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Page 7 

To mount the cone guard, place eight 1/4” X 1-1/4” bolts in the eight remaining holes in the end of the cone 

from the 

outside in

, and fasten them with 1/4” whiz-lock nuts.  These will serve as the Guard Studs.  See Figures 12 & 13.  

After the Guard Studs have been fastened, mount the Cone Guard by placing the Guard eyelets over the Guard 
Studs and fastening each with another 1/4” whiz-lock nut.  While installing the cone guard, take the spring at the end 

of the door restraining cable, and attach it to vertical guard rib 
below the 3rd ring (from the center) of the guard.  See Figure 
14. 

Next, mount the spring bracket at the center of the door ring 
assembly where the struts intersect.  Use two cable ties to 
secure the spring bracket as shown in Figure 15.  Attach one 
end of each spring to the spring bracket.  The other end of each 
spring should be attached to the inside door hole in the damper 
door. 

To check for proper damper operation, open the doors fully, 
and allow them to close. If either door fails to close properly, 
rotate the assembly slightly on the fan orifice until both doors 
will close properly.  With the cone secured in place, remove the 
Handles for use on the next fan. 

GUARD MOUNTING 

Once the unit is assembled, the inlet guard 
must be in place before operation.  To mount 
the  guard, center it over the fan housing.  
Then, slip the guard over the two guard clips 
on the top housing flange.  To secure the 
guard, close the 6 guard latches over the 
guard wire.  The installation of the unit is now 
complete.  See Figure 16 for details. 

Figure 17 —  Assembled Unit 

Figure 16 

Guard Clip 

Guard Latch 

Figure 15 — Spring & Bracket Assembly 

Spring 

Bracket 

Cable 

Ties 

Figure 13 — Guard Stud Detail 

Large Diameter 

Cone Edge 

Guard Studs 

Guard 
Stud 
Bolt  

Cone 
Panel  

Guard 
Eyelet 

Whiz-Lock 

Nuts 

Figure 12 

Figure 14 —  Door Cable 

Summary of Contents for MNBCDD54

Page 1: ...s coolair com MNEFDD54L MNEFDD54M MNBCDD54L MNBCDD54M UNPACKING Inspect the fan for signs of shipping damage It is the responsibility of the customer to report any shipping damage to the freight carri...

Page 2: ...FRAMING Page 2 FRAME CONSTRUCTION RECOMMENDED MINIMUM SPACING IS 16 Figure 2 58 3 4 SQ I D Spacing POST CONSTRUCTION Figure 3 4 x 4 Post 58 3 4 SQ I D...

Page 3: ...two 1 4 whiz lock nuts fasten the two sheets at the overlapping holes on the inside corner of the two sheets Push the bolts from the outside in and thread the nuts on the inside This process should b...

Page 4: ...pulley and the fan hub pulley If necessary loosen the motor pulley set screw and or the motor mounting bolts and adjust as necessary Re tighten pulley set screw and motor mounting bolts IMPORTANT Mot...

Page 5: ...by finding the bottom cone quarter panel and one of the other panels side panel Place these two panels such that the edge of the side panel overlaps the bottom panel and the holes on the overlapping e...

Page 6: ...rocess on the opposite side for the other handle Figure 11 shows the handle placement To mount the cone assembly pick the assembly up by the handles and place the top of the smaller end over the fan p...

Page 7: ...et The other end of each spring should be attached to the inside door hole in the damper door To check for proper damper operation open the doors fully and allow them to close If either door fails to...

Page 8: ...side of the fan orifice it will be necessary to loosen the two 2 3 8 bolts that secure the blade assembly s hexagonal shaft to the fan x braces center the blade assembly and tighten the bolts to 25 30...

Page 9: ...n the idler arm see Figure 19 Re tighten the 3 8 bolt Turn the blade assembly by hand to insure free rotation Do Not Over Tension The Belt This will cause premature belt and bearing failure To check t...

Page 10: ...d cone See Figure 20 WARNING Protect Fan and Cone from Snow and Ice Buildup WARNING Fan and or cone damage caused by this type of external source WILL NOT be covered by AMERICAN COOLAIR warranties Fig...

Page 11: ...e disc assembly or premature bearing failure may be induced The damper door assembly should be wiped clean so that the doors will pivot freely open completely and close securely The interior sides of...

Page 12: ...USE UNLESS ELECTRICAL WIRING COMPLIES WITH ALL APPLICABLE CODES DO NOT WIRE WITHOUT PROVIDING FOR A POWER SOURCE DISCONNECT AT THE FAN ITSELF DO NOT SERVICE EXCEPT BY A QUALIFIED MAINTENANCE TECHNICIA...

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