BMC Heat Pump GTA3600UD1AA ユーザーズマニュアル

Manual 2100-537

I

 

Page 

44 of 54

These units require R-410A refrigerant and Polyol Ester.

1.  Use separate service equipment to avoid cross    

 

contamination of oil and refrigerants.

2.  Use recovery equipment rated for R-410A  

 

 refrigerant.
3.  Use manifold gauges rated for R-410A (800 psi/250  

 

psi low).

4.  R-410A is a binary blend of HFC-32 and HFC-125.
5.  R-410A is nearly azeotropic - similar to R-22 and  

 

R-12.  Although nearly azeotropic, charge with   

 

liquid refrigerant.

6.  R-410A operates at 40-70% higher pressure than     

 

R-22, and systems designed for R-22 cannot    

 

withstand this higher pressure.

7.  R-410A has an ozone depletion potential of zero,  

 

but must be reclaimed due to its global warming  

 potential.
8.  R-410A compressors use Polyol Ester.
9.  Polyol Ester oil is hygroscopic; it will rapidly absorb  

 

moisture and strongly hold this moisture in the oil.

10. A liquid line dryer must be used - even a deep    

 

vacuum will not separate moisture from the oil.

11. Limit atmospheric exposure to 15 minutes.
12. If compressor removal is necessary, always plug  

 

compressor immediately after removal.  Purge with  

 

small amount of nitrogen when inserting plugs.

If a leak has occurred in the system, reclaiming, 

evacuating (see criteria above), and charging to the 

nameplate charge is recommended.
Topping off the system charge can be done without 

problems.  With R-410A, there are no significant 

changes in the refrigerant composition during multiple 

leaks and recharges.  R-410A refrigerant is close to being 

an azeotropic blend (it behaves like a pure compound 

or single component refrigerant).  The remaining 

refrigerant charge, in the system, may be used after leaks 

have occurred and then “top-off” the charge by utilizing 

the charging charts on the inner control panel cover as a 

guideline.
REMEMBER:  

When adding R-410A refrigerant, it must 

come out of the charging cylinder/tank as a liquid to 

avoid any fractionation, and to insure optimal system 

performance.  Refer to instructions for the cylinder that 

is being utilized for proper method of liquid extraction.

1.  Never mix R-410A with other refrigerants.
2.  Use gloves and safety glasses, Polyol Ester oils can  

 

be irritating to the skin, and liquid refrigerant will  

 

freeze the skin.

3.  Never use air and R-410A to leak check; the    

 

mixture may become flammable.

4.  Do not inhale R-410A – the vapor attacks the    

 

nervous system, creating dizziness, loss of  

 

 

coordination and slurred speech.  Cardiac  

 

 

irregularities, unconsciousness and ultimate death  

 

can result from breathing this concentration.

5.  Do not burn R-410A.  This decomposition  

 

 

produces hazardous vapors.  Evacuate the area if  

 exposed.
6.  Use only cylinders rated DOT4BA/4BW 400.
7.  Never fill cylinders over 80% of total capacity.
8.  Store cylinders in a cool area, out of direct  

 

 sunlight.
9.  Never heat cylinders above 125°F.
10. Never trap liquid R-410A in manifold sets, gauge  

 

lines or cylinders.  R-410A expands significantly  

 

at warmer temperatures.  Once a cylinder or line is  

 

full of liquid, any further rise in temperature will  

 

cause it to burst.