Instructions / Assembly

INSTALLATION – UNIT LOCATION
1-500 3
DANGER
Units must not be installed where they may be exposed to
potentially explosive or flammable atmosphere.
CAUTION
1. All literature shipped with this unit should be kept for
future use for servicing or service diagnostics. Leave
manual with the owner. Do not discard any literature
shipped with this unit.
2. Consult piping and electrical instructions in this manual
before final installation.
3. Units are designed for use in heating applications with
ambient temperatures between 40°F and 100°F.
Heaters should not be used in applications where the
heated space temperature is below 40°F unless a glycol
anti-freeze solution has been added.
4. Units not approved for use in potable water systems.
IMPORTANT
1. Start-up and adjustment procedures should be
performed by a qualified service agency.
2. Be sure no obstructions block air intake and discharge
of unit heaters. Do not attach ductwork or air filters to
this unit heater. Maintain a minimum of 6” clearance to
inlet openings.
1. Units should not be installed in atmospheres where
corrosive fumes or sprays are present.
2. When locating the heater, consider general space and
heating requirements and availability of hot water and
electrical supply.
3. Be sure the structural support at the unit location site is
adequate to support the unit’s weight.
4. Determine mounting orientation of the unit heater.
Figure 3.1 shows three typical orientations. Additional
details can be seen in Figure 5.2.
5. Be sure no obstructions block air intake and discharge
of unit heaters. Do not attach ductwork or air filters to
this unit heater. Maintain a minimum of 6” clearance to
inlet openings. Failure to do so will result in poor unit
performance.
6. Unit heaters installed in a building exposed to a
prevailing wind should be located to direct a major
volume of heated air along the windward wall.
7. Vertical delivery unit heaters should generally be
located in the central area of the space to be heated.
Place horizontal delivery units along the walls of the
same building where heat loss is usually greatest.
8. Locate units so they do not blow directly at occupants.
9. Locate units so their air streams blanket exposed walls.
Reversing Electrical/Piping Connection Access
Units feature electrical access on the left and piping
connections on the right as standard (when looking at the
unit). If the installation requires the access to be reversed,
the unit can be flipped 180° from the way it was received
from the factory. By doing so, the sides become opposite
but the front and back remain in the same relative position.
The bottom panel now becomes the top panel and vice-
versa. Be sure to remove the spring loaded deflector
blades, turn them over, replace, and adjust so they are open
and in a position to direct the heated air down to the floor.
Note that the labels on the front of the unit will be upside
down. New stickers can be purchased from Modine.
Figure 3.1 – Model HHD Mounting Orientations
Horizontal Air Delivery,
Perpendicular to Joists
Horizontal Air Delivery,
Parallel to Joists
Vertical Air Delivery,
Recessed Between Joists