BR342 Ducted Installation Instructions Australian Version – Electronic Wall Control 1
BR342 Ducted Installation Instructions Introduction • The BR342 reverse cycle rooftop air-conditioner is designed for installation onto Recreational Vehicles (RV’s) at the time of manufacture or as a replacement for an existing ducted rooftop unit. Explanation of Symbols DANGER! Safety instruction: Failure to observe this instruction will cause fatal or serious injury. WARNING! Safety instruction: Failure to observe this instruction can cause fatal or serious injury.
BR342 Ducted Installation Instructions Safety Instructions • Please observe the prescribed safety instructions and stipulations from the vehicle manufacturer and service workshops.
BR342 Ducted Installation Instructions Safety Instructions – Handling the Device WARNING! • Installation and repair of the roof air conditioner may only be carried out by qualified personnel who are familiar with the risks involved and the relevant regulations. Inadequate repairs may cause serious hazards. For repair service, please contact the service centre in your country (addresses on the back page). • Electrical devices are not toys. Keep electrical devices out of reach of children or infirm persons.
BR342 Ducted Installation Instructions Safety Instructions – Handling the Device NOTICE! • Only use the device as intended. • The roof air conditioner is not suitable for use in agricultural or construction vehicles. • Do not make any alterations or conversions to the device. • Never drive through automatic car washes when the roof air conditioner is mounted. • If faults occur in the refrigerant circuit, the system must be checked by a specialist company and repaired properly.
BR342 Ducted Installation Instructions Unit Data Roof Requirements • A 350mm×350mm (±3.17mm) square opening (hereinafter referred to as "roof opening") is required for installing this unit • Roof construction with rafters/joists support frames on a minimum of 405mm centres. • Minimum of 38mm and maximum of 152mm distance between roof to ceiling of RV. Roof Cavity Depth Duct Cross-Sectional Area Duct Size Register Requirements Total System Static Pressure (Hi Fan, Grilles fitted) 50.8 to 139.
BR342 Ducted Installation Instructions Choosing a Fitment Location • This unit is specifically designed for installation on the roof of an 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.
BR342 Ducted Installation Instructions Choosing a Fitment Location NOTICE! Maintain structural integrity. Otherwise damage to product and/or RV could occur. • The roof must be designed to support 59 kg when the RV is in motion. Normally a 90.7kg. static load design will meet this requirement. • Check inside the RV for return air grille (RAG) obstructions (i.e. door openings, room dividers, curtains, ceiling fixtures, etc.). See (FIG. 2). FIG. 2 431.8mm 19mm 431.
BR342 Ducted Installation Instructions Roof Preparation NOTE Opening Requirements: Before preparing the ceiling opening, the type of system options MUST be decided upon. Read all of the following instructions before beginning the installation. • Carefully mark and cut the required roof opening. See “Roof Requirements" section on pg 6. • Using the roof opening as a guide, cut the matching hole in the ceiling. NOTICE! Maintain structural integrity. Otherwise damage to product and/or RV could occur.
BR342 Ducted Installation Instructions Air Distribution Duct Sizing & Design • The installer of this system must design the air distribution system for their particular application. Several requirements must be met for the unit to operate properly. NOTICE! Make sure ductwork will NOT bend or collapse during and after installation, and that it is correctly insulated and sealed. Otherwise, damage to roof structure and ceiling could occur.
BR342 Ducted Installation Instructions Air Distribution Duct Sizing & Design • Dometic recommends the basic configuration shown in (FIG 6), for installing this system. We have found by testing, that this configuration works best in most applications. It is the responsibility of the installer to review each RV floor plan to determine the following: − Duct size − Duct layout − Register size − Register location − Thermostat location − Indoor Temperature Sensor Location FIG.
BR342 Ducted Installation Instructions Air Distribution Duct Sizing & Design • These items must be determined in conjunction with the Air Distribution Duct System Sizing & Design requirements. See "Table A - Air Distribution Duct Sizing & Design" on page 6. Wiring Requirements • Route a copper, with ground, 240VAC supply wire from the time delay fuse or circuit breaker box to the roof opening. The proper size wire can be determined from chart on page 6.
BR342 Ducted Installation Instructions Placing Unit on Rooftop • Remove the unit from the carton and discard carton. CAUTION! Lifting Hazard: Use proper lifting technique and control when lifting product. The rooftop unit weighs approximately 35 kg. Follow occupational health of safety guide when lifting or moving the unit. Failure to obey this caution could result in injury. Place unit on the roof. NOTICE! Do NOT slide unit. Otherwise, damage to gasket (on bottom of unit) may occur, and could cause a leak.
BR342 Ducted Installation Instructions Installing the Unit • Check gasket alignment of the unit over the roof opening and adjust if necessary. Unit may be moved from below by slightly lifting. See FIG. 7. • Remove return air cover and ceiling template from carton. See FIG. 8. • The unit is fixed using a four (4) bolt pattern for installing the RAG kit. These bolts and the electronic wall control are supplied separately.
BR342 Ducted Installation Instructions Installing the Unit FIG. 10 • Hold the ceiling template up to the roof opening. Make sure the large plate faces the rear of the RV. See FIG. 10. • Start each mounting bolt through the ceiling template and up into the unit base pan by hand. Install wood screw in each end of the ceiling template. This ensures a tight fit of the return air cover to ceiling. See FIG. 10. NOTICE! Tighten mounting bolts to correct torque specifications.
BR342 Ducted Installation Instructions Installing the Unit FIG. 11 NOTICE! Incorrect installation of the divider could cause compressor to shortcycle, resulting in supply circuit overload and reduced product performance. • Place the divider plate up to bottom of the unit base pan firmly. The foam tape on the divider plate must seal to bottom of base pan. See FIG. 11. NOTE The adhesive on the double-sided tape is extremely sticky.
BR342 Ducted Installation Instructions Installing the Unit • Excess width is intended to seal the divider plate to the sides of the roof opening. This is to help prevent cold air discharge from circulating into the unit return air opening. • If the insulation is too high, stick excess height of the insulation to the unit base pan. Do not cover up unit rating plate. Wiring Connections • Fix the return air sensor so it is position in the return air stream.
BR342 Ducted Installation Instructions Installing the Return Air Cover • Remove the return air grille from the return air cover. • Place the return air cover up to the ceiling template. • Install cover to template using six (6) supplied #8 x 3/8″ blunt point Phillips head screws. • Re-install filter return air grille into return air cover. Align tabs with mating notches and snap into place. • Install two (2) hole plugs into screw holes in back of return air cover. See FIG. 13. 18 FIG.
BR342 Ducted Installation Instructions Fitment of Optional Condensation Drain Extension • The unit features condensation drain outlets which allow the fitment of a PVC tube in order to channel the condensation water to a specific area. For example it can be used to channel the condensation water to the rear of the caravan or RV and prevent runoff to the sides where doorways or windows are. FIG. 14 shows one example setup. • Commonly available PVC tubing should be used of 12.
BR342 Ducted Installation Instructions Service – Unit does not Operate • If your unit fails to operate or operates improperly, check the following before calling your service centre. − If RV connected to generator, check to be sure the 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.
BR342 Ducted Installation Instructions Wiring Diagram – Heat Pump BR36H70CR 21
