Startup Control In Heating - Daikin RXYQ-TA Series Service Manual

Startup Control
4.2

Startup Control in Heating

Inverter compressor 1
(M1C)
Inverter compressor 2
(M2C)
∗ RXYQ144/168TA only
Electronic expansion
valve (main)
(Y1E)
Inverter fan
M1F: RXYQ72TA
M1F + M2F: RXYQ96-168TA
Pc : High pressure sensor detection value
Pe : Low pressure sensor detection value
Ta : Outdoor air temperature
Te : Low pressure equivalent saturation temperature
55
Frequency step up
5 sec. interval
E
D
C
B
+12 Hz/20 sec.
A A
0 Hz
+12 Hz/20 sec.
A
0 Hz
T(Ta–Te)control
Initial
opening
0 pulse
Step 8
Step 4
Pc – Pe > 0.17 MPa (24.7 psi)
Frequency
(Hz)
A
B
C
D
E
Pc – Pe > 0.78 MPa (113 psi)
OR Pc – Pe > 0.39 MPa (56.6 psi)
&
&
164 Hz or more
DSH > 10˚C (18˚F)
SiUS341615E
RXYQ72TA
RXYQ96/120TA
RXYQ144/168TA
52 60
74 75
90 90
120 120
164 180
Functions and Control