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3. Description & Operation
The Grant SpiraVac pellet feed system consists of the following items
3.1 Vacuum Unit
The vacuum unit is designed to be mounted on the top of either the single or double Spira pellet hopper.
The pellet hopper, supplied with the boiler, has a removable cover on the top rear panel to allow fitting of
the vacuum unit. Refer to Section 4 for vacuum unit installation details.
The vacuum unit can be fixed to the top rear panel of the pellet hopper to face in any one of three
directions; with the control panel facing forwards, to the right or to the left.
Figure 3-1. Front view of vacuum unit
Figure 3-2. Rear view of vacuum unit
The vacuum unit contains a vacuum motor that pulls air through the cyclone. Air to cool the vacuum
motor is drawn in through a vent in the top of the enclosure and exhausted through an opening in the
rear. Refer to Figures 3-1 and 3-2.
IMPORTANT: Ensure that the cooling vents on the top and at the rear of the vacuum unit are not
obstructed at any time.
The cyclone section of the vacuum unit is located below the enclosure (located within the top part of the
pellet hopper when fitted). It is fitted with a counterbalanced trap door at the bottom. This door is drawn
closed by the vacuum generated when the motor is running. When the motor stops, and the vacuum
ceases, the weight of the pellets collected in the cyclone pushes the door open and the pellets are
deposited into the hopper.
The unit also incorporates a vacuum switch, that is operated by the vacuum produced by the vacuum
motor in order for the auger unit (located on the bulk pellet store) to run. Thus the auger motor can only
run when the vacuum motor is operating.
The vacuum unit is lined with acoustic insulation to reduce the noise level.
Two steel connection spigots are provided, on the rear face of the unit, for connection of the vacuum
system flexible tubes. Refer to Figure 3-2.
Summary of Contents for WPVKIT10
Page 12: ...12 Figure 3 6 SpiraVac operation flow diagram ...
Page 22: ...22 Figure 5 4 Vacuum unit wiring diagram ...
Page 24: ...24 Figure 5 6 Heating system controls S plan type system connection diagram ...
Page 25: ...25 Figure 5 7 Heating system controls Y plan type system connection diagram ...