EasyManuals Logo
Home>McQuay>Chiller>AGR 090AS

McQuay AGR 090AS User Manual

McQuay AGR 090AS
106 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #99 background imageLoading...
Page #99 background image
IOMM AGR AGR 055A through 100A 99
Unit Maintenance
General
On initial start-up and periodically during operation, it will be necessary to perform certain routine
service checks. Among these are checking the liquid line sightglasses, taking condensing and
suction pressure readings, and checking to see that the unit has normal superheat and subcooling
readings. A recommended maintenance schedule is located at the end of this section.
A Periodic Maintenance Log is located at the end of this manual. It is suggested that the log be
completed on a weekly basis preferably on a daily basis The log will serve as a useful tool for a
service technician in the event service is required.
Compressor Maintenance
The reciprocating compressors require no routine maintenance.
Lubrication
No routine lubrication is required on AGR units. The fan motor bearings are permanently
lubricated and no further lubrication is required. Excessive fan motor bearing noise is an indication
of a potential bearing failure.
Compressor oil should be standard refrigeration mineral oil such as Suniso 3GS.
Electrical Terminals
WARNING
Electric shock hazard. Turn off all power before continuing with following service.
Tighten electrical terminals per Maintenance Schedule.
Condensers
The condensers are air-cooled and constructed of 3/8" (9.5mm) O.D. internally finned copper tubes
bonded in a staggered pattern into louvered aluminum fins. No maintenance is ordinarily required
except the routine removal of dirt and debris from the outside surface of the fins. McQuay
recommends the use of foaming coil cleaners available at most air conditioning supply outlets. Use
caution when applying such cleaners as they may contain potentially harmful chemicals. Care
should be taken not to damage the fins during cleaning.
If the service technician has reason to believe that the refrigerant circuit contains noncondensables,
purging may be required strictly following Clean Air Act regulations governing refrigerant
discharge to the atmosphere. The purge Schrader valve is located on the vertical coil header on both
sides of the unit at the control box end of the coil. Access panels are located at the end of the
condenser coil directly behind the control panel. Purge with the unit off, after shutdown of 15
minutes or longer, to allow air to collect at the top of the coil. Restart and run the unit for a brief
period. If necessary, shut unit off and repeat the procedure. Follow accepted environmentally sound
practices when removing refrigerant from the unit.
Refrigerant Sightglass
The refrigerant sightglasses should be observed periodically. (A weekly observation should be
adequate.) A clear glass of liquid indicates that there is adequate refrigerant charge in the system to
insure proper feed through the expansion valve. Bubbling refrigerant in the sightglass, during
stable run conditions, indicates that the system may be short of refrigerant charge. Refrigerant gas
flashing in the sightglass could also indicate an excessive pressure drop in the liquid line, possibly

Other manuals for McQuay AGR 090AS

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the McQuay AGR 090AS and is the answer not in the manual?

McQuay AGR 090AS Specifications

General IconGeneral
BrandMcQuay
ModelAGR 090AS
CategoryChiller
LanguageEnglish

Related product manuals