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Dometic 3311931.000-20, Installation Instructions Manual, Page: 4 / 17

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Dometic 3311931.000-20 Installation Instructions Manual Download Page 4

4

A.  Table - Unit Data

Model No.

Nominal

Capacity

(BTU HR)

Cooling

Electrical

Rating

120 Vac

60 Hz 1 ph

Compressor

Rated Load

Amps

Compressor

Locked 

Rotor

Amps

Fan Motor

Rated Load 

Amps

Fan Motor

Locked

Rotor 

Amps

Refrigerant

R-410A

(oz)

Minimum

Wire Size*

12 AWG

Copper

Up to 24'

AC Circuit

Protection

***Installer

Supplied

Minimum

Generator

Size**

1 Unit / 2 Units

H540315.72X

13,500

12.7

68.0

2.8

8.0

19.5

20 Amp

3.5 kW / 5.0 kW

H540316.72X

15,000

13.2

70.0

2.8

8.0

21.0

20 Amp

3.5 kW / 5.0 kW

*  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.

B.  Roof Requirements

 

● 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 2 inches and maximum of 5 inches distance between roof to ceiling of RV.

C.  Table - Air Distribution Duct Sizing & Design

Return Air Grille Kit

3105007.XXX

3105935.XXX

Roof Cavity Depth

2.0 In. Min. - 5 In. Max.

Duct Cross Sectional Area

21.0 Sq. In. Min.

Duct Size

Depth

Width

Total Duct Length

Duct Length (short run)

1-1/2 In. Min. - 2-1/2 In. Max.

7.0 In. Min. - 10.0 In. Max.

15.0 Ft. Min. - 40.0 Ft. Max.

1/3 Total Duct Length

Register Requirements

Number Required

Supply Register Free Air Area

Return Register Free Air Area

Distance From Duct End

Distance From Elbow

4 Min.

14.0 Sq. In.

40.0 Sq. In.

5.0 In. Min. - 8.0 In. Max.

15.0 In.

Total System Static Air Pressure

Blower at High Speed,

Filter & Grille In Place

0.55 - 1.10 In. W.C. 

SPECIFICATIONS

Summary of Contents for 3311931.000-20

Page 1: ...All initial installations must be approved by Dometic Corporation Roof Top Unit Used With 3105007 XXX OR 3105935 XXX Return Air Grille Description Blizzard NXTTM Model Electronic Control Kit Thermostat Optional Indoor Temperature Sensor Air Conditioner CCC 2 Controls H540315 H540316 3312020 000 3314082 000 CCC 2 Blk 3314082 011 CCC 2 Wht 3311931 000 20 3311931 012 40 3311931 020 60 LCD SZ Controls...

Page 2: ...ion 13 L System Configuration 13 M Installing Return Air Cover 14 N CCC 2 System Only Reset Checkout 14 O CCC 2 System Only Furnace Aqua Temperature Differential Setting 14 GENERAL INFORMATION 15 A Heat Gain 15 B Condensation 15 WIRING DIAGRAMS 16 A Simple RV Wiring Diagram 16 B Unit Wiring Diagrams 17 C Electronic Control Kit Wiring Diagrams 17 INTRODUCTION This air conditioner hereinafter referr...

Page 3: ... and injuries A 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 B Understand Signal Words A signal word will identify safety messages and property damage messages and will indicate the degree or level of hazard seriousness indicates a hazardou...

Page 4: ... Time Delay Fuse or Circuit Breaker Required B Roof Requirements 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 2 inches and maxi...

Page 5: ...enter Line Of Unit Roof Opening 13 7 8 40 30 4 18 4 b Maintain structural integrity Otherwise damage to product and or RV could occur The roof must be designed to support 130 pounds when RV is in motion Normally a 200 lb static load design will meet this re quirement c Check inside the RV for return air grille here inafter referred to as RAG obstructions i e door openings room dividers curtains ce...

Page 6: ...ld oc cur 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 ther mostat communication cable and furna...

Page 7: ...s route a dedicated 12 Vdc supply wire 18 22 AGW to zone 1 and zone 3 roof open ing a This supply wire must be located in the front portion of the roof opening b Make sure that at least 15 of supply wire extends into the roof opening 3 Thermostat Communication Cable a CCC 2 Thermostat I Route a 4 conductor communication ca ble from the roof opening to the thermo stat mounting location using the sh...

Page 8: ...mostat Location 1 CCC 2 system without an optional indoor tem perature sensor and LCD SZ system a The proper location of the thermostat is very important to ensure that it will provide a com fortable RV temperature Observe the follow ing rules when selecting a location Locate the thermostat 54 above the floor Install the thermostat on a partition not on an outside wall NEVER expose the thermostat ...

Page 9: ... Remove the unit from the carton and discard carton 2 LIFTING HAZARD Use proper lifting technique and control when lifting product Failure to obey this caution could result in injury Place unit on roof 3 Do NOT slide unit Otherwise damage to gasket on bottom of unit may occur b Route the communication cable through the 2 diameter hole in the wall required for the thermostat See FIG 8 c Optional In...

Page 10: ...s manual will use a four 4 bolt pattern for installing the RAG kit These bolts and the electronic control box cover are furnished in the CCC 2 control kit 4 Reach up into the return air opening and pull the unit electric cord down for later connection See FIG 15 FIG 15 Gasket Furnace Wires Electrical Cord 120 Vac Power Supply Control Cables 5 Hold the ceiling template up to the roof opening Make s...

Page 11: ... is too high stick excess height of the insulation to the unit base pan Do not cover up unit rating plate f Place the electronic control box on the ceil ing template with the white 6 pin plug on the curb side of the RV Do NOT attach at this time FIG 16 Front Of Vehicle Tighten To Compress Gasket To 3 4 Roof Gasket Screws 6 Installation Of Divider Plate a Measure the ceiling to roof thickness If di...

Page 12: ... wires in the 6 wire harness Con nect 12 Vdc to the red wire 12 Vdc to the black wire 2 Connect the previously run furnace wires if ap plicable to the blue wires in the 6 wire harness 3 Terminate the 4 conductor communication cable s protruding from the roof opening The cable s must be terminated with a telephone RJ 11 6C4P connector Refer to the crimp tool manufacturer for crimping instructions R...

Page 13: ...s in stalled follow installation instructions furnished with AGS kit K 120 Vac Power Supply Connection ELECTRICAL SHOCK HAZARD Make sure 120 Vac power is disconnected from RV Failure to obey this warning could result in death or serious injury ELECTRICAL SHOCK HAZARD Provide grounding in compliance with all appli cable electrical codes Failure to obey this warn ing could result in death or serious...

Page 14: ...ferential of either 1 degree F or 2 degree F See FIG 26 1 To set the differential simultaneously press the PROGRAM button and the up button on the CCC 2 thermostat diF1 will appear in the display while the buttons are pressed See FIG 26 To set the 2 degree differential simul taneously press the PROGRAM button and the down button diF2 will appear in the display while the buttons are pressed FIG 26 ...

Page 15: ... a head start on the expected high outdoor ambient will greatly improve its ability to maintain the desired indoor temperature For a more permanent solution to high heat gain acces sories like Dometic outdoor patio and window awnings will reduce heat gain by removing the direct sun They also add a nice area to enjoy company during the cool of the evening GENERAL INFORMATION B Condensation The manu...

Page 16: ...16 A Simple RV Wiring Diagram OPTIONAL FIG 27 WIRING DIAGRAMS ...

Page 17: ...ms 1 H540315 H540316 Wiring Diagram FIG 28 C Electronic Control Kit Wiring Diagrams 1 3312020 000 CCC 2 Electronic Control Kit Wiring Diagram FIG 29 2 3313189 000 3313189 015 LCD SZ Electron ic Control Kit Wiring Diagram Cool Furnace FIG 30 ...

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