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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
♦ The reservoir collects the vaporised and gaseous mixture
coming from the evaporator to ensure the air conditioner com‐
lk
pressor receives only gaseous refrigerant. The vapour be‐
comes gaseous refrigerant.
♦ Refrigerant oil flowing in the circuit does not remain in the res‐
ervoir because an oil extraction hole has been provided.
♦ Any moisture ingress into the refrigerant circuit during assem‐
bly is trapped by a filter (desiccant bag) in the reservoir.
♦ Gaseous refrigerant with oil is drawn in by the air conditioner
compressor.
Note
♦ Renew the reservoir if the refrigerant circuit has been open for
an extended period of time and moisture has entered or if re‐
quired to do so owing to a specific complaint ⇒ page 79 .
♦ Do not remove sealing plugs -A- and -B- until just before in‐
stallation.
♦ A dryer kept in an unsealed reservoir is saturated with mois‐
ture after a short time and cannot be used.
♦ When installing, observe arrow indicating direction of flow if
applicable.
1.2.7
Heat exchanger for heat pump mode
The gaseous or vaporous refrigerant compressed by the air con‐
ditioning compressor is liquefied in the heat exchanger -A-. The
heat that is given off in the process is picked-up by the coolant
flowing through the system ⇒ Heating, air conditioning; Rep. gr.
87 ; Refrigerant circuit; System overview - refrigerant circuit .
1.2.8
Liquid receiver
In certain operating conditions (e.g. in heat pump mode), the re‐
ceiver (e.g. on the condenser) is not integrated in the refrigerant
circuit. The receiver -B- collects the refrigerant, temporarily stores
any excess should a certain amount of refrigerant not be required
and then feeds it in a steady flow to the expansion valve (in front
of the evaporator in the heater and air conditioning unit) or to the
heat exchanger in the coolant circuit of the high voltage system
⇒ Heating, air conditioning; Rep. gr. 87 ; Refrigerant circuit; Sys‐
tem overview - refrigerant circuit .
1. Refrigerant circuit
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