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18. Function & Control
a)
Preparing for first start up
Restarting after shutting down for long periods
The Heat pump must be started up for the first time by the Technical Service. Before starting up the Heat pumps,
make sure that:-All safety conditions have been respected.
-The Heat pump system is adequately fixed to the surface it rests on.
-Functional distances have been respected.
-Hydraulic connections have been carried out as indicated in the manual.
-The water circuit is filled and vented. When draining after heat pump operation, take care as the water may be hot.
-The water circuit valves are open.
-Electrical connections have been carried out correctly.
-Voltage is within a tolerance of 10% of the rated voltage for the unit.
-The unit is correctly earthed.
-All electrical and hydraulic connections are tight and have been completed correctly.
b)Operating characteristics
Set point in cooling mode
(factory set) = 12°C, Hysteresis = 5°C.
The compressor starts with water temperatures above 12°C.
The compressor shuts down with water temperatures of less than 7°C.
Set point in heating mode
(factory set) = 45°C, Hysteresis = 5°C.
The compressor starts with water temperatures below 45°C.
The compressor shuts down with water temperatures above 55°C.
• In the event of a temporary power failure, when power returns, the mode set previously will be retained in the
memory.
Compressor start up delay
Two functions prevent the compressor from starting up too frequently
- Minimum time since last start-up 300 seconds.
AC OFF control
When gas-liquid separator has liquid refrigerant left, the refrigerant oil in the compressor will be diluted and the
lubricity will decrease, also the liquid compression will be caused, which may damage the compressor. The AC OFF
control is designed to prevent this condition.
①
Starting conditions
18.1 Startup & Running
• &
• When the outdoor unit receives the stop command
• Td
＜
Pd_t +10°C
②
Controls
The compressor is operated in a small capacity to discharge the liquid refrigerant in the gas-liquid separator
• &
• Compresor output 30Hz
• Outdoor LEV original opening 120 degree, adjust by superheat
• Other items are auto control
