Dometic SMX II Description And Installation Manual
  1. Manuals
  2. Brands
  3. Dometic Manuals
  4. Industrial Equipment
  5. SMX II
  6. Description and installation manual

Dometic SMX II Description And Installation Manual

Dx modulating control system
Hide thumbs
Table of Contents

Advertisement

Quick Links

DX Modulating A/C System
INSTALLATION • OPERATION
For DX Modulating SMX II Control Systems using
SMXII and SMXir displays
Revised: 08-29-06
L-0952
English
Part Number: LP-28

Advertisement

Table of Contents
loading

Related Manuals for Dometic SMX II

Summary of Contents for Dometic SMX II

  • Page 1 DX Modulating A/C System INSTALLATION • OPERATION For DX Modulating SMX II Control Systems using SMXII and SMXir displays Revised: 08-29-06 L-0952 English Part Number: LP-28...

  • Page 3: Table Of Contents

    Table of Contents Modulating A/C Systems • Introduction Modulating A/C Systems • Operation Drawings and Diagrams ..............4 Operating Instructions - SMX II Control Systems Air Conditioner Basics ..............4 The SMX Keypad/Display ............... 17 The Effect of Seawater Temperature ..........4 The SMXir Remote Control ............

  • Page 4: Modulating A/C Systems • Introduction

    The unit will operate at higher water temperatures, but at any statements or procedures in this manual that you reduced capacity. As the water temperature rises, so does do not understand, contact the Dometic Applications the refrigerant pressure. A high-pressure safety switch will Department for assistance. Phone 804-746-1313...

  • Page 5: How It Works In Detail

    in the condenser coil. The seawater pump circulates rela- When cooling is called for by the thermostat control of one of the cooling/heating units, a signal is sent to the compressor tively cool seawater through the inner tube in the condenser coil.

  • Page 6: Subsystems

    System Controls The SMX II microprocessor circuit board, controlled by the If heat is needed, the solenoid valve closes, stopping the SMXir keypad/display, provides a comfortable environment flow of refrigerant through the evaporator coil. The electric and ensures overall system protection.

  • Page 7: Modulating A/C System • Installation

    Modulating A/C System • Installation Installation Procedures equipment at 50Hz, the voltage should be reduced by 17% to prevent overheating a motor. This section covers the installation procedures for the Cruisair Modulation System, including electrical connections and SMXir control installation. Please read and understand Installing The Condensing Unit this manual before attempting to install any equipment.

  • Page 8: Installing The Seawater Cooling System

    Seacock Installing the Seawater Cooling System A bronze, full flow seacock (ball valve type) should be The seawater system consists of a scoop-type thru-hull installed directly onto the through-hull fitting. Use Teflon tape fitting, water shut-off valve or seacock, strainer, seawater or other sealant on the threads.

  • Page 9: Overboard Discharge

    Overboard Discharge Installing The Cooling/Heating Unit The overboard fitting should be located 1 to 2 inches (25-50 mm) above the vessel’s water line. This is to facilitate visual Safety Warning confirmation of water flow, but close enough to the water to A Cruisair cooling/heating unit should never be placed minimize splashing noise.

  • Page 10: Mounting The Cooling/Heating Unit

    Mounting the Cooling/Heating Unit The copper tubing is connected to the condensing unit, distribution manifolds, and cooling units with flare joints. To Mount the cooling/heating unit (Figure 2) so the condensate prevent refrigerant leaks, flares must be formed correctly drip pan is beneath the unit. Use the integral mounting with the proper flaring tool.

  • Page 11: Discharge Air Grill

    RJ12 (phone-type) 6-pin plugs on each end. SMX II Control System The SMX II control system consists of: CXP cables are available in different lengths, from 2 feet (.6m) to 80 feet (24m). Route the cable from the power/logic Power/Logic (P/L) module - Monitors and controls all board to the keypad.

  • Page 12: Installing The Temperature Sensor

    Wiring diagrams are included in the back of this manual some heat dissipation. and under the cover of the electrical boxes on all units. Contact Dometic if you have any questions about the wiring diagrams. Ignition Protection Warning • Each A/C condensing unit requires its own dedicated PR3X and PR8X pump relays are certified ignition circuit breaker of the appropriate size.

  • Page 13: Three Phase Power

    • Each cooling unit that has electric heat should have its • Bond the ground lug on the condensing unit to the ship’s own separate circuit breaker. Cooling-only cooling units grounding system. have only a blower and solenoid that require electrical •...

  • Page 14: Inspecting The Refrigerant Connections

    Inspecting the Air Distribution System As more hot (high-pressure) gas is dumped into the suction line (due to cooling units shutting down), the superheat • Is there unobstructed airflow from the return air grill to the (suction gas temperature going into the compressor) can rise coil? to unsafe levels.

  • Page 15: Adjusting The Charge

    5. Accurate thermometer. 11. Remove both condensing unit base valve stem caps from top of base valves. Ensure that both white gauge 6. Thermometer to measure superheat. port caps, and the red vacuum port cap, are in place and tight. Open both base valves fully by turning the valve Proceed as follows: stems fully counter-clockwise.

  • Page 16: Removing Refrigerant From The System

    Initial Start Up 8. At this point the system is under-charged and may go into a low-pressure situation in which the hot gas bypass 1. Open the seacock (seawater inlet valve). valve may open. To test if that valve is open, touch the 2.

  • Page 17: Modulating A/C Systems • Operation

    The SMXir and SMX II keypad/displays are arranged for 12. HEAT Key logical operation. The button layouts on the SMXir and the Turns the system on in the electric heat mode. SMX II are similar, and the buttons perform the same respective functions. Hint 1. Data Display...

  • Page 18: The Smxir Remote Control

    The remote has three buttons that are not used on SMX II systems. The Aux Heat, Aux Heat Auto Switchover, and the Aux 1 buttons are for SMX Net systems only.

  • Page 19: Basic Operation Power On

    Basic Operation Heat Mode Power On Press the HEAT key to select HEAT Mode. The Heat Mode Indicator will light to show that you have selected the heating When AC power is applied to the system at the circuit breaker, mode.

  • Page 20: Using The Humidity Control Routine

    Using The Humidity Programming the SMX II System Control Routine SMX control systems are programmed at the factory for When engaged, the SMX humidity control routine automati- average values. For optimum performance, you may wish to cally turns the air conditioning system on at timed intervals to change these settings to suit your individual preferences.

  • Page 21: Factory Memory Reset

    Factory Memory Reset Setpoint Differential You can use the memory-reset sequence to restore all pro- (Factory Default: 12 = 1.5°) grammed functions to the factory default settings: The setpoint differential is the temperature change needed To restore programmed functions to factory setting: for the cooling or heating functions to cycle on and off.

  • Page 22: Continuous Or Intermittent Fan

    For example, at a line voltage of 120V, Note the blower might reach its fastest speed at 110V. At higher On SMX II systems built before 8/98, press SLOW, FAN and voltages, the bower speed will not increase significantly. FAST simultaneously to adjust fan response differential.

  • Page 23: Humidity Control Program

    • Use the UP or DOWN key to adjust the displayed tem- Programming The perature to the correct value. Dehumidification Time • Press OFF to exit the programming mode. (Factory Default: 30 minutes) The dehumidification time determines how long the com- pressor runs in the dehumidification mode.

  • Page 24: Determining Your Software Version Number

    Note The refrigerant gas (most likely R-22) used in your Cruisair To read version number on SMX II systems built before 8/98, air conditioning system is adequate for the life of the system. press OFF, SET and FAN simultaneously, then COOL twice.
  • Page 25 Problem: Erratic SMX operation Problem: The cooling unit won’t heat Possible Solution: Possible Solution: 1. Perform a Factory Memory Reset. 1. Check that control is in Heat mode, and thermostat is set properly. 2. Check CX/CXP cable and connections. 2. Enable Aux Heat on the SMX control (if a Factory 3.

  • Page 26: Limited Warranty Periods

    Please read and keep this document with your important paperwork. Use it as a reference in the future. If you have any questions, please contact the Dometic Environmental Corporation Service Department at (804)746-1313 for clarification. Note: Any model or replacement part that has been installed due to a warranty failure will carry only the remainder of the original warranty. All warranties begin when the customer takes possession of the equipment.

  • Page 27: Owner's Limited Warranty

    Owner’s Limited Warranty As hereinafter described, Dometic Environmental Corporation limits the duration of any implied warranty to the duration of the underlying express warranty and also disclaims any liability for consequential or incidental damages arising from any application, installation, use or malfunction of any warranted product.
  • Page 28 (electrolysis) of thru-hull components which could result in leakage warranty. However, based on the date the equipment is serious enough to sink a vessel which could result in loss of life. All Dometic components must be kept clean and dry and checked periodically for electrical first put in service, the item may still be covered by the leakage.

  • Page 29: Description Of Figures

    Fig. 17 FM Condensing Unit, Compressor Relay Wiring Fig. 18 EMB & EHMB Cooling Unit Wiring Diagrams Fig. 19 PLHMX-HV Power Logic Box Wiring Diagram Fig. 20 SMX II Control System Wiring Fig. 21 Modulating System Schematic Diagram Fig. 22 Replacement SMX II Parts Fig.
  • Page 30 Fig. 1 Modulating Condensing Unit Fig. 3 Typical Cooling Unit Installation Fig. 2 Typical Cooling Unit Fig. 4 Pump Head Orientation Fig. 5 Seawater Manifolds L-0952...
  • Page 31 Fig. 6 Seawater Piping, Proper System and Common Mistakes Fig. 7 Duct and Grill Sizes Table Unit Min. Return Min. Supply Duct Capacity Air Grill Air Grill Size (Btu/hr) (sq in/cm) (sq in/cm) (in/mm) 4,000 72/465 49/315 5/125 6,000 72/465 49/315 5/125 8,000...
  • Page 32 Fig. 8 Plenum Configurations Fig. 9 Switch Dimensions and Template L-0952...
  • Page 33 Fig. 10 SMXir Mounting Template and Instructions L-0952...
  • Page 34 Fig. 11 Refrigerant Line Sizes Unit or Line Recommended Capacity Line Sizes (Btu/hr) Discharge Suction 4,000 - 12,000 1/4" 3/8" 16,000 1/4" 1/2" 24,000 3/8" 3/4" 42,000 3/8" 3/4" Notes: - Maximum length of refrigerant line between condensing unit and each cooling unit is 50 feet (15m). - Only use seamless refrigeration grade copper tubing - Insulate suction line with minimum 3/8"...
  • Page 35 Fig. 14 FM24C Condensing Unit Wiring Fig. 15 FM42C Condensing Unit Wiring L-0952...
  • Page 36 Fig. 16 FM 3-Phase Condensing Unit Wiring Fig. 17 FM Condensing Unit, Compressor Relay Wiring L-0952...
  • Page 37 Fig. 18 EMB & EHMB Cooling Unit Wiring Diagrams Fig. 19 PLHMX-HV Power Logic Box Wiring Diagram L-0952...
  • Page 38 Fig. 20 SMX II Control System Wiring L-0952...
  • Page 39 Fig. 21 Modulating Systems Schematic Diagram L-0952...
  • Page 40 5103400 Replacement Full Door for SMXIRB, Black 5103400W Replacement Full Door for SMXIRW, White PLHMX-HV SMX II Power/Logic Box or Mod. Systems, 115/230V SMXIIAB SMX II Keypad/Display, Black Snap-on cover for SMX II, Black Snap-on cover for SMX II, Brown...

  • Page 41: Cruisair Worldwide Service Dealer Locator

    Cruisair Worldwide Service Dealer Locator The majority of the service listings displayed for the United States are key members of the national Cruisair distributor or master dealer network. If you need service, please contact the closest company shown. In most cases they will direct you to a local dealer or service port.
  • Page 42 Iowa Mississippi New York Nautical Air, Inc. A.E.R. Supply, Inc. Nautical Air, Inc. Location: Copiague, NY, USA Location: Seabrook, TX, USA Location: Copiague, NY, USA Territory: CT, DE (N. of Sassafras River), IO, IL, MD (N.of Phone: 281-474-3276 Territory: CT, DE (N. of Sassafras River), IO, IL, MD (N.of Baltimore), NJ, NY, PA, OH, RI, Fax: 281-474-2714...
  • Page 43 Fax: 55 (0) 21 2494-7223 Austria E-mail: sailing@sailing.com.br Location: Chesapeake, VA, USA Sailing Products Phone: 757-494-3747 Dometic Marine - Italy, Sales Company Fax: 757-494-3740 Location: Sao Paulo, Brazil Location: Milano, Italy E-mail: lamy.marine@verizon.net Phone: 55 (0) 11 81 1985 Phone:...
  • Page 44 Web: marinemetro@racsa.co.cr Fax: 649-941-5902 E-mail: seannixon@email.com Croatia E-mail: caribmarinediesel@tciway.tc Outfitters International Cay Electronics Ltd. Dometic Marine - Italy, Sales Company Location: St. Georges, Grenada Location: Tortola, British Virgin Islands Location: Milano, Italy Phone: 473-440-7949 Phone: 284-494-2400 Fax: 473-440-6680 Phone: 39 0362 44182...
  • Page 45 Cyprus Germany Italy Dometic Marine - United Kingdom, Sales GEMO GmbH Cummins Diesel Italia S.P.A Company Location: Travemunde, Germany Location: Milan, Italy Location: Poole, Dorset, United Kingdom Phone: 49-4502-2466 Territory: Central & Southern Italy Fax: 49-4502-2425 Phone: 44 870 3306101...
  • Page 46 (511) 451-5052 Scandinavia Location: , St. Maarten/St. Martin, Netherlands Antilles E-mail: frionovo@infonegocio.net.pe Phone: 599 522 9610 (Technical) Dometic Marine - Nordic Sales, Sales Company Philippines Fax: 599 544 3263 Location: Halmstad, Sweden E-mail: paul@frostline.biz (technical); glyn@frostline.biz Tripower Corporation Pte Ltd...
  • Page 47 Location: St. Croix, U.S. Virgin Islands E-mail: gandm@sltnet.lk Phone: 340-773-0289 Sweden Fax: 340-778-8974 E-mail: stcroixmarine@hotmail.com Dometic Marine - Nordic Sales, Sales Company Ukraine Location: Halmstad, Sweden Phone: +46 35 16 57 00 Standarte Fax: +46 35 16 57 10 Location: Starbeevo, Moscow region, Russia E-mail: marine.info@dometic.se...
  • Page 48 Dometic Environmental Corporation P.O. Box 15299 • Richmond, VA 23227-0699 USA Phone: 804-746-1313 • Facsimile: 804-746-7248 Email: sales@cruisair.com • Website: www.cruisair.com For Sales and Service Calls Within Europe and the Middle East, please contact: +44 (0) 870 330 6101 L-0952...

This manual is also suitable for:

Smxir

Table of Contents