Installation
Concrete Slab
The first step in unit installation is to pour a concrete slab capable of holding the unit weight as a base. The slab should have a proper gravel drainage bed.
Concrete Slab Dimensions
Housing Size | A | B | C | D | E |
20 | 64 | 64 | 42 | 40 | 40 |
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30 | 77 | 76 | 42 | 52 | 53 |
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40 | 78 | 135 | 42 | 54 | 111 |
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50 | 87 | 180 | 42 | 63 | 153 |
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All dimensions are shown in inches.
NOTE
If optional service platform is included, a minimum of 42 inches must be added to Dimension B.
Building Wall
Approx. Stand Feet Locations
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| Concrete Slab |
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B 
C
Concrete Slab and Unit Footprint
Service and Access Clearance
The slab should be positioned to allow 3 feet of clearance on the control end of the unit and 2 feet of clearance on the other three sides. Housing size 50 requires 3 feet of clearance on both ends because of filters access. Note that the concrete forms a 1 foot wide apron on all four sides of the unit unless a 42 in. extension is added to the control end of the unit.
Clearance to Combustibles
| Floor | Top |
| Sides | Ends |
Insulated/ | 0 in. | 0 in. |
| 0 in. | 0 in. |
Units | (0 mm) | (0 mm) |
| (0 mm) | (0 mm) |
Non Insulated | 0 in. | 6 in. |
| 6 in. | 6 in. |
Units | (0 mm) | (152.4 mm) |
| (152.4 mm) | (152.4 mm) |
Clearance to combustibles is defined as the | minimum distance required | ||||
between the heater and adjacent combustible surfaces to ensure the adjacent surface’s temperature does not exceed 90 degrees above the ambient temperature.
Burner/Blower Section
Use a crane and a spreader bar hooked to the factory lifting lugs (shown below) to lift and center the unit onto the filter stand section. The sections should be caulked together.
Install Ductwork
This table shows the duct sizes and straight lengths recommended for optimal performance (AMCA Publication
Recommended Supply Ductwork Sizes
VSU | Duct Size | Straight Duct Length |
Blower Size | (in.) | (in.) |
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108 | 10x13 | 32 |
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109 | 14x13 | 38 |
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110 | 16x14 | 42 |
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112 | 18x16 | 48 |
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115 | 19x16 | 49 |
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118 | 24x22 | 64 |
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120 | 28x28 | 79 |
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218 | 68x24 | 114 |
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220 | 68x26 | 118 |
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225 | 104x37 | 175 |
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230 | 104x37 | 203 |
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Model VSU
®