Gree GWHD(28)NK3FO, Руководство по обслуживанию

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Technical Information
Service Manual
Detection of the quantity of installed indoor units: after 3min of energizing, if the outdoor unit does not receive the communication data of
certain indoor unit, the outdoor unit will judge that indoor unit is not installed. If the outdoor unit receives the communication data of that
indoor unit later, the communication malfunction will be cleared.
5) System high-pressure protection
a. When the high-pressure switch detects the system pressure higher than limit ,then the high-pressure switch cuts off, the system will stop
to run.
b.If high-pressure protection is detected for two times within one hour, only by cutting off the power and then reenergize that the compressor
can restart.
6)System low-pressure protection
a. When the low-pressure switch detects the system pressure lower than limit ,then the los-pressure switch cuts off , the system will stop to
run.
b. If low-pressure protection is detected for two times within one hour, only by cutting off the power and then reenergize that the compressor
can restart.
7) Compressor overload protection
No matter the compressor is on or off, when the compressor overload switch is detected activated, the system will stop and indoor unit
will display H3. If the compressor overload protection appears for more than 6 times, in this case, only by cutting off the power and then
reenergize that the compressor can restart. If the running duration of the compressor is longer than 30min, the protection times will be
cleared to zero.
3.Other function
1) Refrigerant Recovery
When the unit is powered on and runs under the COOL mode, it is available within five minute to go the refrigerant recovery mode by
pressing three times the “LIGHT” button on the wireless controller in three seconds with “Fo”displayed.
How to quit the refrigerant recovery:
When the refrigerant recovery has started, it will quit when there is a signal from the wireless controller or it has run for ten minutes.
2) Setting function of master/slave indoor unit
Picture of DIP switch on outdoor mainboard :
SA1(5-bit): dial-switch for master/slave indoor unit,
SA2(2-bit): dial-switch for mode locking (not for wall mounted indoor units)
5-bit dial-switch to set master/slave indoor unit: it is corresponding to indoor units of no.1 to no.5. Dial the switch to ON(master side. Right
side) to set that indoor unit as master indoor unit , and dial the switch to slave side(left side) to set indoor unit as slave indoor unit. There
can be only one master unit in a system, If more than one indoor units are set as master unit, the unit with biggest number is the master
unit. (biggest number here means number 1 to number 5 on the switch)
2-bit dial-switch to set mode locking
(note:
1.only use no.1 bit. no.2 bit is for future use
2.this function is only for duct and cassette unit, not for wall mounted unit:
Locked mode: Switch no.1 bit to “ON”side(lock side, or right side on the picture): even the master indoor unit is off, the system will run
according to the mode before the master unit off.
Unlocked mode: Switch no.1 bit to left side on the picture: If the master indoor unit is off , the system will not care what the master unit
mode was, it will run according to the mode of the first turning on slave indoor unit.
Note: For wall-mounted indoor unit, unlocked model is default, and locked mode is invalid.
SA1
SA2
master/slave