Haier AU242FHBHA Installation Manual

Also see for AU242FHBHA: Service manual Installation manual

21NOTE : (for adding R407C refrigerant)Containers for R407C refrigerant must be marked with R407C and a brown Stripe.R407C and R22 refrigerants cannot share the same instrument distributor and filling pipes.Example of scavenging systemScavenger fan and its correlative leakage alarmscavenge portGas leakage alarm should be setat the place where leakedrefrigerant gather together.The room where refrigerant leakage takes place.Refrigerant concentration0.3(kg/m3)2. Calculating method of refrigerant concentrationCalculate concentration as follows.(1) Calculate the total amount of refrigerant of each cooling system(kg) = Refrigerantcharge amount of one system of outdoor unit + Additional refrigerant charge amountRefrigerant charge amount of one system of outdoor unit means: Refrigerant amount when leaving factoryAdditional refrigerant charge amount means: Additional refrigerant amount charged according to pipinglength and piping diameter during site operation.(2) Calculate space of the smallest room installing indoor unit(3) Calculate the concentration of refrigerantTotal charge amount of cooling systemSpace of the smallest roominstalling indoor unit3. Method of avoiding refrigerant concentration to exceed critical concentration(1)Open an vent openingOpen vent opening on both top and bottom part of door which connects to outdoor.Each opening is no less than 0.15% of the room space. Vent opening could also be opened on the wall directly.(2)Decease charge amount of refrigerant Shorten piping length.Let indoor unit and outdoor unit nearer to shorten piping length so as to decrease refrigerant amount.Decrease indoor and outdoor unit capacityConstitute one outdoor unit with several units.Then each outdoor unit capacity decreases and refrigerant amount is less.(3)Set the scavenger fan by oneselfIn order to keep refrigerant concentration below critical concentration, user can use the scavenger fan all thewhile to let in fresh air.In condition of non-stop scavenging cannot be executed, let scavenger fan correlative to leakage alarm(In case of leaking, scavenger fan works immediately.) (As follow)Indoor unitOutdoor unit (Refrigerants will all leak out.)Others and Test Run