Modine Manufacturing HD Installation And Service Manual - page 3
3
INSTALLATION
In the U.S., the installation of these units must comply with the
“National Fuel Gas Code,” ANSI Z223.1, latest edition (also
known as NFPA 54) and other applicable local building codes.
In Canada, the installation of these units must comply with local
plumbing or waste water codes and other applicable codes and
with the current code CAN/CGA-B149.1, “Installation Code for
Natural Gas Burning Appliances and Equipment” or CAN/CGA-
B149.2, “Installation Code for Propane Burning Appliances and
Equipment.”
1. All installation and service of these units must be performed
by a qualified installation and service agency only as defined
in ANSI Z223.1, latest edition or in Canada by a licensed
gas fitter.
2. This unit is certified with the controls furnished. For
replacement parts, please order according to the
replacement parts list on serial plate. Always know your
model and serial numbers. Modine reserves the right to
substitute other authorized controls as replacements.
3. Unit is balanced for correct performance. Do not alter fan or
operate motors at reduced speed.
4. Information on controls is supplied separately.
5. Modine unit heaters use the same burner for natural and
propane gases.
Locating Unit Heaters
In locating units, consider general space-heating requirements.
Do not install a unit in a confined space without providing wall
openings leading to and from the space. Mounting height
(measured from bottom of unit) at which unit heaters are
installed is critical. Please refer to mounting height information
and heat throw data on page 14 of this manual. The maximum
mounting height for any unit is that height above which the unit
will not deliver heated air to the floor.
Adequate Combustion Air
This gas-fired unit heater must be supplied with adequate
combustion air. Today’s current construction techniques, which
result in tighter homes and buildings (or significantly less air
infiltration from the outside), makes it more important than ever
that heating equipment have adequate combustion air.
Although the requirements for combustion and ventilation air
depend on whether or not the unit is installed in a confined or
unconfined space, under all conditions, enough air must be
provided to ensure there will not be a negative pressure in either
a confined or unconfined space. Adequate combustion air (or
infiltration), coming from the outdoors will eliminate negative
pressure.
Confined or Unconfined Spaces
The National Fuel Gas Code defines an “unconfined space” as
a space whose volume is greater than 50 cubic feet per 1000
Btu/Hr input of the installed appliance(s). A confined space is 50
cubic feet or less per 1000 Btu/Hr input of the installed
appliance(s).
Modine does not recommend installing these unit heaters into
residential confined spaces. This recommendation is due to the
concern that at some point in time, the combustion air openings
provided by the installer may become blocked or eliminated by
the owner, either intentionally or unintentionally. Despite this
recommendation, if these units are installed into a residential
confined space, see the National Fuel Gas Code ANSI Z223.1
or CAN/CGA B149.1 or .2 Installation Code, latest edition, for
detailed combustion air provisions. These requirements must
be adhered to.
Units installed into confined spaces in industrial/commercial
installations, must be provided with two permanent openings,
one near the top of the confined space and one near the bottom
of the confined space. Each opening should have a free area of
not less than one square inch per 1,000 BTU per hour of the
total input rating of all units in the confined space, freely
communicating with interior areas having, in turn, adequate
infiltration from the outside.
For further details on supplying combustion air to a confined
(tightly sealed) space or unconfined space, see the National
Fuel Gas Code ANSI Z223.1 or CAN/CGA B149.1 or .2
Installation Code, latest edition.
CAUTION
Do not locate units in tightly sealed rooms or small
compartments (commonly referred to as confined spaces)
without provisions for adequate combustion air and venting.
Combustion air must have access to the confined space
through a minimum of two permanent openings in the
enclosure, at least one near the bottom. They should provide
a free area of one square inch per 1000 BTU/Hr input rating of
the unit with a minimum of 100 square inches for each
opening, whichever is greater.
Turn off all gas before installing unit heaters.
Modine unit heaters are designed for use in heating applications
with ambient temperatures between -40° F and 90° F.
Do not install unit outdoors.
!
CAUTION
Do not install in potentially explosive or flammable
atmospheres laden with grain dust, sawdust, or similar air-
borne materials. In such applications a blower type heater
installed in a separate room with ducting, including
appropriate back flow prevention dampers to the dust laden
room is recommended.
To prevent premature heat exchanger failure, do not locate
ANY gas-fired unit heaters in areas where chlorinated,
halogenated or acid vapors are present in the atmosphere.
Installation of units in high humidity or salt water atmospheres
will cause accelerated corrosion resulting in a reduction of the
normal life of the units.
!
CAUTION
All literature shipped with this unit should be kept for future
use for servicing or service diagnosis. Do not discard any
literature shipped with this unit.
Consult piping, electrical, and venting instructions in this
manual before final installation.
Do not attach ductwork, air filters, or polytubes to any HD unit
heaters.
!
CAUTION
In commercial garages or other sections of aircraft hangars
such as offices and shops which communicate with areas
used for servicing or storage, keep the bottom of the unit at
least 7' above the floor. In public garages, the unit must be
installed in accordance with the Standard for Parking
Structures NFPA 88A and the Standard for Repair Garages
NFPA 88B. In Canada, installation of unit heater in airplane
hangars must be in accordance with the requirements of the
enforcing authority, and in public garages in accordance with
the current CAN/CGA-B149 codes.
In aircraft hangars, keep the bottom of the unit at least 10'
from the highest surface of the wings or engine enclosure of
the highest aircraft housed in the hangars and in accordance
with the requirements of the enforcing authority and/or NFPA
409 - latest edition.
!