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

SiUS371614E
4.2

Startup Control in Heating

Inverter compressor 1
(M1C)
Inverter compressor 2
(M2C)
∗ REYQ96-168TA only
Electronic expansion
0 pulse
valve (main)
(Y1E)
Inverter fan
Step4
M1F: REYQ72TA
M1F + M2F: REYQ96-168TA
Pc : High pressure sensor detection value
Pe : Low pressure sensor detection value
Ta : Outdoor air temperature
Te : Low pressure equivalent saturation temperature
Functions and Control
Frequency step up
5 sec. interval
E
D
C
B
+3 Hz/5 sec.
A A
0 Hz
+3 Hz/5 sec.
A
0 Hz
PI control
Initial
opening
Step8
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 > 12˚C (21.6˚F)
Startup Control
REYQ72TA REYQ96-168TA
60 52
75 74
90 90
120 120
180 164
62