Air Source Heat Pump EAP range user manual - www.ecoairpump.co.uk
INSTALLATION/OPERATING/ MAINTENANCE
INSTRUCTIONS
Air to Water Heat Pump
EAP-10.5XS EAP-13XS EAP-18DS
www.ecoairpump.co.uk
Support Line: 08444 930099
Email: Info@ecoairpump.co.uk
Air Source Heat Pump EAP range user manual - www.ecoairpump.co.uk
1. READ IMMEDIATELY
1.1. Important Information
Prior to opening the unit it must be ensured that all electrical circuits are disconnected from the power supply.
During transport, the heat pump must not be tilted more than 45 (in either direction).
The intake and outlet openings must not be restricted nor obstructed.
Do not use any cleaning agents containing sand, soda, acid or chloride as these may damage the surface.
To prevent consequential damage it is imperative that the water circuit be neutralized after cleaning using appropriate
agents.
The unit is not suitable for frequency converter operation.
Work on the refrigeration circuit may be performed by qualified persons only.
1.2. Legal Provisions and Guidelines
This heat pump was designed and built in compliance with all relevant EU directives, DIN and VDE regulations (see EC Declaration
of Conformity). The electrical connection of the heat pump must be performed according to and conforming with all relevant VDE,
EN and IEC standards. Beyond that, all technical connection requirements of the local electrical utility company have to be
observed. On connecting the heating system, all relevant regulations have to be complied with.
1.3. Energy-Efficient Use of the Heat Pump
By purchasing this heat pump you contribute to the protection of the environment. A prerequisite for energy-efficient operation is the
proper design of the heat source system and the heat utilization system.
One of the most important factors of heat pump efficiency is keeping the temperature difference between the heating water and the
heat source as small as possible. It is therefore strongly recommended that the design of both the heat source system and the heat
distribution system be carried out with great care. A 1 Kelvin (1 C) higher temperature difference corresponds to an increase
in power consumption of approx. 2.5%. When designing the heating system care must be taken that special applications such as
domestic water heating are taken into consideration and dimensioned for low temperature operation. Heat pumps are optimally
suited for underfloor heating (surface/radiant heating) applications due to the low supply temperatures (30 C to 40 C).
During operation it is essential that the heat exchanger is not contaminated as this would increase the temperature difference
resulting in a lower coefficient of performance.
A considerable contribution to the economical operation is made by the heat pump controller provided it is set correctly. For more
detailed information refer to the operating manual of the heat pump controller.
2. PURPOSE OF HEAT PUMP
2.1. Application
The air to water heat pump is designed for use in existing or newly built heating systems.
The heat pump is designed exclusively for the heating of water for space heating and of domestic hot water!
The heat pump is suitable for both mono-energetic and bivalent operation at outdoor temperatures down to -20 C.
2.2. Principle of Operation
Ambient air is drawn in by the fan and passed over the evaporator (heat exchanger). The evaporator cools the air, i.e. it extracts the
heat it contains. In the evaporator, the heat removed is transferred to the working fluid (refrigerant).
With the aid of an electrically driven compressor, the absorbed heat is "pumped" to a higher temperature level through an increase
in pressure and given off to the heating water via the condenser (heat exchanger).
In so doing, the electrical energy is used to raise the heat of the environment to a higher temperature level.
Due to the fact that the heat energy extracted from the air is transferred to the heating water, this type of appliance is referred to as
an air to water heat pump.
The air to water heat pump consists of the following main components: Evaporator, fan and expansion valve as well as the
low-noise compressor, the condenser and the electric control unit.
In the case of low ambient temperatures, air humidity may accumulate on the evaporator in the form of frost impairing the heat
transfer. The evaporator is automatically defrosted by the heat pump, as required, with the possibility of vapor plumes forming at
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the air outlet, depending on the weather.
3. SCOPE OF DELIVERY
3.1. Baseline Unit
The heat pump is delivered as a compact unit containing the components listed below.
Copeland Scroll Compressor
Condenser ( 316 stainless steel brazed plate heat exchanger)
Evaporator
Alco Expansion Valve
Accumulator
Gas/Liquid Separator
4-way Reversing Valve
Defrost Heating Cable
The refrigerant used is R404A.
3.2. Control Box
The control box is integrated in the heat pump.
The control box houses the mains terminals as well as the power contactors and mainboard of the controller.
3.3. Heat Pump Controller
For the operation of your air to water heat pump, the heat pump controller included in the scope of delivery is to be used.
The heat pump controller is a comfortable electronic regulating and control unit. It controls and monitors the entire heating system
as a function of the outdoor air temperature, the hot water preparation and the safety devices.
Method of functioning and operation of the heat pump controller are described in the enclosed operating manual.
4. TRANSPORT
During transport, the heat pump must not be tilted more than 45 (in either direction).
The unit should be transported to the final installation site on a wooden pallet. The baseline unit can be transported either by means
of a lift truck, a sack trolley, or the like.
5. INSTALLATION
5.1. Positioning of the Unit
The unit should always be installed on a permanently level, smooth and horizontal surface.
The entire base frame should thereby make close contact with the floor in order to ensure adequate sound insulation and to prevent
water-carrying parts from cooling out. Failing this, additional insulation measures may become necessary. It must be possible to
carry out servicing work without any problems. This is ensured if a clearance of 1.2 m to solid walls is maintained.
5.2. Condensate Line
Large amounts of condensation water as well as melt water from defrosting can be produced. Provide good drainage at the
installation area and make sure water cannot run out onto paths or the like during periods that ice can form. Ideally condensation
water is led off to a drain or similar. The condensation water pipe must have a minimum diameter of 50 mm and should be
discharged to the sewer drain in a frost-proof location.
6. MOUNTING
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6.1. General Information
The following connections need to be made on the heat pump:
- supply/return lines of the heating system
- condensate drain
- control lead to the heat pump controller
- power supply
6.2. Heating-Side Connection
The connections on the heating side of the heat pump are provided with 1"external thread. The hoses to be connected exit the unit
through its side plate.
When carrying out the connections, use a wrench to counterhold at the transitions.
Before completing the heat pump connections on the heating water side, the heating installation must be flushed in order to remove
any impurities that may be present, residues of sealing agents, or the like. Any accumulation of residues and other deposits in the
condenser may result in reduced efficiency of the unit or a total failure of the heat pump. On systems equipped with heating water
flow shut-off devices such as radiator or thermostat valves, an overflow valve to be provided by the customer needs to be installed
at the outlet of the heating pump in a heating bypass. This assures a minimum heating water flow through the heat pump and
prevents any malfunctions from occurring.
Once the installation on the heating side has been completed, the heating system must be filled, deaerated and pressure-tested.
6.3. Anti-freeze Protection
On heat pumps installed in a location prone to frost, a manual drain valve should be provided.
Provided the controller and heating circulating pumps are ready for operation, the anti-freeze protection function of the controller is
active. If the heat pump is taken out of service or in the event of a power failure, the system has to be drained. In heat pump
installations where a power failure cannot be readily detected (holiday house), the heating circuit must contain a suitable antifreeze
product.
7. COMMISSIONING
7.1. General Information
To ensure proper commissioning it should be carried out by an after-sales service authorized by the manufacturer. Only then can
an extended warranty period of 2 years in total be granted.
7.2. Preparatory Steps
Prior to commissioning, the following items need to be checked:
- All connections of the heat pump must have been made.
- In the heating circuit all valves that could impair the proper heating water flow must be open.
- The air intake/discharge path must be unobstructed.
- The sense of rotation of the fan must correspond to the direction of the arrow.
- The settings of the heat pump controller must be adapted to the heating installation in accordance with the instructions contained
in its instruction manual.
- Proper condensate drainage must be ensured.
8. CLEANING / CARE
8.1. Care
To protect the paint finish, avoid placing objects against or on the unit. The external parts of the heat pump can be wiped with a
damp cloth and commercially available cleaning agents.
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Do not use any cleaning agents containing sand, soda, acid or chloride as these may damage the surface.
To prevent malfunctions in the heat exchanger of the heat pump caused by dirt deposits, care must be taken that the heat
exchanger in the heating installation cannot become contaminated. In the event that operating malfunctions due to contamination
occur nevertheless, the system should be cleaned as described below.
8.2. Cleaning of Heating Side
The ingress of oxygen into the heating water may result in the formation of oxidation products. An additional contamination of the
heating water caused by residues of lubricating and sealing agents occurs in many cases.
Both of the above causes may lead to a reduction in the performance of the heat pump condenser. In these cases the installer
needs to clean the condenser. Based on information known to date we recommend cleaning with a 5% phosphoric acid solution or,
in the case that cleaning needs to be performed more frequently, with a 5% formic acid solution. In either case, the cleaning fluid
should be at room temperature. Thorough flushing is necessary to ensure that all cleaning agent residues are removed from the
system. It is recommended that the heat exchanger is cleaned in the direction opposite to the normal flow direction. Owing to their
acid content flushing agents must be used with caution. To prevent acidic flushing agents from entering the heating installation
when cleaning the condenser, we recommend that the flushing device be mounted directly to the supply and return line of the heat
pump.
To prevent consequential damage it is imperative that the water circuit be neutralized after cleaning using appropriate
agents.
8.3. Cleaning of Air Side
Evaporator, fan and condensate drain should be cleaned of debris (leaves, branches, etc.) from time to time.
When cleaning do not use any sharp or hard objects so as to prevent any damage to the evaporator and the condensate pan.
9. MALFUNCTIONS /TROUBLESHOOTING
This heat pump is a quality product and is designed for troublefree and maintenance-free operation. In the event that a malfunction
occurs nevertheless, you will be able to correct the problem easily yourself in the majority of cases. Simply consult the Malfunctions
and Troubleshooting table in the operating manual of the controller. Malfunctions can be interrogated at the heat pump controller. If
the problem cannot be corrected by the user, please contact the after-sales service in charge. Any work on the heat pump may
only be performed by authorized and qualified after-sales service technicians.
Error
Code
Description
Possible Reason
Solution
E1
Inlet Water
Temperature
Sensor
Malfunction
1) The inlet water temperature sensor is
damaged
replace the sensor
E2
Evaporator Coil
Temperature
Sensor
Malfunction
1) The evaporator coil temperature sensor
is damaged
replace the sensor
E3
Ambient Air
Temperature
Sensor
Malfunction
1) The ambient air temperature sensor is
damaged
replace the sensor
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E4
Evaporator Coil
Temperature 1
Sensor
Malfunction
1) The evaporator coil temperature sensor
1 is damaged
replace the sensor
E5
Evaporator Coil
Temperature 2
Sensor
Malfunction
1) The evaporator coil temperature sensor
2 is damaged
replace the sensor
E6
Insufficient
Water Flow
Protection
1) Loop wire terminals 1 and 2 (no matter
whether water flow switch is installed) to
see if E6 still shows up. If yes, the
mainboard is defected.
Replace mainboard
2) The wires of water flow switch has a
poor contact to the mainboard.
Improve the contact
3) The water flow switch circuit is not
closed.
a. Check if there is water in the water
tank;b. if no in a, check if the water
pump is running;c. if no in b, check if
there is 220V volt supply to the water
pump; d. if no in c, mainboard is
defected. If yes in c, the water pump is
defected.
E7,E9
High Pressure
Protection
1) The water pump is too small. The
insufficient water flow results in gas
discharge temperature protection.
a. check if there is water flow from the
outlet; If no, check if the water pump is
defected;If water pump is defected,
replace it; b. start the unit and let it
operate for 15 minutes ( if it can).
Check if the temperature difference
between water inlet and outlet is bigger
than 5~7C. If yes, the water flow is too
small. Change to a bigger water pump.
c. If b is okay, check if there is
condensation water on the suction pipe
of the compressor. If no, there is a gas
leakage. Check where the leakage is.
Discharge the gas and solder the hole.
Then vaccumize the system and fill
gas. d. Start the unit, but do not give
power supply to the compressor. Check
if E7/E9 error code still shows up. If
yes, check if the 2.4~3.0Mpa high
pressure switch is disconnected. If yes,
replace it. If not, the mainboard is
defected. Replace the mainboard.
2) The water pump is installed in the
wrong direction or the three phase water
pump is running in the opposite direction.
3) Air exists in the water pump.
4) The particle filter on the inlet water pipe
is blocked.
5) The pipe diameter is too small or there
is a bottleneck restriction.
6) Insufficient refrigerant in the system so
that the compressor discharge temp is
higher than 110C
7) The high pressure switch is damaged
8) The thermo switch has a poor contact to
the mainboard.
9) The thermo switch is damaged.
10) The mainboard is damaged.
E8,E10
Low Pressure
Protection
1) All gas has leaked out.
a. Check the readings of high pressure
and low pressure manometers. If the
readings are 0, all gas has leaked out.
Check where the hole is and solder it.
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2) The low pressure switch is damaged
Vaccumize the system and fill the gas.
B. if the readings are above 0.9Mpa,
probably the 0.02~10.15Mpa low
pressure switch is defected. Replace
the switch.
Ice builds up on
the evaporator
but the system
cannot defrost it
properly.
1) Defrost cut-in temperature is set
incorrectly.
Set the defrost cut-in temperature as
factory default "-2℃ "
2) The evaporator coil temperature sensor
is placed in the wrong position.
Place the sensor on the second lowest
row of coil on the evaporator
3) The Ohm value of the evaporator coil
temperature sensor changes abnormally;
the sensor is damaged.
Replace the sensor
4) The defrost check valve or the defrost
capillary is blocked.
Replace check valve or capillary
5) The unit cycles on and off too often.
Hence the defrost delay time (P1)
condition is not satisfied.
Replace with a smaller heat pump;
Install a bigger buffer water tank in the
house heating system; increase set
water temperature difference (PA)
value.
Water
temperature
rises too slowly
1) The heat pump is undersized.
Size the correct model
2) The water tank is poorly insulated.
Insulate the water tank/pool properly
3) Water pipes are poorly insulated.
Insulate the water pipe properly
4) Mains water supply is unreasonable.
Redesign the mains water supply
5) The space between inlet water pipe and
outlet water pipe is too narrow, resulting in
water shortcircuit.
The space between inlet and outlet
water pipes should be no less than 1m
6) The heat pump is installed in a place
where the ventilation is not good.
Improve the ventilation
7) Insufficient refrigerant inside the
system.
Check where the leakage is and fill
refrigerant
Water pump and
fan motor is
running, but the
compressor
does not start
1) The phase sequence board in the
electrical box activates fault-phase or
lack-phase protection
Check if there is a lack-phase and put
the phase wire in the right position
2) Phase sequence board is damaged
Replace the phase sequence board
Heat pump does
not start properly
1) No power input
Plug in the power cord
2) Power voltage is not correct
Start the heat pump under the right
voltage
3) Power voltage drops when the unit is
started. The unit draws a huge current.
Low power capacity in the network;
Wires in wrong diameter (too small)
are used.
4) Fault-phase or lack-phase problem with
the mains power supply.
Put the phase wires in the right position
5) Poor contact problem with the wiring in
the system.
Improve the contact
6) The heat pump is in clock timer
shutdown state.
Check the clock timer settings. Reset
or cancel it.
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7) The system is in protection.
Check what kind of protection it is and
remedy it.
8) Damaged mainboard or damaged
temperature sensor.
Replace the mainboard or sensor
10. DIMENSIONED DRAWINGS
10.1. Dimensioned Drawing .. EAP-10.5XS EAP-13XS
Air Source Heat Pump EAP range user manual - www.ecoairpump.co.uk
11. EQUIPMENT DATA
Model
EAP10.5-XS
EAP-13XP
EAP-18DS
Outlet Water Rated Temp.(℃ )
35
Outlet Water Max. Temp(℃ )
58
A7/W35 EN14511
Heating Capacity
(KW)
10.3
11.9
18.5
COP
4.2
4.4
3.9
A2/W35 EN14511
Heating Capacity
(KW)
8.1
10.3
15.9
COP
3.4
3.9
3.5
A-2/W35 EN14511
Heating Capacity
(KW)
7.1
8.6
13.6
COP 3 3.3
3
A-7/W35 EN14511
Heating Capacity
(KW)
6.2
7.5
12.2
COP
2.7
2.9
2.8
Power Supply
230V/1HP/50HZ
Compressor Qty
1 1 2
Compressor Style
Copeland Scroll
Fan Motor Speed
Two
Refrigerant Type
R404A
Refrigerant Charge (kg)
2.5 3 4.4
Condenser
316 Stainless Steel Brazed Plated Heat Exchanger
Nominal Water Flow Rate A2/W35 (m3/h)
1.4
1.8
2.7
Flow restriction
Alco Thermal Expansion Valve
Pipe size (inch)
1"
Dimensions (mm) L*W*H
1080*470*960
Ambient Air Range
-20℃ -35℃
Noise dB(A)
52
53
55
Air Discharge
Horizontal
Weight (kg)
115
130
200
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12. WIRING DIAGRAMS
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13. Schematics of Installation
13.1. Schematics of Space Heating
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13.2. Schematics of Space Heating/Hot Water Heating
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14. Controller
Controller type: 15
This controller is applicable to both single compressor and dual compressors units.
This controller includes three parts: mainboard, control panel and connecting wires.
14.1. Mainboard Layout
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COMP1: Compressor 1
COMP2: Compressor 2
4WV1: 4-way Reversing Valve 1
4WV2: 4-way Reversing Valve 2
FAN1: Fan Motor, Low Speed
FAN2: Fan Motor, High Speed
PUMP: Water Pump
HOT: Backup Electricity Heater
A-HOT: Crankcase Heater
P-W: Solenoid for Hot Water
S-F: Solenoid for Defrost Heating Cable
ERR: Error Light
CN3 : Inlet Water Temperature Sensor
CN4 : Outlet Water Temperature Sensor
CN5 : Ambient Temperature Sensor
CN6 : Evaporator Coil Temperature 1 Sensor
CN7 : Evaporator Coil Temperature 2 Sensor
CN8 : Hot Water Temperature Sensor
CN9 : Gas Discharge Temperature 1 Sensor
CN10: Gas Discharge Temperature 2 Sensor
CN11: Control Panel
CN12: Assist Unit
COM: Common Port
EN: Interlock Signal
HP1: High Pressure Protection 1
LP1: Low Pressure Protection 1
HP2: High Pressure Protection 2
LP2: Low Pressure Protection 2
OV1: Compressor 1 Overload
OV2: Compressor 2 Overload
FLOW: Water Flow Switch
SET: Anti-freeze Protection
BUS: Comprehensive Protection
14.2. Jumper Settings
State
Function
Switch
Disconnected
Loop Wired
Remarks
JP1
Equipments Self-checkup. User regulation not
allowed. JP2
Both Systems Valid
System 1 Valid Only
JP3
Backup
JP4
Backup
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Jumpers 5, 6,7 and 8 are used to set Duty/Assist Unit No.
JP8
JP7
JP6
JP5
Unit
0 0 0
0
No. 1 ( Duty)
0 0 0
1
No. 2 (Assist)
0
0
1
0
No. 3 (Assist)
0 0 1 1 No. 4 (Assist)
0 1 0 0 No. 5 (Assist)
0 1 0 1 No. 6 (Assist)
0 1 1 0 No. 7 (Assist)
0 1 1 1 No. 8 (Assist)
1 0 0 0 No. 9 (Assist)
1 0 0 1 No. 10 (Assist)
X
X
X
X
Invalid
14.3. Control Panel
ON/OFF
Press ON/OFF to switch on/off the unit.
MODE
Press MODE to select the running mode.
Mode selection is valid only when the compressor is off.
Cooling Mode: the unit will cool the water till the water temperature reaches the set point.
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Heating Mode: the unit will heat the water till the water temperature reached the set point.
Auto Mode: the unit will cool the water till the water temperature reaches the set point, and automatically heat the
water till the water temperature reaches the set point.
Note: Hot water heating mode can only be activated in parameter setting.
RESET
When an error code is displayed on the screen, press RESET. If the error is rectified, the error code will disappear. If
the error is not rectified, the error code will remain on the screen.
▲
Press ▲to set the parameter value upwards by 1 degree or 1 min.
▼
Press ▼to set the parameter value upwards by 1 degree or 1 min.
When the unit is off, the user can hold ▼ for 5 seconds to enter forced defrost mode even if the defrost cut-in
conditions are not satisfied.
Note: to set water temperature for heating/cooling, switch on the control panel ( ON/OFF),
and then press ▲or ▼to adjust the set water temperature.
TIMER （24hours/7days）
Press TIMER and then ▲ ▼ to set unit automatic on/off time.
First Press: set HOUR digit for unit automatic on;
Second Press: set MINUTE digit for unit automatic on;
Third Press: set HOUR digit for unit automatic off;
Fourth Press: set MINUTE digit for unit automatic off.
Fifth Press: exit Timer state.
Note: when the set times are the same, the timer setting will become invalid.
Hold Timer Button for five seconds to set clock time.
First Press: set HOUR digit of the clock time.
Second Press: set MINUTE digit clock time.
Third Press: exit clock time setting.
Note: if no action is made in five seconds, the controller will exit setting state.
When both unit automatic on and automatic off times are set, every day the unit will run
according to this setting
LANG
Press this button to select the Unit Number for running parameters checkup (if multiple units are installed in one
project and modular control function is in use).
SET
Press SET button directly to check running parameters. If the unit No. shown on the display is “1”, the displayed
parameters are from the duty unit. Otherwise the displayed parameters are from the assist unit (depending on the Unit
Number set on LANG.
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14.4. Running Parameter Checkup
Duty Unit
Item
Parameter Name
Unit 1 Inlet Water Temp
℃
2
Outlet Water Temp
℃
3
Ambient Air Temp
℃
4
Evaporator Coil Temp 1
℃
5
Evaporator Coil Temp 2
℃
6
Hot Water Temp
℃
7
Discharge Gas Temp Compressor 1
℃
8
Discharge Gas Temp Compressor 2
℃
Assist Unit
Item
Parameter Description
Unit 1 Evaporator Coil Temp 1
℃
2
Evaporator Coil Temp 2
℃
3
Discharge Gas Temp Compressor 1
℃
4
Discharge Gas Temp Compressor 2
℃
5
Error?
Code
Hold SET for 10 seconds to enter parameter setting.
Press SET again to select the parameter item in sequence.
The first two digits stand for the parameter item number and the last two digits stand for the parameter value.
14.5. Screen Symbols
HEAT: heating mode
COOL: cooling mode.
HOT WATER: hot water heating mode. Shows up when hot water heating function activated.
DEF: Defrost Mode. Shows up in defrosting mode.
NET: Remote Control Function. Shows up when remote control function activated.
14.6. Parameter Settings
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Item
Parameter Name
Max
Min
Unit
Default
Remarks
1
Hot Water Temp
60
25 ℃ 55
Only valid when P25 value is set as 1.
2
Defrost Cut-in Time
90
30
min
30
3 Defrost Cut-out Time
25
3
min 8
4
Defrost Cut-in Temp
5
-9 ℃ -2
5
Defrost Cut-out Temp
25
5 ℃ 15
6
Defrost Heating Cable Cut-in
Ambient Temp
10
-10 ℃ 0
Only valid when defrost heating cable
( to help defrost ice) is installed
7
Backup Electricity Heater Cut-in
Ambient Temp
12
-10 ℃ 6
Only valid when backup electricity
heater is installed
8
E20/E21 Cut-in Discharge Gas
Temp
120
70 ℃ 95
9
E20/E21 Cut-out Discharge Gas
Temp
120
70 ℃ 75
10
E16 Cut-in Outlet Water Temp
10
0 ℃ 5
11
E15 Cut-in Outlet Water Temp
70
40 ℃ 65
12
E6 Cut-in Inlet/Outlet Water
Temp Diff
50
5 ℃ 10
13
E14 Cut-in Inlet Water Temp
5
0 ℃ 3
14
Water Temperature Diff
10
1 ℃ 5
15
Up Limit
10
1 ℃ 5
Only valid when unit is in Auto Mode
16
Down Limit
10
1 ℃ 5
17
Unit Type Selection
2
0
1
2=heating only,1=heating & cooling,
0=cooling only
18
Quantity of Heat Pump Units
10
1
1
19
Weather Compensation Valid?
1
0
0
1=yes;0=no
20
Compensation Temperature in
Heating
30
0
20
Only valid when P19 value is set as 1.
Automatically set water temperautre
= P20+P21/10*(P20 – ambient
temperature).
21
Compensation Coefficient in
Heating
30
1
10
The display value for P21 will be 10
times set value
22
Ambient Temp to Change Fan
Motor Speed
20
0
℃
5
Only valid in heating & hot water
heating mode
23
Automatic On Allowed after
Power is Restored?
1
0
1
1=yes;0=no
24
Interlock Function Valid?
1
0
1 1=yes;0=no
25
Hot Water Heating Mode
Activated
1
0
0 1=yes;0=no
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Water Temperature In Cooling
Mode
25
8 ℃ 12
Switch on the control panel and then
press Up or Down button to change
the set water temperature in cooling,
heating and auto mode. The range of
water temperatures is different in
different modes.
Water Temperature In Heating
Mode
60
25 ℃ 40
Water Temperature in Auto
Mode
50
10 ℃ 30
15. Function Description
15.1. Automatic Mode
The unit will select heating or cooling mode automatically depending on the current inlet water temperature.
When Ti ≥ Ts + P15, the unit enters cooling mode;
When Ti ≤Ts – P16, the unit enters heating mode;
Where Ti is inlet water temperature read by CN3, Ts is the set water temperature, P15 is the parameter value set in P15, and
P16 is the parameter value set in P16.
15.2. Cooling Mode
Compressor On Conditions:
When Ti ≥ Ts + P14, the compressor(s) is (are) on;
Compressor Off Conditions:
When Ti ≤ Ts, the compressor(s) is (are) off;
Where P14 is the parameter value as set in P14.
15.3. Heating Mode
Compressor On Conditions:
When Ti ≤Ts – P14, the compressor(s) is (are) on;
Compressor Off Conditions:
When Ti ≥ Ts, the compressor(s) is (are) off;
In units with dual compressors, there is a delay of thirty seconds between the two compressors’ starts/shutdowns.
15.4. Hot Water Heating Mode
Hot water heating mode is only a submode in Cooling or Heating Mode. When the unit is installed for house heating or house
cooling and at the same time domestic hot water heating is needed, this function is needed. When the unit is installed only for
domestic hot water heating ( without house heating and house cooling ), do not activate hot water heating mode. Use heating
mode to control hot water heating.
Hot Water Heating Function Cut-in Condition
Water temperature ( ready by CN8) ≤ P1- P14
When above condition is satisfied, the three way valve will energize to direct the water from the condenser to the hot water
tank. Unit will be switched from cooling or heating mode to hot water heating mode.
Hot water Heating Function Cut-out Condition
Water temperature ( ready by CN8) ≥ P1
When the above condition is satisfied, the three way valve will de-energize to direct the water back to house heating
equipments.
15.5. Backup Electricity Heater Control
Heater On Conditions
a. Ti ≤Ts – P14-3℃, and
b. Ta≤P7,and
c. The compressor has run for at least 60 seconds in heating mode.
Where Ti is inlet water temperature read by CN3, Ts is set water temperature, Ta is ambient air
temperature read by CN5, and P7 is the parameter value set in P7.
Heater Off Conditions
a. Ti ≥Ts - 2℃, or
b. Ta>P7
15.6. Fan Motor Control
In cooling mode, only high speed fan (FAN2) will be active.
In heating mode,
When the ambient temperature ≥ P22, only FAN1(low speed) will be active.
When the air temperature＜P22, only FAN2 (high speed) will be active.
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The fan motor has three speeds, with low speed in yellow color, medium speed in blue color and high speed in black color. A
factory set unit has blue wire connected to FAN1 and black wire connected to FAN2. It is not recommended to change high
speed to low speed manually because insufficient air volume in low air temperatures could damage the unit.
The fan motor will be off when the unit is in defrost mode.
15.7. Defrost Control
Defrost Cut-in Condition
In Heating or Hot Water Heating Mode, when the evaporator coil temperature (read by CN6/CN7) is lower than P4, the unit
begins to count the time. If the count time is equivalent to or bigger than P2, the corresponding system enters defrost mode.
When the defrost cut-in conditions of System 1 (2) are satisfied, and the count time of System 2 (1) is bigger than a half of P2,
both systems will enter defrost mode. Otherwise only System 1 (2) will enter defrost mode and System 2 (1) will be shutdown.
Note: During time counting period, if the evaporator coil temperature is observed to be higher than P4, the count time will be
restored to zero.
In defrost mode, the water pump and the corresponding compressor continue to work, fan motor stops, and 4-way reversing
valve energizes.
Defrost Cut-out Conditions (Sufficient)
a. The Evaporator Coil Temp≥P5;
b. Defrost time ≥P3;
When any of the above conditions are satisfied, defrost mode will be terminated.
15.8. Crankcase Heater Control
In heating mode, when the ambient air temperature is lower than 10℃, the heater will turn on when compressor is off and turn
off when the compressor is on.
When the ambient air temperature is above 15 ℃, the crankcase heater will turn off.
Control of 4-way Reversing Valve
The 4-way reversing valve will be activated when the unit is in cooling or defrost mode. In heating mode the 4-way reversing
valve will not be activated.
15.9. Remote Control
Set P24 as “1”to activate Remote Control Function.
If this function is activated, put a signal switch between ports COM and EN. The mainboard will keep checking the state of
switch between ports COM and EN. If it is from on to off, the unit will be started. If it is from off to on, the unit will be shut down.
15.10. Power Failure Memory
The parameter settings will not be lost on power failure occasions; If control panel is disconnected by accident, the system will
remain working as normal.
No matter the power failure occurs while the unit is on or off, once the power is restored the unit will be restored to the state
prior to the occurrence of power failure (if parameter value for P23 is set as 1).
Note: If hot water heating function is activated, after the power is restored, the unit will run in hot water heating mode first
before it goes back to the original mode.
Defrost Heating Cable Control
In heating mode, when ambient temp is lower than P6 set value, the defrost heating cable will turn on to help defrost the ice
accumulated in the base pan of the heat pump.
15.11. Weather Compensation
Set P19 value as “1” to activate weather compensation function. Once this function is activated, the water temperature will
be automatically set according to different ambient temperatures.
For example, if P20 value is set as”20” and P21 value is set as “10”, the automatic set water temperatures in different
ambient temperatures will be as below.
15.12. Modular Control Function
Set P18 value according to actual quantity of units.
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Set Jumpers No. 5 to No. 8 on the mainboard of each unit accordingly.
Ambient
Temperature (Ta)
Coefficient
(P21)
Compensation
Temperature (P20)
Set Water Temperature
10
20
=P20+P21*0.1*(P20-Ta)
15
10
20
25
14
10
20
26
13
10
20
27
12
10
20
28
11
10
20
29
10
10
20
30
9
10
20
31
8
10
20
32
7
10
20
33
6
10
20
34
5
10
20
35
4
10
20
36
3
10
20
37
2
10
20
38
1
10
20
39
0
10
20
40
-1
10
20
41
-2
10
20
42
-3
10
20
43
-4
10
20
44
-5
10
20
45
-6
10
20
46
-7
10
20
47
-8
10
20
48
-9
10
20
49
-10
10
20
50
-11
10
20
51
-12
10
20
52
-13
10
20
53
-14
10
20
54
-15
10
20
55
Connect the unit one by one through CN12.
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Auto Set Water Temp Table
0
10
20
30
40
50
60
15
12
9630-3-6-9
-12
-15
Ambient Temp ( deg C)
Coefficient
Compensation Temp (deg C)
Auto Set Water Temp ( deg
C)
Weather compensation settings will only be valid in heating mode and will not affect the manually set water temperature in hot
water heating mode and cooling mode.
16. Unit Protection
16.1. Winter Anti-freeze Protection
While the unit is off,
When Ta ≤5℃, and Ti≤P13
where Ta is the ambient temperature, Ti is the inlet water temperature and P13 is the parameter value set in P13,
in sixty seconds the unit will automatically run in heating mode to protect water from freezing.
Anti-freeze Protection Process
Display Error Code “E14” ——> Pump On ——> Backup Electricity Heater, Fan Motor 1 and 2, Compressor 1 and 2
On——> Inlet Water Temp＞15℃——> All outputs closed in sequence——> Unit back to Off State
When Ta ≤5℃, and Ti≤P13 + 3℃
The water pump will run for 5 min every 30 min.
16.2. Compressor Running Protection
Time Delay from Compressor On to Compressor Off: 60 seconds.
Time Delay from Compressor Off to Compressor On: 180 seconds.
16.3. Brazed Plated Heat Exchanger Anti Freeze Protection
In cooling mode,if the outlet temperature remains below P10 for 60 seconds continuously, the protection will be activated. The
compressor will be shut down but the water pump will continue to work. After the outlet water temperature is 3℃ higher than
P10, the unit will be restored to the original running mode in 3 minutes.
When the anti freeze port “SET”is disconnected, the compressor will be shut down. When the anti freeze port is connected,
the unit will be restored to the original running mode.
16.4. Outlet Water Temperature in Heating Too High
In heating, if the outlet water temperature is higher than P11, the protection will be activated. The compressor and the backup
electricity heater (if installed) will be shut down. When the outlet water temperature is 15℃ lower than P11, the unit will be
restored to the original running mode.
16.5. Temperature Sensor Malfunction Protection
Malfunction with any of Inlet Water, Outlet Water, Ambient Air, Hot Water or Evaporator Coil Temperature Sensors will close all
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outputs.
Error Code
Input Port
Error Description
Code
Results
01
Inlet Water Temp Sensor
Malfunction
E1
Close All Outputs
02
Outlet Water Temp
Sensor Malfunction
E2
Close All Outputs
03
Ambient Air Temp Sensor
Malfunction
E3
Close All Outputs
04
Evaporator Coil Temp
Sensor 1 Malfunction
E4
Close All Outputs
05
Evaporator Coil Temp
Sensor 1 Malfunction
E5
Close All Outputs
06
FLOW
Insufficient Water Flow
( Water Flow Switch
Malfunction or Water
Temp Diff too Big)
E6
Close All Outputs
07
HP1
High Pressure Protection
Compressor 1
E7
Shut Down Compressor
1
08
LP1
Low Pressure Protection
Compressor 1
E8
Shut Down Compressor
1
09
HP2
High Pressure Protection
Compressor 2
E9
Shut Down Compressor
2
10
LP2
Low Pressure Protection
Compressor 2
E10
Shut Down Compressor
2
11
Hot Water Temp Sensor
Malfunction
E11
Close All Outputs
12
OV1
Compressor 1 Overload
E12
Shutdown Compressor
1
Note: Water Pump control in antifreeze protection will never be blocked.
16.6. Insufficient Water Flow Protection
All outputs will be closed if water flow is insufficient or the water flow switch is malfunctioning.
System uses two approaches to check whether the water flow is insufficient.
Water Flow Switch
System will check the state of Water Flow Switch one minute after the water pump is on. Insufficient water flow protection will
be activated if the switch is observed to be disconnected for a continuous 10 seconds.
Water Temp Difference between Inlet and Outlet
When inlet/outlet water temperature difference is bigger than P12, insufficient water flow protection will be activated.
16.7. High/Low Pressure Protection
1) High Pressure Protection：If the High Pressure Switch is observed to be disconnected, High Pressure Protection will be
activated and the corresponding compressor will be shut down.
2) Low Pressure Protection: When the Low Pressure Switch is observed to be disconnected for a continuous 10 seconds, the
corresponding compressor will be shut down.
(Low Pressure Protection will be blocked in the first three minutes in heating mode, in the first 30 seconds in cooling mode
and in defrosting state.)
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13
OV2
Compressor 2 Overload
E13
Shutdown Compressor
2
14
Winter Anti Freeze
Protection
E14
Turn on backup
electricity heating
element and run in
heating mode
15
Outlet Water Temp Too
High in Heating
E15
Shutdown Compressor
and Backup Electricity
Heater
16
SET
Outlet Water Temp Too
Low in Cooling
E16
Turn off compressor,
turn on pump and
backup electricity heater
17
Discharge Gas Temp
Sensor 1 Malfunction
E17
Close All Outputs
18
Discharge Gas Temp
Sensor 2 Malfunction
E18
Close All Outputs
19 Communication Error
E19
Close All Outputs
20
Discharge Gas Temp 1
too High
E20
Shutdown Compressor
1
21
Discharge Gas Temp 2
too High
E21
Shutdown Compressor
2
22
BUS
Comprehensive Error
E22
Close All Outputs
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