Juteng JT-25ZTX User manual

Air source heat pump dryer
Manual
JT-25ZTX JT-35ZTX JT-50ZTX

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Content
1. To user …………………………………………............…………………3
2. Product introduction ………………………………………………...….. 3
3. Technical parameters………………………………………….…………
. Heat pump principle…………………………………………………..… 5
5. Controller ………………………………………………...............………5
6. Installation debugging and running……………………........………… 8
7. Maintenance……….........................................………………….…… 9
8. Common failures and troubleshooting methods ….........…………....10
9. Circuit diagram ……..……….…………………….……...............………12

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1.To user
1Before installing and using this product, please read this manual carefully, otherwise it will damage the
equipment, hurt the operator and loss property.
2 Technology continues to progress, product series and specifications will be improved, please pay
attention to our latest product information.
3 When reading this manual, if you need any technical advice, please contact the company or local
agents.
Notes:
.1 When installing heat pump dryer unit, please check the corresponding power supply whether meet
the heat pump power requirements, please refer the detail nameplate or installation instructions.
.2 Be sure to install the earth leakage protection device.
.3 Heat pump must be reliable grounding, is strictly prohibited in the case of no reliable grounding
using the unit. Do not connect the ground wire to zero wire.
. When wiring the electrical wire, please refer to the wiring diagram.
.5 For safe use, do not privately modify or repair the heat pump dryer unit.
.6 It is strictly forbidden to insert any tools into the heat pump so as not to touch the fan. This may
cause damage the unit or accident (children avoid).
.8 Do not use the drying unit in the state of removing the grid or sheet metal, so as to avoid accidents
or abnormal operation of the unit.
.9 When the unit is immersed in water, please contact the manufacturer or its maintenance
department immediately. It can’t re-use the unit until the technical personnel checking.
.10 Non-qualified technical staff must not adjust the switches, valves, controllers and other
components.
2. Product introduction
2.1 Heat pump characteristics
High efficient and energy saving
Heat pump dryer units get a lot of free heat from the air, consume a little electric about a quarter of the
traditional electric heater to carry air or solar energy with same hot water output, so save a lot of
electricity costs.
Green and environmental protection
Heat pump dryer units use solar energy, air, hydrothermal energy and electric clean energy, without
any oil, coal, gas and other fossil fuels to cause environmental pollution. It does not discharge harmful
gases during working, truly energy saving and environmental protection.
All-weather use
Heat pump dryer units don’t be affected by cloud, rain and other heavy weather, it can use at all
weather during 2 hours a day.
Long life span
Heat pump dryer units adopt the high quality world famous brand compressor, four-way valve and
other main parts, corrosion-resistant stainless steel plate, thus ensuring the quality of products, its
service life is over 10 years, much higher than other types of water heater’s life.

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idely used
Heat pump dryer series have a different capacity to meet different occasions, material requirements.
3. Technical parameters
Unit technical data
Note: The technical parameters of heating capacity working condition:
Outdoor dry-bulb temperature 20℃, the oven temperature is 70℃.
Dehumidified volume working condition: the bake room temperature 35℃, drying room humidity is 60%
Our company reserves for improving product performance and design without prior notice.
In actual use, please take the drying room heat loss around 6% into consideration.
Parameter data, if there is difference, please refer to the nameplate as standard.
Model No. JT-25ZTX JT-35ZTX JT-50ZTX
Horse power (HP) 1 1.5 2
Oven temp.(℃) 10-80 10~80 10~80
Dry humidity(%) 8%-99% 8%-99% 8%-99%
Heating capacity 2. 1 3.50 . 8
Rated power input(kW) 0.86 1.25 1.6
COP 2.8 2.8 2.8
Rated current input 5.5A 7.2A 7.2A
Maximum power input 1 00W 1500W 1900W
Maximum current output 6.3A 8.6A 11A
Auxiliary heater power
input 2kW 2kW 2kW
Auxiliary heater current 9A 9A 9A
Refrigerant R13 a R13 a R13 a
Power supply 220V/1Ph/50 or 60Hz 220V/1Ph/50 or 60Hz 220V/1Ph/50 or 60Hz
Suction/discharge max
pressure 0.7 / 3.8MPa 0.7 / 3.8MPa 0.7 / 3.8MPa
Dehumidify capacity(L/H) 2.5 3.75 5
Material plate layer 15 18 18
Anti-electric shock class Grass I Grass I Grass I
Noise ≤6 dB(A) ≤68dB(A) ≤68dB(A)
Working temp. -10- 0℃-10- 0℃-10- 0℃
Drying room 690*690*1690 710*690*1810 710*690*1810
Net weight 185kg 210kg 220kg
Product dimension 1270×760×1650=1.59m³ 1270×760×1850=1.79m³ 1270×760×1850=1.79m³
Test condition: Heating capacity: Outside dry bulb temp. 20℃, oven temp. 70℃
Dehumidify: Drying room temp. 35℃, drying room temp. 35℃, humidity 60%

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4. Heat pump principle
Working principle:
Compressor absorbs low temperature and low pressure refrigerant gas from the evaporator, then
refrigerant compressed to high temperature and high pressure gas. The high temperature and high
pressure gas goes into the condenser through fan to exchange heat with the air, and condensed into
cryogenic liquid in the condenser and give off a lot of heat.
The air absorbs the heat and the temperature increasing. High pressure and low temperature liquid is
throttled and depressurized through the expansion valve, absorbs heat from the surrounding air and
volatilize into low pressure gas by fan in the evaporator, being compressed in the compressor, this
repeated cycle, so as to continuously rise the drying room temperature.
5. Controller

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Main menu interface
5.1 Controller operation method
5.2 Lock and unlock
At the unlock state, press for 3s until hear “Di” sound, the key is lock.
At the lock state, press for 3s until hear “Di” sound, the key is unlock.
Timer on-off function
It will timer on or off at the setting timer time.
5.3 System parameter setting (At the power-on state it can change the parameter)
Parameter Name Range Default Note
1Drying setting (it can set on the running
state) 15℃~80℃70℃Adjustable
2Drying return difference 1℃~15℃5℃Adjustable
3Cold-dry setting (it can set on the
running state) 5-28℃12℃Adjustable
4Cold-dry return difference 1℃~15℃5℃Adjustable
5Humidity setting (it can set on the
running state) 8%-99% 0% Adjustable
6Humidity temp return difference setting 1%~15% 5% Adjustable
7Drying mode (it can set on the running
state)
Ladder heating/
rising heating
Rising
heating Adjustable
8Defrost inner fan On/off off Adjustable
9E-heater No/yes yes Adjustable
10 E-heater lower limited 0℃-60℃20℃Adjustable
11 E-heater return difference 0℃-10℃5℃Adjustable
12 Forced E-heater On/off off Adjustable
13 Compressor stop 3-60min 3min Adjustable
14 Humidity elimination fan 0 press set humidity
1Automatic control 0 Adjustable

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15 Humidity excl fan 0 humidity control/
1 automatic control 0 Adjustable
16 Defrost entrance -9℃~3℃-3℃Adjustable
17 Defrost exit 5℃~25℃15℃Adjustable
18 Defrost interval 10~90min 50min Adjustable
19 Defrost time 1~12min 12min Adjustable
20 Power off memory No/yes yes Adjustable
21 System quantity 1/2 1 Adjustable
22 Humidity on time 0-1 (660min) 6 Adjustable
23 Return fan temp compensation 0℃-10℃0℃Adjustable
24 Humidity compensation 0%-10% 0℃Adjustable
25 Humidity elimination work time 1-60min 10min Adjustable
26 Humidity elimination interval time 1-60min 20min Adjustable
5.4 Temp inquiry
5.5 Function control description
1. Work in ten times section, adjust the working time independently for each time section, set the
temperature, set the humidity
2. When setting temperature < room temperature, the compressor is on
When setting temperature> room temperature, the compressor is off
When setting humidity +5 < indoor humidity, the ventilator opens
When setting humidity > indoor humidity, the ventilator closes
3. When the sensor is faulty, stop the machine to protect
. When high pressure or low pressure, stop machine to protect
Parameter Meaning Range Note
1 Return air temp. -20℃~99℃Measured value
2 Drying room humidity 0%~99% Measured value
3 Outside ambient temp -20℃~99℃Measured value
Outside coil temp 1 -20℃~99℃Measured value
5 Outside coil temp 2 -20℃~99℃Measured value
6 Exhaust temp 1 0℃~125℃Measured value
7 Exhaust temp 2 0℃~125℃Measured value
8 Return air temp 1 -20℃~99℃Measured value
9 Return air temp 2 -20℃~99℃Measured value
10 Outlet air temp -20℃~99℃Measured value
11 EEV opening 1 60-500 step Measured value
12 EEV opening 2 60-500 step Measured value

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5. When the exhaust temperature > setting protection temperature, open the bypass solenoid valve;
close the solenoid valve when less than setting 5 degrees.
5.6 Function mode description
1 Drying mode: Rapid Heating, warming;
2 Cooling mode: Cooling and dehumidification
3 Dehumidification mode: Heating warming firstly, change to Dehumidification after reaching the setting
temperature;
Drying + hydrofuge mode: It can be hydrofuge at the heating process;
5 Drying + dehumidification: Priority to dry, after reaching the set temperature, change to
dehumidification;
6 Ventilation: Circulating fan operation, other parts are not running;
7 Dehumidification + hydrofuge: It can be hydrofuge at the dehumidification process.
8 Installation instruction
a. Unit should be installed in a large and well ventilated place, and it’s better to avoid to expose to the sun
and rain.
b. Make sure the installation place is not any block at the inlet and outlet.
c. Set drain near the installation location so as to easily carry out drainage.
d. The installation foundation should be solid and firm to ensure the unit runs steady.
e. Make sure the machine installed upright not slant.
f. Do not install the host unit in the contaminated, corrosive gas and gray sand, leaves and other
contaminants easily gathered place.
g. The installation location can not be close to inflammable, explosive and open fire place.
6. Installation debugging and running
6.1 Prepare work before commissioning
a) Heat pump dryer unit inspection:
※Check whether the unit appearance and the inside piping system are damaged during transport.
※Check whether the fan blades interfere with the fan fixed plate and fan guard.
b) Distribution system inspection
※Check whether the power supply is consistent with the power supply required on this manual
and the unit nameplate.
※Check all power supply and control lines are all connected in place, whether the wiring diagram
according to the correct wiring, grounding is reliable, all terminals are tight.
6.2 The commissioning of the commissioning unit must be performed by a professional!
※When the entire system is conducted a comprehensive inspection and meet the requirements,
the overall test run.
※Connect the power and turn on the heat pump, the host units delay 3 minutes then start
automatically.
For the three-phase power unit, at first check whether the fan run rightly. If not, please turn off the power

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immediately to adjust the phase sequence.
Measure whether the compressor operating current is normal or have abnormal sound.
※Check whether the unit meets the requirements, run for some time (usually 3 days), then the unit
can put into normal use.
6.3 Normal operation
※Heating running process:
Turn on unit -- Inside fan running -- fan motor running -- compressor control running
※Temp control: When the setting temp < indoor temp, compressor starts;
When the setting temp > indoor temp, compressor closes.
※Setting humidity +5 < inside humidity, hydrofuge fan opens;
When the setting humidity > inside humidity, hydrofuge fan closes.
※The four-way valve is a power-off state at the normal start, -way valve turn on power and work
only in the defrost.
7. Maintenance
Heat pump dryer unit is a high automatic apparatus, regularly checking when using. If the unit keeps a
long-term and effective maintenance, the operational reliability and service life will be unexpectedly
improved.
1. When use and maintain the unit, please pay attention to:
All safety devices in the unit are set at the factory, don’t self-adjustment.
2. Check the unit's power and electrical system wiring is solid usually, whether electrical components
are abnormal, if abnormal it should be timely maintenance and replacement.
3. It should be kept clean and dry, well ventilated around the unit. Regular cleaning (1-2 months) heat
exchanger to maintain heat transfer in a good effect.
. Check the work of the unit various parts often, check the inside pipe joints and inflation valve
whether has oil to ensure the unit refrigerant without leakage.
5. Please don’t stack sundries block around the unit so as not to block inlet and outlet, the unit should
be kept clean and dry, well ventilated.
6. If the shutdown time is longer, cut off the power, set a good protective cover. Conduct a
comprehensive inspection before restarting the system.
7. When the unit failure, if the user can not solve, please call the company in the local special
maintenance department, in order to send people maintenance in time.

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Error code sheet:
8. Common failures and troubleshooting methods
1. Compressor 3 min delay protection, compressor start and stop time is 3min.
2.High pressure protection:
(pressure switch off) In (three times / hour), the display does not show pressure protection. After the
pressure recovery, compressor is delayed for 3 minutes to restart.
When over (three times / hour) the controller locks the fault, accordingly compresses is no longer
restarted regardless of whether the pressure switch is reset, and the fault code is displayed;
3. Low pressure protection:
Don’t detect low pressure switch during defrosting; Heating start delay 3 minutes detection, pressure
switch off, accordingly compressor do not restart regardless of the pressure switch is reset, and the fault
code is displayed;
Fault code Fault name
E00 Phase sequence protection
E01 High pressure switch 1 fault (Protect when Switch off)
E02 Low pressure switch 1 fault (Protect when Switch off)
E03 High pressure switch 2 fault. Single system don’t have
(Show error when switch off )
E0 Low pressure switch 2 fault. Single system don’t have
(Show error when switch off )
E05 Fan pressure switch fault
E06 Communication fault (Controller can’t receive the main board
signal)
E07 Return air temp sensor fault (Open circuit or short circuit)
E08 Drying room temp sensor fault (Open circuit or short circuit)
E09 Outside temp sensor fault (Open circuit or short circuit)
E10 Air outlet temp sensor fault (Open circuit or short circuit)
E11 Outdoor coil temp sensor 1 fault (Open circuit or short circuit)
E12 Outdoor coil temp sensor 2 fault (Open circuit or short circuit)
E1 Return air 1 temp sensor fault (Open circuit or short circuit)
E15 Return air 2 temp sensor fault (Open circuit or short circuit)
E16 Exhaust temp sensor 1 fault (Open circuit or short circuit)
E17 Exhaust temp sensor 2 fault (Open circuit or short circuit)
E18 Exhaust temp sensor 1 temp over high
E19 Exhaust temp sensor 2 temp over high

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. The temp sensor failure: if sensor is failure, it stops all components.
5. Exhaust temperature protection:
In (three times / hour), the display does not show the exhaust temperature protection, after the
exhaust temperature recovery, the compressor is delayed for 3 minutes to restart. The controller locks the
fault when it exceeds (three times / hour), the corresponding compressor is not restart and display fault
code.
6. Default phase and anti-phase protection: all components of the unit do not allow action, then
display the fault and code.
Please refer the below sheet to trouble shooting.
Fault state Possible fault reason Treatment
Unit not running
Power supply fault
Power supply wiring is loose
Fuse is broken
Turn off power and check the power
Check the cause and repair
Replace fuse
Heating capacity
is low
Lack of refrigerant
Warehouse poor insulation
Improper hydrofuge settings
System leak detection and filling
refrigerant
Strengthen the warehouse insulation
Set suitable hydrofuge control
Compressor not
running
Power supply fault
Compressor contactor is
damaged
Wiring loose
Compressor overheat protection
Check the cause and solve power
fault
Replace contactor
Check loose points and repair
Check the cause of heat
troubleshooting and then boot the unit
Compressor loud
noise
Liquid goes into compressor
Compressor internal parts are
damaged
Check expansive valve whether is out
of work
Replace compressor
Fan not running
Fan screws loose
Fan motor burned
Contactor is damaged
Tighten the screws
Replace fan
Replace contactor
The compressor
is running, but the
unit is not heated
Refrigerant leakage
Compressor fault
System leak detection and filling
refrigerant
Replace compressor
Exhaust pressure
is too high
To much refrigerant
Refrigerant system has
non-condensable gas
Get out redundant refrigerant
Get out non-condensable gas
Suction pressure
is too low
Filter clogging
Solenoid valve is not open
The pressure drop through the
heat exchanger is too large
Replace filter
Repair or replace solenoid valve
Check the thermostatic expansion
valve opening whether is proper

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9. Circuit chart
Contact: Jenny Zeng
Cell & WhatsApp & Wechat & IMO: [phone]
Jenny Zeng Skype: jenny02025
E-mail: <jennyzeng5@foxmail com>