Specifications

74
Control mode
Mode Function
RemarksControl
Bypass
valve control
Only PUH–
P5,6YGA
ON/OFF
condition
ON condition
• Start up at outdoor piping temperature (TH3)
]12˚C, after resetting or since 30 minutes has
passed after the compressor OFF.
• Start up at room temperature (TH1) ] 22˚C.
• When the following abnormalities are detected
during the heat compressor operation.
1Abnormal discharging temperature (U2)
2Abnormal high pressure (U1)
3Breaking of the compressor over current
(lock)(UF)
4Breaking of the compressor over current (U6)
• When either below 1 or 2 is satisfied during the
heat compressor operation.
1Indoor Cond./Eva. temperature (TH5)]CTa+2˚C
2Discharge temperature (TH4)]Tda+15˚C
•When restarting within 30 minutes since the heat
compressor stops, the solenoid valve (SV) is
ON at the compressor OFF.
OFF condition
When “Indoor condenser temperature
(TH5) [ 54˚C” or “Outdoor discharging
temperature (TH4) [ 105˚C” since 15
minutes has passed after the solenoid
valve ON.
model
PUH–P5YGA
–P6YGA
CTa [˚C]
55
55
Tda [˚C]
95
95
CTa : Condensing temperature
Tda : Discharge temperature
Operation mode
change
• When the mode changes HEAT ➔ COOL.
4-way valve
control
Normal operating
OFF ordinary during normal operation
Defrosting
OFF ordinary during defrosting.
• When the mode changes HEAT ➔ OFF.
4-way valve
HEAT COOL
ON
OFF
ON
OFF
Compressor
4-way valve
10 minutes
ON
OFF
Heat
OFF
Operation mode
When becoming to be the following, the LEV opening is fixed during the fixed time.
1 When the compressor stops.
The LEV opening is determined with the unit operating state before the compressor stops
and the capacity.
2 When the compressor starts.
The LEV opening is determined by the operating state, the temperature of the ambient air,
and the capacity.
3 When detecting temperature-rise over.
When detecting over rise of the condensing temperature and the discharging temperature
because of an increase in the load etc. during operation.
The LEV opening is different according to the operating state and the capacity.
W Detecting the condensing temperature HEAT : TH5
W Detecting the discharging temperature COOL/HEAT : TH4
4 Defrosting
When defrosting, the LEV opening is fixed. Also the opening is different according to the
capacity.
W Detecting the defrosting : TH3
LEV control
Opening in the startup (Normal operation)
P1
P1.6
P2
P2.5
500
600
500
600
500
600
500
600
P3
P4
P5
P6
800
800
1000
1500
600
600
1000
1500
Model 1 min. from startup 1-3 min. 1 min. from startup 1-3 min.Model
The opening is fixed for three minutes from the startup.
Fixed control
OCT03-E-3.qxp 04.3.26 1:50 PM Page 74