Mr. Heater Heatstar HSU45, MHU45, MHU75, Heatstar HSU75 Conversion Manual
FUEL CONVERSION MANUAL
MR. HEATER
MODEL
MHU45
MHU75
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.
HEATSTAR
MODEL
LANGUAGES
ENGLISH
Pages E1 — E8
SPANISH
Pages S1 — S8
HSU45
HSU75
COMPACT UNIT HEATER
WARNING:
Improper installation, adjustment, alteration, service or maintenance
FRENCH
Pages F1 — F8
can cause injury or property damage. Refer to this manual. For additional information
consult a qualified installer, service agency or the gas supplier.
— 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.
06/10 Rev. Cmh #60017Mr. Heater, Inc., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 216-916-3000
WARNING:
YOUR SAFETY IS IMPORTANT TO YOU AND TO OTHERS,
SO PLEASE READ THESE INSTRUCTIONS BEFORE YOU
OPERATE THIS HEATER.
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 MONOXIDE 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).
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 UNKNOWN CHEMICALS.
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.
CONTENTS
Fuel Conversion Kits ...............................................................E-3
Fuel Conversion Instructions ...................................................E-4
Rating Tag Conversion ............................................................E-6
Warranty ................................................................................E-8
Compact Unit Heater Fuel Conversion Manual
E-2
Section 1 FUEL CONVERSION KITS
Fuel Conversion Kit Part Numbers
Model No. BTU/hr Natural-To-L.P.
MHU/HSU-45 45,000 F260067
For Natural - to L.P. Gas Conversions
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
MHU/HSU-75 75,000 F260069
L.P.
REG
Fuel Conversion Kit Part Numbers
Model No. BTU/hr L.P.-To-Natural
MHU/HSU-45 45,000 F260066
For L.P. - to - Natural Gas Conversions
Gas Conversion Labels: Spring (Orange) - w/Label and Cap
P/N (see Table below)
MHU/HSU-75 75,000 F260071
N.G.
REG
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
13576 Control Conversion Label 1 1
3 5
E-3
Fuel Conversion ManualCompact Unit Heater
Section 2 FUEL CONVERSION INSTRUCTIONS
Figure 1
2
4 5
6
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.
See Figure 1
The electrode and sensor are not adjustable.
DO NOT change location or position as part of
this conversion kit.
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 counterclockwise 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 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
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.
Compact Unit Heater Fuel Conversion Manual
E-4
Figure 2
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.
Step 10
Turn down thermostat, disconnect main power, and turn main gas
off to appliance.
6
5
4
3
2
1
4"
0
1
2
3
4
5
6
6
5
4
3
2
1
10"
0
1
2
3
4
5
6
N.G. L.P.
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-5
Fuel Conversion ManualCompact Unit Heater
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)
ALTITUDE FT. (M)
MHU45/75
HSU 45/75
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)
ALTITUDE FT. (M)
MHU45/75
HSU 45/75
0-2000 2000-4500
(0-610) (610-1370)
45/75 10 (2.49)* 8.0 (1.99)
*No adjustment required.
Compact Unit Heater Fuel Conversion Manual
E-6
THIS PAGE INTENTIONALLY LEFT BLANK.
E-7
Fuel Conversion ManualCompact Unit Heater
FUEL CONVERSION MANUAL
MR. HEATER
MODEL
MHU45
MHU75
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.
HEATSTAR
MODEL
HSU45
HSU75
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 Depa
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.
rtment at 800-251-0001.
Mr. Heater, Inc. reserves the right to make changes at any time, without notice or obligation, in colors, specifications, accessories, materials and models.
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., 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
Compact Unit Heater Fuel Conversion Manual
E-8
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