Friedrich MRM09Y1J, Service & Parts Manual

Page: 36 / 135

36 PB
OPERATION
9-12k Sequence of Operation
Fan OFF delay for 60 seconds must be made when the compressor is stopped.
Refrigerant Recovery Function
3. Fan OFF delay when stopped
4. ON/OFF control in cooling operation
5. Tap control when dropping function is working
6. Fan control in forced operation
7. Fan control in indoor/outdoor unit silent operation
8. Fan control in powerful mode
9. Fan control in normal operation
Fan OFF Control when Stopped
1. When Cooling Operation
When the outdoor air temperature is lower than 99°F, the fan tap must be set to vane posiiton L.
2. When Heating Operation
When the outdoor air temperature is higher than 39°F, the fan tap must be turned to vane position L (only for heat pump model).
Compulsive Defrost Function
(1) Enter refrigerant recovery function
Within 5 minutes after energizing (ON or OFF), continuously press LIGHT button for 3 times within 3 seconds to enter refrigerant
recovery mode; Fo is displayed on the indoor unit and refrigerant recovery function is started. Close the liquis valve. After 5 minutes
the large pipe valve should read 0 psi or less on a refrigerant manifold. If there is more than 25 ft of refrigerant lines set, the remaining
refrigerant may need to be reclaimed with a refrigerant recovery machine. In either case, close the large pipe service valve and
immediately set the mode to off on the indoor unit. Recover remaining refrigerant unti 0psi or less is achieved. Remove the refrigerant
lines.
(2) Exit refrigerant recovery function
After entering refrigerant recovery mode, when receive any remote control signal or refrigerant recycling mode for 25min, the unit
will exit refrigerant recovery mode automatically If the unit is in standby mode before refrigerant recovery, it will be in standby mode
after finishing refrigerant recovery; if the unit is ON before refrigerant recovery, it will still return to it’s original operation mode.
(1) Start up compulsory defrosting function
Turn unit on, set to heating mode with remote controller and adjust the temperature to 61 oF(16oC). Press “+, -, +, -, +,-” buttons
successively within 5 seconds and the unit will enter into compulsory defrost status. H1 will be shown on the indoor display
If the unit malfunctions or stops operation due to protection, compulsory defrost function can be resumed after
malfunction or protection is released.
(2) Exit compulsory defrost mode
After compulsory defrost is started, the unit will exit defrost operation according to the defrost conditions listed above, and
the unit will resume normal heating operation.
Fan Control
Fan control is carried out according to the following priority
1. Fan ON contol for electric component cooling fan
2. Fan control when defrosting