Si18-201 System control
Main Functions 149
"
In case of KBPIW 1.5
≤
FPIMN / initial frequency
When initial frequency is equal or smaller than FPIMN / 1.5 = 0.67,
EVL = 52
EVG = 450
EVP = 267 × KBP - 349
The ending condition for startup control and the control when the number of operating room unit
changes,
Cooling mode
DO > DE > 36°C
Heating mode
DO > DGMNT - 5 > DCMXT > 29°C
3.26.4 Outdoor Unit Motorized Valve Control During High Discharge Pipe
Temperature
Outline When the discharge pipe temperature exceeds a certain level during compressor operation, this
function opens the motorized valve to return the refrigerant to a low pressure side in order to
cool the compressor with refrigerant and lower the discharge temperature.
Details
Motorized valve operation in drooping zone
Motorized valve is operated every 20 seconds.
Outdoor motorized valves
Receiver function ON or EVN in fully open condition
#
Normal cooling operation
EVG = EVG + 5 pulses
EVL = EVL + 5 pulses
#
Normal heating operation
EVG = EVG - 5 pulses
EVL = EVL + 5 pulses
BP motorized valve
Regardless of receiver function ON/OFF
#
Normal cooling operation
Open the motorized valve in operating room unit for 5 to 30 pulses.
#
Normal heating operation
Open the motorized valve in connecting room unit for 5 to 30 pulses.
Drooping zone
Reset zone
105
103
(M1044)
Discharge temperature
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