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COMPRESSOR
ACCUMULATOR
OUTDOOR COIL
INDOOR COIL
LCS
LEGEND
HPS – High Pressure Switch
LCS – Loss of Charge Switch
Accurater
®
Metering De vice
Arrow indicates direction of flo w
TXV in Metering
Position
Bypass
Position
HP S
C03011
Fig. 25 -- Typical Heat Pump Operation, Cooling Mode
COMPRESSOR
ACCUMULATOR
OUTDOOR COIL
INDOOR COIL
LCS
LEGEND
HPS – High Pressure Switch
LCS – Loss of Charge Switch
Accurater
®
Metering De vice
Arrow indicates direction of flo w
TXV in Bypass
Position
Metering
Position
HP S
C03012
Fig. 26 -- Typical Hea t Pump Operation, Heating Mode
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal injury
or equipment damage.
This system uses Puron (R--410A) refrigerant which has
higher operating pressures than R-- 22 and other refrigerants.
No other refrigerant may be used in this system. Gauge set,
hoses,andrecoverysystemmustbedesignedto handlePuron.
If you are unsure, consult the equipment manufacturer.
WARNING
!
Refrigerant System
This information covers the refrigerant system of the 677C ----A
including the compressor oil needed, servicing systems on roofs
cont aining synt hetic materials, the filter drier and refrige rant
charging.
Compr e ssor Oil
If additional oil is needed use Uniqema RL32--3MAF. If this oil is
not available, use Copeland Ultra 32CC or Mobil Artic EAL22CC.
This oil is extremely hygroscopic, meaning it absorbs water
readily. POE oils can abso rb 15 times as much water as other oils
designed for HCFC and CFC refrigerants. Take all necessary
precautions to avoid exposure of the oil to the atmosphere.
Servicing Systems on Roofs and with Synthetic materials
POE (polyolester) compressor lubricants are known to cause long
term damage to som e synthetic roofing materials.
Exposure, even if immediately cleaned up, may cause
embrittlement (leading to cracking) to occur i n one year or more.
When performing any service that may risk exposure of
compressor oil to the roof, take appr opriate precautions to protect
roofing. Procedures which risk oil leakage include, but are not
limited to, compressor replacement, repairing refrigerant leaks,
677C-- --A