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UNIT WITH DRAFT STOP
6. It is recommended that the unit be installed against a wall
made of non-combustible material and on a floor made of
non-combustible material.
7. If the mounting surfaces are to be of combustible material,
they must be covered with sheet steel. The sheet steel must
extend at least 4 feet on either side of the DraftStop open-
ing in the back of the unit and cover completely the ex-
posed wall and floor.
SETTING THE UNIT
1. Be sure that the unit condensate drain hand of connection
agrees with the drain stub-up. Move condensate drain plug
to opposite end if necessary.
2. Move unit into position against the wall.
3. Check to see that unit is level: front to back and end to end.
4. Attach unit to wall through the four (4) mounting holes pro-
vided. (See Figure 3.) AAF-HermanNelson does not pro-
vide fasteners. Use fasteners that are suited to the wall
construction. Extra length fasteners are required on units
with adaptor back.
5. Unit must be pulled tight to the wall so that the outdoor
air seals are compressed.
PIPING CONNECTIONS
The system water piping must be thoroughly cleaned and
flushed before making the piping connections to the unit.
Refer to page 3 for water system cleaning.
1. The water piping to each unit must include a tight shutoff
valve in both the supply and return line. A balancing valve
must also be installed so that the water flow to the unit can
be adjusted to the specified GPM.
2. Always use union type connections. This will permit the
piping to be easily disconnected if it becomes necessary
to pull the unit from the wall.
3. Units can be hard piped or the optional flexible hose kit
can be used. Refer to Figure 5 for guidelines when using
the optional hose kit.
4. Connect the unit condensate drain to the building drain
system. A trap in the drain line may be necessary to meet
local code requirements, but a trap is not required for con-
densate to flow freely away from the unit.
ELECTRICAL CONNECTIONS
1. All field wiring should be in accordance with the National
Electric Code and applicable local codes.
2. Refer to the wiring diagram furnished with the unit to de-
termine electrical connections required.
3. Check unit nameplate to verify that power supply is correct.
OILING
1. Do not attempt to operate the unit fans until the fan shaft
bearing has been oiled. (See Figure 3.)
2. Use a high grade SAE 20 or 30 non-detergent oil. A few
drops is sufficient. Do not over-oil. Refer to Figure 3 for oil
point. The fan motor does not require oiling until after one
(1) year of operation.
END PANELS
Install end panels (refer to Figure 4). Attach two (2) Tinnerman
nuts to the top edge of the end panel and two (2) to the bot-
tom end of the unit. Align the end panel with the front and top
edges of the unit. Attach end panel to unit using four (4)
5
⁄
32
"
hex socket head fasteners provided.
SYSTEM BALANCING
1. Do not attempt to operate the unit until it has been deter-
mined the proper volume of water is flowing through the
unit water coil.
2. Refer to page 4 for recommended water balancing proce-
dure.
Figure 3.
Figure 4.
FAN SHAFT
BEARING (OIL)
MOUNTING
HOLES
(2) EACH END
