MrHeater Heatstar HSU45 User manual

06/10 Rev. Cmh #60017Mr. Heater, Inc., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 216-916-3000
READ INSTRUCTIONS CAREFULLY: Read and
follow all instructions. Place instructions in a
safe place for future reference. Do not allow
anyone who has not read these instructions to
assemble, light, adjust or operate the heater.
MODEL
MODEL
FUEL CONVERSION MANUAL
MR. HEATER HEATSTAR
HSU45
HSU75
COMPACT UNIT HEATER
MHU45
MHU75
Improper installation, adjustment, alteration, service or maintenance
can cause injury or property damage. Refer to this manual. For additional information
consult a qualified installer, service agency or the gas supplier.
WARNING:
— WHAT TO DO IF YOU SMELL GAS
•Open Windows
•DO NOT try to light any appliance.
•DO NOT use electrical switches.
•DO NOT use any telephone in your house. Immediately call your local gas supplier from a
neighbor’s telephone. Follow the gas supplier’s instructions.
•Do not touch any electrical switch; do not use any phone in your building.
•Installation and service must be performed by a qualified installer, service agency or the gas
supplier.
•If you cannot reach your gas supplier, call the Fire Department.
FOR YOUR SAFETY:
Do not store or use gasoline or other flammable vapors and liquids in the
vicinity of this or any other appliance.
WARNING: If the information in these instructions are not followed exactly, a fire or
explosion may result causing property damage, personal injury or loss of life.
LANGUAGES
ENGLISH
Pages E1 — E8
SPANISH
Pages S1 — S8
FRENCH
Pages F1 — F8

E-2
Compact Unit Heater Fuel Conversion Manual
WARNING:
YOUR SAFETY IS IMPORTANT TO YOU AND TO OTHERS,
SO PLEASE READ THESE INSTRUCTIONS BEFORE YOU
OPERATE THIS HEATER.
CONTENTS
Fuel Conversion Kits...............................................................E-3
Fuel Conversion Instructions...................................................E-4
Rating Tag Conversion............................................................E-6
Warranty................................................................................E-8
WARNING
THIS CONVERSION KIT SHALL BE INSTALLED BY
A QUALIFIED SERVICE AGENCY IN ACCORDANCE
WITH THE MANUFACTURER'S INSTRUCTIONS AND
ALL APPLICABLE CODES AND REQUIREMENTS
OF THE AUTHORITY HAVING JURISDICTION. IF
THE INFORMATION IN THESE INSTRUCTIONS IS
NOT FOLLOWED EXACTLY, A FIRE, EXPLOSION OR
PRODUCTION OF CARBON MONOXIDE MAY RESULT
CAUSING PROPERTY DAMAGE, PERSONAL INJURY
OR LOSS OF LIFE. THE QUALIFIED SERVICE AGENCY
PERFORMING THIS WORK ASSUMES RESPONSIBILITY
FOR THE PROPER CONVERSION OF THIS APPLIANCE
WITH THIS KIT.
WARNING:
FIRE, BURN, INHALATION, AND EXPLOSION HAZARD.
KEEP SOLID COMBUSTIBLES, SUCH AS BUILDING
MATERIALS, PAPER OR CARDBOARD, A SAFE DISTANCE
AWAY FROM THE HEATER AS RECOMMENDED BY THE
INSTRUCTIONS NEVER USE THE HEATER IN SPACES
WHICH DO OR MAY CONTAIN VOLATILE OR AIRBORNE
COMBUSTIBLES, OR PRODUCTS SUCH AS GASOLINE,
SOLVENTS, PAINT THINNER, DUST PARTICLES OR UN-
KNOWN CHEMICALS.
GENERAL HAZARD WARNING:
FAILURE TO COMPLY WITH THE PRECAUTIONS AND
INSTRUCTIONS PROVIDED WITH THIS HEATER, CAN
RESULT IN DEATH, SERIOUS BODILY INJURY AND
PROPERTY LOSS OR DAMAGE FROM HAZARDS OF FIRE,
EXPLOSION, BURN, ASPHYXIATION, CARBON MONOX-
IDE POISONING, AND/OR ELECTRICAL SHOCK.
ONLY PERSONS WHO CAN UNDERSTAND AND FOLLOW
THE INSTRUCTIONS SHOULD USE OR SERVICE THIS
HEATER.
IF YOU NEED ASSISTANCE OR HEATER INFORMATION
SUCH AS AN INSTRUCTIONS MANUAL, LABELS, ETC.
CONTACT THE MANUFACTURER.
WARNING:
The State of California requires the following warn-
ing: COMBUSTION BY-PRODUCTS PRODUCED WHEN
USING THIS PRODUCT CONTAIN CARBON MONOXIDE,
A CHEMICAL KNOWN TO THE STATE OF CALIFORNIA
TO CAUSE CANCER AND BIRTH DEFECTS (OR OTHER
REPRODUCTIVE HARM).

Fuel Conversion ManualCompact Unit Heater E-3
Gas Conversion Labels: Spring (Red) - w/Label and Cap
P/N (see Table below)
Contents of Fuel Conversion Kits (Natural - to - L.P.)
Part Number Description Conversion Kit Part Numbers
MHU/HSU-45 MHU/HSU-75
13575 Gas Conversion Label 1 1
60011-10 Rating Tag 1
6011-23 Rating Tag 1
02877 Spring (Red) - Gas Valve (Label Included) 1 1
60056 L.P. Ori¯ce (Stamped 046) 3 5
13576 Control Conversion Label 1 1
For Natural - to L.P. Gas Conversions
Fuel Conversion Kit Part Numbers
Model No. BTU/hr Natural-To-L.P.
MHU/HSU-45 45,000 F260067
MHU/HSU-75 75,000 F260069
Section 1 FUEL CONVERSION KITS
Gas Conversion Labels: Spring (Orange) - w/Label and Cap
P/N (see Table below)
Contents of Fuel Conversion Kits (L.P - to - Natural)
Part Number Description Conversion Kit Part Numbers
MHU/HSU-45 MHU/HSU-75
13575 Gas Conversion Label 1 1
60010-11 Rating Tag 1
60123-11 Rating Tag 1
02878 Spring, Kit for Valve 1
60049 3 5
13576 Control Conversion Label 1 1
For L.P. - to - Natural Gas Conversions
Fuel Conversion Kit Part Numbers
Model No. BTU/hr L.P.-To-Natural
MHU/HSU-45 45,000 F260066
MHU/HSU-75 75,000 F260071
L.P.
REG
N.G.
REG

E-4
Compact Unit Heater Fuel Conversion Manual
See Figure 1
Section 2 FUEL CONVERSION INSTRUCTIONS
Figure 1
WARNING: Explosion Hazard
Turn off the gas supply to the heater
before performing any service or
maintenance.
Failure to follow these instructions will
result in death, injury or property damage.
WARNING: Electrical Shock Hazard
Unplug the electrical cord from the outlet
before performing any service
maintenance.
Failure to follow these instructions will
result in death, injury or property damage.
2
6
4 5
Step 1.
Caution the gas supply shall be shut off prior to disconnecting
the electrical power, before proceeding with the conversion.
Step 2.
Remove and discard cap from gas valve/regulator with a flat blade
screw driver by turning the cap counter-clockwise. Remove the
regulator adjustment screw in the same manner. Do not discard
the screw after removing. Remove and discard the spring that is
located under the adjustment screw. Remove the spring kit from the
conversion kit, and compare the part number of the kit to the parts
you are converting, install the new spring with the adjustment screw
about (5) full rotations in the clockwise direction. Place conversion
label supplied with the spring kit on the valve near the adjustment
screw cover.
Step 3.
After converting the valve, remove the gas supply line to the unit
and remove the manifold by turning the four screws in a counter-
clockwise direction. This will allow the valve and manifold to pull
straight out from the burners.
Step 4.
Remove the three orifices from the manifold with a ½” open end
wrench. Turn them counter-clockwise to remove. Take the new
number stamped on the side of the orifice matches the number for
the kit you are using. If it does not, immediately contact Mr. Heater,
manifold, using caution not to cross thread.
Step 5.
Replace the manifold in the unit and reconnect incoming gas supply
line. Check all connections for leaks with soapy water.
Step 6.
port. See Figure 2. Pressure gauges are not reliable and may give a
false reading.
The electrode and sensor are not adjustable.
DO NOT change location or position as part of
this conversion kit.

Fuel Conversion ManualCompact Unit Heater E-5
See Figure 2
Step 7
Reconnect thermostat, connect in main power supply, and turn main
gas supply on.
Step 8
Turn up thermostat to call for heat.
Step 9
When burner lights, set the manifold gas pressure by turning the
adjustment screw that holds the regulator spring that was replaced
in step 6, of the unit covers.
Decrease Pressure Increase Pressure
Counter Clock Wise Clock Wise
The Natural Gas unit should be set to (4” W.C.) and the LP unit
should be set to (10” W.C.). The manometer illustration
(See Figure 2) shows each of the pressure readings.
Figure 2
N.G. L.P.
6
5
4
3
2
1
0
1
2
3
4
5
6
6
5
4
3
2
1
0
1
2
3
4
5
6
4" 10"
Step 10
Turn down thermostat, disconnect main power, and turn main gas
off to appliance.
Step 11
Disconnect manometer from appliance and replace test plug on
valve.
Step 12
Connect main power, turn main gas back on, and turn up
thermostat to call for heat. When main burner lights check all
connections thoroughly for gas leaks.
Allow the heater to operate for at least 5 minutes, then observe
the main burner flame. A hard blue flame extending into the
tube is normal. Slight yellow tipping is acceptable. There is no air
adjustment on burner.
Step 13
To ensure the correct rate is obtained, the orifice size should be
verified during and after installation. The orifice size for Natural Gas
is (.074”) and for LP the size is (.046”). These sizes are stamped on
the side of the orifice. There are three (3) orifices for the
MHU/HSU-45 heaters and five (5) orifices for the MHU/HSU-75
heaters. The manifold pressure should be verified after installation
so that a natural gas pressure of (4”WC) or an LP pressure of (10”WC)
is obtained. Enerco Group Inc is confident that with proper orifices and
correct manifold pressure, your MHU/HSU heater will be operating at
its correct BTU rating.

E-6
Compact Unit Heater Fuel Conversion Manual
Section 3 RATING TAG CONVERSION
Figure 3
See Figure 3
Step 14
See Figure 3. Remove the data tag P/N 60011-10 or 60010-11 for their
respective gases. Remove label and place over the existing portion of
the tag. This label is pre-printed with all the correct information.
Step 15
information. Then place this tag below the updated rating tag on the
converted unit.
Figure 4
INLET PRESSURES:
Natural Gas
MAX - 14"WC (3.49kPa)
MIN - 5"WC (1.25 kPa)
Propane
MAX - 14" WC (3.49 kPa)
MIN - 11"WC (2.74 kPa)
Figure 5
NATURAL GAS MANIFOLD PRESSURES - IN.WG. (KPA)
MHU45/75
HSU 45/75
ALTITUDE FT. (M)
0-2000 2000-4500
(0-610) (610-1370)
45/75 4.0 (0.99)* 3.6 (0.89)
*No adjustment required.
Figure 6
LP/PROPANE GAS MANIFOLD PRESSURES - IN.WG. (KPA)
MHU45/75
HSU 45/75
ALTITUDE FT. (M)
0-2000 2000-4500
(0-610) (610-1370)
45/75 10 (2.49)* 8.0 (1.99)
*No adjustment required.

Fuel Conversion ManualCompact Unit Heater E-7
THIS PAGE INTENTIONALLY LEFT BLANK.

E-8
Compact Unit Heater Fuel Conversion Manual
WARNING:
USE ONLY MANUFACTURER’S REPLACEMENT PARTS. USE OF ANY OTHER PARTS
COULD CAUSE INJURY OR DEATH. REPLACEMENT PARTS ARE ONLY AVAILABLE
DIRECT FROM THE FACTORY AND MUST BE INSTALLED BY A QUALIFIED SERVICE
AGENCY.
PARTS ORDERING INFORMATION:
PURCHASING: Accessories may be purchased at any Mr. Heater local dealer or direct
from the factory
FOR INFORMATION REGARDING SERVICE
Please call Toll-Free 800-251-0001 • www.mrheater.com
Our office hours are 8:30 AM – 5:00 PM, EST, Monday through Friday.
Please include the model number, date of purchase, and description of problem in all
communication.
LIMITED WARRANTY
The company warrants this product to be free from imperfections in material or workmanship,
under normal and proper use in accordance with instructions of The Company, for a period of
one year from the date of delivery to the buyer. The Company, at its option, will repair or replace
products returned by the buyer to the factory, transportation prepaid within said one year period
and found by the Company to have imperfections in material or workmanship.
If a part is damaged or missing, call our Technical Support Department at 800-251-0001.
Address any Warranty Claims to the Service Department, Mr. Heater, Inc., 4560 W. 160TH ST.,
CLEVELAND, OHIO 44135. Include your name, address and telephone number and include
details concerning the claim. Also, supply us with the purchase date and the name and address
of the dealer from whom you purchased our product.
The foregoing is the full extent of the responsibility of the Company. There are no other
warranties, express or implied. Specifically there is no warranty of fitness for a particular purpose
and there is no warranty of merchantability. In no event shall the Company be liable for delay
caused by imperfections, for consequential damages, or for any charges of the expense of
any nature incurred without its written consent. The cost of repair or replacement shall be the
exclusive remedy for any breach of warranty. There is no warranty against infringement of the
like and no implied warranty arising from course of dealing or usage of trade. This warranty
will not apply to any product which has been repaired or altered outside of the factory in any
respect which in our judgment affects its condition or operation.
Some states do not allow the exclusion or limitation of incidental or consequential damages, so
the above limitation or exclusion may not apply to you. This Warranty gives you specific legal
rights, and you may have other rights which vary from state to state.
Mr. Heater, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 216-916-3000
Mr. Heater is a registered trademarks of Mr. Heater, Inc.
© 2009, Mr. Heater. All rights reserved
ANSI Z83.8/CGA 2.6-2009
UNIT HEATER
CSA .10.96 U.S. (2ND ED.)
UNIT HEATER FOR RESIDENTIAL INSTALLATION
CATEGORY/CATEORIE I
Mr. Heater, Inc. reserves the right to make changes at any time, without notice or obli-
gation, in colors, specifications, accessories, materials and models.
READ INSTRUCTIONS CAREFULLY: Read and
follow all instructions. Place instructions in a
safe place for future reference. Do not allow
anyone who has not read these instructions to
assemble, light, adjust or operate the heater.
MHU45
MHU75
MODEL
MODEL
FUEL CONVERSION MANUAL
MR. HEATER HEATSTAR
HSU45
HSU75

Rev. 06/10 Cmh #60017Mr. Heater, Inc., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 216-916-3000
LEA LAS INSTRUCCIONES DETENIDAMENTE:
Lea y siga todas las instrucciones. Guarde las
instrucciones en un lugar seguro en caso de que
necesite consultarlas en un futuro. No permita
que nadie que no haya leído estas instrucciones
ensamble, encienda, ajuste u opere el calentador.
MODELO
MODELO
MANUAL DE CONVERSIÓN DE COMBUSTIBLE
MR. HEATER HEATSTAR
HSU45
HSU75
CALENTADOR COMPACTO
MHU45
MHU75
La instalación, el ajuste, la alteración, la reparación o el
mantenimiento indebidos pueden ocasionar lesiones o daños a la propiedad.
Consulte este manual. Para obtener información adicional, consulte con un instalador
calificado, una agencia de reparación o el suministrador de gas.
ADVERTENCIA:
— QUÉ HACER SI DETECTA OLOR A GAS
•Abra las ventanas.
•NO intente encender ningún artefacto.
•NO utilice interruptores eléctricos.
•NO utilice los teléfonos de su hogar. Llame de inmediato al suministrador de gas desde el
teléfono de un vecino. Siga las instrucciones del suministrador de gas.
•NO toque ningún interruptor eléctrico ni use ningún teléfono del edificio.
•La instalación y el mantenimiento deben ser realizados por un instalador calificado, una
agencia de reparación calificada o el suministrador de gas.
•Si no puede comunicarse con el suministrador de gas, llame al departamento de bomberos.
PARA SU SEGURIDAD:
No almacene ni utilice gasolina ni otros vapores y líquidos inflamables en las
proximidades de este artefacto ni de ningún otro artefacto.
ADVERTENCIA: Si no se sigue la información de estas instrucciones con exactitud,
puede producirse un incendio o una explosión y ocasionar daños a la propiedad,
lesiones personales o la muerte.
LANGUAGES
ENGLISH
Pages E1 — E8
SPANISH
Pages S1 — S8
FRENCH
Pages F1 — F8

S-2
Calentador compacto Manual de conversión de combustible
ADVERTENCIA:
LA SEGURIDAD ES IMPORTANTE PARA USTED Y PARA
OTRAS PERSONAS; LEA LAS INSTRUCCIONES ANTES DE
OPERAR EL CALENTADOR.
CONTENIDO
Juegos de conversión de combustible ....................................S-3
Conversión de etiquetas de clasificación .................................S-4
Conversión de etiquetas de clasificación .................................S-6
Garantía.................................................................................S-8
ADVERTENCIA
LA INSTALACIÓN DE ESTE JUEGO DE CONVERSIÓN DEBE
ESTAR A CARGO DE UNA AGENCIA DE REPARACIÓN
CALIFICADA DE ACUERDO CON LAS INSTRUCCIONES
DEL FABRICANTE Y CON TODOS LOS CÓDIGOS Y
REQUISITOS QUE ESTABLEZCA LA AUTORIDAD QUE
POSEA JURISDICCIÓN. SI NO SE SIGUE CON EXACTITUD
LA INFORMACIÓN DE ESTAS INSTRUCCIONES, PUEDE
PRODUCIRSE UN INCENDIO, UNA EXPLOSIÓN O
LA EMANACIÓN DE MONÓXIDO DE CARBONO, LO
QUE PODRÍA OCASIONAR DAÑO A LA PROPIEDAD,
LESIONES PERSONALES O LA MUERTE. LA AGENCIA DE
REPARACIÓN CALIFICADA QUE REALICE ESTE TRABAJO
ASUME LA RESPONSABILIDAD DE LA CONVERSIÓN
CORRECTA DE ESTE ARTEFACTO CON ESTE JUEGO.
ADVERTENCIA
PELIGRO DE INCENDIO, QUEMADURAS, INHALACIÓN
Y EXPLOSIÓN. LOS COMBUSTIBLES SÓLIDOS, COMO
MATERIALES DE CONSTRUCCIÓN, PAPEL O CARTÓN,
DEBEN MANTENERSE A UNA DISTANCIA ADECUADA
DEL CALENTADOR, SEGÚN SE RECOMIENDA EN LAS
INSTRUCCIONES. NO UTILIZAR NUNCA EL CALEN-
TADOR EN ESPACIOS QUE CONTENGAN O PUEDAN
CONTENER COMBUSTIBLES VOLÁTILES O AEROTRANS-
PORTADOS, O PRODUCTOS COMO GASOLINA, SOL-
VENTES, DILUYENTE PARA PINTURAS, PARTÍCULAS DE
POLVO O QUÍMICOS DESCONOCIDOS.
ADVERTENCIA SOBRE PELIGROS
GENERALES:
NO CUMPLIR CON LAS PRECAUCIONES O
INSTRUCCIONES QUE SE INCLUYEN CON EL
CALENTADOR PUEDE OCASIONAR LA MUERTE,
GRAVES LESIONES FÍSICAS Y DAÑO O PÉRDIDA DE
BIENES COMO CONSECUENCIA DE UN INCENDIO,
UNA EXPLOSIÓN, QUEMADURAS, ASFIXIA,
ENVENENAMIENTO POR MONÓXIDO DE CARBONO O
DESCARGA ELÉCTRICA.
EL CALENTADOR DEBERÁ SER USADO Y REVISADO
SÓLO POR PERSONAS QUE COMPRENDAN Y PUEDAN
SEGUIR LAS INSTRUCCIONES.
SI NECESITARA ASESORAMIENTO O INFORMACIÓN
SOBRE EL CALENTADOR, COMO UN MANUAL DE
INSTRUCCIONES, ETIQUETAS, ETC., COMUNÍQUESE
CON EL FABRICANTE.
ADVERTENCIA:
El Estado de California exige la publicación de la
siguiente advertencia: LA COMBUSTIÓN GENERADA
CUANDO SE UTILIZA ESTE PRODUCTO CONTIENE
MONÓXIDO DE CARBONO, UN QUÍMICO QUE EL
ESTADO DE CALIFORNIA RECONOCE COMO CAUSANTE
DE CÁNCER Y MALFORMACIONES CONGÉNITAS (U
OTROS DAÑOS REPRODUCTIVOS).