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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 Bypass
Position
Metering
Position
HP S
C03012
Fig. 26 -- Typical Heat Pump Operation, Heating Mode
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personalinjury
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,andrecoverysystemmustbedesignedtohandlePuron.
If you are unsure, consult the equipment manufacturer.
WARNING
!
Refrigerant System
This information covers the refrigerant system of the 48VT--A
including the compressor oil needed, servicing systems on roofs
containing synthetic materials, the filter drier and refrigerant
charging.
Compr essor 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 absorb 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 some synthetic roofing materials.
Exposure, even if immediately cleaned up, may cause
embrittlement (leading to cracking) to occur in one year or more.
When performing any service that may risk exposure of
compressor oil to the r oof, take a ppropriate precautions to protect
roofing. Procedures which risk oil leakage include, but are not
limited to, compressor replacement, repairing refrigerant leaks,
replacing refrigerant components such as filter drier, pressure
switch, metering device, coil, accumulator , or reversing valve.
Synthetic Roof Precautionary Procedure
1. Cover extended roof working area with an impermeable
polyethylene (plastic) drip cloth or tarp. Cover an
approximate 10x10 ft (3x3 m) area.
2. Cover area in front of the unit service panel with a terry
cloth shop towel to absorb lubricant spills and prevent
run--offs, and protect drop cloth from tears caused by t ools
or components.
3. Place terry cloth shop towel inside unit immediately under
component(s) to be serviced and prevent lubricant run -- offs
through the louvered openings in the unit base.
4. Perform required service.
5. Remove and dispose of any oil contaminated material per
local codes.
Liquid Line Filter Drier
This filter drier is specifically designed to operate with Puron. Use
only factory--authorized components. Filter drier must be replaced
whenever the refrigerant system is opened. When removing a filter
drier, use a tubing cutter to cut the drier from the system. Do not
unsweat a f ilter drier from t he system. Heat from unsweating will
release moisture a nd contaminants from drier into system.
Puron (R-- 410A) Refrigerant Charging
Refer to unit information plate and charging chart. Some R--410A
refrigerant cylinders contain adip tube to allow liquid refrigerant to
flow from cylinder in upright position. For cylinders equipped
with a dip tube, charge Puron units with cylinder in upright
position and a commercial metering device in manifold hose.
Charge refrigerant into suction--line.
TROUBLESHOOTING
Use the Troubleshooting Guides (See Tables 10--12) if problems
occur with these units.
START--UP CHECKLIST
Use Start--Up checklist to ensure proper start -- up procedures are
followed.
48VT--A