Caution, Installation – Modine Manufacturing 6-558.6 User Manual
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INSTALLATION
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Product Description
Modine PSH and BSH model unit heaters are listed as separated
combustion unit heaters and are defined as follows: A unit heater
for installation in non-residential structures which, when connected
to a sealed combustion air pipe and sealed exhaust vent, supplied
by the installer, constructed so that when installed according to the
manufacturer’s instructions, air for combustion is derived from the
outside atmosphere and the flue gases from the appliance are
discharged to the outside atmosphere and the flue gases from the
appliance are discharged to the outside atmosphere.
In the U.S., the installation of these units must comply with the
“National Fuel Gas Code,” ANSIZ223.1, 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
ANSIZ223.1, 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, control code
and serial number 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.
Locating 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 sir stream from another,
setting up circulatory air movement in the area. In buildings
exposed to prevailing winds, a large portion of the heated air
should be directed along with 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 for
standard units are listed in Tables 7 and 8 on page 18. Alternate
mounting heights for units with deflector hoods or nozzles are
shown on pages 10 and 12. The maximum mounting heights for
any unit is that heights 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.
Motors and controls used on Modine unit heaters are designed for
use in 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.
Combustion Air Requirements
Modine models PSH and BSH separated combustion units are
designed to receive air for combustion directly from the outside
atmosphere via field installed combustion air piping between the
unit and the outside atmosphere. The combustion air inlet of the
unit must be connected to the outside atmosphere.
The maximum equivalent length of combustion air piping cannot
exceed 30 feet. Keep this limitation in mind when locating units.
See page 5 for combustion air piping instructions.
Unit Suspension
Be sure the means of suspension is adequate to support the
weight of the unit. (See page 19 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.
On all propeller units except the PSH280 and PSH340, two tapped
holes (3/8 - 16) are located in the top of the unit to receive ceiling
hangers. Units with two point suspension, models PSH130 through
PSH225, 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.
PSH130 through PSH225 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 (Figure 3). 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.
The PSH280 and PSH340 have four mounting holes. On all blower
units, except the BSH280 and BSH340, two tapped holes are
provided in the top of the unit and two holes in the blower support
bracket. The BSH280 and BSH340 have four tapped holes in the
top of the unit and two in the blower support bracket for mounting.
To assure that flames are directed into the center of heat
exchanger tubes, unit must be supported in a vertical position, with
suspension hangers “UP.” Check with a level. This is important to
the operation and life of unit.
NOTE: Pipe hanger adapter kits, as shown in Figure 3, are
available as accessories from Modine. The hardware allows for
pipe caps to be secured into the top of the unit heater with
machine screws (as illustrated - machine screws are 3/8 - 16 x
1.75 UNC-2A THD). The pipe caps can then accommodate 3/4"
NPT pipe for mounting. Three different kits are available with either
2, 4, or 6 adapters per kit. See price sheet to determine proper kit.
CAUTION
Minimum clearance to combustibles is 12 inches from the
bottom; 18 inches from the sides; 6 inches from the top and vent
connector.
Allow at least 12" at the rear of unit or 6" beyond the end of the
motor (Whichever is greater) to provide ample air for proper
operation of fan.
Provide clearance for opening hinged bottom of servicing. See
Figure 2.
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.