Dometic BR36H70CR User manual

BR342 Ducted Installation Instructions
Australian Version –Electronic Wall Control
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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.
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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.
CAUTION!
Safety instruction: Failure to observe this instruction can lead to injury.
NOTICE!
Failure to observe this instruction can material damage and impair the function of the product.
NOTE
Supplementary information for operating the product.

BR342 Ducted Installation Instructions
Safety Instructions
•Please observe the prescribed safety instructions and stipulations from the vehicle manufacturer and
service workshops.
•The manufacturer accepts no liability for damage in the following cases:
−Faulty assembly or connection
−Damage to the product resulting from mechanical influences and excess voltage
−Alterations to the product without express permission from the manufacturer
−Use for purposes other than those described in the operating manual
•Note the following basic safety information when using electrical devices to protect against:
−Electric shock
−Fire hazards
−Injury
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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. Do not allow
them to use electrical devices without supervision.
•Persons whose physical, sensory or mental capabilities or whose lack of experience and knowledge prevent
them from using the device safely should not use it without supervision or instruction by a responsible person.
•Do not undo the upper cover of the roof air conditioner in the event of a fire. Use approved extinguishing
agents instead. Do not use water to extinguish fires.
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CAUTION!
•The roof air conditioner must be installed securely so that it cannot fall down.
•Only operate the roof air conditioner if you are certain that the housing and the cables are not damaged.
•Do not use the roof air conditioner near flammable fluids or in closed rooms.
•Make sure no combustible objects are stored or installed near the air outlet. A distance of at least 50 cm must
be kept.
•Do not reach into air outlets or insert any foreign objects in the device.

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. The refrigerant must never be released into the air.
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Safety Instructions –Handling Electrical Cables
WARNING!
•The electrical power supply may only be connected by a qualified electrician
CAUTION!
•Fit a fuse of at least 10 A to the connection with the vehicle’s power supply.
•Attach and lay the cables so that they cannot be tripped over or damaged.
NOTICE!
•Use cable ducts to lay cables through walls with sharp edges.
•Do not lay loose or bent cables next to electrically conductive materials (metal). Do not pull on the cables

BR342 Ducted Installation Instructions
Unit Data
•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.
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Roof Requirements
Roof Cavity Depth Duct Cross-Sectional
Area Duct Size Register Requirements Total System Static Pressure (Hi Fan, Grilles fitted)
50.8 to 139.7mm 13550mm² min
Depth: 38.1-63.5mm
Width: 177.8-254mm
Total Length: 4.5-12m
Short Run Length: 1/3 of Total
No. per Run: 4 min
Free Air Area: 9032mm²
Duct End Distance: 127-203mm
Elbow Distance: 381mm
1.8 to 3.0kPa
TableA –Air Distribution Duct Sizing & Design

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.
•For one unit installation:
−The unit should be mounted slightly forward of centre (front to back) and centred from side
to side.
•For two unit installations:
−Install one unit 1/3 and one unit 2/3’s from front of RV and centred 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. See table on right for maximum
acceptable tilt.
•After Location Has Been Selected:
−Check for obstructions in the area where unit will be installed. See (FIG. 1).
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BR342 Ducted Installation Instructions
Choosing a Fitment Location
•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).
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NOTICE!
Maintain structural integrity. Otherwise damage to product and/or RV could occur.
FIG. 2
431.8mm
431.8mm
431.8mm
431.8mm
19mm
38mm
38mm
31.75mm
44.45mm
Roof Preparation
WARNING!
Fire or Electrical Shock Hazard: Make sure there are no obstacles
(wires, pipes, etc.) inside RV’s [roof / floor / walls]. Shut OFF gas supply,
disconnect 240VAC power from RV, and disconnect positive(+) 12VDC
terminal from supply battery BEFORE drilling or cutting into RV. Failure to
obey these warnings could result in death or serious injury.

BR342 Ducted Installation Instructions
Roof Preparation
•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.
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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.
NOTICE!
Maintain structural integrity. Otherwise damage to product and/or RV
could occur.
NEVER create a low spot on RV roof. Otherwise, water will pool and
could cause a leak.
•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. Remember to provide an entrance hole for power
supplies, indoor temperature sensor (if applicable), thermostat communication
cable, and furnace wires (if applicable) at the front of the opening. See (FIG. 3).

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.
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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.
•All discharge air ducts must be properly insulated to prevent condensation from
forming on their surfaces or adjacent surfaces during operation of unit. This
insulation must be R-7 minimum. See (FIG. 4).
•Ducts and their joints must be sealed to prevent condensation from forming on
adjacent surfaces during operation of the unit.
•Return air openings must have 40 square inches minimum free area including the
filter.
•Return air to the unit must be filtered to prevent dirt accumulation on unit cooling
surface.
FIG. 4