Daikin ERQ Service Manual page 38

Special Control
3.2.2 Oil Return Operation in Heating Operation
[Conditions to start]
The heating oil-returning operation is started referring following conditions.
Outdoor Unit Actuator
Compressor
Outdoor unit fan
Four way valve
Main electronic expansion valve
(EV1)
Subcooling electronic expansion
valve (EV3)
Hot gas bypass valve (SVP)
Ending conditions
* From the preparing oil-returning operation to the oil-returning operation, and from the oil-
returning operation to the operation after oil-returning, the compressor stops for 1 minute to
reduce noise on changing of the four way valve.
Fan
28
Integrated amount of displaced oil
Timer
(After the power is turned on, integrated operating-time is 2 hours and subsequently every 8
hours.)
In addition, integrated amount of displaced oil is derived from Tc, Te, and the compressor
load.
Oil return preparation
operation
Upper limit control
STEP8
ON
SH control
0 pls
OFF
2 min.
AHU actuator
Thermostat ON unit
Stopping unit
Oil return operation
140 Hz Full load
OFF
OFF
480 pls
0 pls
OFF
• 12 min.
or
• Ts1 - Te<5°C
{
&
• Tb>11°C
Heating oil return operation
Field setting
: http://splitoff.ru/tehn-doc.html
ESIE09-05
Post-oil-return operation
2-step increase from
36 Hz Unload to
(Pc - Pe>0.4 MPa)
every 20 sec.
STEP8
ON
55 pls
0 pls
OFF
• 160 sec.
or
• Pc - Pe>0.4MPa
OFF
Function