Heat Controller R410A manual Service Tools, Service Procedures, Gauge Manifold Sets, Vacuum Pump

R410a Application and Service Guide

Figure 1. PPM of Water Absorbed Over Time

POE: Continues to absorb moisture

PPM of

Water

Mineral Oils: Max water absorption, excess separates

24 hrs

Time

•A vacuum pump will not adequately remove mois- ture from the POE lubricants. Use a filter drier and replace whenever the system is opened.

•POEʼs can be irritating to the skin

•POEʼs can damage some roofing membrane materi- als

•POEʼs are better solvents than mineral oils

•Leave POE Refrigerant circuits open no more than 15 minutes

Approved POE Oils for Copeland R410a and R407c

compressors are:

•Copeland Ultra 22CC

•Copeland 3MA (scroll compressors only)

•Mobil EAL Arctic 22CC

•ICI (Virginia KMP) Emkarate RL32CF

•Thermal Zone 22CC

Service Tools

It is recommended that a separate R410a tool set be em- ployed to avoid the problem of mixing refrigerants on the job site.

Gauge Manifold Sets

A specific gauge set for use with R410a is required. These will allow pressure measurements to 800 psig on the high side and 250 psig on the low side. Hoses should have a service rating of 800 psig.

Vacuum Pump

A 500 micron evacuation IS NOT ADEQUATE to sepa- rate moisture from POE oil in R410a systems. It is for this reason that an R410a approved liquid line filter drier should be installed everytime the system is opened.

Leak Detectors

An approved leak detector for HFC refrigerants can be

used in R410a systems. Older R22 leak detectors and Ha- lide torch leak detectors can not be used in R410a service. NEVER use a mixture of air and R410a to leak check.

The mixture may become flammable at pressures above amtospheric. Nitrogen and trace R410a or nitrogen alone can be safely used for leak testing in R410a systems. Six approved leak detector types for alternative refrigerants are:

•Non-selective detectors

•Halogen specific

•Compound specific

•Infrared based

•Flourescent dyes

•Ultrasonic

Active Recovery Equipment (Self-Contained)

Due to the increased pressure of R410a, recovery equip- ment has been redesigned to handle these higher pres- sures. Recovery equipment rated for R410a must be used. Recovery cylinders must have a service pressure rating of 400 psig (DOT 4BA 400 and DOT 4BW 400 are accept- able). DO NOT USE STANDARD DOT RECOVERY

OR STORAGE CYLINDERS WITH A 300 PSIG RAT- ING WITH R410A!

Other Service Tools

Other service tools such as the micron gauge and vacuum pump are adequate for both R22 and R410a service.

Service Procedures

Leak Detection

If an R410a system develops a leak, the technician does not have to recover the the remaining refrigerant from the system before topping-off the system. Because R410a is close to being an azeotropic blend, it behaves like a pure compound or single component refrigerant. The techni- cian can use the existing refrigerant in the system after leaks have occurred. There is no significant change in the refrigerant composition during multiple leaks and re- charges. However, the service technician must remember that when adding R410a to the system, it must come out of the charging cylinder as a liquid to avoid fractionation and for optimum system performance. If the refrigeration system has lost its complete charge, the system should be leak checked, repaired, liquid line filter drier replaced and evacuated below 500 microns. A digital scale or a calibrated charging cylinder designed for the greater pres- sures of R410a should then be used to recharge R410a back into the system.

The Refrigerant Recycling Regulations Section 608 of the Clean Air Act states that the technician must find and

repair substantial leaks of systems with 50 lbs. or more of

refrigerant. Substantial leaks are defined as:

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