Service manual

120
18
Trial Operation
Procedure and Summary of Trial Operation
NOTE 1: Criteria for indoor air inlet/outlet temperature difference
After operation for a minimum of 30 minutes in “COOL” mode, if temp. difference
between the air inlet and air outlet of the indoor unit is 8°C or more – operation
is normal.
(In Max. Hz operation)
• The difference in temperature between the air inlet and air outlet decreases
when the total number of indoor units connected, exceeds 100% of the system
capacity, or when the pipe length exceeds specification.
NOTE 2: Criteria of operation current value
In cooling operation, when the current is within ± 15% of the specified current
value, the system is operating normally.
(COOL Max. Hz operation)
The current value differs as described below according to the operation conditions.
• Greater than the specified current
(1) Temp. in indoor/outdoor is high.
(2) Radiation of outdoor unit is bad.
• Less than the specified current
(1) Temp. in indoor/outdoor is low.
(2) Gas leakage. (Insufficient refrigerant amount)
NOTE 3: Criteria of operation pressure
COOL/
High pressure 16 to 22kgf/cm
2
G
Indoor 18 to 32°C
HEAT
Low pressure 3.5 to 5.5kgf/cm
2
G
Outdoor 25 to 35°C
NOTE: Measurement taken 15 minutes after operation start (Dry bulb temp. °C)