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81 

1  The compressor will not start for three minutes after stop of operation. 

1  Once the compressor starts operation, it will not stop its operation for 30 seconds. 
2  However, it can be stopped using control panel at indoor unit. 

1  When the outdoor running current exceeds X value, the compressor frequency will decrease. 
2  If the outdoor running current does not exceed X value, the compressor frequency will return to normal 

operating frequency. 

3  If the outdoor running current continue to increase till exceed Y value, compressor will stop, and if this occurs 

3 times within 20 minutes, system will stop operation and OFF/ON control panel LED will blink (F16 error 
occurs). 

 

 

UD07FE5 

UD09FE5 

Operation Mode 

X (A) 

Y (A) 

X (A) 

Y (A) 

Heating 

21.0 

27.9 

22.8 

27.9 

Cooling 

13.8 

27.9 

14.5 

27.9 

 

A.  DC Peak Current Control 

1  When the current to IPM exceeds set value of 34 A, compressor will stop. Compressor will restart after three 

minutes. 

2  If the set value exceeds again for more than 30 seconds after the compressor restarts, operation will restart 

after two minutes.  

3  If the set value exceeds again for within 30 seconds after the compressor restarts, operation will restart after 

one minute. If this condition repeats continuously for seven times, system will stop operation and OFF/ON 
control panel LED will blink (F23 error occurs). 

  The compressor operating frequency is regulated in accordance to compressor tank temperature as shown in 

below figures. When the compressor tank temperature exceeds 107°C, compressor will stop, and if this occurs 4 
times within 30 minutes, system will stop operation and OFF/ON control panel LED will blink (F20 error occurs). 

 

Compressor = OFF

Free

110°C

108°C

Compressor tank temperature

97°C

112°C

97°C

97°C

Compressor

Frequency Reduced

Compressor

Frequency Maintain

 

 

 
 
 
 
 
 

82 

  When all the below conditions comply, the minimum compressor frequency will change to lower frequency. 
 

Temperature, T, for: 

Heating 

Cooling 

Outlet water (°C) 

T < 14 or T ≥ 48 

T < 14 or T ≥ 30 

Outdoor air (°C) 

T < 4 or T ≥ 24 

T < 13 or T ≥ 38 

Indoor heat exchanger (°C) 

T ≥ 0 

T < 30 

  Purpose: 

- To protect the system operation. 

  Detection period: 

- After compressor on for 1 minute. 

  Detection conditions: 

- When abnormal high voltage detection, 5 V or when open circuit detection 0V for 5 seconds continuously. 

  After detection: 

- When abnormality is detected 4 times within 120 minutes, unit stop operation. 
- OFF/ON control panel LED will blink (H64 error occurs). 

 

23°C

21°C

14°C

12°C

-25°C

-28°C

Compressor stop

Outdoor temperature

Max.

current

value is

regulated

 

  Purpose: 

- For compressor protection during low outdoor ambient operation (during heating low temperature operation). 

  Control content: 

a.  Trigger heater START condition 

o

 

When the outdoor air temperature is below than 5°C, and discharge temperature is 11°C or below. 

b.  Resetting heater STOP condition 

1. 

When the outdoor air temperature exceeds entry condition (2°C) 

2. 

When the discharge temperature exceeds entry condition (5°C) 

83 

The maximum current value is regulated when the outdoor air temperature rises above 14°C in order to avoid 
compressor overloading. 

When outdoor pipe temperature and outdoor air temperature is low, deice operation start where outdoor fan motor 
stop. 
 

  Deice judging condition 

 

-30

-30

-20

-10

0

10

20

30

-25

-20

-15

-10

-5

0

5

10

O

D

 P

ip

e 

T

e

m

p

e

rat

u

re 

(°

C)

Outdoor Unit Deice Control

line for continuous 3 minutes

and Pipe Temperature below this

When Heating Time > 35 minutes

Outdoor Temperature (°C)

3. Heating accumulation time

1. Outdoor air sensor temp.

2. Outdoor pipe sensor temp.

 

 
Deice operation time diagram 
 

a.  Deice mode 1 control: 

 

OD fan

ID pump

Expansion valve

Four way valve

Compressor

Free

Free

ON

OFF

OFF
ON

ON

Free

5

7

6

4

9

8

3

2

1

ON

ON

Free

Free

max 9 minutes 30 seconds

deice 1

 

 

84 

  The Compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the 

diagram below. 

  This control will begin 1 minute after the compressor starts. 

  Compressor frequency will adjust base on outdoor air temperature. 
 

 

 

1  When indoor heat exchanger temperature is lower than 0°C continuously for 10 seconds, compressor will 

stop operating. 

2  Compressor will resume its operation three minutes after the indoor heat exchanger is higher than 1°C. 
3  Indoor heat exchanger freeze prevention (H99) will memory in error history. 
4  in error history.