Haier MRV S II - Heating Capacity; System Marks; Trial Operation Sequence

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Heating capacity
■ The heating mode adopts the heat pump type that absorbs outdoor heat energy and releases into indoor. So if
outdoor temperature goes down, the heating capacity will decrease.
Trial operation
■ Before trial operation:
Before being energized, measure the resistor between power terminal block (live wire and neutral wire) and the
grounded point with a multimeter, and check if it is over 1M * . If not, the unit can not operate.
To protect compressor, energize the outdoor unit for at least 12 hours before the unit runs.If the crankcase
heater is not energized for 6 hours, the compressor will not work.
Conrm the compressor bottom getting hot.
Except for the condition that there is only one master unit connected (no slave unit), under the other conditions,
open fully the outdoor operating valves (gas side, liquid side, oil equalization pipe). If operating the unit without
opening the valves, compressor failure will occur.
Conrm all indoor units being electried. If not, water leakage will occur.Measure the system pressure with
pressure gauge, at the same time, operate the unit.
■ Trial operation
In trial operation, refer to the information of performance section.When the unit can not start up at the room
temperature, make trial operation for outdoor.
1. System marks
On the condition that multi MRV II system are installed, in order to conrm the relationship between outdoor and indoor,
please make marks on outdoor electric control box cover to indicate the connected indoor unit. As the below gure:
2. Trial operation sequence
Indoor model:
Inspection defore trial operation
Solve the problems if failure
occurs
State setting of trial operation
Indoor conrmation
Outdoor conrmation
Power on conrmation
Rated operation
Wiring conrmation
System conrmation
Conrm data of trial operation
Room No.
e.g. Indoor A, System 1,
Floor 2 2F-1A