McQuay RRU570, RRU570-3 Installation Manual

Installation, Operation & Maintenance Manual

Refrigerant Recovery Unit, Model RRU570

IOMM RRU570

Group: Refrigerant Effective: December 2000

Supersedes: New

Table of Contents

Specifications...........................................................................................................................3

Product Description.................................................................................................................4

Procedures for Evacuating......................................................................................................5

Procedures for Liquid Push/Pull Method...............................................................................7

Procedures for Vapor Recovery Mode..................................................................................8

Refrigerant Clearing Procedures.........................................................................................10

Changing Recovery Compressor Oil...................................................................................10

Electrical Parts Breakdown..................................................................................................12

Replacement Parts List........................................................................................................15

Troubleshooting.....................................................................................................................17

"McQuay" is a registered trademark of McQuay International

"Illustrations cover the general appearance of McQuay International products at the time of publication and we reserve the right to make

changes in design and construction at anytime without notice."

2 IOMM RRU570



1997 McQuay International

Specifications

Electrical Power Requirements

Recovery Main Components and Controls

115Vac, 50/60 Hz, 1-Phase, 20-Amperes Min Ckt 15.0 Amp, Max Fuse 20 Amps

Model RRU570-3 Compressor 220/240Vac

50/60Hz, 1 Phase Min Ckt 20.0 Amp, Max Fuse 30 Amps

Model RRU570-V Compressor 230 Vac

50/60Hz, 3 Phase Min Ckt 10.0 Amp, Max Fuse 20 Amps

Model RRU570-R Compressor 460 Vac

50/60Hz, 1 Phase Min Ckt 10.0 Amp, Max Fuse 15 Amps

Model RRU570-D Compressor 575 Vac

50/60Hz, 1 Phase Min Ckt 10.0 Amp, Max Fuse 15 Amps

Dimensions (approximate): 42 in. high x 24 in. wide x 22 in. deep Weight: 240-lbs. (340-lbs. shipping)

Furnished with RRU570

One- 48 cu. in. drier core 80% tank float cable Two-10 ft. ¾ in. hoses with isolation valves One-20 ft. ¾ in. hoses with isolation valves

NOTICE

McQuay International urges that all HVAC servicers working on McQuay equipment or any

manufacturer’s products, make every effort to eliminate, if possible, or vigorously reduce the

emission of CFC, HCFC, and HFC refrigerants to the atmosphere resulting from installation,

operation, routine maintenance, or major service of this equipment. Always act in a

responsible manner to conserve refrigerants for continued use even when acceptable

alternatives are available. Conservation and emission reduction can be accomplished by

following recommended service and safety procedures.

WARNING

To avoid injury or death due to inhalation of, or skin exposure to refrigerant, closely follow

all safety procedures described in the Material Safety Data Sheet for the refrigerant and to

all labels on refrigerant containers. Certain procedures common to refrigeration system

service may expose personnel to liquid or vaporous refrigerant.

IOMM RRU570 3

Product Description

McQuay’s RRU570 recovery system provides efficient and safe recovery of most positive-pressure refrigerants.

The unit consists of a 3 or 5-hp open drive compressor, high capacity 1200 cfm air-cooled condenser, system pressure gauge, tank pressure gauge, a valving system consisting of one manually operated 3-way valve, oil return valve and one 2-way evacuation valve. Unit connections are ¾ in. male flare with isolation valves. After hoses are connected and evacuated, user simply configures hoses for liquid push/pull mode, opens all lines at A/C System and recovery tank, and turns RRU570 on. RRU570 then starts recovery by letting refrigerant migrate from the A/C system to the recovery tank. It then draws vapor off the recovery tank, lowering tank vapor pressure, heats vapor and increases pressure via compression, and injects it back into the A/C system condenser, thus creating a pressure differential for a push/pull liquid transfer.

Two onboard gauges display A/C system pressure and recovery tank pressure. When the liquid has finished transferring and sight glass on liquid line indicates liquid refrigerant has been transferred, the user simply reconfigures the hoses to vapor recovery mode, allowing the RRU570 to pull vapor from A/C system evaporator being recovered. The RRU570 compressor begins recovering vapor which is first cleaned by a 48 cu inch filter drier. The discharged hot compressed refrigerant passes through an oil separator where the oil is extracted and returned to the compressor. Refrigerant is then condensed by the air-cooled condenser and sent to the recovery tank.

The transfer stops when an internal pressure switch indicates the A/C system is under a 15 in. Hg vacuum. If pressure should again rise above 0 psig, the RRU570 will restart to pull the refrigerant from the A/C system until a 15 in. Hg vacuum is restored.

Safe Operations and Tips

To ensure your safety as well as others, before attempting to recover a A/C system, proper and thorough preparation must take place.

Make sure you have a recovery tank with a minimum ¾ in. male flare vapor port and a minimum ¾ in. male flare liquid port, or larger ports if possible. This tank or series of tanks must be able to hold the entire refrigerant charge at 80% full and also must be pressure rated for the specific refrigerant being recovered.

Note: Refrigerant full weight is 80% of water capacity weight determined as follows: Maximum allowable gross weight = 80% of water capacity weight + tank tare weight.

In addition, a suitable scale should be used to weigh the refrigerant charge to prevent overfilling tanks in case the RRU570 needs to be shut down. If a scale is not available, the tanks can be equipped at the time of purchase with a float switch that will deactivate the RRU570’s 120-Vac control circuit. All RRU570 units come with a safety float connection and bypass switch.

Finally, the recovery tank or tanks must be pulled into a 29 in. Hg vacuum before recovery commences. Failure to follow these above stated procedures will decrease the likelihood of the RRU570 performing at its highest possible effectiveness.

Peak Performance

To get the highest performance from your RRU570 unit, we recommend that you connect to ¾ in. evaporator and ¾ in. condenser ports on the A/C system and to recovery tanks with ¾ in. ports whenever possible.

4 IOMM RRU570

Procedures for Evacuating

NOTE: Close the oil return valve between oil separator and compressor before evacuating

refrigerant lines and the RRU570.

1. Turn the A/C system off and make sure that the chiller cannot restart.

2. When using 230-Vac 1-phase power connect the 50-ft 230/460-Vac 1-phase power cord to a

minimum 20 amp, maximum 30 amp circuit breaker or fused disconnect and plug the quick connect Hubbell into the RRU570’s control box. When using a 460-Vac 1-phase power connect the 50-ft 230/460-Vac 1-phase power cord to a minimum 10 amp, maximum 20 amp circuit breaker or fused disconnect and plug the quick connect Hubbell into the RRU570’s control box. Connect the 100-ft 120-Vac 1-phase power cord for controls. At this time, switch the voltage selector switch to desired 1-phase voltage 230 or 460. Failure to select proper voltage will result in major damage to the compressor motor. All other models connect to proper voltage and required amperage as rated on the equipment label.

3. Connect the three high-pressure refrigerant hoses, as shown in Figure 1. At this time, connect

the safety float cable from the RRU570 to recovery tank or use a suitable scale. If a scale is to be used instead of a float safety cutout, the 80% full bypass switch will need to be set to the “On” position for the RRU570 to run.

4. Open isolation valves on top of the RRU570 recovery unit Figure 1 (A).

5. Turn the 3-way valve located on the front of unit RRU570 MODE, as shown in Figure 1 (B).

6. Turn the RRU570 power switch on, the RRU570 will start evacuating recovery tank vapor side

hose. The RRU570 will pull hose into a 15 in. vacuum, then automatically shut down. After the RRU570 shuts down, proceed to next step.

7. Turn the 2-way EVACUATION BYPASS VALVE located on the side of the RRU570 to OPEN

POSITION, as shown in Figure 1 (C). Once the RRU570 restarts, the discharge hose from the RRU570 to the A/C system condenser will be pulled into a 15 in. vacuum, then the RRU570 will automatically shut down. After the RRU570 shuts down, proceed to next step.

8. Return the 3-way valve on front of unit to NORMAL OPERATION as shown in Figure 1 (D)

and turn the 2-way EVACUATION BYPASS VALVE located on side of the RRU570 to the CLOSED POSITION, as shown in Figure 1 (E). Open the oil return valve between oil separator and compressor. Now proceed to the Liquid Push/Pull method on page 7.

IOMM RRU570 5

Figure 1, Evacuating Hoses and Liquid Push/Pull

(B)

(D)

( C)

(A)

(E)

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