Compressor Discharge Temperature Control; Condenser Temperature Control; Compressor Restart Delay Control; Outdoor Residual Heat Removal Control - Panasonic S-22KA1E5 Service Manual

14.5

Compressor Discharge Temperature Control

•
This control will operate if compressor discharge temperature is detected hot at alert level.
If Compressor Discharge Temperature 100°C, liquid bypass valve will open.
o
If Compressor Discharge Temp 105°C, compressor frequency will reduce 10% if the compressor discharge
o
temp still at down zone.
•
The compressor frequency will only reduce max 2 times with 3 minutes interval OR to minimum frequency.
•
If compressor already reduced to minimum level but temp still at down zone, gas bypass valve will opens.
14.6

Condenser Temperature Control

•
During Heating operation only, this control will start if below conditions are fulfilled:
Total capacity of thermostat ON indoor units maintain for 10 minutes
o
None of the indoor units' heat exchanger > 40°C
o
•
Every interval of 60 sec, compressor frequency will increase 20% if the indoor heat exchanger temperature still in
up zone.
•
The compressor frequency will only increase maximum 5 times OR up to maximum frequency
•
This control will be ignored if any of the following control activated:
Deice
o
Low Load
o
Overload
o
Compressor Discharge Temperature Control
o
Total Current Protection
o
Night Time Low Noise Control
o
14.7

Compressor Restart Delay Control

•
Compressor only can be startup after at least 3 minutes of compressor OFF.
•
During this control, compressor cannot restart and gas bypass valve is ON.
14.8

Outdoor Residual Heat Removal Control

•
When compressor OFF, outdoor fan operate for 1 minute to remove the remaining heat.
14.9

Compressor Stops Control

•
This control ensures compressor is stopped within 30 seconds during normal operation.
•
If compressor stop is due to protection control, compressor will stop immediately.
•
Outdoor fan motor will continue to run at maximum speed for 60 seconds after compressor OFF signal is
received.
•
Gas bypass valve will ON for 3 minutes once received compressor OFF signal.
Liquid Bypass Valve Control Liquid Bypass Valve Control
Open Open
Close Close Unchanged Unchanged
(ON) (ON)
(OFF) (OFF) zone zone
o o
o o
80 80 C C
100 100 C C
Up Up
zone zone
Normal Control
Comp Stop Signal
Comp Frequency Control Comp Frequency Control
Unchanged Unchanged
Free Free
zone zone
Zone Zone
o o
90 90 C C
Unchanged Unchanged Free Free
zone zone zone zone
o o o o
40 40 C C 45 45 C C
Max 30sec
Time (Sec)
86
Comp Comp
Down Zone Down Zone
Stop Stop
o o o o
105 105 C C 110 110 C C