Mitsubishi Electric PKA-RP1.6GAL Service Technical Manual page 49

Control modes
3-1. Normal control
3. LEV(A)
3-2. Compulsory step-up
3-3. 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 RP3VHA
1 195 200 150
2 300 300 300
3 480 480 480
• Requirement for step-up
LEV opening pulse will step up when any of following conditions is satisfied.
(1) The discharge temperature (TH4) is 100: or more
(2) The outdoor condenser/evaporetor temperature (TH6) is 57: or more
(3) The discharge super heat temperature is 50: or more Super heat
temperature = Discharge temperature (TH4) - Outdoor condenser/evaporetor
temperature (TH6)
(4) The sub cool temperature is 12: or more
Sub cool temperature = Outdoor condenser/evaporetor temperature (TH6)
- Outdoor liquid pipe temperature (TH3)
• Requirement for step-down
LEV opening pulse will step down when any of following conditions is satisfied
and any of step-up conditions are NOT satisfied.
(1) The discharge temperature (TH4) is 90: or less.
(2) The outdoor condenser/evaporetor temperature (TH6) is 52: or less.
(3) The discharge super heat temp. is 40: or less.
Super heat temperature = Discharge temperature (TH4) - Outdoor
condenser/evaporetor temperature(TH6)
(4) The sub cool temperature is 3: or less.
Super heat temperature = Outdoor condenser/evaporetor 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 is satisfied, the step will be forced to 3.
(1) The discharge temperature (TH4) is 110: or more.
(2) The condenser/evaporetor temperature (TH6) is 62: or more.
When the LEV is being stopped, the step will be set to 3.
Control details
RP4VHA RP5VHA RP6VHA RP4VHA
200 220 220 220 220
300 300 300 300 260
480 480 480 480 480
49
Remarks
RP5VHA RP6VHA
1 1 1
220 220
260 260
480 480