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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 by C.S.A., with the controls furnished.For
replacement parts, submit the complete model and serial
numbers shown on rating plate on the unit.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.
L
ocating Unit Heaters
In locating units, consider general space-heating requirements,
availability of gas, and proximity to vent locations.Unit heaters
should be located so heated air streams wipe exposed walls
without blowing directly against them.In multiple unit installations,
arrange units so that each supports the air stream from another,
setting up circulatory air movement in the area, but maintain
separation between units so discharge from one unit will not be
directed into the inlet of another.In buildings exposed to prevailing
winds, a large portion of the heated air should be directed along the
windward wall.Avoid interference of air streams as much as
possible.
Mounting height (measured from bottom of unit) at which unit
heaters are installed is critical.Maximum mounting heights are
listed in Table 7 on page 18.Alternate mounting heights for units
with deflector hoods or nozzles are shown on pages 14,16 and 17.
The maximum mounting height for any unit is that height above
which the unit will not deliver heated air to the floor.The maximum
mounting heights must not be exceeded in order to assure
maximum comfort.
Modine unit heaters are designed for use in heating applications
with ambient temperatures between 32° F and 90° F.If an
application exists where ambient temperatures can be expected to
fall outside of this range, contact factory for recommendations.
C
ombustion Air Requirements
Units installed in tightly sealed buildings or confined spaces should
be provided with two permanent openings, one near the top of the
enclosure and one near the bottom. 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 enclosure, freely
communicating with interior areas having, in turn, adequate
infiltration from the outside.
U
nit Suspension
The most common method of hanging Modine gas unit heaters is
to utilize 3/8" threaded rod. On each piece of threaded rod used,
screw a nut a distance of about one inch onto the end of the
threaded rods that will be screwed into the unit heater. Then put a
washer over the end of the threaded rod and screw the threaded
rod into the unit heater weld nuts on the top of the heater at least 5
turns, and no more than 10 turns. Tighten the nut you first installed
onto the threaded rod to prevent it from turning. Drill holes into a
steel channel or angle iron at the same centerline dimensions as
the heater that is being installed. The steel channels or angle iron
pieces need to span and be fastened to appropriate structural
members. Cut the threaded rods to the preferred length, push
them through the holes in the steel channel or angle iron and
secure with washers and lock nuts or lock washers and nuts. A
double nut arrangement can be used here instead of at the unit
heater (a double nut can be used both places but is not necessary).
The entire means of suspension must of course be adequate to
support the weight of the unit (see page 14 and 15 for unit weights).
For proper operation, the unit must be installed in a level horizontal
position.Clearances to combustibles as specified above must be
strictly maintained.Do not install standard unit heaters above the
maximum mounting height shown in Table 7 on page 13, or below
seven feet from the bottom of the unit to the floor.
On all propeller units, except the PD 350 and PD 400, two tapped
holes (3/8-16) are located in the top of the unit to receive threaded
rods.
Units with two point suspension, models PD30 through PD300,
incorporate a level hanging feature.Depending on what options and
accessories are being used, the heater may not hang level as
received from the factory.Do not hang heaters with deflector hoods
until referring to the “installation manual for deflector hoods” and
making the recommended preliminary adjustments on the heater.
These preliminary adjustments need to be made with the heater
resting on the floor.
PD30 through PD300 units without deflector hoods that do not
hang level after being installed, can be corrected in place.Simply
remove both outer side panels (screws to remove are on back
flange of side panel) and you will see the (adjustable) mounting
brackets (Fig.2).Loosen the set screws holding the mounting
brackets in place and using a rubber mallet or something similar,
tap the heater into a position where it does hang level.Re-tighten
set screws and replace the outer side panels.
CAUTION
For all sizes, minimum clearance to combustibles from the
bottom is 12" and from the sides 18"; for PD sizes 30-50 from
the top is 1" and from the flue collar 2"; for PD sizes 75-300
from the top is 2" and from the flue collar is 3"; for PD 350
from the top is 3" and from the flue collar is 4"; for PD 400
from the top is 4" and from the flue collar is 5"; and for all BD
sizes from the top and flue collar is 6".
Allow at least 12" at the rear or 6" beyond the end of the
motor (whichever is greater), to provide ample air for
combustion and for proper operation of fan. Provide clearance
for opening at the hinged bottom for servicing - See Figure 1.
3
INSTALLATION
CAUTION
Units must not be installed in potentially explosive,
flammable, or corrosive atmosphere.
To prevent premature heat exchanger failure do not locate
ANY gas-fired unit in areas where chlorinated, halogenated
or acid vapors are present in the atmosphere.
Heater Parts from ACF Greenhouses