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

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
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FIG. 5
7742mm² free area
per register
•These items must be determined in
conjunction with the Air Distribution
Duct System Sizing & Design
requirements. See "Table - Air
Distribution Duct Sizing & Design" on
page (4).

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
"TableA- Air Distribution Duct Sizing & Design" on page 6.
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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.
•This supply wire must be located in the front portion of the roof opening.
•The power MUST be on an appropriately sized separate time delay fuse or circuit breaker. The proper size protection
can be determined from data table on page 6.
•Make sure that at least 381mm of supply wire extends into the roof opening. This insures an easy connection at the
junction box.
•Protect the wire where it passed into the opening with approved method.
NOTE
If vent fan was removed, the existing wire may be used provided it is of proper size, location, and correctly
fused.

BR342 Ducted Installation Instructions
Placing Unit on Rooftop
•Remove the unit from the carton and discard carton.
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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.
•Lift and place the unit over the prepared opening using the gasket on the unit
as a guide. See (FIG. 4).
•Place the electronic wall control kit and the RAG kit inside the RV. These
boxes contain mounting hardware for the unit and will be used inside the RV.
FIG. 6
NOTE
This completes the outside work. Minor adjustments can be done
from inside the RV if required.

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.
•Reach up into the return air opening and pull the unit electric cord and control
cables down for later connection. See FIG. 9.
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FIG. 7
FIG. 8
FIG. 9

BR342 Ducted Installation Instructions
Installing the Unit
•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.
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FIG. 10
NOTICE!
Tighten mounting bolts to correct torque specifications. Overtightening
could damage 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 to 4.5 to 5.5 Nm. See FIG.10
•Measure the ceiling to roof thickness:
−If distance is 50.8 –95.25mm, remove perforated tab from divider plate. See FIG. 11.
−If distance is 95.25 –139.7mm, remove no tabs.
•Remove the backing paper from double-sided tape located on ceiling template.
See FIG. 11.
FIG. 11
Tighten to
4.5 to
5.5Nm
50.8 –95.25mm

BR342 Ducted Installation Instructions
Installing the Unit
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FIG. 11
NOTICE!
Incorrect installation of the divider could cause compressor to short-
cycle, 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. Make sure
the divider plate is properly positioned before pressing into place.
•With slight pressure push the divider plate against the double-sided tape on the
ceiling template.
•Locate the 3.2 × 177.8 × 457.2mm self-adhesive insulation supplied with the
RAG kit. Remove the backing paper from the insulation and carefully stick onto
the ceiling template divider plate. See FIG. 12.
FIG. 12

BR342 Ducted Installation Instructions
Installing the Unit
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•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.
•Connect the communication wire to the wire from the electronic wall control (also refer to instructions provided with the
wall control).
•Make connections for the 240VAC positive (+), negative (-) and earth from the supply to the rooftop unit and ensure they
are well insulated.
•Tuck any excess wire up out of the way.
WARNING!
Electrical Shock Hazard: Verify 240VAC power is disconnected from the RV. Failure to obey this warning
could result in death or serious injury.
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.

BR342 Ducted Installation Instructions
Installing the Return Air Cover
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•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.
FIG. 13

BR342 Ducted Installation Instructions
Fitment of Optional Condensation Drain Extension
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•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 12.7mm inner diameter and pushed
onto the drain pipe fitting on the bottom of the rooftop unit around 15mm to help
prevent detachment over time (refer to FIG. 14).
•The PVC tube should be routed around the foam support blocks on the underside of
the rooftop unit to ensure the tube does not get compressed.
•The condition of the PVC tube should be regularly checked to ensure it is free of any
defects that may prevent good drainage (such as being blocked, compressed or
kinked).
FIG. 14
NOTICE!
It is important to minimise sharp bends, kinks or high/low points in the tube as
it may prevent proper draining of the condensation, and in severe cases this
could result in water dripping inside the caravan.
NOTE
The PVC tube should NEVER raise higher than the level of the drain pipe
fitting.

BR342 Ducted Installation Instructions
Service –Unit does not Operate
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•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. Ensure fuse is not burnt, or circuit breaker is "ON" and not activated.
−After the above checks, call your local service centre 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 grille must be removed
from air distribution box to view.
−Air distribution box model and serial number found on rating plate located on ceiling template. Observe this rating plate through the filter
opening.
Contact Details