McQuay RRU134 Installation Manual
Installation, Operation & Maintenance Manual
Refrigerant Recovery Unit, Model RRU134
IOMM RRU134
Group: Refrigerant
Effective: December 2000
Supersedes: New
© 1999 McQuay International
Table of Contents
Specifications...........................................................................................................................3
Product Description.................................................................................................................4
Procedures for Liquid Push Pull Method...............................................................................5
Refrigerant Clearing Procedures...........................................................................................7
Changing Compressor Oil.......................................................................................................8
Electrical Parts Breakdown..................................................................................................11
Replacement Parts List........................................................................................................13
Troubleshooting.....................................................................................................................14
"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 RRU134
1997 McQuay International
Specifications
Electrical Power Requirements
Recovery Main Components and Controls
115 Vac, 50/60 Hz, 1-Phase, 20-Amps
Minimum Circuit Amp 17.5, Maximum Fuse 20 Amps
240Vac, 50/60Hz, 1-Phase, 15-Amps
Minimum Circuit Amp 10.0, Maximum Fuse 15 Amps
Dimensions (approximate): 19 in. high x 14 in. wide x 18 in. deep
Weight: 100-lbs. (130-lbs. shipping)
Furnished with RRU134
Two ½ in. Female Flare Unions
Two 0.73-Litre Disposable In-line Filter Driers
Cable for 80% Full Safety Switch
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 RRU134 3
Product Description
McQuay’s RRU134 recovery system provides the efficient and safe recovery of most positivepressure refrigerants and blends.
The unit consists of a 1.5-hp open drive compressor, high capacity 700 cfm air-cooled condenser,
system pressure gauge, tank pressure gauge and a valving system consisting of three manually
operated 3-way valves. Unit connections are ½ in. male flare with isolation valves. After four hoses
are connected and purged or evacuated, the user simply turns three 3-way valves to the liquid mode
position, opens all lines at the system being recovered, purges lines and turns the RRU134 on. The
RRU134 starts recovery by letting refrigerant migrate from the A/C system to the recovery tank. It
then draws vapor off the recovery tank, heats it via compression, and injects it back into the A/C
system high side, thus creating a pressure differential for a push/pull liquid transfer.
Two onboard gauges display system pressure and recovery tank pressure. When liquid has finished
transferring and the sight glass on side of the RRU134 is clear of liquid refrigerant, the user turns all
three 3-way valves to vapor recovery mode, allowing the RRU134 to pull vapor from both sides of
the A/C system being recovered. The RRU134 compressor begins recovering vapor which is first
cleansed by an external filter drier. The discharged hot refrigerant gas is then condensed by the aircooled condenser and sent to the recovery tank as a liquid.
Transfer stops when an internal pressure switch indicates that the A/C system is under a 15 in.
vacuum. If pressure should again rise above 0 psig, the RRU134 will restart to pull all remaining gas
from the A/C system.
Safe Operations and Tips
To ensure your safety as well as others, before attempting to recover an A/C or refrigeration system,
proper and thorough preparation must take place.
Make sure that you have a recovery cylinder with a minimum ½ in. male flare vapor port and a
minimum ½ in. male flare liquid port with ½ in. internal dip tube, or larger ports if possible. This tank or
series of tanks must be able to hold the entire refrigerant charge at 80 % full.
Reminder: Refrigerant full weight is 80% of water capacity weight determined as follows:
Maximum allowable gross weight = 80% of water capacity weight + cylinder tare weight.
In addition, a suitable scale should be used to weigh the refrigerant charge in case RRU134 needs to
be shut down to prevent overfilling the tanks. If a scale is not available, the tanks can be equipped at
time of purchase with a float switch that will deactivate the RRU134’s 120-VAC control circuit. All
RRU134 units come with safety float connection and cable.
Finally, the recovery cylinder or cylinders must be pulled into a 29 in. vacuum before recovery
commences. Failure to follow these above stated procedures will decrease the likelihood of the
RRU134 performing at its highest possible effectiveness.
Peak Performance
To get the highest performance from your RRU134 unit, we recommend that you connect to ½ in.
evaporator and ½ in. condenser ports on the A/C system and to recovery cylinders with ½ in. ports
and dip tubes whenever possible.
4 IOMM RRU134
Procedures for Liquid Push Pull Method
1. Turn the refrigeration or A/C system off; make sure that the system cannot restart.
2. Connect the 120-VAC power cord to the RRU134’s control box and a 120-VAC 1-phase
minimum 17.5 amp maximum 20-amp outlet.
3. Connect all refrigerant hoses, as shown in Figure 1. Connect two ½ in. hoses to the RRU134’S
recovery tank side liquid and vapor ports and to liquid and vapor ports on the recovery cylinder.
Connect the other two ½ in. hoses to ports on the A/C system or refrigeration unit evaporator
and condenser as well as on the RRU134 system liquid and vapor ports. At this time connect
safety float cable from the RRU134 to recovery tank or use a suitable scale. If a scale is to be
used instead of float safety cut out, the 80% full bypass switch will need to be set to the “on”
position for the RRU134 to run.
4. Turn all three 3-way valves on the RRU134 to LIQUID MODE.
5. Open vapor and liquid access valves on A/C system being recovered.
6. Next open system vapor and liquid hand valves on the RRU134 recovery unit.
7. Next open tank vapor and liquid valves on the RRU134 recovery unit.
8. Turn upper left hand three way valve to PURGE MODE.
9. Purge both refrigerant lines at recovery tank, then turn upper left hand three way valve back to
LIQUID MODE.
10. Next open vapor and liquid hand valves on the recovery tank.
11. Turn the RRU134 power switch on and the RRU134 will automatically start drawing vapor off
of recovery tank and forcing higher compressed gas back into the condenser of the A/C
system. Liquid push/pull is now in process.
12. Continue to monitor the liquid sight glass on side of the RRU134. Once all of the liquid has
been completely removed and you are absolutely sure that all of the liquid has been removed,
proceed to next section.
WARNING
It is absolutely imperative that all of the liquid has been removed before switching into the
vapor recovery mode. Failure to do so may result in liquid slugging to the compressor and
causing major damage to the compressor.
Vapor Recovery Method
13. Once liquid site glass is completely clear of all liquid, turn all three, 3-way valves to VAPOR
RECOVERY MODE as shown in Figure 1. The RRU134 will now recover all of the
remaining gas and vapor from both sides of the A/C system and pull entire system into a 15 in.
vacuum.
14. Once the A/C system has been completely recovered to a 15 in. vacuum, the RRU134 will shut
down and “recovery complete” light will illuminate. Should pressure in the the A/C system
again rise above 0 psig, the RRU134 will restart and pull A/C system back into a 15 in. vacuum.
15. When recovery is finished, close both condenser and evaporator isolation valves on the A/C
system as well as the system vapor and liquid isolation valves on the RRU134 recovery unit.
To clear remaining refrigerant from the recovery tank hoses and RRU134 recovery unit,
proceed to the REFRIGERANT CLEARING PROCEDURES on page 7.
IOMM RRU134 5
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