INSTALLATION INSTRUCTIONS
R
−
410A Split System Heat Pump
428 01 5301 05
17
Specifications subject to change without notice.
R
−
410A QUICK REFERENCE GUIDE
R
−
410A refrigerant operates at 50%
−
70% higher pressures than R
−
22. Be sure that servicing equipment and
replacement components are designed to operate with R
−
410A.
R
−
410A refrigerant cylinders are rose colored.
Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
R
−
410A systems should be charged with liquid refrigerant. Use a commercial type metering device in the
manifold hose.
Manifold sets should be 750 psig high
−
side and 200 psig low
−
side with 520 psig low
−
side retard.
Use hoses with 750 psig service pressure rating.
Leak detectors should be designed to detect HFC refrigerant.
R
−
410A, as with other HFC refrigerants, is only compatible with POE oils.
Vacuum pumps will not remove moisture from oil.
Do not use liquid line filter
−
driers with rated working pressures less than 600 psig.
Do not install a suction line filter
−
drier in liquid line.
POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
POE oils may cause damage to certain plastics and roofing materials.
Wrap all filter
−
driers and service valves with wet cloth when brazing.
A liquid line filter
−
drier is required on every unit.
Do not use with an R
−
22 TXV.
If indoor unit is equipped with an R
−
22 TXV, it must be changed to an R
−
410A TXV.
Never open system to atmosphere while it is under a vacuum.
When system must be opened for service, break vacuum with dry nitrogen and replace all filter
−
driers.
Do not vent R
−
410A into the atmosphere.
Do not use capillary tube indoor coils.
Observe all
WARNINGS
,
CAUTIONS, NOTES,
and
bold
text.
Copyright 2014 International Comfort Products
Lewisburg, TN 37091 USA
