Outdoor Unit Ccu (Command Controller Unit) Control - Panasonic U-72MF2U9 Service Manual

6. Outdoor Unit CCU (command controller unit) Control

6-1. MOV of Indoor Unit
6-1-1. MOV of each indoor unit operation mode
Mode of Outdoor unit
indoor unit (system)
Stop
Stop
Operating
Stop
Fan
Operating
Stop
Cooling Operating
Operating
Stop
Operating
Heating
Operating
Operating
* The meaning of outdoor unit "Operating" is functioning as a cooling or heating system at least more than one
compressor operating simultaneously.
*1 SH control adjusts the difference between the liquid temperature and gas temperature in indoor unit.
SH = gas temperature (E3) ~ liquid temperature (E1)
Target SH is 1.8deg F ~ 5.4deg F (1deg C ~ 3deg C) when required level of indoor unit is "30" or "31(test run)".
Note: When the refrigerant amount in the system is adjusted, it is necessary to select test run that the required
level becomes "31".
*2 SC control adjusts the difference between the liquid temperature in indoor unit and condensation temperature in
a system (Tc).
SC = Condensation temperature (Tc) - liquid temperature (E1)
Target SC is 9deg F ~ 27deg F (5deg C ~ 15deg C) according to operating condition.
*3 MOV pulse changes to 55 for 1 minute when valve pulse continues to be 55 or more 5 minutes.
The purpose is to decrease the flow volume of the refrigerant so that room temperature can be detected with less
influence of heat from the refrigerant.
*4 Only for Concealed Duct - High Static Type Indoor Unit (Type E1)
In case of special controls, MOV performs special operation. For details, see the sections "7. Tube Refrigerant
Recovery Control", "8. Oil Control", "9. Defrost Control", "10. Discharge Tube Accumulated Refrigerant Recovery
Control".
Thermostat
ON/OFF
- 20 pulses
- 20 pulses
- 20 pulses
- 20 pulses
- 20 pulses
ON 60 ~ 480 pulses
OFF 20 pulses
- 20 pulses
ON 65 ~ 480 pulses
OFF 55 ~ 80 pulses
OFF *4 20 pulses
1 - 23
(SH control *1)
(SC control *2)
(Accumulation prevention of refrigerant *3)
3WAY VRF SYSTEM
Control Functions
1
2
3
4
5
6
7
8
9