Fieldpiece Refrigerant Recovery Machine OPERATOR'S MANUAL Model MR45
Contents Important Notice . . What’s Included . Warnings . . . . . . . . . . . . . . . . . 4 . . 4 Certifications . . . . . . . 5 Description . Features . . . . . . . 6 Specifications . . . . . . . 8 Safety Information . . . . . First Aid for Refrigerant Exposure General Environmental Personal Protection MR45 Protection Setup Operational Tech Tips . . General Setup Operational 2 4 . . . . . .
Important Notice This is not a consumer machine. Only qualified personnel trained in the recovery or pumping of refrigerant may operate this machine. Read and understand this operator’s manual in its entirety before using MR45 to prevent injury or damage to you or equipment.
Description The MR45 is the first variable speed DC motor machine with a digital display. Pump refrigerant easier and quieter than ever before. Connect your hoses without navigating around dark tight spaces or picking the pump off the ground. View status messages and pressures directly on the big bright display. Carry the machine to and from the job site easily and well protected from environmental hazards.
Specifications Display: 2 x 10000 count LCD with status messages Input Port Filtration: 11 mm mesh screen, stainless Backlight: Blue color Dimensions: 14.8” x 9.8” x 13.5” 376 mm x 250 mm x 344 mm Measurement rate: 3.3 times per second, nominal Input Port Pressure Sensor Range: -30” Hg to 600 psig Output Port Pressure Sensor Range: -30” Hg to 600 psig High Pressure Cutoff: 558 psig, nominal Resolution and Units: 1 psig (1” Hg), 0.05 bar (2 cmHg), 0.
Safety Information First Aid for Refrigerant Exposure Inhaled: Eye: Skin: Move to fresh air immediately. Immediately flush eye with water. Seek medical attention. Immediately flush skin with water. Seek medical attention. General 1. 2. This is not a consumer machine. Only qualified personnel trained in the recovery or pumping of refrigerant may operate this machine. Read and understand this operator’s manual in its entirety before using MR45 to prevent injury or damage to you or equipment.
Tech Tips General 1. 2. 3. 4. 5. Store in the self purge or recover position. Do not store in the CLOSED position as trapped air and refrigerant can expand and damage components. For extended storage, purge with nitrogen, set to RECOVER, and cap (do not seal) the ports. Recovery machines are not vacuum pumps and should not be used for deep evacuations. Do not run the machine without the mesh screen filter (page 32). Doing so will void the warranty and damage the machine.
Controls Port Routing Control Knob Power Cord Storage Mesh Screen Filter Input Port Backlit Digital Dual Display and Buttons Output Port 14 15
Display and Buttons Input Pressure Status Icons and Messages Output Pressure The icon rotates when the motor is running. The icon is shown when MR45 is set to MUTE. OK TO START Motor stopped. Temperatures, voltages, and pressures are currently safe to start the motor again. COMPLETE Purge or recovery has reached final recovery vacuum. Input Closed Cannot zero pressures. Open input port. Status Icons and Messages Output Closed Cannot zero pressures. Open output port.
Port Routing Control RECOVER • Input and Output fully open. • Set to this fully open position for most of the recovery process. CLOSED OR • Input and Output closed. • Set to either closed position to close off both ports during setup. OR OR RECOVER (throttled) OR SELF PURGE • Input closed, Output open. • Set to this position to close the IN port before you START the purge. 18 • Input and Output partially open.
MR45 Refrigerant Flow Refrigerant liquid and vapor are pulled through the machine by the pressure difference created by the compressor. For maximum performance, increase the IN pressure and reduce the OUT pressure. See Tech Tips (page 12). Manifold (knob control) Compressor Condenser (microchannel) Input Pressure Sensor MR45 pressure readings are designed only for monitoring pressures. Do not use MR45 for diagnostic pressure measurements.
Functions MR45 Self Test Perform this test to ensure the high pressure cutoff and pump are operational. 1. 2. 3. 4. 5. 6. Set knob to RECOVERY. Open IN port to air. Connect a ball valve to OUT port. Close the ball valve. Press START to create a pressure at the OUT port. MR45 is working well if High Pressure Cutoff occurs around 550 psig within 45 seconds. Cutoff time can increase if a hose is placed in front of your ball valve.
Direct Liquid/Vapor Recovery Cylinder L V This is the typical recovery method. Vapor and liquid lines are routed through your manifold, into MR45, and out to the recovery cylinder. 1. 2. 3. 4. 5. 6. Filter (optional) Manifold Close valves of recovery cylinder, MR45, and manifold. Set up as shown in the diagram. Open valves of hoses and removal tools. Set MR45 to RECOVER. Open high side of manifold for liquid recovery.
( Push/Pull Recovery Cylinder L V This method is only for larger systems with at least 30 lbs of liquid refrigerant. It’s used to recover liquid before recovering vapor. 1. 2. 3. 4. Close valves of recovery cylinder and MR45. Set up as shown in the diagram. Open valves of liquid hose and removal tool at liquid system port. To purge air from system liquid hose, briefly unseat hose fitting at cylinder’s liquid port until vapor is seen. 5.
Enhanced Direct Liquid Recovery Cylinder L V This method reduces the vapor pressure in the cylinder for faster liquid recovery. Vapor recovery is slowed however because vapor is recovered only through the liquid port of the system. 1. 2. 3. 4. 5. Close valves of recovery cylinder. Set up as shown in the diagram. Open valves of hoses and removal tools. Set MR45 to RECOVER. To purge air from hoses, briefly unseat both hose fittings at cylinder until vapor is seen. 6.
Troubleshooting Motor Fault 2 Input Closed Motor current (amps) rose above operating range. Motor stopped. Extremely high ambient temperature, extended liquid recovery time, or high cylinder pressure can be the cause. Allow time for the motor to cool down before resuming, and throttle the RECOVERY (page 19). Output Closed Motor stopped for unknown reason. If this occurs repeatedly, there may be something wrong with MR45.
Maintenance 1. Wipe with damp cloth to clean the exterior. Do not use solvents. 2. To extend the life of internal seals, occasionally pump a teaspoon of mineral oil through MR45. 3. When the mesh screen filter becomes dirty and clogged, it means it’s working to keep your MR45 working well. You need to clean or replace this screen often. 1. Loosen securing hex nut. (Re-tighten with 1/8 wrench turn) 2.
MR45 © Fieldpiece Instruments, Inc 2017; v16
