Startup Control In Heating - Daikin REYQ-XA Service Manual

Startup Control
4.2

Startup Control in Heating

Compressor (M1C)
Electronic expansion
0 pulse
valve (main)
(Y1E)
Inverter fan
Step 4
(M1F + M2F)
DSH: Discharge pipe superheating degree
Pc : High pressure sensor detection value
Pe : Low pressure sensor detection value
109
Frequency step up
5 sec. interval
+10 rps/10 sec.
E
D
C
B
A
0 Hz
PI control
Initial
opening
Step 8
Pc – Pe > 0.17 MPa (24.7 psi)
Frequency
(rps)
A
B
C
D
E
Pc – Pe > 0.42 MPa (60.9 psi)
OR Pc – Pe > 0.32 MPa (46.4 psi)
&
&
20 rps or more
DSH > 12˚C (21.6˚F)
SiUS371901E
REYQ72-120XA REYQ144/168XA
19 16.4
24 16.4
29 18
38 24
57 36
Functions and Control