DOMETIC 459146.71X (01) PDF MANUAL

This manual has safety information and instructions to help users eliminate or reduce the risk of accidents and injuries. Read and understand these instructions before installing, using, servicing, or performing maintenance on this product. Incorrect installation, operation, servicing, or maintaining of this product can lead to serious injury. Follow all instructions.

Recognize Safety Information

This is the safety alert symbol. It is used to alert you to potential physical injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death.

Understand Signal Words

A signal word will identify safety messages and property damage messages, and will indicate the degree or level of hazard seriousness.

WARNING indicates a hazardous situation that, if NOT avoided, could result in death or serious injury.

CAUTION indicates a hazardous situation that, if NOT avoided, could result in minor or moderate injury.

NOTICE is used to address practices NOT related to physical injury.

General Safety Messages

WARNING: Failure to obey the following warnings could result in death or serious injury:

This product MUST be installed/serviced by a qualified service technician.

Do NOT modify this product in any way. Modification can be extremely hazardous.

Do NOT add any devices or accessories to this product except those specifically authorized in writing by Dometic Corporation.

The installation MUST comply with all applicable local or national codes, including the latest edition of the following standards:

U.S.A.

• ANSI/NFPA70, National Electrical Code (NEC)

• ANSI/NFPA 1192, Recreational Vehicles Code

CANADA

• CSA C22.1, Parts I & II, Canadian Electrical Code

• CSA Z240 RV Series, Recreational Vehicles

* For wire length over 24 ft., consult the National Electrical Code for proper sizing.

** Dometic Corporation gives GENERAL guidelines for generator requirements. These guidelines come from experiences people have had in actual applications. When sizing the generator, the total power usage of your RV must be considered. Keep in mind generators lose power at high altitudes and from lack of maintenance.

*** CIRCUIT PROTECTION: Time Delay Fuse or Circuit Breaker Required.

• A 14-1/4″ x 14-1/4″ (±1/8″) square opening (hereinafter referred to as “roof opening”) is required for installing this unit. This opening is part of the return air system of the unit and MUST be finished in accordance with NFPA 1192.

• Roof construction with rafters/joists support frames on a minimum of 16 inch centers.

• Minimum of 1.5 inches and maximum of 6 inches distance between roof to ceiling of RV.

When determining your cooling requirements, the following should be considered:

• Size of RV;

• Window area (increases heat gain);

• Amount of insulation in walls and roof;

• Geographical location where the RV will be used;

• Personal comfort level required.

Location Options:

1. Normal locations: The unit is designed to fit over an existing roof vent opening.

2. Other locations: When no roof vent is available or another location is desired, the following is recommended:

a. For one unit installation: The unit should be mounted slightly forward of center (front to back) and centered from side to side.

b. For two unit installations: Install one unit 1/3 and one unit 2/3’s from front of RV and centered from side to side.

It is preferred that the unit be installed on a relatively flat and level roof section measured with the RV parked on a level surface. The maximum acceptable tilt is 15° for models 459146 and B59146.

After Location Has Been Selected:

c. Check for obstructions in the area where unit will be installed.

d. NOTICE: Maintain structural integrity. Otherwise damage to product and/or RV could occur. The roof must be designed to support 130 pounds when the RV is in motion. Normally a 200 lb. static load design will meet this requirement.

e. Check inside the RV for air distribution box (“ADB”) obstructions (i.e. door openings, room dividers, curtains, ceiling fixtures, etc.).

WARNING: FIRE OR ELECTRICAL SHOCK HAZARD. Verify there are no obstacles inside RV’s roof and/or walls (wires, pipes, etc.). Shut OFF gas supply, disconnect 120 Vac power from RV and disconnect positive (+) 12 Vdc terminal from supply battery BEFORE drilling or cutting into RV. Failure to obey these warnings could result in death or serious injury.

If using an existing roof vent opening:

1. Unscrew and remove the roof vent.

2. Remove all caulking compound around opening.

3. Seal all screw holes and seams where the roof gasket will be located. Use a good grade of all weather sealant.

4. If the opening exceeds 14-3/8″ x 14-3/8″, it will be necessary to resize the opening. If the opening is less than 14-1/8″ x 14-1/8″, it must be enlarged. See “B. Roof Requirements” on page (4).

If creating a new opening:

If an existing roof vent opening will NOT be used a roof opening MUST be cut through the roof and ceiling of the RV. This opening MUST be located between the roof reinforcing members (rafters).

1. Carefully mark and cut the required 14-1/4″ x 14-1/4″ (±1/8″) roof opening.

2. NOTICE: Maintain structural integrity. Otherwise damage to product and/or RV could occur.

3. NOTICE: NEVER create a low spot on RV roof. Otherwise, water will pool and could cause a leak.

4. Using the roof opening as a guide, cut the matching hole in the ceiling.

5. The opening created must be framed to provide adequate support and prevent air from being drawn from the roof cavity. Framing stock 3/4″ or more in thickness must be used. Good rafters should be supported by cross beams. Frame the opening so it won’t collapse when bolting down the unit.

6. Remember to provide an entrance hole for power supplies at the front of the opening. Leave access for power supply wiring at least 15″ Min. at the front of the opening.

1. Route a copper, with ground, 120 Vac supply wire from the time delay fuse or circuit breaker box to the roof opening. Use a listed/certified non metallic – sheathed single strand cable. The proper size wire can be determined from the chart on page 4.

(i) If vent fan was removed, the existing wire may be used provided it is of proper type, size, location, and correctly fused.

a. This supply wire must be located in the front portion of the roof opening.

b. The power MUST be on an appropriately sized separate time delay fuse or circuit breaker. The proper size protection can be determined from the chart on page 4.

c. Make sure that at least 15″ of supply wire extends into the roof opening. This insures an easy connection at the junction box.

d. Protect the wire where it passes into the opening with approved method.

Part 1: Placing the Unit on the Roof

1. Remove the unit from the carton and discard the carton.

2. CAUTION: LIFTING HAZARD. Use proper lifting technique and control when lifting product. Failure to obey this caution could result in injury. Place unit on the roof.

3. NOTICE: Do NOT slide the unit. Otherwise, damage to gasket (on bottom of unit) may occur, and could cause a leak. Lift and place the unit over the prepared opening using the gasket on the unit as a guide.

4. Place the ADB kit inside the RV. This box contains mounting hardware for the unit and will be used inside the RV.

Part 2: Inside the RV Installation

1. Check gasket alignment of the unit over the roof opening and adjust if necessary. The unit may be moved from below by slightly lifting to center it.

2. Remove ADB and mounting hardware from the carton.

3. All models in this manual will use a four (4) bolt pattern for installing the ADB kit.

4. Reach up into the return air opening of the unit and pull the unit electrical cord down for later connection.

5. Duct Divider Installation:

a. Measure the ceiling thickness.

b. Cut away the number of rows from the duct divider as indicated in the table below. Start cutting from the indicated end.

c. Carefully install the duct divider in the roof opening 5-5/8″ from the back of the roof opening. The black side faces to the front, and the foil back faces the rear of the unit.

6. Ceiling Template Installation:

a. Plug the 6 pin electrical cord from the top unit into the matching 6 pin connector in the electronic control box. The plug is polarized and will only fit in one direction.

b. Install the supplied non-metallic cable connector in the junction box hole cutout with the proper orientation.

c. Route the previously run 120 Vac power supply wire through the cable connector and into the junction box.

d. Secure the 120 Vac power supply by tightening the cable connector clamp, making sure not to damage wires.

e. Hold the ceiling template up to the roof opening and line up the channel in the ceiling template with the previously installed duct divider.

f. Hold the ceiling template up to the roof opening and start each of the four (4) mounting bolts, by hand, through the ceiling template and up into the unit base pan. For models 459146 and B59146, use bolt locations A, D, E & H.

g. NOTICE: Tighten mounting bolts to correct torque specifications. Overtightening could damage the unit’s base pan or ceiling template. Not enough torque will allow an inadequate roof seal, and could cause a leak. Tighten all four (4) mounting bolts EVENLY within 40 to 50 inch pounds.

Part 3: Wiring System Connection

1. WARNING: ELECTRICAL SHOCK HAZARD. Verify 120 Vac power is disconnected from the RV. Failure to obey this warning could result in death or serious injury.

2. WARNING: ELECTRICAL SHOCK HAZARD. Provide grounding in compliance with all applicable electrical codes. Failure to obey this warning could result in death or serious injury.

3. Connect white to white; black to black; using appropriate size connectors. Secure bare copper wire under the grounding screw in the junction box.

4. Tape the connectors to the supply wire to ensure they don’t vibrate loose.

5. Push the wires into the junction box and install the junction box cover and screw.

Part 4: Installing the Air Distribution Box (ADB)

1. Align the ADB with the ceiling template. Note that the front and rear vent doors are supplied loose. Do NOT install them until all screws are installed.

2. Install two (2) (supplied) sheet metal screws inside the return air opening to secure the ADB to the ceiling template.

3. Install eight (8) (supplied) wood screws inside the front, rear, and side doors to secure the ADB to the ceiling.

4. Install the front and rear doors.

5. Place the filter in the return air vent grille. It may already be installed on some units.

6. Install the return air vent grille into the ADB. Slide the return air vent grille tab into the slot in the ADB and rotate up and snap in place.

7. Install the control knobs into the ADB.

Part 5: Final Checks

1. The unit installation is now complete and is ready for operation. The power supply to the unit may now be turned on.

2. Verify that all features of the installed system work. Please read the operating instructions before attempting to run the unit.

1. Selector Switch: The selector switch has seven positions including “OFF”. It controls the fan speeds, cooling modes, and heating modes of operation.

2. Thermostat: The thermostat dial controls the compressor ON/OFF operation within a temperature range of approximately 65° F and 90° F measured at the ADB inlet. Turning it towards “Colder” lowers the set temperature.

3. “OFF” Position: Use the “OFF” position on the selector switch to turn the unit off.

1. Turn the selector switch to a cooling position (blue graphic).

2. Set the thermostat to the desired temperature level.

3. Select the fan speed that best satisfies your needs:

a. HIGH COOL: Selected when maximum cooling and dehumidification is required.

b. LOW COOL: Selected when the room is at the desired comfort level and needs to be maintained. This speed is normally used for nighttime operation.

The compressor will cycle on and off as cooling is required to maintain the selected temperature level. The fan runs when the compressor is off to help keep the temperature uniform throughout the RV.

NOTICE: Wait at least 2 minutes before restarting the compressor when it has been manually cycled off with either the selector switch or the temperature set lever. Otherwise, the compressor will quick-cycle and could result in compressor or supply circuit overload.

The heat pump mode of operation will NOT replace a furnace for heating your RV in cold weather. The intent is to remove the chill on cool days or mornings.

1. Set the thermostat to the desired temperature level.

2. Turn the selector switch to a heating position (red graphic). There are two positions to select from (high and low).

3. The blower will come on immediately. The heat function will start if the thermostat is not satisfied.

The compressor will cycle on and off as heating is required to maintain the selected temperature level. The fan runs when the compressor is off to help keep the temperature uniform throughout the RV.

NOTICE: Wait at least 2 minutes before restarting the compressor when it has been manually cycled off with either the selector switch or the temperature set lever. Otherwise, the compressor will quick-cycle and could result in compressor or supply circuit overload.

This will circulate the air in your RV without cooling or heating.

1. Turn the selector switch to a fan position (black graphic). There are two positions to select from (high and low).

1. Slide the lever on the ADB to open and close the center air discharge vents.

Air Filter

Periodically (a minimum of every 2 weeks of operation) remove the return air filter located behind the return air vent grille and wash it with soap and warm water, let dry and then reinstall.

NEVER run unit without return air filter in place. This will plug the unit evaporator coil with dirt and may substantially degrade the performance of the unit over time.

ADB Housing

Clean ADB housing and control panel with a soft cloth dampened with a mild detergent. Never use furniture polish or scouring powders.

Fan Motor

The blower motor is factory lubricated and requires no service.

1. On Cooling Coil

a. Frost on a small portion of the coil is not unusual. Under certain conditions, ice may form on the evaporator coil. This is indicated by very cold output at very low air speed and the icing can be seen through the air inlet hole with the filter removed. If this should occur, inspect the filter and clean if dirty. Make sure air vents are open and not obstructed. Units have a greater tendency to frost when the outside temperature is relatively low. This may be prevented by adjusting the thermostat control knob to a warmer setting (counter clockwise). Should frosting continue, operate on any FAN ONLY setting until the cooling coil is free of frost; then resume normal operation. If frost condition persist, contact your local service center for assistance.

2. On Outdoor Coil While Heating

a. Operation at low outdoor temperatures causes low coil temperatures. This can result in ice forming on the outdoor coil in certain conditions. This is indicated by reduced heat output and could fully stop fan rotation in extreme conditions. To avoid this, the system controls turn off the compressor if outdoor temperature drops below 42° F and returns heating when the temperature raises 5° F.

The ability of this air conditioner to maintain the desired inside temperature depends on the heat gain of the RV. Some preventative measures taken by the occupants of the RV can reduce the heat gain and improve the performance of the air conditioner. During extremely high outdoor temperatures, the heat gain of the vehicle may be reduced by:

1. Parking the RV in a shaded area

2. Using window shades (blinds and/or curtains)

3. Keeping windows and doors shut or minimizing usage

4. Avoiding the use of heat producing appliances

Operation on High Fan/Cooling mode will give optimum or maximum efficiency in high humidity or high outside temperatures.

Starting the air conditioner early in the morning and giving it a “head start” on the expected high outdoor ambient will greatly improve its ability to maintain the desired indoor temperature.

The manufacturer of this unit will not be responsible for damage caused by condensation forming on ceilings, windows, or other surfaces. Air contains water vapor which condenses when temperature of a surface is below Dew point. During normal operation this unit is designed to remove a certain amount of moisture from the air, depending on the size of the space being conditioned. Keeping doors and windows closed when this air conditioner is in operation will greatly reduce the chance of condensation forming on interior surfaces.

If your unit fails to operate or operates improperly, check the following before calling your service center.

• If RV connected to motor generator, check to be sure motor generator is running and producing power.

• If RV connected to power supply by a land line, check to be sure line is sized properly to run unit load and it is plugged into power supply.

• Check your fuse or circuit breaker to see if it is open. Insure fuse is not burnt, or circuit breaker is “ON” and not activated.

• After the above checks, call your local service center for further help. This unit must be serviced by qualified service personnel only.

When calling for service, always give the following:

• Unit model and serial number found on the identification label located on base pan of unit bottom. Return air vent grille must be removed from ADB to view.

• ADB model and serial number found on rating plate located on ceiling template. Observe this rating plate through the filter opening.