Tjernlund VSUB Series Universal Blowers for Combustion Air or Draft 8504114 - Manual (Page 8)

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1000 CFM will require a minimum 15" x 15" opening to have a maximum capture velocity of 650'/min.
If an intake grille is 75% open, the area will need to increase to 17.25" x 17.25" to maintain a design maximum velocity of 650'/min.
2000 CFM will require a minimum 21" x 21" opening to have a maximum capture velocity of 650'/min.
If an intake grille is 75% open, the area will need to increase to 24.25 " x 24.25" to maintain the design maximum velocity of 650'/min.
4000 CFM will require a minimum 30" x 30" opening to have a maximum capture velocity of 650'/min.
If an intake grille is 75% open, the area will need to increase to 34.25" x 34.25" to maintain the design maximum velocity of 650"/min.
6000 CFM will require a minimum 36.5" x 36.5" opening to have a maximum capture velocity of 650'/min.
If an intake grille is 75% open, the area will need to increase to 42" x 42" to maintain the design maximum velocity of 650'/min.
INSTALLATION OF THE VSUB BLOWER
The VSUB Blower is designed to fit any type of industry standard 8", 12", 16" or 20" diameter vent pipe. Vent pipe must be installed
and supported according to manufacturer’s instructions, local codes and/or in accordance with NFPA 211, "Chimneys and Vents". The
VSUB Blower is rated for indoor or outdoor installation. Factory insulated vent pipe may reduce clearances to combustibles when pen-
etrating a combustible roof or wall. Refer to vent pipe manufacturer’s instructions for details.
Unless properly screened or guarded to prohibit contact with the blower wheel, a minimum of 3 feet of pipe must be connected to the
inlet/discharge of the VSUB Blower.
Do not use the VSUB Blower inlet or outlet collars to support the vent pipe. Support the vent pipe as instructed by the vent pipe man-
ufacturer.
The VSUB Blower housing can rotate 180 degrees in 45° increments, see “Housing Rotation”, Page 13. Always mount the VSUB
Blower so the shaft of the motor is horizontal and base is pointing down.
INSTALLING VSUB BLOWERS OUTDOORS WHEN USED AS A MECHANICAL DRAFT INDUCER
When installing VSUB Blowers outdoors as a mechanical exhauster, never orient the discharge vertically without installing a rain cap
or a vent pipe that alters the discharge to horizontal. Rain caps must be raised a distance equal to the vent diameter above the VSUB
Blower outlet. A minimum of 3 diameters of straight vent must be installed prior to connecting any elbow. Never connect a 90° elbow
directly to the discharge.
INSTALLING CONDENSATE DRAIN
IMPORTANT:
If the the VSUB Blower is mounted outdoors or potentially subject to condensation, we recommend the
use of the supplied condensate drain. Make sure to mount the condensate drain into the lowest point of
the VSUB Blower housing.
1. Use mounting plate as template and a drill bit for stainless steel to drill (4) 5/32" holes and (1) 1/2"
hole into lowest point of VSUB Blower housing, (See Diagram C)
2. Use supplied mounting screws to fasten mounting plate to the bottom of housing. Seal connection
with RTV sealant.
3. Connect to 3/8” NPT fitting and route drain to appropriate location.
MOUNTING FROM CEILING
1. Make sure the overhead support will handle 4 times the static weight of the Universal
Blower being installed, See “Specifications” on page 1.
2. To help prevent the VSUB Blower from swinging while operating we recommend mount-
ing the supports at a 30° angle, (See Diagram D).
3. Use either the provided eyebolts or 3/8" rod to suspend the VSUB Blower from overhead.
4. Make sure the VSUB Blower is mounted level and plumb. If necessary, rotate the housing
only for desired discharge angle, see “To Rotate Housing”, Page 14. Keep motor shaft parallel
with floor/roof and mounting base pointed down.
MOUNTING ON ROOF
1. Make sure the roof surface you plan to mount the VSUB Blower on is level.
2. When mounting on a roof we recommend using rooftop mounting support rails.
3. Make sure roof top mounting support rails are rated to handle the weight of the VSUB Blower, See “Specifications” on page 1.
4. Install vibration isolation pads between rooftop support rail and VSUB Blower base.
5. After positioning VSUB Blower remove the four eyebolts from the base and secure blower to roof rail with lag screws.
DIAGRAM C
MOUNT WITH SUPPORTS AT A 30
O
ANGLE TO PREVENT UNIT FROM
SWINGING.
DIAGRAM D
MOUNT AT LOWEST POINT IN
VSUB HOUSING.