Friedrich MRM09Y1J Service & Parts Manual

34 PB
OPERATION
9-12k Sequence of Operation
2 Hz dropping
1.0 second after
crossing the
dropping zone
After 2.5 seconds
Compressor stops
Reset zone
Stop zone
Dropping zone
Keep zone
1
2
3
Key
1.Conditions for starting freeze protection
Judge the controlling start with the indoor heat exchanger temperature after 2 seconds from operation start.
2.Control in Each Zone
Input Current Control
Detect an input current by the CT while the compressor is running, and set the frequency upper limit from such input current.
In case of heat pump model, this control is the upper limit control function of the frequency which takes priority of the lower limit
reversing valve operation activating compensation.
The frequency control will be made within the following zones.
Control contents
When a “stop current” continues for 3 seconds after crossing the stop zone, the compressor operation stops.
If a “dropping current” continues for 1.0 second after crossing the dropping zone, the frequency will be 2 Hz drop.
Repeating the above dropping continues until the current crosses the dropping zone without change.
In the keep zone, the frequency limit will remain.
In the return / reset zone, the frequency limit will be cancelled.
Limitation of current dropping and stop value according to the outdoor air temperature
1. In case the operation mode is cooling
* The current drops when outdoor air temperature becomes higher than a certain level (varies by model).
2. In case the operation mode is heating
* The current drops when outdoor air temperature becomes higher than a certain level (varies by model).
Freeze Protection Control
During cooling operation, the signals being sent from the indoor unit allow the operating frequency limitation and then prevent freezing
of the indoor heat exchanger. (The signal from the indoor unit is divided into the zones below.)
Zone
Stop zone
Dropping zone Start the timer, and the frequency will be dropping.
Keep zone Keep the upper limit of frequency.
Return / Reset zone Cancel the upper limit of frequency.
When the temperature reaches the stop zone, stop the compressor and
correct abnormality.
Heat exchanger
thermistor temperature
A
B
C
D
E
Return/Reset zone
Up zone
Keep zone
Dropping zone
Stop zone

Friedrich MRM09Y1J Specifications

General

Brand	Friedrich
Model	MRM09Y1J
Category	Air Conditioner
Language	English