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Special Control
ESiEN09-06 A
32
Function
3.3
Defrosting Operation
To defrost the outdoor unit heat exchanger while in Evaporator, the defrost operation is conducted to recover the
heating capacity.
[Start conditions]
Referring to the set conditions for the following items, start the defrosting operation.
• Heat transfer coefficient of the outdoor unit heat exchanger
• Heat exchange temperature (Tb)
• Timer (Set to two hours at minimum.)
Furthermore, the heat transfer coefficient of the outdoor unit Evaporator is computed from Tc, Te, and compressor
loads.
*
In the case of multi-outdoor-unit system,
Master unit: Performs the operations listed in the table above.
Slave units: Operating units perform the operations listed in the table above.
Non-operating units perform the operations listed in the table above from the Defrost operation.
(Non-operating unit stops during “Defrost preparation operation”.)
*
Actuators are based on RXYQ14~18P.
Outdoor unit actuator
Defrost preparation
operation
Defrost operation
Post Defrost operation
Compressor
Upper limit control
176 Hz + ON + ON
124 Hz + OFF + OFF
2-steps increase/20sec.
till Pc - Pe>0.4 MPa
Outdoor unit fan
STEP7
or
STEP8
OFF
STEP8
Four way valve
ON
OFF
ON
Main motorized valve (EV1)
SH control
480 pls
480 pls
55 pls
Subcooling motorized valve (EV2)
0 pls
0 pls
0 pls
Hot gas bypass valve (SVP)
OFF
OFF
OFF
Accumulator oil return valve (SVO)
ON
ON
ON
Injection (SVT) (RXYQ5P model only)
OFF
OFF
OFF
Ending conditions
170 sec.
10 min.
Tb>11 C
10 sec.
Pc - Pe>0.4MPa
or
or
AHU actuator
During defrost
Fan
Thermostat ON unit
Field setting
Stopping unit
OFF
Summary of Contents for ERQ Series
Page 2: ......
Page 16: ...Combination Table ESiEN09 06 A 6 General Information...
Page 17: ...ESiEN09 06 A Specifications 7 1 Specifications 8 1 1 Outdoor Units 8...
Page 33: ...ESiEN09 06 A Function general Function 23 1 2 Operation Mode...
Page 58: ...Outline of Control ESiEN09 06 A 48 Function...
Page 71: ...ESiEN09 06 A Wiring Diagram of Control Box Control Box EKEQ CBV3 61 3 2 F box...
Page 109: ...Test Operation ESiEN09 06 A 100 Test Operation 1 2 2 Turn power on...