Daikin RXSQ24TAVJU Service Manual page 59

SiUS331708EA
3.1.2 Startup Control in Heating Operation
Electric symbol
Outdoor unit
actuator
24/36 class 48 class 60 class
Compressor M1C
Outdoor fan M1F
Four way valve Y1S
Main electronic
Y1E
expansion valve
Subcooling

electronic
expansion valve
Hot gas bypass
Y2S
valve
Injection valve Y3S
Ending conditions
Functions and Control
Thermostat ON
Pressure equalization control
prior to startup
M1C M1C 0 Hz
From starting
M1F,
M1F Ta > 20°C (68°F): STEP 1
M2F
Ta ≤ 20°C (68°F): OFF
Y1S Y1S Holds
Y1E Y1E 0 pulse

Y3E 0 pulse
 
ON

Y3S OFF
• Pc – Pe < 0.3 MPa
OR
(43.5 psi)
• A lapse of 5 min.
Startup control
STEP 1
Increases 2 steps every 20 seconds
from minimum frequency
Minimum frequency
until Pc – Pe > 0.39 MPa
(56.6 psi) is achieved
STEP 8 STEP 8
ON ON
0 pulse 0 pulse
0 pulse 0 pulse
OFF OFF
OFF OFF
OR
A lapse of 10 sec.
Special Control
STEP 2
• A lapse of 130 sec.
• Pc > 2.70 MPa
(392 psi)
• Pc – Pe > 0.39 MPa
(56.6 psi)
46