13
V. Refrigerating circuit
Installation & Maintenacne Manual
No refrigerant replenishment is required if extended length of fitting pipe is less than 7m.
If extended length of fitting pipe is over 7m, replenishing volume of refrigerant should be
calculated as per the following formula: replenishing volume Xg=15g/mX(A-7)m
Outdoor unit
Indoor
unit
Maximum height difference 5m
(regardless either unit is higher)
Max. Lenth of extended fitting pipe
Refrigerant replenishment (R22:g):
Refrigerating circuit for heat pump type
Capillary(heating)
Room-temperature
thermistor RT11
Pipe-temperature
thermisto
Indoor unit Outdoor unit
Indoor heat
exchanger
Outdoor heat
exchanger
Flow direction of refrigerant
for cooling
Flow direction of refrigerant
for heating
Joint of flared pipe
Connecting pipe
(with heat-insulating
pipe casing)
Joint of flared pipe
Connecting pipe
(with heat-insulating
pipe casing)
Shutoff valve
(with access door)
Shutoff valve
4-way valve
Compressor
Check valve
Capillary(cooling)
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