Mitsubishi Electric PKA-RP1.6GAL Service Technical Manual page 54

Control modes
5-1. Normal control
5. LEV(B)
5-2. Compulsory step-up
5-3. Stop control
Opening pulse will vary among steps (1 to 3) according to air conditioner's
operating status.
• Control timing: Once every 5 minutes after 3 or 7 minutes have passed since
the compressor started.
• LEV opening pulse for each step:
Step RP1.6VHA RP2VHA RP2.5VHA
1 150 170 150
2 300 300 300
3 480 480 480
• Start-up step
The step is set to 2 when the compressor starts up.
• Requirement for step-up
LEV opening pulse will step up when any of following conditions is satisfied.
(1) The discharge temp. (TH4) is 100: or more
(2) The outdoor condenser/evaporator temperature (TH6) is 57: or more
(3) The discharge super heat temperature is 50: or more
Super heat temperature = Discharge temperature (TH4) - Outdoor
condenser/evaporator temperature (TH6)
(4) The sub cool temperature is 12: or more
Sub cool temperature = Outdoor condenser/evaporator temperature (TH6)
- Outdoor liquid pipe temperature (TH3)
• Requirement for step-down
LEV opening pulse will step down when any of following conditions are
satisfied and above step-up conditions are not satisfied.
(1) The discharge temperature (TH4) is 90: or less
(2) The outdoor condenser/evaporator temperature (TH6) is 52: or less
(3) The discharge super heat temperature is 40: or less
Super heat temperature = Discharge temperature (TH4) - Outdoor
condenser/evaporator temperature (TH6)
(4) the sub cool temperature is 3: or less
Sub cool temperature = Outdoor condenser/evaporator temperature
(TH6) - Outdoor liquid pipe temperature (TH3)
• The step does not change if neither step-up conditions nor step-down
conditions are satisfied.
When any of the following conditions are satisfied, the step will be forced to 3.
(1) The discharge temperature (TH4) is 110: or more.
(2) The condenser/evaporator temperature (TH6) is 62: or more.
When the LEV is being stopped, the step will be set to 3.
Control details
RP3VHA RP4VHA RP5VHA RP6VHA RP4VHA
200 180 180 185
300 300 300 300
480 480 480 480
54
RP5VHA RP6VHA
1 1 1
180 180 185
240 240 240
480 480 480
Remarks