SiUS371614E
Outline of Control (Indoor Unit)
Functions and Control
112
9.15.3 Economizer
When indoor and outdoor air temperatures are reversed, the compressor is stopped to let in the
outdoor air to save energy.
This operation is called economizer operation, and the equipment to detect indoor and outdoor air
temperatures and open and close the damper to perform this operation is called an economizer.
The economizer detects indoor and outdoor air temperatures, informs the air conditioner that the
economizer operation is ready, and opens and closes the damper.
The indoor unit stops the outdoor unit when it receives a signal from the economizer and performs
air supply operation.
When the indoor air temperature is cooled down sufficiently by the economizer operation, and it is
no longer necessary (thermostat OFF), the indoor unit outputs a signal to the economizer to close
the damper.
Thermostat ON signal
Operation
Indoor unit ON signal
∗
1. Thermostat ON signal: A signal to turn ON the indoor unit thermostat and allow the economizer
to open the damper.
It turns ON the relay on the X2M-ECONOMIZER2 on the PCB.
∗
2. External input ON is an input signal to the X1M-ECONOMIZER1 terminal on the PCB.
∗
3. Refer to Optional Kit Setting (UV lamp + Humi Economizer) (for FXTQ-TA model) on page 131.
∗
4. Remote control ON signal: Contact output which shows the operating status of the indoor unit.
This signal turns on the relay X2M-CONTROL ON/OFF on the PCB.
&
Elimination of others
Stop the thermostat ON signal (
∗
1)
to the economizer.
Transfer the thermostat ON signal (
∗
1) to
the economizer.
•
Cooling mode
•
When the thermostat is ON
&
•
Cooling mode
•
When the thermostat is ON
•
External output: ON (
∗
2)
OR
•
Tcon
≤
Ts’ continues for 1
minute
•
Economizer set time (
∗
3):
Free cooling only
&
•
Economizer set time (
∗
3)
≠
Free cooling only
•
Thermostat ON continues for
the economizer set time (
∗
3)
•
Air conditioner operation is
stopped.
•
The remote controller indicates
cooling operation.
•
The fan tap follows the remote
controller.
•
Air conditioner operation is
started.
•
The remote controller
indicates cooling operation.
•
The fan tap follows the
remote controller.
Normal operation
Elimination
of others
Free cooling
Free cooling & Mech Cooling
Remote control ON
Remote control OFF
Stop indoor unit ON signal (
∗
4)
to the economizer.
Transfer indoor unit ON signal (
∗
4) to the
economizer.
Summary of Contents for REYQ-TA Series
Page 1: ...Service Manual SiUS371614E REYQ72 456TAYDU REYQ72 456TATJU Heat Recovery 60 Hz...
Page 304: ...Wiring Diagrams SiUS371614E 291 Appendix REYQ96 120TAYDU 2D106425A...
Page 305: ...SiUS371614E Wiring Diagrams Appendix 292 REYQ144 168TAYDU 2D106426A...
Page 306: ...Wiring Diagrams SiUS371614E 293 Appendix REYQ72TATJU 3D106421A...
Page 307: ...SiUS371614E Wiring Diagrams Appendix 294 REYQ96 120TATJU 2D106422A...
Page 308: ...Wiring Diagrams SiUS371614E 295 Appendix REYQ144 168TATJU 2D106423A...
Page 318: ...Wiring Diagrams SiUS371614E 305 Appendix VAM1200GVJU 3D073270C...
Page 320: ...Wiring Diagrams SiUS371614E 307 Appendix 1 4 2 Multi Branch Selector Unit BS4Q54TVJ 3D089123B...
Page 321: ...SiUS371614E Wiring Diagrams Appendix 308 BS6 8Q54TVJ 2D089122B...
Page 322: ...Wiring Diagrams SiUS371614E 309 Appendix BS10 12Q54TVJ 2D089121B...
Page 323: ...Revision History Month Year Version Revised contents 02 2017 SiUS371614E First edition...
