DX Built-In Air Cooled A/C Systems v INSTALLATION • OPERATION 2 Distributed By: P.O. Box 430 Milford, VA 22514 Phone (804) 633-9454 FAX (804) 633-5499 DIRECT EXPANSION SYSTEMS Dometic Corporation 2000 N. Andrews Ave. Ext. • Pompano Beach, FL 33069-1497 USA Phone: 954-973-2477 • Fax: 954-979-4414 Website: www.dometic.com/marine • Email: sales@dometicusa.
WARNING This manual contains essential safety information concerning the safe and proper installation of Cruisair direct expansion air conditioning systems. It is very important that you read and understand the contents of this manual thoroughly before attempting to install any Cruisair equipment. If there are any statements in this manual that you do not understand, contact the Dometic Applications Department for assistance. Phone 954-973-2477, Fax 954979-4414 (8:00 am - 5:00 pm United States EST).
Table of Contents Chapter 1: Description of Basic Components............................................................................................4 Basic Principles...............................................................................................................................4 Cooling Unit.....................................................................................................................................4 Controls/Switches.................................................
CHAPTER 1: Description of Basic Components Basic Principles SA type switch assembly has rotary knobs for controlling the system. Figure 1 shows a typical SA switch assembly. The Cruisair air conditioning system consists of three basic components and, in some cases, several accessory parts. They are: (1) cooling unit; (2) control or switch assembly; and (3) condensing unit.
CHAPTER 2: Installation Of Basic Components Centrifugal or blower type cooling units, model number prefixes EBS, EBO, EHBO, EBL or EHBL, should be mounted low, near the return air grill, and the discharge air ducted to the discharge grill mounted at a high level. The following instructions should be followed, in their proper sequence, when installing Cruisair equipment. Read and understand the instructions in this manual before proceeding.
Condensing Unit can be removed and cleaned easily. The filter material should be a type which will not cause a significant inlet air flow pressure drop. For all discharge air applications, wood or plastic frames are recommended. Aluminum frame grills will become cold and may produce secondary condensation that will drip from the grill frame. Cruisair condensing units are designed to be installed in a compartment ventilated to the outside.
Installation Kit 1. Copper Tubing When installing the two connecting copper tubes between the cooling unit and the condensing unit, there are several important factors to consider. First, the tubing can be run in lengths up to 50 feet. It can run uphill, downhill, or sloping, as required and can have as many bends as necessary. (Avoid sharp bends and do not use soldered elbows.
Air Conditioning System with (1) Cooling Unit & (1) Condensing Unit Air Conditioning System with (2) Cooling Units & (1) Condensing Unit Cooling Unit Line Sizes Suction Lines Unit Cap 14000 BTU 16000 BTU - Unit Cap Line Size 4000 BTU 7000 BTU 10000 BTU - 1/2” 1/2” Discharge Lines 14000 BTU 16000 BTU - Suction Discharge 3/8” 3/8” 3/8” 1/4” 1/4” 1/4” Condensing Unit Line Sizes 1/4” 1/4” 14000 BTU - 1/2” Discharge Tee 1/4” X 1/4” X 1/4” Suction Line Suction Tee 3/8” X 3/8” X 1/2” Notes: D
CHAPTER 3: Start Up Procedures - Final Inspection The following is a list of items to be checked before any Cruisair system is started. Be sure that the: 14,000 BTU/hr Condensing Unit Voltage Wire size Breaker size p Cooling unit is bolted securely in place. p Cooling unit return air cross sectional open area is equal to the face area of the unit evaporator coil as a minimum 115 10 30 230 12 20 Figure 6.
CHAPTER 4: Start Up Procedures - Initial Charging Of A New System pressure gauge hose, equipped with self closing fittings to the red capped port. At this point do not connect the high pressure charging hose to anything. 4. Close all gauge manifold valves. 5. Energize the vacuum pump and open manifold valves for the vacuum pump, the refrigerant container, and the red capped access port low pressure test gauge). 6. As the pump operates, you will see the low pressure test gauge fall to a vacuum.
Field Charging A System* 6. Start the unit and observe the system pressures. Use the Cruisair charging pressure charts, Figure 7a or 7b to determine the proper pressures. These charts are to be used as a guide to setting pressures. They are not designed to give exact pressure settings. There are conditions that may cause pressures to vary. Head pressures may vary ± 10%. Suction Pressure settings are more critical (± 5%) for functioning of the system.
Cooling Cycle Equipment Built in 1994 and After IMPORTANT To determine desired pressures, exact inside and outside temperatures must be measured. 80 75 70 65 Indoor Temp. 90 (F°) 60 80 Suction Pressure (PSIG) 55 70 50 60 65 70 75 80 85 90 95 100 105 110 115 120 45 Outdoor Air (F°) 400 375 350 325 300 Indoor Temp. (F°) 275 250 225 90 80 70 60 200 65 70 75 80 85 90 95 100 Outdoor Air (F°) Figure 7a.
Cooling Cycle Equipment Built Prior To 1994 IMPORTANT To determine desired pressures, exact inside and outside temperatures must be measured. 120 110 100 90 p. Indoor Temp. (F°) em ir T A 0° 9 ° 80 90 Air Te 70 . mp e ir T 7 80 80 . mp A 0° 60 p. em ir T 50 A 0° 6 70 40 50 60 Suction Pressure (PSIG) 70 80 90 Outdoor Air (F°) 400 90° Indoor Temp. (F°) 90 Air 80 Te . p em ir T 80° A 70° A 60° 350 . mp . p em ir T Air .
CHAPTER 5: Start Up Procedures - Final Check-Out and Start-Up difference the two readings should be 15 to 20 degrees Fahrenheit. Note that humidity will diminish the temperature differential and cooling capacity. Cooling capacity diminishes in very warm outside, air (above 95° F / 35° C), and heating capacity decreases when outside air temperature drops below 40° F / 4° C. p Actuate the circuit breaker for the air conditioning.
CHAPTER 6: General Operation Operating Instructions: Rotary Knobs Setting Desired Temperature To set the thermostat, allow the unit to operate until the living area is cooled or heated to the desired temperature. At this point, turn the thermostat (WARMER/COOLER) knob slowly toward the center position until you hear it “click” once. The thermostat is now set to maintain the desired temperature.
Operating Instructions: SMX Series Controls Selecting the Cooling or Heating Mode Select the cooling or heating mode by pressing either the COOL or HEAT key. The small LED above the key will light up to show whether the system is in the cooling or heating mode. For automatic changeover between cooling and heating, press the COOL and HEAT keys simultaneously, and both LED’s will light.
CHAPTER 7: Maintenance Cooling Unit and Switch Assembly Warning • • • • • • • • • • • • • Switch contacts are self-cleaning and require no maintenance. At the beginning of each trip, check the cooling unit condensate drains for total or partial obstruction by pouring two quarts of water rapidly into the condensate drip tray. It should drain completely within 30 seconds. When the cooling unit was installed initially, a filter should have been installed in the return air path.
CHAPTER 8: System Failure Troubleshooting Guide Trouble Probable Cause Symptoms Remedy Compressor fails to start Power source failure No current at power source Check for tripped circuit breaker Faulty switch assembly No current at condensing Check for faulty unit terminal strip switch Low voltage Compressor tries to start & Correct power then cuts off source Faulty high pressure Voltage to switch but no Replace high switch voltage between the switch pressure
CHAPTER 9: System Charging Troubleshooting Guide Pressures Suction/Discharge Normal Normal Symptoms Possible Cause Suction line sweating w/droplets up to compressor Proper charged system Compressor warm on top & hot on bottom Temp differential across cooling coil is 16-20° F Low Low Suction line cool, not sweating Low on charge Compressor hot on top and bottom Cooling coil temp.
CHAPTER 10: Installation Wiring Diagrams Index of Diagrams • Cooling Only Systems Built and Installed Through 1989 For: Condensing Units: ACA-14 Series Controls: SA1 Series Switch Assembly............................................................................................... 21 • SKB-208 Cooling Only Systems Built and Installed From 1989 Through June 1996 For: Condensing Units: ACA-14U & ACA-14BU Controls: SA1 Series Switch Assembly..............................................................
Cooling Only Systems Built and Installed Through 1989 SA1-ZB10 Switch Assembly To AC Power Panel 115V 60Hz-1Ø Condensing Unit ACA-14 Series Ground Lug Cooling Unit Condensate Drain Typical Wiring Diagram: (1) Condensing Unit & (1) Cooling Unit To AC Power Panel 115V 60Hz-1Ø SA1-ZB10 Switch Assembly Cooling Unit Condensing Unit ACA-14 Series Cooling Unit Switch Assembly Typical Wiring Diagram: (1) Condensing Unit & (2) Cooling Units 21
For Condensing Units: ACA-14U, ACA-14BU Controls: SA1 Series Switch Assembly SKB-208 Cooling Only Systems Built and Installed From 1989 - June 1996
SKB-208A For Condensing Units: ACA-14U, ACA-14BU, ACA-14BS, & ACA-14HBS Controls: SA1 Series Switch Assembly Cooling Only Systems Built and Installed From 1989 - Current Production
For Condensing Units: ACA-14U, ACA-14BU, ACA-14BS, & ACA-14HBS Cooling Units: EHBO & EHBL Series w/Built in Heaters Controls: SA13 Series Switch Assembly SKB-690 Cooling w/Auxiliary Electric Heating Systems Built and Installed From 1996 - Current Production
P-485 For Condensing Units: ACAH-14B & ACAH-14BU Controls: SA3 Series Switch Assembly No.
For: Condensing Units: ACH-14B, ACH-14BU, & ACH-14HB Controls: SA3 Series Switch Assembly **Wiring Changes Required** When System is Controlled by SA3-Z Series No.
P-572 For Condensing Units: ACH-14B, ACH-14BU, & ACH-14HB Controls: SMXII Series Micro-processor No.
P-782 For Condensing Units: ACH-14B, ACH-14BU& ACH-14HB Cooling Units: EHBO & EHBL Series w/Built in Heaters Controls: SMX OnLine Series No.
P-783 No.
Notes 30
WARNING Dometic Corp., manufacturer of Cruisair, Grunert, Marine Air and Sentry Products, makes the following safety warnings concerning the application, installation, use and care of its products. Although these warnings are extensive, there may be specific hazards which may arise out of circumstances which we have not outlined herein. Use this as a guide for developing an awareness of potential hazards of all kinds. Such an awareness will be a key factor in assuring your SAFETY and comfort.
2000 N. Andrews Ave. Ext. • Pompano Beach, FL 33069-1497 USA Phone: 954-973-2477 • Fax: 954-979-4414 Website: www.dometic.com/marine • Email: sales@dometicusa.
