Reznor Comet+ User manual

FLOOR STANDING WARM AIR HEATER
INSTALLATION / COMMISSIONING / SERVICE /
USER MANUAL
Comet+ (Gas & Oil)
Manual Part No. D301518 Issue 0
®
Supply of Machinery (Safety) Regulations 2008
Supply of Machinery (Safety) Regulations (A) 2011
Electrical Equipment (Safety) Regulations 2016
Electromagnetic Compatibility Regulations 2016
Gas Appliances (Product Safety and Metrology etc (Amendment etc)
(EU Exit) Regulations 2019)
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 dangerous operation possibly resulting in damage to the apparatus and/or environment
in which the unit is installed.
ErP
2021
ErP Lot 21
Seasonal Efficiency and
NOx compliant

PAGE 2 Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0

Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0 PAGE 3
CONTENTS
Contents
Product Introduction
Comet+ Range ................................................4
Health and Safety
General Health and Safety ................................5
Before Using this Appliance ..............................6
Location/Positioning..........................................6
General Requirements.......................................7
Electrical Supply................................................8
General
General.............................................................9
Disposal Instructions .........................................10
Installers Responsibilities ...................................11
Compliance Notices ..........................................11
Warranty ..........................................................12
Technical Data (TD)
Technical data...................................................14
Dimensions.......................................................16
Installation
Pre Installation ..................................................18
Handling...........................................................18
Installation Considerations ................................19
Clearances and Access......................................20
Combustion Air/Ventilation Requirements.........20
Flue System.......................................................20
Gas Installation and Connection........................25
Oil Installation/Connection................................25
Ducted Models .................................................28
Nozzled Models ................................................29
Condensate Drains............................................29
Electrical Installation/Connection.......................29
Controls............................................................31
Commissioning
Commissioning.................................................32
Unit Operation..................................................34
Overheat Protection ..........................................34
Maintenance
To Clean the Heat Exchanger ............................36
Burner Removal ................................................36
Burner Maintenance .........................................36
Heat Exchanger Maintenance............................37
Routine Maintenance........................................37
Fan Assembly....................................................37
Gas/Oil Control Valve Maintenance ...................37
Cleaning of Heater............................................37
Removal and Replacement of
Parts
Multi-Block Gas Valve .......................................38
Fan and Limit Stat.............................................38
Burner Replacement .........................................38
Recommended Tools.........................................38
Spare Parts
Spare Parts........................................................39
Trouble Shooting
Fault finding .....................................................40
User Instructions
User Instructions ...............................................41

PAGE 4 Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0
COMET+ is the latest generation of floor standing cabinet heaters, combining innovative
design with proven heat exchanger technology to provide a highly efficient, cost effective and
durable range. The heaters are CE and UKCA certified and compliant with BS EN 17082 for
use in non domestic installations.
The COMET+ range encompasses heating duties from 45kW to 300kW in a number of
variants:-
• Natural gas (G20) fired;
• Natural gas (G20) fired high efficiency condensing;
• Propane gas (G31) fired;
• Oil (Class D 35 second gas oil) fired complete with a fire valve and oil filter supplied as loose
components;
• Kerosene (Class C2 28 second heating oil) fired complete with a fire valve and oil filter
supplied as loose components;
• Free blowing with rotating long throw discharge nozzles complete with horizontal louvres
(supplied loose);
• Ducted discharge with top outlet suitable for duct connection.
The following options are available upon request:-
• Front flue connection (rear connection as standard)
• External weatherproof casing
• Right hand side grille (left hand side as standard)
• Flat pack format to aid with installation in areas with restricted access.
All models have been designed for internal use only unless specifically designated for external
use (optional external weatherproof casing).
The type of fuel, the input rate and the electrical supply requirement is shown on the heater
rating plate. Check the rating plate to determine if the heater is appropriate for the intended
installation. It is especially important to check that the fuel type shown on the data
plate corresponds with the fuel intended to be used/available on site. All available
variants are listed in the technical data section following on pages 14 and 15.
This installation manual is shipped with the unit. Verify that the literature is correct for the
model being installed. If the manual is incorrect for the heater, contact the supplier before
beginning installation. The instructions in this manual apply only to the models listed.
This installation manual must be read in conjunction with the burner installation manual
shipped with the unit. Verify that the manual is correct for the burner installed in the heater. If
the manual is incorrect for the burner, contact the supplier before beginning installation.
All heaters are factory tested prior to despatch. Each heater is individual. The relevant data
can be found on the data plate attached to the heater.
Installation should be carried out by a suitably qualified installer in accordance with these
instructions and the current rules and regulations in force. The installer is responsible for the
safe installation of the heater.
PRODUCT INTRODUCTION

Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0 PAGE 5
General Health and Safety
WARNING
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.
CAUTION
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
GAS LEAK EMERGENCY
If you can smell gas from or near the
heater:
• Do not try to light any appliance
• Do not smoke or light matches
• Do not turn electrical switches on or
off
• Open doors and windows, to air the
room
• Close the fuel control to the device
• If you still smell gas turn off the
supply at the meter unless the meter
is in the cellar
• Raise the alarm and evacuate all
personnel to a safe place
• Promptly Call your Gas Emergency
number
Enter your gas emergency number below
• Do not store or use petrol or other
flammable vapours and liquids in the
vicinity of the appliance.
• In case of persistent problems, contact
your distributor.
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, isolate 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 for their safety.
Children should be supervised to ensure
that they do not play with the appliance.
Carry out a risk assessment for the task to
be carried out and ensure the correct use of
any Personal Protective Equipment.
This manual should be kept in a safe place
for future reference.
HEALTH AND SAFETY

PAGE 6 Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0
Before using this appliance:
• Carefully read these instructions and
follow the processes explained by the
manufacturer. These instructions are
only valid for appliances designed to
operate in Europe.
• Check that the voltage indicated on
the type plate corresponds to the mains
supply voltage. 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
categories 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
• Ensure that the heater has been securely
fastened in its final mounting position.
• Installing, commissioning, testing,
programming and maintenance of these
products must only be carried out by
suitably qualified and trained technicians
and in full compliance with all applicable
regulations and current best practices.
• Check if the appliance as described on
the packaging label is in accordance
with the correct type and model as
specified on the data plate and complies
with your customer order.
• Check that the temperature ranges
given and those of the location match.
The appliance must be powered with
a voltage corresponding to the value
shown on the rating plate.
• The heater must be installed in
accordance with the rules in force
and local regulations/legislation as
appropriate plus all local building codes.
• Ensure that the burner manual is
available.
• Installers should satisfy themselves that
the gas or oil pipework installation
is carried out in accordance with all
current legislation, Codes of Practice
and recommendations.
Location/Positioning
The oil variants of the heaters
must be installed in accordance
with the current OFTEC regulations
for oil fired products.
Under no circumstances should
any item be placed on or above
any part of the heater, whether it
is being used or not.
All basic criteria must be satisfied
prior to commencing the
installation and commissioning
process.
The heater must be positioned
and installed to comply with all
relevant standards and guidelines.
The heater installation should
meet the local and national fire
regulations and insurance criteria;
this is critical if the heater is to be
installed within a special risk area
(e.g. being within close proximity
to where petrol engined vehicles
are stored or parked, where
cellulose spraying takes place,
where woodworking machinery is
being operated, etc.).
The heater must not be installed
within an area with unsuitable
conditions, e.g. where the
atmosphere is highly corrosive, has
a high degree of salinity, or where
high wind velocities may affect
burner operation.

Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0 PAGE 7
Suitable protection should be
provided for the appliance when it
is to be located in a position where
it may be susceptible to external
mechanical damage; for example,
fork lift trucks, overhead cranes
etc.
Heaters must not be located in hazardous
areas, however, it is permissible for the
heater to supply air to such areas.
The heater must not be installed within
an environment where there is a high
concentration of chlorides, fluorides, salts,
or other aggressive or volatile chemicals/
compounds. Nor should the heater be
positioned where the burner could be
adversely affected by high winds or
draughts.
The location chosen for the heater must
allow for the fitting of an effective flue
system.
The location must also allow for adequate
clearance for the air supply, return air
circulation, gas supply and electrical supply,
whilst also providing good and safe working
access.
The heater must be installed on a flat and
level surface made from non-combustible
material, which is sufficiently robust to
withstand the weight of the heater and any
ancillary equipment.
General requirements
Unauthorised modification of the
appliance, or departure from the
manufacturers guidance on
intended use and recommended
practices may constitute a hazard.
To ignore the warning and caution
notices, and advice from the
manufacturer on installation,
commissioning, servicing, or use,
will jeopardise any applicable
warranty.
Moreover, such a situation could
also compromise the safe and
efficient running of the appliance
itself and thereby constitute a
hazard.
All heaters must be earthed.
The installation of the appliance must meet
all the relevant national, regional and local
criteria.
Prior to installation the following
points should be considered:-
• The position of the heater for the
optimum efficient distribution and
circulation of warm air.
• The position of the heater relative to the
route of the flue.
• The position of the heater relative to the
supply of fuel.
• The position of the heater relative to the
electrical services, and if appropriate,
any additional controls.
• The position of the heater relative to the
supply of fresh combustion air.
• The height if applicable at which the
heater is to be mounted and potential
stratification/circulation problems.
• The position of the heater relative to
service and maintenance requirements.
The heater output should be sized to
suit the area that it is heating; heat loss
calculations must be carried out to ensure
the correct sized heater is installed. The
Reznor technical department can provide
guidance.
The appliance is designed to work in a
maximum ambient temperature of 40°C.
The air heaters are designed for mounting
directly on the floor and do not need any
fixing.

PAGE 8 Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0
Electrical supply
Ensure the supply is in accordance
with the manufacturer’s
recommendations and is as stated
on the appliance data plate.
The main electrical supply
must not be switched off or
disconnected as a method for
stopping the heater; the exception
to this is in an emergency, or
during servicing, where the
heat exchanger has been given
sufficient cooling time to prevent
damage from occurring. Claims for
damage will not be considered if
they result from incorrect wiring
or incorrect use of the heater.
Wiring external to the heater must be
installed in accordance with all local,
regional and national regulations.
The means of connection to the main
electrical supply must allow for complete
electrical isolation of the heater and
furthermore, the supply should only be used
to serve the heater itself and no other plant
or equipment.
The position of the isolation switch must
be such that it is adjacent to the heater and
easily accessible at all times. In addition,
the isolator itself must have a contact
separation of not less than 3mm.
The control fuse ratings are detailed on the
appliance data plate.
Ensure that the electric and gas or
oil supplies are turned off before
any electrical work is carried out
on the heater.
Ensure that wiring cannot make contact
with any surfaces liable to be subject to
high temperatures or where the insulation
of the wiring could be impaired as a result
of such contact.

Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0 PAGE 9
General
This manual and the burner manual are
integral parts of the heater, therefore they
should always be carefully kept and should
always be provided together with the
heater, if it is transferred to another owner
or user. If this manual or the burner manual
is damaged or lost, a new one should be
requested from the installer or from the
manufacturer.
After unpacking the product, please check
the contents to ensure all components are
present. If not, please contact your supplier.
Before installation, carefully read these
instructions and follow the processes
explained by the manufacturer. 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 categories 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.
Installing, commissioning, testing,
programming and maintenance of these
products must only be carried out by
suitably qualified and trained technicians
and in full compliance with all applicable
regulations and current best practices.
The installation must be carried out by
suitably qualified personnel who, at the
end of the work, will commission the
appliance and issue to the owner a copy
of the commissioning report, which also
confirms that the installation has been
carried out in accordance with regulations
& standards applicable to the country of use
and in accordance with the manufacturers
instructions.
This appliance has been manufactured
specifically for room heating and must be
used only for this purpose. Contractual
liability of the manufacturer in respect
of damages caused to people, animal or
premises by incorrect installation, settings,
maintenance or by improper use of the
heater is excluded.
Check if the appliance as described on the
packaging label is in accordance with the
correct type and model as specified on the
data plate and complies with your customer
order.
Check that the temperature ranges given
and those of the location match. The
appliance must be powered with a voltage
corresponding to the value shown on the
rating plate.
The unit must be installed in accordance
with the rules in force and local regulations/
legislation as appropriate plus all local
building codes. Installers should satisfy
themselves that the gas or oil 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.
If the appliance is to remain
unused for long periods, it is
recommended that the following
operations are carried out:
• Turn the appliances’ electrical
supply off via the local isolator.
• Close the main fuel supply
valve.
GENERAL

PAGE 10 Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0
If there is a long period of time between
operation of the heater, it is recommended
that you contact your installer to carry out
the new start-up.
The heater must be fitted with approved
accessories and spares only. The
manufacturer is not liable for damages
arising from the improper use of the heater
or from the use of non-original materials
or accessories. References to Laws,
Regulations, Directives and Technical Rules
mentioned in this manual are provided only
for information purposes and are in force
when the manual is printed.
The introduction of new provisions or
amendments to current laws does not
represent an obligation of the manufacturer
towards third parties.
Repairs or maintenance are to be performed
by suitably trained and qualified personnel
only.
Do not modify or tamper with the appliance
- the manufacturer will not be held
responsible for any third party modifications
made to the heater.
The services that are to be connected (fuel
pipes, power supply, etc.) must be suitably
secured and must not be hazardous or
present the risk of a trip hazard.
The manufacturer is responsible for the
product compliance with Laws, Directives
or Construction Rules in force when the
product is marketed. The knowledge and
observance of the laws and standards
regarding plant design, installation,
operation and maintenance are the sole
responsibility of the designer, installer and
user. The manufacturer shall not be held
responsible for failure to comply with
the instructions of this manual, for the
consequences of any operations carried
out and not specifically provided for or for
translations open to misinterpretation.
The electrical system must feature suitable
individual and independent electrical
protection for each appliance which, in case
of accidental failure, will be activated on the
single appliance without prejudice to the
proper operation of the other units present
on the installation.
Note:
The appliance is designed to be operated
with the heating capacity and the air
flow rate specified in the technical data
section following. If the heating capacity
is too low and/or the air flow rate is too
high, combustion products may condense,
resulting in the irreparable corrosion of the
heat exchanger. If the heating capacity is
too high and/or the air flow rate is too low,
overheating of the heat exchanger may
occur, resulting in the activation of the high
temperature safety devices and could cause
damage to the exchanger.
Disposal instructions
Disposing of the appliance must be
carried out by an authorised company
and in compliance with the applicable
laws. Before taking waste to Authorised
Collection Centres, dismantle and separate
the various materials that comprise it. In
summary these are:
• Ferrous materials
• Aluminium and copper
• Electrical wiring
• Seals and insulating materials
• Plastic materials
• Electronic cards

Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0 PAGE 11
Installers responsibilities
It is the installers responsibility to:-
• Install the heater, as well as the gas
or oil, condensate drainage (where
applicable) and electrical supplies,
in accordance with all applicable
specifications and codes. The
manufacturer recommends the installer
contact a local Building Inspector, Fire
Officer or Insurance Company for
guidance.
• Use the information given in this manual
together with the local and national
codes to perform the installation.
• Install the heater in accordance with the
clearances given on page 20.
• Plan for the installation of suitably
designed supports, flues and air intakes.
• Provide access clearance to the unit and
burners for servicing.
• Provide the owner with a copy of this
installation, commissioning, operation
and service manual.
• Provide a copy of the commissioning
report for the heater.
• Provide a copy of the burner manual.
• Ensure that there is sufficient ventilation
in the area to comply with the
requirements of the heater and all
relevant local and national codes.
Ignoring the warning and caution
notices and the advice from the
manufacturer on installation,
commissioning, servicing or use,
will jeopardise any applicable
warranty. This could also
compromise the safe and efficient
running of the appliance itself and
thereby constitute a hazard.
Compliance notices
The heater range detailed herewith is
manufactured within a strictly controlled
quality environment to the parameters of
ISO 9001.
These instructions are only valid if the
following country code is on the appliance
GB. IE. If this code is not present on the
appliance, it is necessary to refer to the
technical instructions which will provide
the necessary information concerning
the modification of the appliance to the
conditions of use for the country.
The manufacturer has taken reasonable and
practical steps to ensure that all heaters are
safe and without risk when properly used.
These heaters should therefore only be used
in the manner and purpose for which they
were intended, and in accordance with the
recommendations detailed herewith. The
manufacturer supports all new products
being supplied to their customers with
a comprehensive information pack; this
clearly defines mandatory instructions for
the safe installation, use, and maintenance,
of the appliance(s).
Where proprietary items are incorporated
into any of the heaters, detailed information
and instructions are also provided as part of
the information pack. It is the responsibility
of the installer, owner, user, or hirer of
the heater to ensure that they are familiar
with the appropriate information/manuals
supplied by the manufacturer and the safety
instructions. In addition, operators must be
suitably trained in the use of the appliance
so as to ensure its continued safe and
efficient use.
The manufacturer has a commitment to
continuous improvement and therefore
reserves the right to amend or change
the specification of the heater subject to
compliance with the appropriate national,
regional and local regulations.

PAGE 12 Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0
The Comet+ Air Heater range
conforms to the following
standards:
BS EN 292-1
Safety of Machinery - Basic Concepts,
General Principles for Design Basic
Terminology Methodology
BS EN 292-2
Safety of Machinery - Basic Concepts,
General Principles for Design Technical
Principles and Specifications
BS EN 60204-1
Safety of Machinery - Electrical Equipment
for Machines Specification for General
Requirements
BS EN 60335-1
Safety of Household and Similar Electrical
Appliances General Requirements
BS EN 60335-2
Safety of Household and Similar Electrical
Appliances. Particular requirements for gas,
oil and solid-fuel burning appliances having
electrical connections
BS EN 55014
Limits and methods of measurement of
radio disturbance characteristics of electrical
motor-operated and thermal appliances for
household and similar purposes, electrical
tools and similar electric apparatus
BS EN 17082
Non-domestic forced convection gas-fired
air heaters.
The heater range also complies with the
following:-
• Supply of Machinery (Safety) Regulations
2008 and Supply of Machinery (Safety)
Regulations (A) 2011
• Electrical Equipment (Safety) Regulations
2016
• Electromagnetic Compatibility
Regulations 2016
• Gas Appliances (Product Safety and
Metrology etc (Amendment etc) (EU
Exit) Regulations 2019)
Warranty
The heater is supplied with a 1 year parts
and labour warranty and a further year on
all parts excluding consumables.
The warranty commences from the date
of dispatch from the manufacturer, and
is subject to the terms detailed within the
Manufacturers ‘conditions of business’
unless otherwise agreed at the time of
order.
Note: The warranty may be invalidated
if:
• The installation is not in accordance with
these instructions.
• The heater has been installed without
proper clearances wherever clearances
are required.
• The flue arrangement and ventilation/
combustion air supply for the heater
are not in accordance with the
manufacturers recommendations, and
local and national codes of practice and
similar standards.
• Air flow through the heater is not in
accordance with the manufacturers
technical specifications.
• Internal wiring on the heater has been
tampered with or unauthorised service
or repairs undertaken.
• The main electrical supply input to the
heater has been interrupted during the
heating mode.
• The heater has been subject to and
affected by the ingress of water in any
form.
• The heater is not operated at the
rating(s) laid down in the manufacturers
technical specifications.
• The heater has not been operated or
used within the normal scope of its
intended application.

Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0 PAGE 13
• The air delivery system is modified in any
way.
• The manufacturer’s recommended
minimum service and maintenance
requirements have not been complied
with.
Note: All warranty claims must contain
the following information to enable
processing to take place.-
• Heater model
• Heater serial number
• Order reference/date of order, together
with:-
• Full installation details (name and
address)
• Details or symptoms of fault
• Installers name and address
• Commissioning and service records
Faulty parts must be returned to the
supplier, the address of which is provided
at the rear of this manual. Any such parts
will undergo inspection to verify the claim.
Replacement parts supplied prior to this
may be charged, and a credit supplied upon
subsequent validation of the warranty
claim. Consumable items are specifically not
included within the scope of the warranty.
Note: Notification is required
immediately a fault is suspected.
The manufacturer will not accept
responsibility for any additional damage
that has been caused, expense incurred, or
consequential loss resulting from any failure
of the heater(s).
The electrical isolator should only
be used for maintenance purposes
or in an emergency. It 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.

PAGE 14 Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0
TECHNICAL DATA
COMET 045 - D - N - 2 - EX
Version
2 = COMET+ standard efficiency
2C = COMET+ high efficiency condensing
Model
COMET = COMET+ Cabinet Heater
Outlet Type
D = Ducted
N = Nozzled
Model Number
The appliance nominal heat output
045, 060, 090, 150, 180, 210, 300 kW
Fuel Option
N = Natural Gas (G20)
P = Propane (G31)
O = Oil Fired (35 sec oil)
K = Kerosene (heating oil)
Cabinet Type
Nil = Standard Internal
EX = External enclosure
COMET+ heaters are available in natural gas, natural gas condensing,
propane, oil fired and kerosene variants with nozzles or a ducted outlet. The
product codes are as shown below.
Note:
Heaters with a standard internal cabinet are suitable for internal use only.
Heaters with an external enclosure (EX) are suitable for external or internal use.
Kerosene variants are only available up to model 150

Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0 PAGE 15
Technical Data
COMET+ 045 060 090 150 180 210 300
Heating Data
Nominal Heat Output (kW) 45 60 90 150 180 210 300
Heat Input (kW) 48 64 96 160 193 225 321
Temperature Rise (°C) 41 41 41 41 41 41 41
Thermal Efficiencies (Nett CV %) Minimum 93.5%
Nox Seasonal (mg/kW) 45.0 45.0 45.0 45.0 45.0 45.0 45.0
Gas Fired
Gas Consumption Natural Gas (G20) (m³/hr) 4.50 6.00 9.00 14.99 17.99 20.99 29.99
Gas Consumption Propane Gas (G31) (m³/hr) 1.86 2.48 3.72 6.20 7.44 8.67 12.39
Minimum Dynamic Inlet Pressure Nat Gas (G20) (mbar) 17.5 17.5 17.5 17.5 17.5 17.5 17.5
Minimum Dynamic Inlet Pressure Propane (G31) (mbar) 37 37 37 37 37 37 37
Gas Connection (Rc) ¾” ¾” ¾” ¾” 1¼” 1¼” 1½”
Oil Fired
Oil Consumption (Class D 35 sec gas oil) (kg/hr) 4.44 5.91 8.87 14.79 17.74 20.70 29.57
Oil Consumption (Class C2 28 sec kerosene) (kg/hr) 3.74 4.99 7.48 12.47 N/A N/A N/A
Oil Connection (Rc) 3/8”3/8”3/8”3/8”3/8”3/8”3/8””
Air Handling Data
Airflow (m³/hr) 3276 4392 6552 10944 13104 15264 21816
Airflow (m³/sec) 0.91 1.22 1.82 3.04 3.64 4.24 6.06
Number of Nozzles 4 4 4 4 4 4 4
Nozzle Throw (m) 26 26 29 38 44 46 48
External Static Pressure (Ducted) (Pa) 250 250 250 250 250 250 250
Fan (kW) 0.65 0.80 1.20 2.50 3.00 3.50 7.50
Full Load Current (A) 1.2 2.3 3.9 4.5 4.8 5.5 11.5
General Data
Electrical Supply 415 V / 3 Ph / 50 Hz
Nominal Flue Diameter (mm) 130 130 130 130 200 250 250
Noise Level @ 5m dB(A) 58 62 72 75 76 77 79
Net Weight (kg) 338 343 354 458 497 543 598
Natural Gas @ 38.52 MJ/m³ I Propane @ 93.2 MJ/m³ I Oil @ 39.06 MJ/I I Kerosene 43.10 Mj/kg

PAGE 16 Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0
Dimension (mm) Model
45 60 90 150 180 210 300
A - Unit Width 800 800 800 800 950 950 1100
B - Unit Depth 950 950 950 1200 1400 1400 1520
C - Unit Height 2000 2000 2000 2000 2250 2250 2250
D - Flue Diameter 130 130 130 130 200 250 250
E - Intake Duct 650 650 650 650 650 650 650
F - Intake Duct 850 850 850 1100 1300 1300 1420
G - Flue Centre 375 375 375 375 475 475 575
H - Flue Height 1777 1777 1777 1777 1970 1970 1970
K - Burner Centre 375 375 375 375 475 475 575
L - Burner Height 1176 1176 1176 1176 1250 1250 1250
M - Burner Protrusion 230 230 230 230 560 560 560
N - Ext Nozzle Height 798 798 798 798 949 949 949
P - Nozzle Height 409 409 409 409 547 547 547
Q - Duct Outlet 850 850 850 1100 1300 1300 1420
R - Duct Outlet 700 700 700 700 850 850 1000
S - Condensate Size (if fitted) ¾” ¾” ¾” ¾” 1” 1” 1”
DIMENSIONS
Note:
Condensate connections are provided at high efficiency condensing versions of the heater only

Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0 PAGE 17
Models with nozzled outlet
Models with ducted outlet

PAGE 18 Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0
Pre installation
Uncrating and Preparation
Prior to crating and shipping, this unit was
test operated and inspected at the factory
and left in full operating condition. If the
unit has incurred damage in shipment,
document the damage with the transport
company and contact your supplier.
The heater will usually be supplied mounted
on a pallet and wrapped in heavy gauge
polythene. Nozzle heads will be supplied
separately. Oil fired heaters will have the
associated oil filter and fire valve separately
supplied.
After unpacking the appliance leave it
fastened to the pallet until just before siting
to prevent damage to the unit.
Read this booklet and become familiar with
the installation requirements of your unit.
Check if the local distribution conditions
of electricity supply, type of gas or oil and
pressure of the appliance are compatible
with the data plate.
The appliance must be installed in
accordance with the current rules in force
and any local or national regulations.
The requirements of the “Local Building
Standards office”, the premises “Insurance”
undertaking and the “Fire Office” must also
be observed.
Before commencing installation, ensure all
necessary supplies, tools and manpower are
available.
Prior to installation, the assembly of the
heater should be completed, it is advisable
that this is undertaken in the area where
the heater is scheduled to be sited.
It is strongly advised that when
positioning the heater the lifting
eyes are used, thereby reducing
the risk of inadvertent damage
being occasioned to the heater.
Handling
Handling must only be carried out by a
qualified engineer. If a fork-lift is used, fork
the appliance using the appropriate ways
in the wood pallet. Use forklift forks with a
minimum length equal to the width of the
machine.
Shipping and handling must be carried out
with extreme care to avoid damage to the
unit and danger to the persons involved.
During transportation and handling, it is
forbidden to stand near the unit.
If belts or ropes are used, a rocker arm
(not included) must be used to prevent
the pressure exerted by the same from
damaging the structure of the unit.
If the heater needs to be moved by hand,
make sure that there is enough workforce
available in proportion with the weight
indicated in the Technical Data table on
page 15 and depending on the distance to
be covered.
Suitable personal protective equipment
(PPE) including safety boots, gloves and eye
protection must be worn for all uncrating,
preparation and handling activity.
INSTALLATION

Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0 PAGE 19
Installation considerations
The installation location must be
determined by the system designer and/
or by a competent person able to take into
account technical requirements and the
standards and regulations in force.
Generally, special permissions need to
be obtained (e.g. regulations concerning
zoning, architecture, fire safety,
environmental pollution, noise emission,
etc.).
Under no circumstances should
any item be placed on or above
any part of the heater, whether it
is being used or not.
All basic criteria must be satisfied
prior to commencing the
installation and commissioning
process.
All heaters must be earthed.
Flue requirements may affect
the location of the heater. Refer
to the “Combustion air supply/
flue arrangement” section before
making a final determination.
The flue pipe and accessible heater
surfaces will be hot under normal
operation and will cause burns if
touched. Locate the heater such
that these components cannot be
touched if at all possible.
The heater must be positioned
and installed to comply with all
relevant standards and guidelines
and should also meet the local
and national fire regulations and
insurance criteria, this is critical
if the heater is to be installed
within a special risk area (e.g.
being; within close proximity to
where petrol engined vehicles are
stored or parked, where cellulose
spraying takes place, where
woodworking machinery is being
operated, etc.).
The heater must not be installed
within an area with unsuitable
conditions, e.g. where the
atmosphere is highly corrosive, has
a high degree of salinity, or where
high wind velocities may affect
burner operation.
Suitable protection should be
provided for the appliance when
it is located in a position where
it may be susceptible to external
mechanical damage; for example,
fork lift trucks, overhead cranes
etc.
The location chosen for the heater
must allow for the fitting of an
effective flue system.
To properly install the heater, bear
in mind that it should:
• Be installed on a level non-combustible
surface capable of supporting the
weight of the heater and any ancillary
equipment;
• Be supported over the entire perimeter
of the lower base;
• Be placed on a surface whose deflection
and strength is such that it can prevent
vibrations from reaching underneath;
• Be easily and safely accessible without
the need for special equipment (ladders,
mobile platforms, etc.);
• Respect the clearance distances in
order to allow for a correct flow of air
and normal cleaning and maintenance
operations;
• Maintain the safety distances from
flammable material;
• Be placed close to a flue;
• Be able to be connected to the fuel
source;
• Be close to a suitably sized electrical
supply;
• Allow for easy maintenance and
inspections;

PAGE 20 Reznor, COMET+, Installation Manual, EN 2023-03, D301518 Iss 0
• Be fitted with the ventilation openings
required by the relevant regulations.
Do Not Install the Unit:
• In places where there is an aggressive
atmosphere;
• In tight spaces where the sound level
of the heater can be increased by
reverberation or echoes;
• In corners where leaves could
accumulate or where other objects could
clog the air passage and reduce the
heater efficiency;
• In pressurised places;
• In de-pressurised places;
• Outdoors, unless the unit has been
supplied with a casing suitable for
external installation.
The base on which the heater is positioned
should not be less than 150mm (6 inches)
thick and must be constructed of non-
combustible material. Any combustible
material adjacent to the heater and the flue
system must be placed or shielded as to
ensure that its temperature does not exceed
65ºC.
Clearances and access
The following clearances for installation and
service access must be observed:-
In front of the heater Equal to the depth
of the heater
Behind the heater 1.0m minimum
To the burner side of the heater 1.0m minimum
Above the heater 1.0m minimum
If the heater is to be fitted at a height, then
the structure of the gantry must be capable
of the heaters weight (which can be found
in the technical data table on page 15). In
this instance, a safe working platform and
access must be allowed for to enable easy
and safe working access.
Combustion air/ventilation
requirements
Sufficient ventilation for combustion air
purposes needs to be provided to the room
in which the heater is sited. A full and
unobstructed air path to the heater air inlet
must be provided.
Where the heater is installed in a plant
room, combustion air should be provided via
permanent air vents connecting directly with
the outside air at high level and low level
within the room. The minimum ventilation
free areas for high and low level vents are
given below:-
Low Level 540cm² plus 4.50cm² per kW after 60kw
High Level 270cm² plus 2.25cm² per kW after 60kw
Where communication with the outside
air is possible only by means of high level
air vents, ducting down to floor level for
the lower vent(s) should be used. Air vents
should have negligible resistance and must
not be sited in any position where they are
likely to be easily blocked or flooded, or
in any position adjacent to an extraction
system, which is carrying flammable vapour.
Grilles or louvres should be designed so that
high velocity air streams do not occur within
the plant room.
The ventilation should be installed in
accordance with local and national codes.
Flue system
The cabinet heaters are designated as a
Type B23 forced draught appliance where
the combustion air is taken from the room
space the heater is installed in and requires
only a flue pipe exhausting the products of
combustion to outdoors.
The heaters are designed to operate safely
and efficiently with a vertical flue system
or for models up to size 150 a horizontal
flue system (see diagram on page 24)
when installed according to the specific
requirements and instructions herein.