a higher total pressure
drop
To calculate this air flow through the heat
exchanger enclosure, following interpolation
rule should be applied :
With :
- VR = Recommended air flow
(Table 7) (m³/s)
- Vtot = Total air flow (m³/s)
- x1 = Recommended by-pass (dim
A or C) (as calculated in
section 11.1).
- x2 = Applied by-pass dim. (mm)
Then VHS (air flow through heat
exchanger enclosure) can be calculated
as :
As explained, the air flow VHS through the
heat exchanger enclosure must be used in
figure 12 to extract the correct total pressure
drop over the RHC module with by-pass.
The air flow VHS may not exceed the
maximum airflow allowed according to
section 4.1.2 to avoid supercooling ot the flue
gases.
EXAMPLE .
RHC 4075 09 RJL
with :
- Total air flow : 3.61m³/s (13000m³/h)
- Expected min. inlet temperature : -5°C
- Recommended max. dim C = 426.50mm
(see example 1)
- Dimension X = 800mm
- Applied by-pass dim. C = 250mm
Then :
- x1 = 426.50mm
- x2 = 250mm
- Vtot = 3.61m³/s
- VR = 1.58m³/s (5700m³/h)
Result :

0603RHC4-JLGBEN 17/21
Consequently, 2.06m³/s (7413 m³/h) flows through the
heat exchanger enclosure and the remaining 1.55m³/s
(=5587m³/h) (= 3.61m³/s – 2.06m³/s) flows through
the by-pass channel.
From section 4.1.2 the maximum allowable airflow
through the heating module enclosure is 23979 m³/h
(for this example).
We notice the 7413m³/h is still below this maximum
allowable figure. Consequently there is no probability
of condensation forming within the tubes.
Pressure drop :
The total pressure drop can be derived from figure 12.
Use the air flow through the heat exhanger enclosure
to determine the total pressure drop. (@7413 m³/h)
Result : 70Pa (approx)
Figure 13a
Figure 13b
12.0 Installation of RHC
units in series
12.1 General
12.1.1 Two RHC 4000(M) 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 units in series
can be combined, resulting in one 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.
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 7.
12.2.2 Maximum airflow through heat exchanger
enclosure :
12.3 Pressure loss through multiple heating
modules
The charts below (figures 14) indicates the
pressure loss over the heating module versus
the total air volume through the heat exchanger
enclosure (see figure 4 and table 1). The
temperature rise (△T) as shown is for 100%
heat output.
Table 7 :Minimum airflow requirements for 2 RHC
units in series :
Model V (m³/h) Model V (m³/h)
2x 4050-06 5950 2x 4110M,13 13600
2x 4060-07 7150 2x 4125M,15 15600
2x 4075-09 8800 2x 4150M,18 17500
2x 4100-12 11700 2x 4175M,21 20600
2x4200M,24 23300
V = min. airflow required through heat exchanger
enclosure

0603RHC4-JLGBEN 18/21
Pressure losses through 2 RHC4000 heating modules in series
11700 m³/h
8800 m³/h
7150 m³/h
5950 m³/h
0
100
200
300
400
500
600
700
800
5000 7500 10000 12500 15000 17500 20000 22500 25000
Airflow (m³/h) through the heat exchanger enclosure
Pressure loss (Pa)
2x RHC4100-12
2x RHC4075-09
2x RHC4060-07
2x RHC4050-06
232425262728293031323334353638404244464850
50 2324252627282930323436384042444648
232425262728303234363841444750
∆T 2x RHC4100-12
∆T 2x RHC4075-09
∆T 2x RHC4050-06
232425262728303234363841444750 ∆T 2x RHC4060-07
Pressure losses through 2 RHC 4000M heating modules in series
300
350
400
450
500
550
600
650
700
750
800
12000 14000 16000 18000 20000 22000 24000
airflow (m³/h)
Pressure drop (Pa)
2 x RHC4110M
2 x RHC 4125M
4243 38 37 36 3539 3132
33
34
47 45 44 41 40 ∆T 2 x RHC 4110M
31
3233343536
37
3839404142
43
46 44
∆T 2 x RHC 4125M
Pressure losses through 2 RHC 4000M heating modules in series
100
200
300
400
500
600
700
800
15000 20000 25000 30000 35000 40000 45000 50000
airflow (m³/h)
pressure drop (Pa)
2 x RHC4150M
2 x RHC4175M
2 x RHC4200M
30 27 25 23
35
40
50 45
∆T 2 x RHC 4150M
284550 40 36 33 30 26 24
∆T 2 x RHC 4175M
50 45 40 36 33 28 24
30 26
∆T 2 x RHC 4200M
Pressure drop for 2 units in series
Figure 14a
Figure 14b
Figure 14c

0603RHC4-JLGBEN 19/21
11
2
1
2+
⎟
⎠
⎞
⎜
⎝
⎛−×
=
V
V
x
xV
Vtot
tot
HS
12.4 Multiple heating sections in series with by-
pass channels
12.4.1 By-pass requirements :
* Referring to section 4.1.3, a by-pass duct in
parallel with the heat exchanger enclosure
might be required.
* Such by-pass duct might also be required to
reduce the pressure loss over the heating
section, particularly at higher airflows.
* When a by-pass duct is applied, a portion of
the total airflow is guided through the by-
pass duct and the remaining airflow is guided
through the heat exchanger enclosure.
* The by-pass duct dimensions must be
properly determined in order to ensure that
the airflow through the heat exchanger
enclosure always meets the minimum airflow
requirements as mentioned in table 7.
12.4.2 Calculation of recommended maximum by-
pass for 2 units in series:
This calculation is applicable for total airflow
conditions above V (table 7).
The by-pass can either be mounted on top of
the heat exchanger or besides the heat
exchanger as shown in figure 13.
The recommended maximum by-pass dimensions
for a given air flow (Vtot) can be calculated as
follows : (Vtot is the air flow expressed in m³/s).
By-pass besides heat exchanger :
►Dimension C (mm) = R1 x Vtot + R2
By-pass on top of heat exchanger :
4Dimension A (mm) = R1 x Vtot + R2
12.4.3Calculation of alternative by-pass dimension :
Due to space restrictions it may not be possible
to use the above mentioned maximum
dimension by-pass.
In this case a smaller by-pass can be applied.
Obviously, this smaller by-pass will result in a
higher portion of the total airflow through the
heat exchanger enclosure and consequently in
a higher total pressure drop
To calculate this air flow through the heat
exchanger enclosure, following inter-
polation rule should be applied :
With :
V = Recommended air flow
(Table 7) (m³/s)
Vtot
= Total air flow (m³/s)
x1= Recommended by-pass (dim
A or C) (as calculated in section
11.1).
x2= Applied by-pass dim. (mm)
Then VHS (air flow through heat exchanger
enclosure can be calculated as :
As explained above, the air flow VHS
through the heat exchanger enclosure must
be used in figure 12 to extract the correct
total pressure drop over the RHC module
with by-pass.
The air flow VHS may not exceed the
maximum airflow allowed according to
section 4.1.2 to avoid supercooling ot the
flue gases.
Model dim. B (mm) factor R1 factor R2
4050 06 461.00 149.80 -247.70
4060 07 530.50 136.80 -268.40
4075 09 670.50 109.80 -265.10
4100 12 880.00 78.80 -253.60
4110M,13 1062 43,5 -164,1
4125M,15 1202 38,5 -167,3
4150M,18 1412 46,3 -224,1
4175M,21 1621 40,0 -231,0
4200M,24 1830 36,8 -235,3
Model dim. D (mm) factor R1 factor R2
4050 06 975 70.90 -117.10
4060 07 975 74.50 -146.20
4075 09 975 75.60 -182.20
4100 12 975 71.30 -228.90
4110M,13 975 47,6 -182,1
4125M,15 975 47,6 -209,5
4150M,18 975 65,8 -318,4
4175M,21 975 64,5 -366,9
4200M,24 975 69,4 -452,8

0603RHC4-JLGBEN 20/21
13.0 INSTALLATION OF AIR FAN IN RESPECT OF RHC
HEATING COIL
To ensure a fluent air distribution over the RHC heating coil, it is stronly recommen-ded to follow the
installation method as described in figure 15.
Figure 15 : Installation of air fan
With :
A : min. distance fan →heating coil
D : width of duct section (see table 1, fig. 4, dim Y2)
d : width of centrifugal fan
2
dD
A− ≥
Example :
RHC 4100 12
D = 1770 mm
d = 500mm
635mm
2
5001770
A=
−
≥