Randell FX-1A-290, Operator'S Manual

OM-FX SERIES       13

Service

This piece of equipment uses a R290 Refrigeration system.  This equipment has been 

clearly marked on the serial tag the type of refrigerant that is being used.   There is also a 

warning labels stating that the unit contains R290 refrigerant. R290 is safe to use as long 

as you follow these warning labels and some.  

No smoking or open flames when servicing this equipment.  If needed, use a CO

2

 or 

dry=power type fire extinguisher

Replacement parts used on any R290 Refrigeration system cabinet must have specific UL 

certification for non-sparking components. 

Only authorized service technician, certified in R290 system should service this equipment.

MANIFOLD SET

A R134A manifold set can be used for servicing this equipment.  

REFRIGERANT RECOVERY

Follow all national and local regulations for R-290 refrigerant recovery.  

LEAKING CHECKING AND REPAIR

Leak check an R-290 system the same way you would an R-134a or R-404A system with 

the following exceptions. 

1.  Do not use a Halid leak detector on a R290 system.

2.  Electronic leak detector must be designated specifically for combustible gas.

Use of a bubble solution or an ultrasonic leak detector are acceptable.   

When repairing a leak, it is recommended using oxygen free dry nitrogen with a trace gas 

not exceeding 200PSI. 

When accessing an R290 system, piercing valves are not to remain on the equipment in 

a permanent manner. After charge is recovered, Schrader valves are to be installed on the 

process stubs.  Proper charge is to be weighed into the system and the system is to be 

leak checked afterwards.

The R290 equipment must have red process tubes and other devices through which the 

refrigerant is serviced, such as any service port.  This color marking must remain on the 

equipment.  If marking is removed, it must be replace and extend at least 2.5 centimeters 

(1”) from the compressor.

CHARGING

Follow the charge amount specified on the data tag.  It is recommended to use the shortest 

hoses possible to prevent undercharging.

•  Ensure the system is sealed and leak checked 

•  Evacuate system to a minimum 500 micron

•  Weigh in correct charge

•  Leak check the system again

•  Bleed the refrigerant from the high side hose to the low side hose

•  Disconnect the hoses

•  Remove line taps