Greenheck Fan SSDFDR-XXX DFDR-XXX Blade Orientation, Damper Maintenance, Damper Troubleshooting

6. Round Duct Connections

Round duct connections shall be attached with #8 sheet metal screws as follows:

•Ducts 22 in. (559mm) dia. and smaller shall have three screws.

•Ducts larger than 22 in. (559mm) dia. and up to including 24 in. dia. shall have five screws.

NOTE: All breakaway connections described may have duct sealant, PA2084T Duct Sealant Adhesive manufactured by Precision or DP1010 Water Base Duct Sealant manufactured by Design Polymetrics, applied in accordance with SMACNA recommendations.


JO


JO
PD

.BYJNVN

 JO PD	 JO PD	$FJMJOH 3VOOFS
.BYJNVN	.BYJNVN
NFUBM TUVET	NFUBM TUVET
		 JO 
	 1BOIFBE
	4DSFXT	 JO 
 JO PD	 JO PD
.BYJNVN	.BYJNVN
XPPE TUVET	XPPE TUVET

DFDR-XXX Blade Orientation

Fig. 4 'MPPS
3VOOFS

Axle		30°
	Axle
	30°	Axle
30° Off Horizontal	30° Off Horizontal	Normal
(Maximum)	(Maximum)

Damper Maintenance

Dampers do not typically require maintenance as long as they are kept dry and clean. If cleaning is necessary, use mild detergents or solvents. If lubrication is desired for components such as axle bearings, do not use oil-based lubricants or any other lubricants that attract contaminants such as dust.

Dampers must be maintained, cycled, and tested at intervals not less than every six months and in accordance with the latest editions of NFPA 90A & 92A, UL864 and local codes.

Damper Troubleshooting

The following is a possible cause and correction list for common concerns with the dampers.

Symptom	Possible Cause	Corrective Action
	Frame is out of round causing blades to	Adjust frame such that it is round
Damper does not fully open and/or fully	interfere with frame
	Screws interfere with blade	Locate screws and remove
close
	Contaminants on damper	Clean with a non-oil based solvent (see
		Damper Maintenance)
Link separated	Heat	Replace link

	Copyright © 2006 Greenheck Fan Corporation
4	462721 DFDR-XXX FS Rev. 4 December 2006