57
8-4. FAN operation
1. Compressor
2. Fan
3. Four way valve
Control modes
Remarks
Control details
Always OFF
Always OFF
Always OFF
8-5. Defrosting operation
1. Start
Control modes
Remarks
Control details
w
Refer to the
table of “Defrosting
prohibition time”
on this page.
1-1. Requirements for starting
Defrosting starts when either of below conditions is satisfied.
(Conditions)
a. In HEAT operation and when the outdoor liquid pipe temp.(TH3) continues to
be -2
:
or less for 7 minutes after the compressor integrating operation time
fulfils defrosting prohibition time (T1
w
).
b. In HEAT operation and when the outdoor liquid pipe temp.(TH3) continues to
be -5
:
or less for 7 minutes after the compressor integrating operation time
fulfils defrosting prohibition time (T3
w
).
c. In HEAT operation and when the outdoor liquid pipe temp.(TH3) continues to
be -2
:
or less for 3 minutes after the compressor integrating operation time
fulfils the defrosting prohibition time (T1
w
) and the compressor stops twice
within 10 minutes from its start-up.
d. In HEAT operation and when the outdoor liquid pipe temp.(TH3) continues to
be -5
:
or less for 3 minutes after the compressor integrating operation time
fulfils the defrosting prohibition time (T3
w
) and the compressor stops twice
within 10 minutes from its start-up.
(Complementary explanation)
The (a) indicates the defrosting operation with the frost amount light.
The (b) indicates the defrosting operation with the frost amount heavy
The (c) indicates the defrosting operation in case the thermostat is turned on/off
frequently because the frost amount is small and the air-conditioning load is heavy.
The (d) indicates the defrosting operation in case the thermostat is turned on/off
frequently because the frost amount is large and the air-conditioning load is light.
2. Stop
1-2. Actuator at the beginning of defrosting operation
Actuator will be activated by the following procedure if any of the above
conditions is detected.
1
Compressor operating frequency will get down to 30Hz.
2
When the compressor operating frequency becomes 30Hz;
• Four way valve will be turned off.
• Outdoor fan will be stopped.
• Both LEV A and B opening pulse are set to 480.
After
1
and
2
are completed, the compressor will be set to the defrosting
operation frequency.
2-1. Requirements for ending
Defrosting stops when any of the following conditions is satisfied.
(Conditions)
a. 15 minutes have passed since the defrosting operation started.
b. The outdoor liquid pipe temperature (TH3) has become 20
:
or more within 2
minutes from the start of defrosting operation.
c. The outdoor liquid pipe temperature (TH3) has become 8
:
or more after the
defrosting operation is conducted for 2 minutes.
d. During defrosting operation, the compressor has been stopped due to errors
or something.
e. During defrosting operation, the operation mode except HEAT has been
selected by remote controller.
Model
name
Frequency
Defrosting operation
frequency
PUHZ-RP1.6VHA
PUHZ-RP2VHA
PUHZ-RP2.5VHA
PUHZ-RP3VHA
PUHZ-RP4VHA
PUHZ-RP5VHA
PUHZ-RP6VHA
80Hz
80Hz
80Hz
80Hz
80Hz
80Hz
80Hz
Continued to the next page.
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