Haier MRV II - Part 2 Commissioning and Maintenance for R22 System

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1. Working preparation before debugging
1.1 Outdoor checking
1.1.1 Refrigerant pipe length and drop height checking
Allowable refrigerant pipe length and height
Refrigerant pipe length(one way) Indoor unit, Max.
100m
Piping length between outdoor and the first
branch(main pipe)
Max. 70m
Piping length after the first branch Max. 50m
Piping length between outdoor units Less than 5m to the
first gather pipe
Outdoor is higher Max.50m
Height difference
between IU &OU
Indoor is higher Max.40m
Height difference between outdoor units( the
same system)
In horizon
Height difference between indoor units Max.20m
Voltage range
Rated voltage ±10%
Voltage decrease
when starting
Rated voltage ±15%
Voltage
Unbalance among
phases
Rated voltage ±3%
Part 2