MHT 45
Model #
OPERATING INSTRUCTIONS
MHT 45
AND OWNER’S MANUAL
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.
Gas-Fired, Low-Intensity Infrared Heaters
approved for residential Garage/Commercial Applications
WARNING:
can cause injury or property damage. Refer to this manual. For assistance or
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.
•
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.
Improper installation, adjustment, alteration, service or maintenance
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.
Enerco Group, Inc., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 216-916-3000
01/05 Revision L1 #02853
WARNING:
YOUR SAFETY IS IMPORTANT TO YOU AND TO OTHERS,
SO PLEASE READ THESE INSTRUCTIONS BEFORE YOU
OPERATE THIS HEATER.
L’AVERTISSEMENT:
Votre surete est importante a vous et donc s’il vous
plait lire ces instructions avant d’operer cet appareil de
chauffage.
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:
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.
L’AVERTISSEMENT:
Le feu, les brulures, le danger d’inhalation et explosion
garder combustibles solide tel que les materiels de
papier ou le carton.
Une distance sure eloigne de l’appareil chauffage
comme recommande.
Par les instructions, ne utiliser l’appareil de chauff-
age dans les espaces qui forme contenir combustibles
volatiil ou aeroporte, ou les produit qu’essence, les dissolvants, peindre plus mines, les particles de poussiere
ou les produits chimiques inconnus
L’AVERTISSEMENT GENERAL DE DANGER:
L’Echec pour se conformer aux precautions et aux in-
structions a fourni avec cet appareil de chauffage, avoir
pour resultat la mort blessure et la perte de propriete
ou les dommages physiques serieuses du danger de feu,
l’explosion, la brulure l’asphyxie, monoxide de carbone
empoisonant, et/ou le choc electrique.
Seulement les personnes qui peuvent comprendre et
peut suibre les instructions doivent utiliser ou doivent
entretenir cet appareil de chauffage.
Si vous avez besoin de l’information d’assistance ou ap-
pareil de chauffage telle qu’un manuel d’instruction, les
etiquettes,etc, contactez le fabricant
CONTENTS
Section 1 INTRODUCTION .............................................................. 3
Section 2 PLANNING ..................................................................... 6
Section 3 INSTALLATION ................................................................ 8
Section 4 VENTING .......................................................................12
Section 5 OPERATION .................................................................. 18
Section 6 MAINTENANCE ............................................................ 19
Section 7 TROUBLESHOOTING ..................................................... 20
Section 8 ILLUSTRATED PARTS ..................................................... 22
WARRANTY ................................................................................. 24
INSTRUCTIONS FOR ORDERING PARTS ......................................... 24
WARNING:
The State of California requires the following warning:
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 REPRO-
DUCTIVE HARM).
L’AVERTISSEMENT:
L’etat de Californie exige les avertissement siuvants.
Derives de combustion ont produit en utilisant ce produit
contient monoxide de carbone, un chimique/gaz connu
dans l’etat de californie pour causer les defauts de cancer
et naissance (ou autre le mal reproducteur)
Mr. Heater | Gas-Fired Low-Intensity Infrared Heater Operating Instructions and Owner’s Manual
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BEFORE YOU BEGIN
Read this manual carefully before installing or servicing this
equipment. Improper installation, servicing or maintenance will
cause death, injury or property damage. Check the minimum
required safe distances from combustibles given on the outside
of each burner to make sure that the product is suitable for your
application. The minimum required safe distances from combustibles
is also found on page 9 of this manual. Installer must be a licensed
contractor of representative. After the installation is complete, check
product operation as provided in these instructions.
Unpacking the Heater
Manpower Requirements
To prevent personal injury and damage to the heater, two persons
will be required to remove the heater from the carton. Both ends of
the heater should be lifted from the carton at the same time. The
burner box should be lifted by gripping the bottom of the box. The
reector end of the heater should be lifted using the rear moveable
hanger.
Safety
Thin sheet metal parts, such as the reector portion of the heater
and the various venting components, have sharp edges. To prevent
injury, the use of work gloves is recommended. The use of gloves
will also prevent the transfer of body oils from the hands to the
surface of the reector.
Available Accessories
Vent Kit (F102840)
1. (2) 3" x 2' Pipe 26GA.
2. (1) 36" x 3" B-Vent
3. (1) Gas Vent Top 3"
4. (1) Adj. Wall Thimble
5. (1) Storm Collar
6. (1) 3" Elbow
7. (1) Adj. Roof Flashing
1
2
3
4
5
6
7
Section 1 INTRODUCTION
About The Heater
The MHT 45 is a factory-assembled, gas red, low-intensity heating
system. The system has been designed for easy installation and will
provide years of economical operation and trouble-free service. Not
only is infrared heat efcient, it also provides the most comfortable
conditions in open areas, such as garages.
Gas-Fired means it uses clean-burning Natural or LP gas.
Low-Intensity means that the radiant surface of the heat exchanger
tube does not glow red. Instead, it operates at a lower temperature
(less than 1000 F) and radiates energy at a lower intensity per square
foot of radiating surface. The lower temperature and intensity
levels are within a range that is most effective in establishing and
maintaining personal comfort levels. An aluminum reector directs
the radiant energy downward to the occupied area.
Radiant refers to the energy radiated by the tube heater. Because
the energy is in the form of infrared rays, it does not directly heat the
air. Instead, the rays heat objects such as the oor, cars, machines
and people. The warm objects, in turn, heat the air. These combined
features are the key to the exceptional comfort and fuel efciency
provided by the tube heater.
Operating Instructions and Owner’s ManualMr. Heater | Gas-Fired Low-Intensity Infrared Heater
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About The Heater
Burner Box
Front Fixed Hanger
Reflector
Exhaust Vent
Heat Exchanger
Intake Vent
1/2" NPT
Power Cord
- Rear View -
Rear Movable Hanger
Control Side
Access
Burner Box Contains the electrical components (i.e. blower motor, power transformer, etc.) and gas distribution components
(i.e. gas valve, etc.) that make the heater work. There are no owner serviceable items contained in this box.
Front Fixed Hanger Provides rigid support and mounting surface for the reector. Holes are provided in the upper corners of the
bulkhead to accommodate suspension hardware required for installation of the heater.
Reector The reector is made from formed aluminum and reects the radiant energy downward to the space to be
heated.
Heat Exchanger A U-shaped tube through which the heated products of combustion pass.
Rear Movable Hanger Provides support for the heat exchanger and reector at the end that is furthest from the burner box. The
support may be moved (within limits) to accommodate hanging of the unit.
Service Door To be removed only by a licensed contractor. Removal of this service door provides access to the electrical and
gas distribution components.
Intake Vent Accomondates a 3" diameter combustion air inlet duct that delivers fresh air to the burner.
Exhaust Vent Accomondates the air-venting duct that carries the products of combustion to be vented outdoors.
Nipple – ½ NPT Point at which the gas supply is connected to the heater.
Power Cord Includes a three prong plug that must be connected to a dedicated and properly grounded three prong ceiling
outlet.
Mr. Heater | Gas-Fired Low-Intensity Infrared Heater Operating Instructions and Owner’s Manual
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Technical Specifications:
1/2"
11
Burner Box
Length
1" Max.
Reflector
Suspension Points
Heat
Exchanger
13
1/2
"
- Side View -
9"
Leading Particulars
Model No. BTU/hr Weight Length
MHT-45 45,000 96 lbs. 10’
HEATER SPECIFICATIONS
Electrical
Rating: 120VAC, 60Hz, single phase, 1 amp
Connection: 3 pin molded plug
Gas Inlet Connection
Connection ½” Male NPT
Gas Inlet Pressure
The minimum inlet gas supply pressure for the purpose of input
adjustment.
Natural Gas:
Minimum - Inlet 5.0” w.c.
Maximum - Inlet 10.5” w.c.
LP Gas (propane):
Minimum - Inlet 11.0” w.c.
Maximum – Inlet 13.0” w.c.
Manifold Pressure
Natural Gas: 4.0” w.c.
LP Gas (propane): 10.0” w.c.
VENTING SPECIFICATIONS
Vent/Flue
Length – 25 feet (Maximum)
5 feet (Minimum)
Flue Pipe – 3.0” diameter
Vent Pipe – 3” diameter
- End View -
Operating Instructions and Owner’s ManualMr. Heater | Gas-Fired Low-Intensity Infrared Heater
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Where can the heater be installed?
The MHT tube heater is intended for installation in the following
areas:
• Residential applications, such as:
Section 2 PLANNING
General
This section provides the following information:
— garages
— greenhouses
— workshops
• Light industrial/commercial applications, such as:
— entranceways
— lobby areas
— Lunch rooms
— aircraft hangars (see Section 2 for restrictions)
— public garages ( see Section 2 for restrictions)
Where can’t the heater be installed?
The MHT tube heater is not intended for installation in the
following areas:
•Residential living or sleeping areas
•Basements
Installer’s responsibility
The MHT tube heater , as well as the gas and electrical supply,
and the venting of the heater must be installed in accordance with
applicable specications and codes. Only rms (or individuals) well
qualied in this type of work should install the system. Consult local
Building Inspectors, Fire Marshals for further guidance.
Use the information given in this manual together with the cited
codes and regulations to perform the installation. The installer must
furnish all needed materials that are not furnished as standard
equipment. It is also the installer’s responsibility to see that the
materials and installation methods used, result in a job that is
workmanlike in appearance and is in compliance with all applicable
codes and requirements to this manual. The installer must give this
manual to the owner.
•Denes the gas, electric and venting requirements for the
MHT tube heater.
•Species the national standards and applicable codes that
apply to the gas, electric and venting requirements.
•Species the national standards and applicable codes that
apply to non-residential installations.
Gas Service Requirements:
System Requirements
Inlet Connection
Connection: ½” Male NPT
Inlet Pressure
Natural Gas:
Minimum - Inlet 5.0” w.c.
Maximum – Inlet 10.5” w.c.
LP Gas (propane):
Minimum – Inlet 10.5” w.c.
Maximum – Inlet 13.0” w.c.
Manifold Pressure
Natural Gas: 4.0” w.c.
LP Gas (propane): 10.0” w.c.
Type of Gas
The type of gas appearing on the nameplate must be the type
of gas used. Installation must comply with local codes and
recommendations of the local gas company. United States: Refer
to National Fuel Gas Code, ANSI Z223.1 – latest revision, (same as
NFPA Bulletin 54). Canada: Refer to Can 1-B149.1: Installation Codes
for Gas Burning Appliances.
Gas Supply Lines
The size of the gas supply lines must comply with local codes and
recommendations of the local gas company. United States: Refer
to National Fuel Gas Code, ANSI Z223.1 – latest revision, (same as
NFPA Bulletin 54). Canada: Refer to CAN 1-B149.1: Installation Codes
for Gas Burning Appliances.
A 1/8” NPT plugged tap must be installed in the gas line connection
immediately upstream of the heater that is farthest from the gas
supply meter. The tap is required for checking system gas pressure.
Meter and Service
Meter and service must be large enough to handle all the heaters
being installed plus any other connected load. The gas line which
feeds the system must be large enough to supply the required gas
with a maximum pressure drop of ½” w.c. When gas piping is not
included in the layout drawing, the local gas supplier will usually help
in planning the gas piping.
Mr. Heater | Gas-Fired Low-Intensity Infrared Heater Operating Instructions and Owner’s Manual
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Electrical Service Requirements:
System Requirements
The MHT tube heater requires a grounded three-prong electrical
outlet to be installed within 18 inches of the rear surface of the
heater’s burner box. It is recommended that the outlet for the heater
be ceiling-mounted and should be on a dedicated circuit. DO NOT
use an electrical extension cord to operate the heater.
Heater Rating: 120 VAC, 60 Hz, Single Phase, 1 Amp
WARNING
Electrical Shock Hazard
Plug heater into grounded three-prong ceiling receptacle.
Do not cut or remove the grounding prong from this plug.
Do not use with an extension cord.
Failure to follow these instructions will result in death or
electrical shock.
ATTENTION
Risque d’electrocution
Brancher le cordon du radiateur sur un socie a 3 broches
et a la masse, situe au plafond.
Ne pas sectionner ou retirer la broche de masse de cette
prise.
N’utilliser aucun cable de rallonge.
Le non-respect de ces consignes peut entrainer mort ou
electrocution.
Grounding
The heater must be electrically grounded in accordance with the
following codes: United States: Refer to National Electrical Code
ANSI/NFPA-70 – latest revision. Wiring must conform to the most
current National Electrical Code and local ordinances. Canada: Refer
to Canadian Electrical Code, CSA C22.1 Part 1 – latest revision.
Venting Requirements:
System Requirements
The MHT tube heater must be installed with venting or with one
of the optional venting kits available from Enerco. DO NOT connect
this heater to a separate chimney. Gas appliances must not be
connected to a chimney ue serving a seperate solid-fuel burning
appliance. DO NOT common vent with any other fuel burning
appliance.
Maximum Length: 25 feet
Minimum Length: 5 feet
WARNING
Carbon Monoxide Hazard
Heater must be exhausted outside.
Use materials supplied.
Failure to follow these instructions will result in death or
injury.
ATTENTION
Risque de monoxyde de carbone
L echappement du radiateur doit s’effectuer a l’exterieur.
Utillisez le materiel fourni.
Le non-respect de ces consignes peut entrainer mort ou
blessures.
Venting Codes
The location, size, installation and termination of vents, as well as
the minimum required safe distances when penetrating combustible
walls, must comply with local codes and recommendations of the
local gas company. United States: Refer to National Fuel Gas Code,
ANSI Z223.1 – latest revision, (same as NFPA Bulletin 54). Canada:
Refer to Can 1-B149.1 : Installation Codes for Gas Burning Appliance.
Non-residential Installations:
Aircraft Hangars
The MHT tube heater may be used in certain areas of aircraft
hangars. Installation in aircraft hangars must be in accordance with
the following codes: United States: Refer to Standard for Aircraft
Hangars, ANSI/NFPA-409 – latest revision. Canada: Refer to Standard
CGA B149-1M91.
Heaters in aircraft storage or service areas must be installed a
minimum of 10 feet above the upper surface of wings or engine
enclosures of the highest aircraft which may be housed in the
hangar. (This should be measured from the bottom of the heater to
the top of the wing, or engine enclosure, whichever is highest from
the floor).
In other sections of aircraft hangars, such as shops or ofce, heaters
must be installed a minimum of 8 feet above the oor.
Heaters installed in aircraft hangars shall be located so as not to be
subject to damage by aircraft, cranes, movable scaffolding or other
objects.
When installed over hoists, the minimum required safe distances to
combustibles must be maintained from the uppermost point of the
combustible materials placed on the hoist.
Public Garages
The MHT tube heater may be used in public garages. Installation
in public garages must be in accordance with the following codes:
United States: Standard for Parking Structures NFPA-88A – Latest
revision, or the Standard for Repair Garages, NFPA-88B – latest
revision. Canada: Refer to Can 1-B149.1: Installation Codes for Gas
Burning Appliances.
Heaters must be installed a minimum of eight feet above the
oor. Minimum required safe distances to combustibles must be
maintained from vehicles parked below the heater.
When installed over hoists, the minimum required safe distances to
combustible must be maintained from the uppermost point of the
combustible materials placed on the hoist.
Hazardous Locations
Where there is the possibility of exposure to combustible airborne
material or vapor, consult the local Fire Marshal, the Fire Insurance
Carrier or other authorities for approval of the proposed installation.
Operating Instructions and Owner’s ManualMr. Heater | Gas-Fired Low-Intensity Infrared Heater
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Section 3 INSTALLATION
WARNING
Several steps are involved in the installation of the heater.
DO NOT attempt to operate the heater until ALL steps of
the installation have been accomplished. Failure to follow
this warning will cause death, injury or property damage.
ATTENTION
Plusieur étapes sont impliquées dans l’installation de
l’appareil de chauffrage. PAS la tentative pour opérer
l’appareil chauffrage jusqu’à ce que TOUTES étapes de
l’installation ont été accomplies. L’echec pour suivre cet
avertissement causera la mort, les dommages de blessure
ou propriété.
Safety Equipment
Use of the following safety equipment is recommended for
installation of the MHT tube heater:
Installation Materials
Materials required for the installation of theMHT tube heater include
at a minimum the following:
• High temperature silicone sealant
• Suspension hooks (capable of supporting 150 pounds
each)
• Sheetmetal screws
The following items may be required for your particular installation:
• Plastic drain hose
• Additional vent pipe
• Roof ashing
• Rain collar
• Chain – 2/0, or equivalent
• S-hooks (as required)
• Work gloves
• Safety glasses
Installation Tools
Tools required for the installation of the MHT tube heater include at
a minimum the following:
• Tape measure
• Electric drill (with an assortment of drill bits)
• Pipe wrenches – 2 required
• Screwdriver
• Tin snips
• Hacksaw
• Wire strippers
• Staple gun
• Level
• Pliers
Choose Location for Heater
When selecting a suitable mounting location for the MHT tube
heater it is important to consider the following:
1. The heater must meet the minimum mounting height
requirement of 7 feet above the oor. For aircraft hangars and
public garages, the heater must meet the minimum mounting
height requirement of 8 feet above the oor.
2. The proposed mounting location allows for the minimum
required safe distances from combustibles (combustibles include
vehicles, wood gasoline and ammable objects, liquids and
vapors)
3. The proposed mounting location of the heater will not restrict
motion of passageway doors or windows.
4. The proposed location will not interfere with operation of the
overhead garage door.
5. The proposed location will provide the best coverage of the
total area to be heated.
6. The proposed location must provide for adequate combustion
and ventilation air.
7. The proposed location must provide for adequate accessibility
clearance for service and proper operation.
8. Consideration be given to the types of vehicles that will be
parked in the garage (cars, vans, boats, RV’s etc.).
9. The proposed location will allow for the minimum required safe
distances from combustibles with respect to the vehicles parked
in the garage.
10. The proposed location will allow the required utilities (i.e.: gas
and electric) and venting to be installed (maximum vent length
is 25 feet).
11. Sufcient clearances will exist to allow for maintenance.
12. Overhead structural members (rafters, beams, etc.) are
accessible for attaching the heater.
13. Location must allow for adequate clearance around air openings
into the combustion chamber.
Mr. Heater | Gas-Fired Low-Intensity Infrared Heater Operating Instructions and Owner’s Manual
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