Venmar HEPA 4000 Specifications download pdf (Page 16)

Plenum Supply or Exhaust Fan and Motor

To remove plenum fan and motor disconnect the four-wire

electrical cable from the motor junction box. Remove the

four bolts (#1, Figure 4) and slide the motor and plenum

fan past the inlet cone, then lift out of the unit. A 1¾”

socket is required to remove the fan from the motor shaft.

Both motor shaft and fan bore must be completely free

of paint, grease, oil and dirt. If necessary, clean the sur-

faces with non petroleum based solvent, such as isopropyl

alcohol. Insert the bushing into the fan, making sure the

mating hub is ﬂush against the shoulder at the ﬂats. Posi-

tion the assembly at the desired location on the motor

shaft and hand tighten nut (clockwise) until the assembly

becomes snug on the shaft.

Using a torque wrench and a 1¾” socket, tighten the

nut to the proper installation torque. See table below for

torque value.

Fan should overlap inlet cone by 3/8” [9 mm] and have a

clearance of 1/16” [1.6 mm]. Motor/fan assembly position

is adjustable by loosening the four bolts (#2, Figure 4) and

sliding shelf forwards and back.

Supply FANWALL

Array

FANWALL array of multiple direct driven plenum fan and

motor “cubes” are equipped with permanently sealed

bearings and do not require lubrication.

To remove the supply FANWALL and motor, follow the

steps outlined below:

1. Disconnect power to the fan/control panel before main-

tenance. Follow all lockout and tag out procedures.

2. Disconnect the four-wire electrical cable from the

motor junction box. Make note of wire locations for

reinstallation later.

3. Mark motor pedestal location on the motor pedestal

mounting angles (both sides), then loosen and re-

move (four) ½” pedestal bolts that retain the motor

pedestal to the mounting angles (see Figure 6).

Figure 4: Plenum fan and motor

IMPORTANT

No lubrication is necessary during servicing.

CAUTION

Do not hammer or use any type of impact to force the

bushing along the shaft.

CAUTION

The shaft must fully engage the shaft gripping area of

the bushing.

Table 2: Installation Torque Value

Shaft Size Ft-lb

5/8” to ¾” 100

13/16” to 1” 125

1-1/16” to 1¼“ 167

WARNING

Disconnect the main power switch to the unit before per-

forming service and maintenance procedures.

Figure 5: FANWALL and motor

VCES-VHC72-IOM-1H

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Venmar HEPA 4000 Specifications Page 16

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