Related Manuals for Dometic KRA
Summary of Contents for Dometic KRA
- Page 1 KRA Refrigeration Systems ❖ INSTALLATION • OPERATION Refrigeration Systems Revised: 20190115 L-2091 ❖ English Part Number: LP-17...
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Page 2: Table Of Contents
Dual Box Applications ............6 Quick-Connect Fittings............6 Sight Glass/Moisture Indicator ..........7 Thermostat ................7 Refrigerant Charge ..............7 Refrigeration Systems • Operation KRA Refrigeration Start-Up Check List Thermostat Operation ............8 Servicing Your Refrigeration System Refrigerant ................9 R-134a Tools ................9 Constant Pressure Valve (CPV) ...........9 Thermostatic Expansion Valve (TXV) ........9... -
Page 3: Refrigeration Systems • Introduction
Notice Current Model: Your refrigeration system uses the refrigerant gas 1. The Cabinet Freezer (KRA) comes in an enclosed, painted R-134a. Federal law forbids the intentional release of aluminum box. It is available with a 1/4 HP, 3/8 HP, or the refrigerant gas to the environment. -
Page 4: Refrigerator/Freezer Boxes
Refrigerator/Freezer Boxes The suction line returns refrigerant gas from the evaporator to the condenser and should be fully insulated. The Dometic Applications Department can assist in box design. Box design is very important to the proper operation Liquid Line of a system. A poorly designed and/or built refrigerator/freezer box will result in poor operation of the overall system. -
Page 5: Refrigeration Systems • Installation
90°F/32°C. components. Dometic cannot be held liable for any damages caused by moving the box. Service should be done by trained Any time a condensing unit is installed in an engine room, professional technicians only. -
Page 6: Thermostatic Expansion Valve (Txv) Placement
On systems with two plates, the CPV is connected to the inlet Dual Box Applications side of the fi rst plate, and a jumper line is attached between Use TXVs if two boxes are used in conjunction with one the plates. The suction line then returns to the condensing unit. condenser unit. -
Page 7: Sight Glass/Moisture Indicator
Sight Glass/Moisture Indicator Refrigerant Charge On the condensing units, there is a sight glass located directly All Systems inside the front cover. This glass will communicate many The system is relatively charge insensitive due to the large things about the system’s operating condition. receiver that allows the condensing unit to be charged with enough refrigerant to handle most normal plate and line con- 1. -
Page 8: Refrigeration Systems • Operation
This section of the manual refers to essential safe operation for 5. Check the sight glass to make sure the element inside all KRA refrigeration systems. For any operational problems call is green (no moisture contamination.) your dealer, or call our service department at 804-746-1313. -
Page 9: Servicing Your Refrigeration System Refrigerant
Disconnect the QCs, and pressur- the gauge connections. They help ensure that only R-134a ize all parts separately. Use of the Dometic part A-134VB will tools are used. If you need a gauge set to fi t the connections, allow you to connect your gauges to the QCs on the linesets contact your dealer and ask for part A-134A. -
Page 10: Charging The System
2. Evacuate system per governing EPA regulations. 3. Make sure the valve is dry, and replace cap on constant pressure valve, being careful not to disturb the setting. 3. With the manifold gauges still connected to service ports, Insulate valve with foam tape. On the WAAF033T unit, top attach the center line of gauge set to vacuum pump. -
Page 11: Setting The Thermostat
Setting the Thermostat User Maintenance After the constant pressure valve is set, the condensing unit thermostat needs to be set. The set point temperature should Seawater System be adjusted as stated in the section “Constant Pressure Valve (CPV) and Linesets”. Check the seawater strainer daily. - Page 12 UV dye system that ting. Ensure the correct voltage at thermostat. is built into the KRA Refrigeration System or by If the thermostat is showing a fault code, refer to using an electronic leak detector.
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Page 13: Btu Guide - Refrigeration Loss/Gain Specs
9. High condensing temperature. BTU Guide - Refrigeration Loss/Gain High ambient temperature – introduce cooler air into Specs compartment that houses the condensing unit. High water temperature – while you cannot remedy BTU loss per hour for various capacity boxes at 100°F this problem, you can help by introducing cooler air difference between inside and outside temperature. - Page 14 Capacity (in BTU/Hr) Compressor Evaporating Air/Water Air Cooled Horsepower Pressure Cooled Only 1/4HP 2 psi 1495 1170 12 psi 2440 1880 3/8HP 2 psi 1980 1545 12 psi 3230 2485 1/2HP 2 psi 2405 1860 12 psi 4165 3425 Condensing unit BTU extraction capacities at normal operating conditions with air and water condensing enabled, and a -10°F evaporating surface.
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Page 15: Description Of Figures
Description of Figures Fig. 1 Cabinet Type Condensing Unit – Model KRA Fig. 2 Flat Plate Evaporators Fig. 3 Wrapped Box Evaporator Fig. 4 Flat Evaporator Plate Designs Fig. 5 Digital Thermostat Settings – Model ETC Fig. 6 Refrigeration Tools and Technicians Accessories Fig. - Page 16 Fig 1. Cabinet Type Condensing Unit (KRA) Fig 3. Wrapped Box Evaporator Fig 2. Flat Plate Evaporators Fig 4. Flat Plate Evaporator Designs ❖ L-2091 Drawings/Diagrams English...
- Page 17 Fig. 5 Digital Thermostat Settings – Model ETC Fig. 6 Refrigeration Tools and Technicians Accessories Part Description Model Description R-134a gauge set with Quick Couplings A-134A Gauge Set R-134A Adaptor between gauge set and quick connects for charging A-134VB Charging Assembly - Gauge Set to New QCs Mounting kit to set a freezer plate off the box wall A-135 Mounting Kit-Refrigeration Plate Offset...
- Page 18 Fig. 7a Wiring Diagram # 080336 – KRA025 and KRA038 Units (115VAC) ❖ L-2091 Drawings/Diagrams English...
- Page 19 Fig. 7b Wiring Diagram # 080337 – KRA025CK and 038CK Units (230/50) ❖ L-2091 Drawings/Diagrams English...
- Page 20 Fig. 8a Wiring Diagram # 080334 – KRA050 Unit (115VAC) ❖ L-2091 Drawings/Diagrams English...
- Page 21 Fig. 8b Wiring Diagram # 080387 – KRA050 Unit (230/50) ❖ L-2091 Drawings/Diagrams English...
- Page 22 Fig. 9 Wiring Diagram # 080319 – Dual Stage Refrigerator/Freezer (1 T-Stat, 2 Setpoints) ❖ L-2091 Drawings/Diagrams English...
- Page 23 Fig. 10 Wiring Diagram # 080321 – Dual/Single Refrigeration Installation (2 T-Stats) ❖ L-2091 Drawings/Diagrams English...
- Page 24 Fig. 11 Wiring Diagram # 080317 – KR025 and 038 Units (Older 115VAC models) ❖ L-2091 Drawings/Diagrams English...
- Page 25 Fig. 12 Wiring Diagram # 080318 – KR025C and 038C Units (Older 230VAC models) ❖ L-2091 Drawings/Diagrams English...
- Page 26 Fig. 13 Typical Installation – Single Plate ❖ L-2091 Drawings/Diagrams English...
- Page 27 Fig. 14 Typical Installation – Dual Plates with Jumper ❖ L-2091 Drawings/Diagrams English...
- Page 28 Fig. 15 Typical Installation – Dual Boxes with “Y” Splitters ❖ L-2091 Drawings/Diagrams English...
- Page 29 REFRIGERANT at TEMPERATURE °F Fig. 16 Refrigerant Pressure-Temperature Chart green blue orange lt brown brown pink light green PSIG HP62 or FX-56 or 134a 407C 410A 417A 404A 409A Dew Bubble * Inches mercury below one atmosphere Note: Fold card at blank lines, back-n-forth like an accordion. ❖...
- Page 30 NOTES...
- Page 31 NOTES...
- Page 32 DOMETIC MARINE DIVISION 2000 N. Andrews Ave. Pompano Beach, FL 33069 USA +1 954-973-2477 +1 954-979-4414 Email MarineSales@dometic.com 24/7 TECH SUPPORT FOR UNITED STATES AND CANADA 8:00 AM to 5:00 PM Eastern Time: +1 800-542-2477 After hours and weekends: +1 888-440-4494...