DOWNLOAD Panasonic WH-MXC16G9E8 Service Manual ↓ Size: 10.68 MB | Pages: 127 in PDF or view online for FREE

81 

 

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

 

 

b.  Deice mode 2 control: 

 

OD fan

OD fan

Main

Expansion valve

Bypass

Expansion valve

Four way valve

Sequence

Pump

Gas Bypass SV

Compressor

Deice mode 2

max 30 minutes

Normal

Deice

4~6

OFF

ON

ON

OFF

OFF

0

ON

ON

OFF

Free

Free

Free

Free

ON

OFF

OFF

1

2

3

4

5

6

7

8

Heating

operation

 

 

82 

  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. 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

83 

1.  Remove the 5 mounting screws as shown in the illustration. 
2.  Slide the cabinet front plate downward to release the pawls. 

Then, pull it toward front to remove it. 

 

Cabinet Front Plate

Mounting screws

Mounting

screws

 

1.  Remove the 11 mounting screws as shown in the illustration. 
2.  Lift the cabinet top plate upward to remove it. 

 

Cabinet Top Plate

Mounting

screws

 

1.  Fill up the Tank Unit with water. For details refer to Tank Unit installation instruction and operation instruction. 
2.  Antifreeze agent must be added into water circuit to prevent freezing of water when outdoor ambient 

temperatures is low. Recommended antifreeze: Propylene glycol: 40% (equivalent to -20°C) 

3.  Set ON to the Mono bloc unit and RCCB. Then, for remote control operation please refers to (Mono bloc) Air-

to-Water Heatpump’s operation instruction. 

4.  For normal operation, pressure gauge reading should be in between 0.05 MPa and 0.3 MPa. If necessary, 

adjust the water pump speed accordingly to obtain normal water pressure operating range. If adjust water 
pump speed cannot solve the problem, contact your local authorized dealer. 

5.  After test run, please clean the external filter. Reinstall it after finish cleaning. 

 
 
 
 
 

84 

  Strictly follow the steps below for proper pump down procedure. Explosion may occur if the steps are not 

followed as per sequence. 
1.  Press the “SERVICE” switch on remote control to enter SERVICE mode. Operate the system in Sr : 01 mode 

for pump down operation. 

2.  After 10~15 minutes, (after 1 or 2 minutes in case very low ambient temperatures (< 10°C)), fully close 2 way 

valve. 

3.  After 3 minutes, fully close 3 way valve. 
4.  Press the “OFF/ON” switch on remote control to stop pump down operation. 
5.  Remove the refrigerant piping. 

 

 

Before adjust the water flow rate, make sure that the total water volume in the installation is 50 litres minimum for 
heating side. The default setting is SPEED 6 for WH-MXC16G9E8. Please ensure the minimum flow rate is not less 
than 13 l/min and not more than 50 l/min. 
The available external static pressure (kPa) in function of the water flow rate (l/min) is shown in the P-Q graph. 
Depend on the hydraulic system pressure loss and type, the water flow rate can be adjusted by remote control. 

1  When the Air-to-Water Heatpump is in stop operation, press SERVICE button for 5 seconds. 
2  Press  /  button to select menu S02 (PUMP SPEED ADJUST MODE) and press SET button to confirm the 

menu. 

3  Press SELECT button then press  /  button to change pump speed and press SET button to confirm the 

pump speed. 

4  Press OFF/ON button to exit PUMP SPEED ADJUST MODE. 

During PUMP SPEED ADJUST MODE, we can select AIR PURGE function by pressing FORCE button. 
In AIR PURGE function, the pump will operate ON and OFF for 10 minutes to purge the air in the hydraulic system. 
Press again the FORCE button to exit AIR PURGE function. PUMP SPEED ADJUST 
MODE will stop operation. 
 

0

10 13 20

30

40

50

60

70

1

2

3

4

5

6

7

110

120

130

100

90
80
70
60
50
40
30
20
10

0

WATER FLOW RATE (L/min)

EXTERNAL STAT

IC PRESSURE 

(kPa)

N

O

T 

AP

PL

IC

AB

LE

 R

AN

GE

N

O

T 

AP

PL

IC

AB

LE

 R

AN

GE

 

 

  Expansion Vessel with 10 L air capacity and initial pressure of 1 bar is installed in this Mono bloc unit. 

  Total amount of water in system should be below 200 L. 

(Note: This amount of water is not include the tank unit volume) 

  If total amount of water is more than 200L, please install additional expansion vessel (field supply). 

  Please keep the installation height difference of system water circuit within 10 m. 

(Inner volume of same Mono bloc unit is about 5 L)