McQuay RRU999 Installation Manual

Installation, Operation & Maintenance Manual

Refrigerant Recovery Unit, Model RRU999

IOMM RRU999

Group: Refrigerant Effective: December 2000

Supersedes: New

Table of Contents

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

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

Shipping Contents ...................................................................................................................5

Operating Procedures.............................................................................................................6

Calibration Procedure .............................................................................................................9

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

Display Sequence..................................................................................................................12

Electrical Parts Breakdown..................................................................................................13

Replacement Parts List........................................................................................................14

Troubleshooting.....................................................................................................................15

"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 RRU999



1997 McQuay International

Specifications

Electrical Power Requirements

Recovery Main Components : 460 VAC, 60 Hz, 7.5-Hp, 3-Phase, 20-Ampe res

For Controls : 115 VAC, 50/60 Hz, 1-Phase, 20-Amperes

Dimensions (approximate): 54 in. high x 40 in. wide x 40 in. deep

Weight: 400-lbs. (550-lbs shipping)

575 VAC, 60 Hz, 7.5-Hp, 3-Phase, 20-Amperes

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 RRU999 3

Product Description

McQuay’s RRU999 recovery system provides automated recovery of most positive-pressure refrigerants and blends.

The unit consists of a 7.5-hp compressor with a suction accumulator, oil separator, dual high capacity air-cooled condensers, microprocessor control system, and actuated valving system. Unit connections are 1¼ in. male pipe with isolation valves.

After the hoses are connected and purged or evacuated, the RRU999 starts automated recovery by letting the 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 before commencing liquid transfer.

When a pressure transducer determines that pressure differential is below 20 psig and the liquid sensor determines that liquid transfer has been completed, the RRU999 will switch from liquid push/pull mode to vapor recovery. The recovery unit then begins removing vapor from both sides of A/C system. Vapor refrigerant is first cleansed by the 96 cubic inch inlet drier, then travels through coalescent oil separator, then through a suction accumulator, through a crankcase pressure regulator, then finally into the compressor where refrigerant is then compressed. Discharged hot gas from the compressor is then sent through an oil separator where oil is extracted from the hot gas and returned to the compressor. The refrigerant is then condensed by the dual air-cooled condensers and sent to the recovery tank.

The RRU999 can be programmed to stop transfer at 0 psi or 15 in. Hg vacuum. This transfer stops when a pressure transducer indicates the A/C system reaches the programmed pressure. The unit then confirms the vacuum level by monitoring pressure for two minutes. Should pressure in the A/C system rise, the RRU999 energizes again to achieve A/C system vacuum.

Figure 1, RRU999 Connections

1-1/4” REC OVERY C YL IND ER PORT S

A/C SYSTEM

S ID E

VAPOR

T ANK

SID E

LIQUID

H OSE

VAPO R

HOSE

L IQ UID

D RIERS

1-1/4” PORT:

EV APORAT OR

1-1/4” PORT:

C OND ENSE R

4 IOMM RRU999

Shipping Contents

Furnished with RRU999 are:

• 100-ft. 3 phase-VAC power cord

• 100-ft. 120-VAC power cord

• Two 96 cubic inch drier shells

• Four filter cores

Note: Please follow the recommended procedures outlined in this manual for regular changing of compressor oil and coalescent oil filter. Before every recovery job install new drier cores.

Peak Performance:

To get the highest performance from your RRU999 unit, we recommend that you connect to 1¼ in. evaporator and condenser ports on the chiller or A/C system and to recovery cylinders with 1¼ in. ports whenever possible.

Figure 2, Process and Identification Schematic

IOMM RRU999 5

Operating Procedures

:To ensure your safety as well as others, before attempting to recover an A/C, refrigeration or

chiller system, proper and thorough preparation must take place.

• Make sure you have a recovery cylinder with a minimum 1¼ in. male flare vapor port and a

minimum 1¼ in. male flare liquid port. This tank or series of tanks have to be able to hold the entire charge.

• Reminder: The 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 tanks in case the RRU999 needs to be

shut down to prevent overfilling tanks. If a scale is not available, the tanks can be equipped at the time of purchase with a float switch that will work with the RRU999’s microprocessor control circuit.

• 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 RRU999 performing at its highest possible effectiveness.

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

2. Connect the 100-ft 3-phase power cord to a proper size breaker or fused disconnect and plug it

into the RRU999’s control box. Connect the 100-ft 120-VAC 1-phase power cord for controls. Connect at this time, if equipped, with the 80% safety shut off float cable.

3. At this point, the display lights up indicating the unit has power and prompting you to press

“Start”.

An additional feature can be accessed at this time, by pressing the “M” key. This display will show you the total compressor run time as well as give you a historical maintenance schedule. In addition, at every 10 hours of cumulative operating run time for the compressor, an automatic message will appear each time you start the RRU999 until maintenance is performed. After changing oil, then press the “Enter” key which records that maintenance has been performed. A message will then not appear until the next 10 hours of compressor run time is accumulated. The system will retain a log of each maintenance event recorded.

4. The RRU999 then asks you to “Select Refrigerant” being recovered. Scroll to the desired

refrigerant using the “M V” keys then press “Enter”.

5. The RRU999 then prompts you to check selection by displaying “Selected Refrigerant R___,

Is This Correct? Enter = Yes, Canc = No”. The RRU999 then prompts you to select the vapor transfer shutdown pressure with “USE M V to select 0 PSI or 15 Hg Shutdown”. Select desired shutdown pressure, then press “ENTER”.

6. The RRU999 then asks you to “Connect all Refrigerant Hoses” then press “Enter”. Connect

two hoses to the RRU999’s recovery side liquid and vapor ports and to liquid and vapor ports on the recovery cylinder. Connect other two hoses and 96 cubic inch drier shells to system side ports on the RRU999 and to the chiller evaporator and condenser or A/C system.

7. Open vapor and liquid access valves on A/C system being recovered then press “Enter”.

8. “Open system vapor and liquid hand valves on the RRU999 recovery unit” then press “Enter”.

9. “Open recovery vapor and liquid hand valves on the RRU999 recovery unit” then press

“Enter”.

CAUTION

6 IOMM RRU999

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