Enerco MHU 45 User Manual
5
Operating Instructions and Owner’s Manual
Enerco | Compact Unit Heater
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 CSA B149.1, Natural Gas and Propane Installation Code current
edition.
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 CSA B149.1, Natural Gas and Propane Installation Code current
edition.
In a confined area, the heater must be installed in accordance with the
CSA B149.1, Natural Gas and Propane Installation Code. Be sure to check
with local codes and ordinances for additional requirements.
CSA B149.1, Natural Gas and Propane Installation Code. Be sure to check
with local codes and ordinances for additional requirements.
UNIT HEATER INSTALLATION
Unit is shipped ready for installation. Unit may be installed
as shown in
figure 1 or inverted 180
o
depending on desired location
as governed by clearances, vent connection, air direction, gas
supply, electrical supply and service accessibility.
1.
If installing unit in an inverted position: Remove and retain screws
securing door and rotate door 180
o
. Secure with retained screws.
Rotate louvers directing airflow as desired.
2.
Choose location for mounting brackets.
3.
Remove and retain three screws along top edge (bottom edge
when inverted) of front of unit.
4.
Align screw holes on mounting bracket with holes along top edge
(either upright or inverted) of unit. Secure one mounting bracket
to front of unit with retained screws. Secure other mounting
bracket to back of unit with screws provided in bag assembly
containing flue transition.
to front of unit with retained screws. Secure other mounting
bracket to back of unit with screws provided in bag assembly
containing flue transition.
5.
To support unit, secure mounting bracket to ceiling joist or truss.
Unit may also hang on rods as shown in figure 1 .
Natural Gas and Propane Installation Code in Canada,
or applicable provisions of local building codes.
All gas fired appliances require air to be used for the combustion
process. In many buildings today, there is a negative indoor air
pressure caused by exhaust fans, etc. If sufficient quantities of
combustion air are not available, the heater or another
appliance will operate in an inefficient manner, resulting in
incomplete combustion which can result in the production of
excessive carbon monoxide.
process. In many buildings today, there is a negative indoor air
pressure caused by exhaust fans, etc. If sufficient quantities of
combustion air are not available, the heater or another
appliance will operate in an inefficient manner, resulting in
incomplete combustion which can result in the production of
excessive carbon monoxide.
CAUTION Insufficient combustion air can cause headaches,
nausea, dizziness, asphyxiation or death.
nausea, dizziness, asphyxiation or death.
If 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 affected: chlorine, carbon tetrachloride, cleaning solvent,
halogen refrigerants, acids, cements and glues, printing inks,
fluorides, paint removers, varnishes, or any other corrosives.
following substances or the life of the heat exchanger will be
adversely affected: chlorine, carbon tetrachloride, cleaning solvent,
halogen refrigerants, acids, cements and glues, printing inks,
fluorides, paint removers, varnishes, or any other corrosives.
VENTING
A – GENERAL RECOMMENDATIONS AND
REQUIREMENTS
REQUIREMENTS
NOTE: The vent is a passageway, vertical or nearly so, used to
convey flue gases from an appliance, or its vent connector, to the
outside atmosphere. The vent connector is the pipe or duct that
connects a fuel-gas burning appliance to a vent or chimney.
convey flue gases from an appliance, or its vent connector, to the
outside atmosphere. The vent connector is the pipe or duct that
connects a fuel-gas burning appliance to a vent or chimney.
Unit heaters must be vented in compliance with all local codes or
requirements of the local utility, the current standards of the
(American) National Fuel Gas Code, ANSI Z223.1 or (Canada) CSA
B149.1 Natural Gas and Propane Installation Code, and the
following instructions.
requirements of the local utility, the current standards of the
(American) National Fuel Gas Code, ANSI Z223.1 or (Canada) CSA
B149.1 Natural Gas and Propane Installation Code, and the
following instructions.
A metal stamped/extruded transition is supplied with this certified
unit. It must not be modified or altered and must be installed on
the outlet of the induced draft blower assembly prior to the
installation of the vent or vent connector. Failure to comply with
this requirement will void the certification of the unit by the
approval agencies. All joints shall be secured with at least two
corrosion resistant screws. All joints must be checked for gas
tightness after installation.
unit. It must not be modified or altered and must be installed on
the outlet of the induced draft blower assembly prior to the
installation of the vent or vent connector. Failure to comply with
this requirement will void the certification of the unit by the
approval agencies. All joints shall be secured with at least two
corrosion resistant screws. All joints must be checked for gas
tightness after installation.
TABLE 2
MAXIMUM VENT LENGTHS
HORIZONTAL VENTS
INSTALL UNIT HEATER
SUPPORT
RODS
MOUNTING
BRACKETS (2)
FIGURE 1
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).
The installation shall conform with local building codes or, in the absence
of local codes, with the
of local codes, with the
National Fuel Gas Code, ANSI Z223.1 /
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.
by a qualified service agency.
Adequate facilities for supplying air for combustion and
ventilation must be provided in accordance with the latest edition
of section 5.3, Air for Combustion and Ventilation, of the
National Fuel Gas Code, ANSI Z223.1, in the U.S.A., CSA B149.1
ventilation must be provided in accordance with the latest edition
of section 5.3, Air for Combustion and Ventilation, of the
National Fuel Gas Code, ANSI Z223.1, in the U.S.A., CSA B149.1
COMBUSTION AND VENTILATION AIR