RO06
R005
R004
R003
R002
R001
7.1.3 Interface drawing and definition of the extended module
The description of the input and output interface of the extended module is as follows
AI/DI01
AI/DI02
AI/DI03
AI/DI04
AI/DI05
AI/DI06
AI/DI07
AI/DI08
0~5V_IN1
0~5V_IN2
0~5V_IN3
0~5V_IN4
+5V
(Temperature of the EVI inlet of system 2)
(Temperature of the EVI oulet of system 2)
+5V
AI 10(50K)
GND
AI 9(50K)
CN1
CN2
CN3
Reserved
Ground
Electronic expansion valve A
Electronic expansion valve of EVI in
system 2
JP4
JP3
A
I/
D
I
1
A
I/
D
I
2
A
I/
D
I
3
A
I/
D
I
4
A
I/
D
I
5
A
I/
D
I
6
A
I/
D
I
7
A
I/
D
I
8
0
-5
V
_
IN
1
0
-5
V
_
IN
2
0
-5
V
_
IN
3
0
-5
V
_
IN
4
+
5
V
G
N
D
G
N
D
G
N
D
G
N
D
G
N
D
G
N
D
G
N
D
G
N
D
G
N
D
G
N
D
G
N
D
G
N
D
G
N
D
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
1
3
CN3
CN2
CN1
4 GND
3 AI 10(50K)
2 GND
1 AI 9(50K)
1
2
3
4
5
4
3
2
1
5
4
3
2
1
4-way valve
Water pump
Fan 2 / Fan low speed
Compressor 1
Compressor 2
Fan 1 / Fan high speed
System 2 fan coil temperature
Temperature 2
System 2 suction temperature
System 2 pressure sensor
System 2 compressor current detection
System 2 Exhaust temperature
System2 Antifreeze 1 Temperature
System2 Antifreeze 2 Temperature
System2 Antifreeze 3 Temperature
System2 Antifreeze 4 Temperature
System 2 the high-preesure switch
System 2 the low-preesure switch
Communication port
Reserved
Reserved
41
42
43
44
45
46
The main controller terminals
29
7.2 Common observation
Look over and clear the failure according to below information.
Failure
Possible causes for the failure
Solutions
Heat pump
cannot
be started
1 Wrong power supply
2 power supply cable loose
3 circuit breaker open
1 shut off the power and check power supply;
2 check power cable and make right connection
3 check for the cause and replace the fuse or
circuit breaker
Water pump is
running with
high noise or
without water
1 lack of water in the piping
2 much air in the water loop
3 water vavles closed
4 dirt and block on the water filter
1 check the water supply and charge water
to the piping;
2 discharge the air in the water loop;
3 open the valves in water loop;
4 clean the water filter.
Heat pump
capacity is low,
compressor
do not stop
1 lack of refrigerant;
2 bad insulation on water pipe;
3 low heat exchange rate on air side
exchanger;
4 lack of water flow
1 check for the gas leakage and recharge the
refrigerant;
2 make good insulation on water pipe;
3 clean the air side heat exchanger;
4 clean the water filter
High compressor
exhaust
1 too much refrigerant
2 low heat exchange rate on air side
exchanger
1 discharge the redundant gas
2 clean the air side heat exchanger
Low pressure
problem
of the system
1 lack of gas
2 block on filter or capillary
3 lack of water flow
1 check the gas leakage and recharge freon;
2 replace filter or capillary;
3 clean the water filter and discharge the air in
water loop.
Compressor do
not run
1 power supply failure
2 compressor contactor broken
3 power cable loose
4 protection on compressor
5 wrong setting on return water temp.
6 lack of water flow
1 check off the power supply;
2 replace compressor contactor;
3 tighten the power cable;
4 check the compressor exhaust temp.;
5 reset the return water temp.;
6 clean the water filter and discharge the air in
water loop.
High noise of
compressor
1 liquid refrigerant goes into compressor
2 compressor failure
1 bad evaporation, check the cause for bad
evaporation and get rid of this;
2 use new compressor;
Fan do not run
1 failure on fan relay
2 fan motor broken
1 replace the fan relay;
2 replace fan motor.
The compressor
runs but heat
pump has not
heating or
cooling capacity
1 no gas in the heat pump;
2 heat exchanger broken;
3 compressor failure.
1 check system leakage and recharge refrigerant;
2 find out the cause and replace the heat
exchanger;
3 replace compressor.
Low outlet water
temperature
1 low water flow rate;
2 low setting for the desired water temp.;
1 clean the water filter and discharge the air in
water loop.
2 reset the desired water temperature.
Low water flow
protection
1 lack of water in the system;
2 failure on flow switch
1 clean the water filter and discharge the air in
water loop.
2 replace the flow switch.
30
The main controller terminals
KZ10
