NO CHARGE
Check for leak. Use standard evacuating techniques. After evacu-
ating system, weigh in the specified amount of refrigerant (refer to
system data plate).
LOW CHARGE COOLING
Use Cooling Charging Table. Vary refrigerant until the conditions
of the table are met. Note that charging tables are different from
type normally used. Tables are based on charging the units to
correct superheat for the various operating conditions. Accurate
pressure gauge and temperature sensing devices are required.
Connect the pressure gauge to the service port on the suction line.
Mount the temperature sensing device on the suction line and
insulate it so that the outdoor ambient does not affect the reading.
Indoor air CFM (L/s) must be within the normal operating range of
the unit.
HEATING MODE CHANGE
Do not attempt to adjust charge by cooling methods while in
Heating mode. When charging is necessary in Heating mode,
recoever refridgerant and weigh in according to unit data plate
refrigeration data.
TO USE COOLING CHARGING CHARTS
Take the outdoor ambient temperature and read the suction
pressure gauge. Refer to the chart to determine what the suction
temperature should be.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to Check for Refrigerant Leaks section.
Fig. 20—Typical Heat Pump Operation, Heating Mode
C00095
COMPRESSOR
ACCUMULATOR
OUTDOOR COIL
INDOOR COIL
LCS
LEGEND
HPS – High Pressure Switch
LCS – Loss of Charge Switch
Accurater
®
Metering Device
Arrow indicates direction of flow
Bypass
Position
Metering
Position
HPS
Fig. 21—Typical Heat Pump Operation, Cooling Mode
C00096
COMPRESSOR
ACCUMULATOR
OUTDOOR COIL
INDOOR COIL
LCS
LEGEND
HPS – High Pressure Switch
LCS – Loss of Charge Switch
Accurater
®
Metering Device
Arrow indicates direction of flow
Metering
Position
Bypass
Position
HPS
16
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