Enerco MHU 75, MHU 45 User Manual

OPERATING INSTRUCTIONS AND OWNER’S MANUAL

MR. HEATER

LEDO

MHU 45 MHU

COMPACT UNIT HEATER

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.

LEDO

ATSTAR

HSU 45

HSU

WARNING:

injury or property damage. Refer to this manual. For assistance or additional

cause in

formation 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.

Improper installation, adjustment, alteration, service or maintenance can

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.

03/05 Revision L1 #60016ENERCO GROUP, 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.

CONTENTS

UNIT DIMENSIONS ................................................................. 3

SHIPPING ................................................................................ 4

REQUIREMENTS ...................................................................... 4

UNIT HEATER INSTALLATION .................................................. 5

COMBUSTION & VENTILATION AIR ........................................ 5

VENTING ................................................................................. 5

ELECTRICAL CONNECTIONS .................................................... 8

GAS CONNECTION ................................................................. 8

LEAK CHECK ........................................................................... 9

START-UP OPERATION ............................................................. 9

HEATING SEQUENCE OF OPERATION..................................... 10

IGNITION CONTROL LED........................................................ 11

ADJUSTMENTS....................................................................... 11

SERVICE ................................................................................. 12

WIRING DIAGRAM................................................................. 13

PARTS LIST ............................................................................. 14

WARRANTY ........................................................................... 16

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:

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 REPRODUCTIVE HARM).

Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual

AIR

FLOW

HEAT EXCHANGER

(ALUMINIZED STEEL)

MHU45/MHU75 AND HSU45/HSU75 UNIT DIMENSIONS

(N-NATURAL GAS, P-PROPANE)

HANGING

BRACKETS

MOUNTING SLOTS (Typical) 5/16 x 3 Inches (8 x 76 mm)

DIMENSION 45 75

A 12 (305) 17 (432)

B 5-1/2 (140) 6-1/2 (165)

C 4-1/4 (108) 6-3/4 (171)

TOP VIEW

ELECTRIC AL

INLETS

DIRECT

DRIVE FAN

FLUE

OUTLET

GAS

INLET

BACK VIEW

START–UP AND PERFORMANCE CHECK LIST

Job Name: _________________________________________

Job Location: _______________________________________

Installer: __________________________________________

Unit Model No.: ____________________________________

Electrical Connections Tight? ______________________________________________

Supply Voltage __________________________________________________________

Gas Piping Connections Tight & Leak-Tested? _________________________________

Motor Amps ____________________________________________________________

Furnace Btu Input ________________________________________________________

Line Pressure ____________________________________________________________

Manifold Pressure w.c. ____________________________________________________

Job No.: ______________________________________

City: _________________________________________

Serial No.: ____________________________________

HANGING

BRACKETS (2)

ADJUSTABLE

SERVICE

ACCESS PANEL

LOUVERS

SIDE VIEW

Date: ______________________________________

State/Province: ______________________________

Service Technician: ___________________________

Flue Connections Tight? _________________________________________________

Fan Timer Operation Checked? ____________________________________________

THERMOSTAT

Calibrated? ____________________________________________________________

Heat Anticipator Properly Set?

Level? _________________________________________________________________

Operating Instructions and Owner’s ManualEnerco | Compact Unit Heater

SHIPPING

The heater is completely assembled. Installation instructions, two mounting brackets (shipped loose), and a flue transition are included. Check the unit for shipping damage. The receiving party should contact the last carrier immediately if any shipping damage is found.

REQUIREMENTS – CSA IN THE USA

Installation of gas unit heaters must conform with local building codes or, in the absence of local codes, with the current National Fuel Gas Code ANSI Z223.1.

Installation in aircraft hangers must be in accordance with the current Standard for Aircraft Hangers ANSI/NFPA No. 409.

Installation in parking structures must be in accordance with the current Standard for Parking Structures ANSI/NFPA No. 88A.

Installation in repair garages must be in accordance with the current Standard for Repair Garages ANSI/NFPA No. 88B.

These units are approved for residential applications. For installation in a residential garage these units must be installed so that burners and ignition source are located no less than 18" (457mm) above floor. Heater must be located or protected to avoid physical damage by vehicles. Refer to the National Fuel Gas Code, ANSI Z223.1, current edition.

Authorities having jurisdiction should be consulted before NFPA installation. Air for combustion and ventilation must conform to the methods outlined in ANSI Z223.1, section 5.3, Air for Combustion and Ventilation, or applicable provisions of local building codes. The National Fuel Gas Code is available from:

American National Standard Institute Inc. 11 West 42nd Street New York, NY 10036

These units are CSA International design certified. These unit heaters are certified for installation to combustible material as listed in table 1 and on unit rating plate. Accessibility and service clearances must be observed in addition to fire protection clearances.

All electrical wiring and ground for unit must be in accordance with the regulations of the current National Electric Code ANSI/ No. 70.

The National Electric Code is available from:

National Fire Protection Association 1 Batterymarch Park PO Box 9101 Quincy, MA 02269-9101

TABLE 1

UNIT CLEARANCES

Top Sides Access Panel

in mm in mm in mm

1 25 1 25 18 457

Bottom Rear Single Wall Vent*

in mm in mm in mm

00 184566152

*Except for listed clearance thimbles.

REQUIREMENTS – CSA IN CANADA

The instructions are intended only as a general guide and do not supersede local codes in any way. Authorities having jurisdiction should be consulted before installation. The installation must conform with local building codes or in the absence of local codes, with the current CSA B149.1, Natural Gas and Propane Installation Code. All electrical wiring and grounding for the unit must also comply with the Canadian Electrical Code CSA C22.1, current edition.

These unit heaters are CSA International. certified for the clearances to combustible material listed on the rating plate and table 1. Adequate clearance around air openings into the combustion chamber, clearances from combustible material, and provisions for accessibility and for combustion and ventilation air supply. Provision shall be made for service accessibility to the heater. Note that fire protection clearances may be exceeded to provide additional space for service and accessibility.

GARAGE INSTALLATIONS:

Installation in parking structures must be in accordance with the current Standard for Parking Structures ANSI/NFPA No. 88A.

Installation in repair garages must be in accordance with the current Standard for Repair Garages ANSI/NFPA No. 88B.

1. In a storage area, clearance from heaters to combustible materials must be such that the material shall not attain a temperature above 160°F by continuous operation of the unit.

2. Eight foot minimum clearance from the floor to the bottom of the heater must be maintained. Refer to the CSA B149.1, Natural Gas and Propane Installation Code

AIRCRAFT HANGER:

Installation of gas unit heaters must conform with local building codes or, in the absence of local codes, with the current National Fuel Gas Code ANSI Z223.1.

1. In an area where aircraft are housed or serviced, 10' minimum clearance from highest surface of aircraft to bottom of the heater must be maintained.

2. In other areas, 8' minimum clearance from the floor to bottom of heater must be maintained.

3. Heaters should be located so as to be protected from damage from aircraft or other appliances needed for servicing of aircraft. Refer to requirements of the enforcing authorities.

Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual

These units are approved for residential applications. For installation in a residential garage, these units must be installed so that burners and

source are located no less than 18” (457mm) above floor. Heater

ignition must

be located or protected to avoid physical damage by vehicles.

Refer to CSA B149.1, Natural Gas and Propane Installation Code current

edition

a confined area, the heater must be installed in accordance with the

In CSA B149.1, Natural Gas and Propane Installation Code. Be sure to check with

local codes and ordinances for additional requirements.

UNIT HEATER INSTALLATION

The installation shall conform with local building codes or, in the absence of local codes, with the

NFPA 54 or the CSA B 149.1, Natural Gas and Propane Installation Code.

The appliance and venting system is to be inspected once a year by a qualified service agency.

Unit is shipped ready for installation. Unit may be installed as sh

governed by clearances, vent connection, air direction, gas

as suppl

1. If installing unit in an inverted position: Remove and retain screws

2. Choose location for mounting brackets.

3. Remove and retain three screws along top edge (bottom edge

4. Align screw holes on mounting bracket with holes along top edge

5. To support unit, secure mounting bracket to ceiling joist or truss.

figure

own in

y, electrical supply and service accessibility.

securing Rotate louvers directing airflow as desired.

when

(either to bracket

containing flue transition.

Unit

door and rotate door 180o. Secure with retained screws.

inverted) of front of unit.

upright or inverted) of unit. Secure one mounting bracket

front of unit with retained screws. Secure other mounting

to back of unit with screws provided in bag assembly

may also hang on rods as shown in

National Fuel Gas Code, ANSI Z223.1 /

or inverted 180

depending on desired location

figure

COMBUSTION AND VENTILATION AIR

Adequate facilities for supplying air for combustion and ventilation must

section 5.3, Air for Combustion and Ventilation, of the

of National Fuel Gas Code, ANSI Z223.1, in the U.S.A., CSA B149.1

Natural Gas and Propane Installation Code in Canada, or

applicable provisions of local building codes.

gas fired appliances require air to be used for the combustion

All process. In many buildings today, there is a negative indoor air pressure caused by exhaust fans, etc. If sufficient quantities of combustion appliance incomplete excessive carbon monoxide.

CAUTION Insufficient combustion air can cause headaches, nausea,

dizziness, asphyxiation or death.

indoor air is to be used for combustion, it must be free of the following substances or the life of the heat exchanger will be adversely halogen fluorides,

refrigerants, acids, cements and glues, printing inks,

be provided in accordance with the latest edition

air are not available, the heater or another

will operate in an inefficient manner, resulting in

combustion which can result in the production of

affected: chlorine, carbon tetrachloride, cleaning solvent,

paint removers, varnishes, or any other corrosives.

VENTING

A – GENERAL RECOMMENDATIONS AND REQUIREMENT

NOTE: The vent is a passageway, vertical or nearly so, used to

nvey flue gases from an appliance, or its vent connector, to the

co outside

atmosphere. The vent connector is the pipe or duct that

connects

Unit requirements of the local utility, the current standards of the (American)

B149.1 Natural Gas and Propane Installation Code, and the following

a fuel-gas burning appliance to a vent or chimney.

heaters must be vented in compliance with all local codes or

National Fuel Gas Code, ANSI Z223.1 or (Canada) CSA

instructions.

MOUNTIN

BRACKETS

INSTALL UNIT HEATER

(2)

FIGURE 1

SUPPORT

RODS

A metal stamped/extruded transition is supplied with this certified

It must not be modified or altered and must be installed on

unit.

outlet of the induced draft blower assembly prior to the

the

ation of the vent or vent connector. Failure to comply with

install

requirement will void the certification of the unit by the

this approval corrosion tightness

agencies. All joints shall be secured with at least two

resistant screws. All joints must be checked for gas

after installation.

TABLE 2

MAXIMUM VENT LENGTHS

HORIZONTAL VENTS

No. of ft m

Elbows

1 25 7.6

2 20 6.1

3 15 4.6

4 10 3.0

5 5 1.5

Maximum length of vent connector not to exceed 30 ft. (9.1m).

Operating Instructions and Owner’s ManualEnerco | Compact Unit Heater

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