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WIRING DIAGRAMS SPECIFICATIONS REPLACEMENT PARTS SERVICE HINTS TECHNICAL SERVICE
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WIRING DIAGRAMS
Note: For proper operation of optional accessories, the wires from the switch to the control must be connected exactly as shown in Figure 42.
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UT | |
O | |
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ON | F |
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Thermopile
Figure 42 - Switch Wiring Diagram
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing.
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| Variable | Fan Switch | |||
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| Fan Switch | |||||
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| Off | 1 | 2 Black |
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| On | Blue |
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| Red | |
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110/115 |
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| V.A.C. |
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| Black |
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| Green |
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| Blower | |
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| White |
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| Motor | |
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Figure 43 - Blower Wiring Diagram |
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SPECIFICATIONS |
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| VI33NRA |
| VI33PRA | ||
Btu (Variable) | 20,000/30,000 | 20,000/33,000 | ||||||
Type Gas | Natural Gas Only | Propane/LP Only | ||||||
Ignition | Piezo |
| Piezo | |||||
Pressure Manifold | 3.5" W.C. |
| 8.0" W.C. | |||||
Inlet Gas Pressure (in. of water) |
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Maximum | 10.5" |
| 14" | |||||
Minimum* | 5" |
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| 11" | ||||
* For input adjustment |
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REPLACEMENT PARTS
Note: Use only original replacement parts. This will protect your warranty coverage for parts replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product. If they can’t supply original replacement part(s), call DESA International’s Technical Service Department at
•your name and address
•model and serial numbers of your heater
•how heater was malfunctioning
•type of gas used (propane/LP or natural gas)
•purchase date
Usually, we will ask you to return the part to the factory.
PARTS NOT UNDER WARRANTY
Contact authorized dealers of this product. If they can’t supply original replacement part(s), call DESA International at
•model number of your heater
•the replacement part number
SERVICE HINTS
When Gas Pressure Is Too Low
•pilot will not stay lit
•burners will have delayed ignition
•heater will not produce specified heat
•for propane/LP unit, propane/LP gas supply may be low
You may feel your gas pressure is low. If so, contact your local gas supplier.
TECHNICAL SERVICE
You may have further questions about installation, operation, or troubleshooting. If so, contact DESA International’s Technical Service Department at
You can also visit DESA International’s technical services web site at www.desatech.com.
For morevisit www.
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