Dometic B57915 Air Conditioner Instruction Manual
Dometic B57915 Air Conditioner
Dometic B57915 Air Conditioner Instructions
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Dometic B57915 Air Conditioner Specifications
| Feature | Specification |
|---|---|
| Product type | Rooftop air conditioner for recreational vehicles (RV) |
| Model / version | B57915 (B57915.71X) |
| Nominal cooling capacity | 13,500 BTU/hr |
| Electrical rating | 120 Vac, 60 Hz, single phase |
| Compressor rated load amps | 12.4 A |
| Compressor locked rotor amps | 68.0 A |
| Fan motor rated load amps | 2.5 A |
| Fan motor locked rotor amps | 5.8 A |
| Refrigerant | R-410A, 18.0 oz |
| Minimum wire size | 12 AWG copper, for runs up to 24 ft (longer runs per NEC) |
| AC circuit protection | 20 A time delay fuse or circuit breaker (installer supplied) |
| Minimum generator size | 3.5 kW (1 unit) / 5.0 kW (2 units) |
| Compatible air distribution box (ADB) | 3314851.000 |
| Control type | Integral mechanical |
| Nominal unit dimensions (FIG. 2) | 12-7/8″ height; 27-5/8″ and 29-5/8″ footprint dimensions |
| Roof opening position | 18″ from front edge of unit |
| Roof opening size | 14-1/4″ x 14-1/4″ (±1/8″) |
| Maximum roof tilt | 15° in all directions |
| Roof framing requirement | Rafters/joists on minimum 16 inch centers |
| Roof-to-ceiling distance | 1.5 in minimum to 6 in maximum |
| Roof load requirement | 130 lb with RV in motion (200 lb static design normally sufficient) |
| Ceiling thickness range for duct divider | 1.5 in to 6.5 in (0 to 9 rows cut) |
| Mounting bolt pattern | Four bolts, locations A, D, E and H |
| Mounting bolt torque | 40 to 50 inch-pounds, tightened evenly |
| Thermostat range | Approximately 65 °F to 90 °F (measured at ADB inlet) |
| Selector switch | 8 positions including OFF |
| Fan speeds | High, medium and low |
| Heating | Optional electric heat strip (OPT HEAT position) |
| Applicable standards | NEC ANSI/NFPA 70, ANSI/NFPA 1192, CSA C22.1, CSA Z240 RV Series |
| Manual reference | Form No. 3315079.016, Revision D (01/18) |
Dometic B57915 Air Conditioner Details
The Dometic B57915 is a low-profile rooftop air conditioner for RVs. It can go on during manufacture or be retrofitted later. The design fits over an existing roof vent opening, so most installs need no new cut. One person can install it with brief help from a second person. The manual tells you to plan cooling needs around the RV's size, window area, insulation, the climate where it will be used and the comfort level you want.
If there's no roof vent to use, a single unit should sit slightly forward of center (front to back) and centered side to side. For two-unit setups, place one unit one third of the way back from the front and the other two thirds back, both centered side to side. Before cutting, check the roof for obstructions in the airflow area. Inside, check where the air distribution box will go and make sure it clears doors, room dividers, curtains and ceiling fixtures.
A new opening has to sit between the roof reinforcing members. Frame it with lumber at least 3/4″ thick so the frame doesn't collapse when the unit is bolted down and air isn't drawn from the roof cavity. Never create a low spot on the roof, because water will pool there and can cause leaks. To reuse an old vent opening, remove the old caulking and seal the screw holes and seams with an all-weather sealant.
The 120 Vac supply must be a grounded copper cable with non-metallic sheathing on its own dedicated circuit. Run it into the front of the opening and leave at least 15″ of wire inside. The unit connects to the control box through a polarized 6-pin plug that fits only one way. At the junction box, connect white to white and black to black, put the ground wire under the grounding screw, and tape the connectors so vibration can't loosen them.
Never slide the unit across the roof, because that can damage the bottom gasket and cause leaks. Lift it into place and use the gasket as a guide. From inside, cut the foam duct divider to match the ceiling thickness. Install it 5-5/8″ from the back of the opening with the foil side facing the rear. The ADB is held by two sheet metal screws and eight wood screws. The front and rear vent doors go on last.
For cooling, turn the selector to the blue graphic and choose HIGH, MEDIUM or LOW COOL. Use high for the most cooling and dehumidification and low for quiet night operation. The fan keeps running when the compressor cycles off, so temperatures stay even. After switching the compressor off manually, wait at least 2 minutes before restarting it to avoid overloading the compressor or circuit. The optional heat strip only takes the chill off. It doesn't replace a furnace.
Clean the return air filter at least every two weeks of use with soap and warm water. Never run the unit without the filter, because dirt will clog the evaporator coil. Wipe the ADB housing with a mild detergent and don't use polish or scouring powder. The blower motor is factory lubricated and needs no service. If the coil frosts, clean the filter, raise the thermostat setting or run the fan alone until the frost clears.
Frequently Asked Questions (FAQs)
Can't find the answer you need? Here are some frequently asked questions about the Dometic B57915 Air Conditioner, and we answer them below.
