Nortek Reznor RHC DJL 8000 Guide

INSTALLATION/ COMMISSIONING/SERVICING
®
Please read this document carefully before commencing installation, commissioning and/or servicing.
Leave it with the end user/site agent to be placed in their premises technical file after installation.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death.
All work must be carried out by appropriately qualified persons.
The manufacturer does not take any responsibility in the event of non-observance of the regulations concerning the connection of the apparatus causing a dan-
gerous operation possibly resulting in damage to the apparatus and/or environment in which the unit is installed.
RHC DJL 8000
Manual Part No. D301207 Issue C
EU)2016/426(GAR),2009/125/EC(ErP), 2014/35/EU(LVD),and2014/30/EU(EMC)
Regulations and Directives.
The following harmonised standards have been applied:
EN 1020, EN 60335-1, EN 60335-2-102, EN 55014-1, and EN 55014-2
GAS-FIRED POWER VENTED UNIT HEATER

RHC 8000 EN April 2019 D301207 Issue C Page 1
Contents
IMPORTANT NOTICE TO INSTALLERS .............................................................................................. 3
1. Introduction.............................................................................................................................................. 4
2. Technical Data .......................................................................................................................................... 6
3 General Requirements.............................................................................................................................. 10
4. Installation................................................................................................................................................. 16
5. Commissioning & Testing....................................................................................................................... 18
6. Servicing Instructions.............................................................................................................................. 24
7. Removal & Replacement of Parts........................................................................................................... 25
8. Fault Finding............................................................................................................................................. 31
9. Parts Listing .............................................................................................................................................. 34
10. User Operating Instructions................................................................................................................. 35
11. Health & Safety Statement .................................................................................................................... 36
12. ErP Data ................................................................................................................................................. 38

EC Declaration of Incorporation
(Directive2006/42/EC(annexll,SubB)
PROHIBITION TO PUT INTO SERVICE
Nortek Global HVAC(UK)Ltd.,
Fens Pool Avenue,
Brierley Hill,
West Midlands,
DY5 1QA,
United Kingdom
Herewith declares that:
Power-vented gas-fired air heaters, type:
- RHC 8000 DJL series
Are destined to be incorporated in other machines(air-handlers)or to be combined with other
machines(air-handling systems), and are for this reason not entirely in compliance with the
machinery directive 2006/42/EC. Proper integration into the air-handling system sis required to
comply with the prescribed machinery directive.
Is in conformity with the provisions of the (EU)2016/426(GAR),2009/125/EC(ErP), 2014/35/
EU(LVD),and2014/30/EU(EMC)Regulations and Directives.
The following harmonised standards have been applied: EN 1020, EN 60335-1, EN 60335-2-
102, EN 55014-1, and EN 55014-2

RHC 8000 EN April 2019 D301207 Issue C Page 3
IMPORTANT NOTICE TO
INSTALLERS
Installers should satisfy themselves that
the gas pipework installation is carried out
in accordance with all current legislation,
Codes of Practice and recommendations.
Additionally it may be necessary to protect
the gas valves which form part of the
heater or burner assembly from potential
pipe contamination particularly, but not
exclusively, where copper gas pipework is
used.
In instances where copper pipe work is to
be used for all or part of a gas pipework
installation, including short length final
connections then we advise that installers
consult with gas supplier or provider
and satisfy themselves what additional
precautions may be necessary.
Improper installation, adjustment,
alteration,service,or maintenance can cause
property damage,injury,or death. Read the
installation,operation,and maintenance
instructions thoroughly before installing or
servicing this equipment.
Do not use this appliance if any part has
been immersed in water. Immediately call
a qualified service technician to inspect the
appliance and replace any gas control that
has been immersed in water.
Gas-fired appliances are not designed for
use in hazardous atmospheres containing
flammable vapours or combustible dust,
in atmospheres containing chlorinated or
halogenated hydrocarbons or in applications
with airborne silicone substances.
Should overheating occur, or the gas supply
fail to shut off,shut off the manual gas valve
to the appliance before shutting off the
electrical supply.
This appliance is not intended for use by
persons(including children)with reduced
sensory or mental capabilities or lack of
experience and knowledge, unless they
have been given supervision or instruction
concerning use of the appliance by
a person responsible fort heir safety.
Children should be supervised to ensure
that they do not play with the appliance,
Standards,Directives,Codes of Practice or
other recommendations governing the
application and installation of heating
appliances and which may be referred to in
Brochures,Specifications, Quotations,and
Installation,Operation and Maintenance
manuals is done so for information and
guidance purposes only and should only
be considered valid at the time of the
publication.
The manufacturer cannot be held
responsible from any matters arising from
the revision to or introduction of new
Laws,Standards,Directives,Codes of Practice
or other recommendations.
Failure to comply with the
information given with these
symbols will result in severe
personal injury or death
and/or property damage.
Note: Warning: For your safety, if you
smell gas:
• Do not try to light any appliance
• Do not touch any electrical switch,do
not use any phone in your building
• Evacuate all personnel & contact your
gas supplier immediately
• Do not store or use petrol or other
flammable vapours and liquids in the
vicinity of the appliance.
• Improper installation, adjustment,
alteration, service or maintenance can
cause property damage,injury or death.
• Read the installation, operation and
maintenance instructions thoroughly
before installing or servicing this
equipment.
WARNING CAUTION

Page 4 RHC 8000 EN April 2019 D301207 Issue C
• In case of persisting problems,contact
your distributor
• The electrical isolator should only be
used in an emergency and should not be
used for closing down the main burner,
as it switches off the fan prematurely
and may damage the heat exchanger,
invalidating the warranty.
• The temperature in the control section
of the unit may never be less than-10°C
otherwise damage could occur to the
sealing elements of the gas valve and to
the electronic components.
Contained within the text of the manual,
the words ‘Caution’ and ‘Warning’ are
used to highlight certain points.
Caution is used when failure
to follow or implement the
instruction(s) can lead to
premature failure or damage to
the heater or its component parts
Warning is used when failure to
heed or implement the
instruction(s) can lead to not only
component damage, but also to a
hazardous situation being created
where there is a risk of personal
injury.
1. Introduction
Isolate any electrical supply to the heater
and controller before proceeding.
1.1 Basic Information
The instructions in this manual apply to the
RHC8000(M) DJL gas-fired/ fan-assisted
warm air heaters: installed at an operational
ambient temperature between -15°C and
+45°C.
The appliances must be installed in
accordance with the rules in force. Before
installation, check that the local distribution
conditions,nature of gas and pressure and
adjustment of the appliance are compatible.
A permanent electricity supply of 230
volts,50Hz,single phase is required.
• Gas categoriesI2H,I2E,I2E(S),I2E(R), I2Esi,
and I2EK
• RHC 8000(M) DJL model suitable for
indoor air handlers only(when installed
where the height above floor level is
greater than 1,8 meters measured to the
underside of the appliance they may be
used as a garage air heater).
Model RHC 8000(M) DJL heaters are
approved for:
Type B 22/B52 – vertical vent (through the
roof) or horizontal vent (through the wall)
All models & sizes are available for use with
natural, gas with operating temperatures
between 15°C and 40°C.
These instructions are only valid for
appliances designed to operate in Europe.
If the country code and gas category on
the appliance data label does not match
the country of installation or the country
codes and gas category’s as shown in this
instruction manual, it will be necessary to
contact the distributor or manufacturer
to provide the necessary information
for the modification of the appliance to
the conditions of use for the country of
installation.
Check that the local distribution conditions
of electricity supply, type of gas and
pressure of the appliance are compatible.
The total installation should be installed in
accordance with the rules in force, relevant
National Standards, local regulations,and
Codes of Practice.
When the external control calls for heat,
an electronic control begins the ignition
sequence to provide for a safe start.
Under normal conditions the fan motor runs
constantly and after a call for
heat it switches the heater on through a
CAUTION
WARNING

RHC 8000 EN April 2019 D301207 Issue C Page 5
room or duct stat. However,in some
applications, about 30 seconds after the call
for heat, the fan control relay will activate
the fan motor of the air handler.
The electronic control will supervise the
flame during the entire heating cycle to
ensure safe operation. When the required
room temperature is reached, the main
burner will shut down leaving the fan
running to cool down the heat exchanger
After approximately 45 seconds, the fan
delay relay will turn off the fan (if wired).
All models may only be used when installed
within a closed compartment, e.g. an air
handler.
Dimensions: refer to the gures 1,2 & 3.
All dimensions are in mm (25.4mm=
1inch)
1.2. Warranty
Warranty is void if:
• Model RHC 8000(M) DJL/RJL heaters
are installed in atmospheres containing
flammable vapours or atmospheres
containing chlorinated or halogenated
hydrocarbons or atmospheres containing
any silicone, aluminum oxide,etc.,that
adheres to spark ignition flame sensing
probes.
• The installation is not in accordance with
these instructions.
• The maximum air flow through the heat
exchanger tubes is not respected (see
section 3.5).
• The required minimum air delivery is not
respected (see table 7).
• The duct dimensions do not comply with
the prescribed dimensions(see table 8)
• The inlet temperature (measured at the
heat exchanger inlet) is lower than the
value stated on the chart (see fig.5:dew
point occurrence chart).

Page 6 RHC 8000 EN April 2019 D301207 Issue C
2. Technical Data
2.1. Specifications
Models 8045 09 8060 12 8075 09 8075 15 8100 12 8125M 15 8150M 18 8175M 21 8200M 24
Heat input Gross
G20 kW High 56.0 74.6 91.5 91.6 120.0 153.5 182.9 211.8 244.2
kW Low 28.0 37.3 45.8 45.7 60.0 76.7 91.5 105.9 122.1
G25 /
G25.3
kW High 56.0 74.6 91.5 91.6 120.0 153.5 182.9 211.8 244.2
kW Low 28.0 37.3 45.8 45.7 60.0 76.7 91.5 105.9 122.1
Heat Output (1)
G20 High Fire 45.9 61.4 75.7 75.0 99.9 126.4 150.5 174.2 200.4
Low Fire 21.4 28.6 35.4 35.3 46.6 60.3 72.3 82.0 97.1
G25 /
G25.3
High Fire 45.9 61.4 75.7 75.0 99.9 126.4 150.5 174.2 200.4
Low Fire 21.4 28.6 35.4 35.3 46.6 60.3 72.3 82.0 97.1
Gas Rate High
Fire
G20 m³/h 5.3 7.1 8.7 8.7 11.5 146 17.5 20.2 23.3
G25 /
G25.3 m³/h 6.2 8.3 10.2 10.2 13.3 17.1 20.3 23.5 27.1
Power Consumption kW 0.153 0.153 0.153 0.153 0.153 0.282 0.282 0.282 0.655
Injector Details
G20 / G25 /
G25.3
mm 2.40 2.40 3.00 2.40 3.00 3.00 3.00 3.00 3.00
Marking 240 240 300 240 300 300 300 300 300
Quantity 9 12 9 15 12 15 18 21 24
Burner Pressure
(2)
G20 20 mbar 6.9/1.9 6.9/1.9 6.9/2.0 6.9/1.8 6.9/2.1 7.1/1.9 7.3/2.0 7.7/2.1 7.7/2.2
G25 25 mbar 10.3/2.6 10.2/2.8 10.2/2.7 10.2/2.5 10.2/3.1 N/A N/A N/A 12.2/3.3
G25.3 25 mbar 10.3/2.6 10.2/2.8 10.2/2.7 10.2/2.5 10.2/3.0 N/A N/A N/A 12.0/3.1
Minimum Air
Volume with
Heat Output H1
(3)
V1 (4)
m³/h 5650 7500 9300 9300 12400 15600 18200 20100 23300
m³/s 1.57 2.08 2.58 2.58 3.44 4.33 5.06 5.58 6.48
kW
Minimum Air
Volume with
Heat Output H2
(5)
V2 (6)
m³/h 6600 8750 10790 11900 14300 18000 21000 21500 240000
m³/s 1.83 2.43 3.00 3.31 3.97 5.00 5.83 5.97 6.67
kW
1. Heat output depends on airflow - heat output H2 only for airflows above V2
4. V1 = minimum airflow required through enclosure
2. With open Service door 5. H2 = heat output at airflow V2 3. H1 = heat output at airflow V1 6. V2 = minimum airflow for high heat output H2
Table 1. Technical data

RHC 8000 EN April 2019 D301207 Issue C Page 7
Country Code Approved Gas Category
AT, BG, CH, CY, CZ, DK, EE, ES, FI, GB, GR, HR, IE, IT, IS, LT, LV, NO, PT,
RO, SE, SI, SK, TR
I2H
DE, LU, PL, RO I2E
FR I2Esi
BE I2E(S)B / I2E(R)B
NL I2EK
Gas Category Gas Type Nominal Supply
Pressure (mbar) Max Supply (mbar) Minimum Supply (mbar)
I2H / I2E Nat Gas (G20) 20 25 17.5
I2E (S) B / I2E(R)B
/ I2Esi
Nat Gas (G20 /
G25) 20 / 25 25 / 30 17.5 / 18
I2Ek Nat Gas (G20/
G25.3) 20/25 25/30 17.5 / 20
2.2. Definitions
Jacket-less:
A gas-fired air heater supplied as a skeleton appliance e.g. without case or cover.
Module:
The jacket-less gas fired air heater.
Constructor
The undertaking, which builds a module into another casing. e.g. an air handler.
Appliance
An appliance where the air for combustion is taken from within the area where the gas
burner is operated.
Compartment
The section of an appliance into which the module is installed.
B22 / B52 Appliance
An appliance where the air for combustion is taken from within the area where the gas
burner is operated.
Dew point
The condition, when the temperature is such that the water vapour in the combustion
products condenses out.
Table 1.3 - Gas Supply Pressures
Table 1.2 - Country Gas Category
Models 8045 09 8060 12 8075 09 8075 15 8100 12 8125M 15 8150M 18 8175M 21 8200M 24
Heat input Gross
G20 kW High 56.0 74.6 91.5 91.6 120.0 153.5 182.9 211.8 244.2
kW Low 28.0 37.3 45.8 45.7 60.0 76.7 91.5 105.9 122.1
G25 /
G25.3
kW High 56.0 74.6 91.5 91.6 120.0 153.5 182.9 211.8 244.2
kW Low 28.0 37.3 45.8 45.7 60.0 76.7 91.5 105.9 122.1
Heat Output (1)
G20 High Fire 45.9 61.4 75.7 75.0 99.9 126.4 150.5 174.2 200.4
Low Fire 21.4 28.6 35.4 35.3 46.6 60.3 72.3 82.0 97.1
G25 /
G25.3
High Fire 45.9 61.4 75.7 75.0 99.9 126.4 150.5 174.2 200.4
Low Fire 21.4 28.6 35.4 35.3 46.6 60.3 72.3 82.0 97.1
Gas Rate High
Fire
G20 m³/h 5.3 7.1 8.7 8.7 11.5 146 17.5 20.2 23.3
G25 /
G25.3 m³/h 6.2 8.3 10.2 10.2 13.3 17.1 20.3 23.5 27.1
Power Consumption kW 0.153 0.153 0.153 0.153 0.153 0.282 0.282 0.282 0.655
Injector Details
G20 / G25 /
G25.3
mm 2.40 2.40 3.00 2.40 3.00 3.00 3.00 3.00 3.00
Marking 240 240 300 240 300 300 300 300 300
Quantity 9 12 9 15 12 15 18 21 24
Burner Pressure
(2)
G20 20 mbar 6.9/1.9 6.9/1.9 6.9/2.0 6.9/1.8 6.9/2.1 7.1/1.9 7.3/2.0 7.7/2.1 7.7/2.2
G25 25 mbar 10.3/2.6 10.2/2.8 10.2/2.7 10.2/2.5 10.2/3.1 N/A N/A N/A 12.2/3.3
G25.3 25 mbar 10.3/2.6 10.2/2.8 10.2/2.7 10.2/2.5 10.2/3.0 N/A N/A N/A 12.0/3.1
Minimum Air
Volume with
Heat Output H1
(3)
V1 (4)
m³/h 5650 7500 9300 9300 12400 15600 18200 20100 23300
m³/s 1.57 2.08 2.58 2.58 3.44 4.33 5.06 5.58 6.48
kW
Minimum Air
Volume with
Heat Output H2
(5)
V2 (6)
m³/h 6600 8750 10790 11900 14300 18000 21000 21500 240000
m³/s 1.83 2.43 3.00 3.31 3.97 5.00 5.83 5.97 6.67
kW
1. Heat output depends on airflow - heat output H2 only for airflows above V2
4. V1 = minimum airflow required through enclosure
2. With open Service door 5. H2 = heat output at airflow V2 3. H1 = heat output at airflow V1 6. V2 = minimum airflow for high heat output H2

Page 8 RHC 8000 EN April 2019 D301207 Issue C
Figure 1.1 RHC 8125M,8150M,8175M DJL
2.3. Mounting Flange & Main Dimensions
Figure 1 Dimensions RHC 8000(M) DJL (control side)
1. Gas connection
2. Flue outlet
3. Electrical connection
8045 09 8060 12 8075 09 8075 15 8100 12 8125M
15
8150M
18
8175M
21
8200M
24
A 741 950 741 1160 950 1272 1481 1691 1900
A1 85 85 85 85 85 183 183 183 133
A2 656 865 656 1075 865 1089 1298 1508 1767
Table 2 - Dimensions
Figure 1.2 RHC 8200M DJL (not M series)
Figure 1.3 RHC 8000 DJL (not M series)

RHC 8000 EN April 2019 D301207 Issue C Page 9
Figure 2 Top view
Figure 3 - Front view RHC 8000 DJL (not 8125M, 8150M, 8175M, 8200M)
Figure 2.1 RHC 8000 DJL (not 8125M, 8150M,8175M, 8200M)
Figure 2.3 RHC 8200M DJL
Figure 2.2 RHC 8125M, 8150M, 8175M DJL
Figure 1.2 RHC 8200M DJL (not M series)
Figure 3.1 - Front view RHC 8000 DJL (not 8125M, 8150M, 8175M, 8200M)

Page 10 RHC 8000 EN April 2019 D301207 Issue C
Type B C Y
8045 09 50 160 1244
8060 12 125 175 1244
8075 09 50 160 1844
8075 15 80 250 1244
8100 12 125 175 1844
Type Y A3 A4
8125M 15 1844 741 531
8150M 18 1844 741 741
8175M 21 1844 741 950
8200M 24 1844 950 950
Type 8045
09
8060
12
8075
09
8075
15
8100
12
8125M
15
8150M
18
8175M
21
8200M
24
Unit kg 87 120 110 140 145 200 230 265 305
Packaging kg 16 16 20 16 20 35 35 35 35
Total kg 103 136 130 156 165 235 265 300 340
3 General Requirements
3.1 General
It is important that all gas appliances are installed in accordance with the rules in force
and by appropriately qualified persons. Failure to install appliances correctly could lead to
prosecution. It is in your own interest and that of safety to ensure compliance with the law.
CAUTION: Air heaters should not be installed in corrosive atmospheres, i.e. near
plating spray or de-greasing plants or in areas where there is a fire risk.
Figure 3.3 Backside view RHC 8200M
Figure 3.2 - Backside view RHC 8125M, 8150M, 8175M DJL/RJL
Table 4 Dimensions
Table 5 weights
Table 3 - Dimensions
CAUTION

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 m3/h m3/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

Page 12 RHC 8000 EN April 2019 D301207 Issue C
• the temperature rise of the air through the enclosure (around the tubes)
• 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 below).
Type H H1 Y Y2 W W1 E
8045 09 741 671 1244 1170 400 400 400
8060 12 950 880 1244 1170 400 400 400
8075 09 741 671 1844 1770 400 400 400
8075 15 1160 1070 1244 1170 400 400 400
8100 12 950 880 1844 1170 400 400 400
8125M 15 1272 1202 1844 1770 400 460 420
8150M 18 1481 1411 1844 1770 400 460 420
8175M 21 1691 1621 1844 1770 400 460 420
8200M 24 1900 1830 1846 1770 530 530 470
Example :
• expected minimum inlet temperature = -5°C
• minimum required temperature rise shown on the chart = +13°K
Table 1 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 1: Tmin = 13K (with minimum inlet temperature = -5°C)
model 8100 12 at 100% heat output : 99.94kW results into Vmax = 22459m³/h
Example 2: Tmin = 13K (with minimum inlet temperature = -5°C)
model 8100 12 at 50% modulation (see table 1 ‘heat output’) : 47.48kW results into :
Remark For air heaters with modulating gas valve attention must be given to determine
the maximum allowable airflow in function of the appropriate heat input
Table 8 Duct channel & controls compartment

RHC 8000 EN April 2019 D301207 Issue C Page 13
3.6 Combustion Air Supply & Flue
System
The air heater must be installed as a power
vented (Type B) heater, which requires only
a flue pipe exhausting to outdoors and
takes combustion air directly from the space
to be heated.
For models fitted with the optional
vestibule, an air inlet terminal must be fitted
into the air inlet socket (see figure 8).
The centre distance between the
combustion air inlet socket and the flue
outlet socket is 225mm for all other models.
Each appliance requires it’s own individual
flue system. When several appliances are
installed, one common flue and combustion
air system, thus combining several heaters,
is not allowed.
IMPORTANT:
The flue must be installed in
accordance with national and
local regulations. Failure to
provide proper fluing could result
in death, serious injury and/or
property damage.
The air heater must be installed
with a flue to the outside of the
building. Safe operation of any
power vented gas apparatus
requires a properly operating
flue system, correct provision
for combustion air, and regular
maintenance and inspection.
3.6.1 Flues for power vented
installations
(Type B appliances)
For combustion will be taken from within
the space where the heater is installed.
Ensure that an adequate air supply for
combustion and ventilation is provided
within the building in accordance with the
EURO-C 4000 R(JL)
EURO-C 4000 D(JL)
CONDENSATION POINT
-20 ░C
0░C
20 ░C
40K 20K 0K
T
T
INLET AIR TEMPERATURE
30K
CONDENSATION ZONE
AT THE HEAT EXCHANGER
10K
TEMPERATURE RISE OVER THE HEAT EXCHANGER
Figure 5. Dew point occurrence chart (condensation zone)
WARNING

Page 14 RHC 8000 EN April 2019 D301207 Issue C
regulations & rules in force. Table 12 shows
the flue pipe sizes and maximum vent
length The minimum flue length is 0.5M
(500mm)
The combustion air inlet socket at the
appliance must be foreseen with an inlet
grill of class IP20 (for indoor applications,
or an approved vertical flue terminal for
outdoor terminations).
Indoor air inlet socket = PN 60-50712-
130282 Outdoor air inlet cap = PN 33-54-
207
Outdoor air inlet 250mm extension pipe =
PN 33-54-203 Note: extension pipe must be
used with the outdoor inlet cap.
Table 12 shows flue pipe sizes and
maximum vent lengths. The minimum flue
length is 0.5 meters
RHC all models
Heater socket & pipe dia (mm) 130
Centre distance (mm) 225
Maximum straight length (m) 9
Equivalent length of 45° elbow (m) 0.75
Equivalent length of 90° elbow (m) 1.5
To avoid leakage use single wall flue pipes
of seamless aluminium or stainless steel. All
joints must be sealed to prevent products of
combustion from leaking into the building.
An approved flue terminal is required.
If the flue passes through a combustible
element of the building
it must be enclosed by a sleeve of non-
combustible material and separated from
the sleeve by at least a 25 mm air break.
The temperature of any combustible
material near to the flue must not exceed
65 °C when the heater is in operation.
The flue must be at least 50 mm away from
any combustible material.
Attention
Single wall flue pipe exposed to
cold air or run through unheated
areas must be insulated. Where
condensation is unavoidable,
provision must be made for the
condensation to flow freely to a
point to which it can be released,
i.e. a drain or gully.
The condensation drain from the
flue must be constructed from
non- corrodible material not less
than 20 mm diameter. Copper or
copper-based alloys must not be
used for condensation drains.
Attention: Flue pipe requirements
for the RHC 82000M.24 DJL ONLY!
To guarantee that the RHC 8200M.24
DJL is working at 91% efficiency , it is
necessary to fix a restriction plate ar
the compustion air outlet opening.
The diameter of the restriction plate
depends on the length of the flue pipe
as indicated in the table below
Restriction
Flue outlet
pipe
(not
delivered
with unit)
Restriction
Flue outlet
pipe (not
delivered
with unit)
Air outlet Pipe Restriction diameter mm
1-2 99
3-5 107
6-9 open
Table 12 Flue pipe diameters
& maximum lengths
WARNING
Figure 6

RHC 8000 EN April 2019 D301207 Issue C Page 15
3.6.2 Air Supply
It is important to ensure that there is an
adequate fresh air supply at all times for
both combustion and heating requirements.
Modern constructions involve the greater
use of insulation, improved vapor barriers,
and weather proofing.
This practice means that buildings are
sealed much tighter than in the past.
The combustion air supply for a power
vented gas fired air heater (Type B
installation) can be affected by lack of air
supply. Natural infiltration may not be
adequate. Use of extract fans aggravates
this situation. It is important to ensure that
there is an adequate air supply at all times.
Reliance on doors and windows is not
allowed. Always ensure that an adequate
inlet for fresh air for combustion is provided
sized to suit the total installation of any
combustion apparatus.
Fix an access guard (IP 20) into the wall
for combustion air and take appropriate
action to ensure that it remains unblocked.
See national installation requirements for
aeration & ventilation of buildings.
This model air heater is installed
as a type B application and
is designed to take air for
combustion from the space in
which it is installed. Do not restrict
the combustion air intake.
3.7 Electrical Supply
Wiring external to the air heater must be
carried out in accordance with the rules
in force and by appropriately qualified
persons.
Check the electrical specification is in
accordance with the specification on the
appliance data plate. A unique appliance
wiring diagram is supplied as a separate
document attached to this one plus an
additional copy attached to the air heater.
A constant 230 volt 50 Hertz single phase
with neutral link fused electricity supply is
required. All heaters and controls must be
earthen. A lockable isolator with contact
separation of at least 3.0 mm on all
poles should be installed adjacent to the
appliance and within reach of any person
working on the heater.
When a number of heaters are to be
connected as part of a single installation
each heater must be provided with a
separate isolator.
Ensure that electrical supply cables do not
touch the very hot combustion collector
box. The final connection must be made
in the terminals provided in the control
compartment. Follow the wiring diagram
provided with the air heater and the air
handler.
Electrical supply cable conductor size should
be 1.5 mm. The length of conductors
between the cord grip and the terminals
must be such that in the event that the
cable becomes taut the line conductors do
so before the earth conductor.
3.8 Gas Supply
Attention : gas service connection Rc 3/4
for models RHC 8000 & Rc 11/4 for models
RHC 8000M
RHC 8000(M) air heaters are designed to
operate on either natural gas (G20/G25 /
G25.3). Refer to the specifications in section
2 of this document and to the data plate for
details of supply pressures.
The gas meter and gas service must be
checked by the supply undertaking to
ensure that they are adequate to deal with
the total load of all gas fired apparatus
installed.
Connection to a gas service may only
be carried out by appropriately qualified
persons. The gas installation must comply
with the rules in force using materials
appropriate for gas installations.
WARNING

Page 16 RHC 8000 EN April 2019 D301207 Issue C
To facilitate servicing, the air heater must be
fitted with an approved gas service tap and
union fitting or union tap adjacent to the
appliance.
The inlet gas supply line must be installed so
as to permit the access door to be opened
and to allow removal of slide out burner
assembly.
Check that the gas category is in
accordance with the data described on the
air heater.
An adequate gas supply sized to provide the
dynamic pressure for the volume required
for the air heater(s) is essential to maintain
the nominal heat input.
Account of other gas fired plant using the
same gas service must also be taken into
account.
A 90° action, positive stopped gas
service tap must be fitted adjacent to the
appliance, fitted in a manner to facilitate
appliance burner removal for service
purposes, see figure 7.
Ensure that the gas service includes a
filter and has been tested and purged in
accordance with prescribed practice prior
to commissioning and taking the appliance
into service.
As a rule, gas service pipes should not be
routed through air ducts. Should it be
necessary to do so then pipe work joints
must not be made within the air duct
4. Installation
4.1 Unpacking and Preparation
Prior to dispatch, the air heater was
operated and tested at the factory.
Check the shipping label and data plate to
ensure the specification of gas and electrical
supplies are compatible.
Read this document and become familiar
with the installation requirements and the
appliance before commencing installation.
4.2 Fitting the Flue System
Flue pipe runs may be horizontal or vertical
and terminate either through the wall or
roof. See table 12 for maximum vent length
for an appliance installed as type B
4.2.1 Fitting the Flue Pipe
Flue pipes must be sealed. Use seamless,
aluminum or stainless steel pipe. Follow
pipe manufacturer’s instructions
4.2.2 Installing a Grille
On the combustion air inlet pipe for power
vent (Type B installations)
When installed as a type B appliance,
protect the inlet by fitting an access grille
on the socket.
Figure 7 gas connection detail Rc 3/4
(8000 models) or Rc 11/4 (8000M models)

RHC 8000 EN April 2019 D301207 Issue C Page 17
Do not block this socket as it
supplies combustion air for the
burner
The inlet must be provided with a
protection grill (see figure 8)
Type Flue Pipe
Socket SIZE
(diameter
mm)
Air Inlet
Socket SIZE
(diameter
mm)
All Models 130 130
Indoor air inlet socket = PN 60-50712-
130282 Outdoor air inlet cap = PN 33-54-
207
Outdoor air inlet 250mm extension pipe =
PN 33-54-203 Note: extension pipe must be
used with the outdoor inlet cap.
4.2.3 Electrical Connections
The electrical installation may only be
carried out by appropriately qualified
persons observing the rules in force. All
electrical connections should be made in
the heater control compartment. Screw
type terminals are provided. Connections
should be in accordance with the terminal
markings and the wiring diagram affixed
to the air heater or included with this
document.
WARNING
WARNING: THIS APPLIANCE MUST
BE EARTHED.
The minimum external controls required for
the air heater are a room thermostat. It is
essential the main input line and neutral to
terminals L and N remains live at all times
even when the appliance is switched off this
is to ensure correct operation of the unit.
An indicator light and burner-reset button
are fitted inside the appliance. To add a
remote reset button, make connections to
the terminals in the electric box as indicated
on the wiring diagram.
IMPORTANT: If the reset button requires
activating for any reason the cause should
be identified before resetting. After
resetting stay with the appliance for long
enough to ensure that lockout does not
reoccur (suggest 5 minutes).
4.2.4 Room Thermostat Siting
Do not attempt to control more than 1 air
heater from a room thermostat or control
panel unless a properly wired relay is fitted.
Follow instructions supplied with such
panels.
The siting of the room thermostat is
important. It should not be fitted on an
outside wall. Avoid location in draughty
areas or where it may be influenced by heat
sources e.g. the sun, process plant, etc.
The thermostat or temperature sensor
should be mounted on a vibration
free surface and mounted about 1.5m
above floor level. Follow the thermostat
manufacturers fitting instructions. The
thermostat must be suitable for switching
230 volts.
Table 13 Flue pipe socket size
Figure 8
WARNING

Page 18 RHC 8000 EN April 2019 D301207 Issue C
4.2.5 Electrical Isolator
Ensure that an electrical Isolator with two
pole separation with a minimum air break
between poles of 3,0 mm has been fitted
adjacent to the air heater.
5. Commissioning &
Testing
Appropriately qualified persons may only
carry out the commissioning and testing.
This section should be read and fully
understood before commencing
commissioning and testing.
5.1 Electrical Check
After completion of the installation and
before switching on the electrical supply to
the appliance, a qualified electrician must
carry out a preliminary check. The following
must be checked:
• Check that electrical cables/wiring do
not touch the ‘hot’ combustion collector
box and fix them on the gas pipe;
• Check that all wiring is connected in
accordance with the appliance circuit
diagram;
• Ascertain that the correct fuse value and
cable size has been provided;
• Check to ensure that the appliance
is earthed by conducting an earth
continuity test. Connect a test meter,
one lead to the appliance earth terminal
and the other to the mains incoming
earth point at the electrical isolator. A
resistance reading of 1,0 ohm or less
must be indicated. If a higher reading
is obtained, check all cable connections
to ensure adequate security and
cleanliness. If problem still exists, it may
be necessary to consult the electricity
supply undertaking;
• Carry out a polarity test. Connect one
lead of a suitable AC voltmeter to earth
and connect the other lead to the live
supply terminal (L) at the air heater.
Switch ON the power to the air heater
and check for correct voltage. The same
result should be obtained by connecting
the test leads between live and neutral.
Connect the voltmeter test leads to
N and E. A reading of + 0V should be
obtained. If these tests do not conform
with the above, there is a fault which
must be rectified before proceeding
further with the commissioning;
• Check that a suitable thermostat or
control panel has been fitted;
• Ensure that an electrical isolator with
two pole separation with a minimum
air break between poles of 3,0 mm has
been fitted adjacent to the air heater.
5.2 Gas Connection
(Gas Service Connection of 3/4”or 11/4”for
8000 or 8000M units)
Only persons formally qualified to work
on gas fired apparatus may carry out
commissioning and testing. The whole
of the gas service installation including
the meter must be inspected, tested for
soundness and purged in accordance with
appropriate requirements by a qualified
person
CAUTION: Never use a flame for
checking gas soundness.
5.3 Lighting The Air Heater
RHC 8000(M) air heaters are all fitted with
automatic spark ignition systems. When
adequate airflow for combustion is
proven by an air proving control and a
pre-purge period has elapsed, the integral
igniter and multi-functional gas control
operate. The ignition spark ignites the
gas creating the burner flame, which is
detected by a flame rod sensor. If a burner
flame is not detected, the ignition controller
proceeds to lockout and requires manually
resetting. Lockout is indicated by the red
warning light on the wiring panel inside the
heater.
CAUTION