Friedrich MRM09Y1J, Service & Parts Manual

Page: 33 / 135

33 PB
OPERATION
9-12k Sequence of Operation
FCG 3
FCG 2
FCG 1
TCG1
TCG2
TCG3
88
64
48
240
360
180
TCG 1sec TCG 2sec TCG 3sec
Frequency
Time
FCG3
FCG2
FCG1
Frequency Control
When starting the compressor, or when room conditions change;
frequency will be initialized according to the
T value of the indoor unit and the Q value of the indoor unit. Q value: Indoor unit output
P Signal)
2. P control
P value every 20 seconds, and adjust the frequency according to its difference from the frequency previously calculated.
D value.
When the D value is smaller; lower the frequency.
When the D value is larger; increase the frequency.
Discharge Pipe Control
The discharge pipe temperature is used as the compressor’s internal temperature. If the discharge pipe temperature rises above a
certain level, the operating frequency upper limit is set to keep this temperature from going up further
.
discharge pipe
thermistor
Stop zone
temperature
Droping zone
Keep zone
Up zone
Reset zone
3-minutes Standby
Prohibits compressor start for 3 minutes after turning it of f.(except when defrosting)
Compressor Protection Function
When turning the compressor from OFF to ON, the upper limit of frequency must be set as follows. (The function must not be used
when defrosting.)
3.Frequency management when other controls are functioning. When frequency is droping; Frequency management is carried out only
when the frequency drops. For limiting lower limit Frequency management is carried out only when the frequency rises.
4.Upper and lower limit of frequency by PI control. The frequency upper and lower limits are set depending on indoor unit. When lo w
noise commands come from the indoor unit or when outdoor unit low noise or quiet commands come from indoor unit, the upper limit
frequency must be lowered than the usual setting.
3. I control
If the operating frequency does not change more than a certain fixed time, adjust the frequency up and down according to the
determined from indoor unit size, air flow rate and other factors
1. PI Control
(Determine Frequency Up / Down by
Calculate