RIDGID MT-HS23P User manual
1. Packing List
1.1
Cooler (Indoor Evaporator) Part’s List
Cooler Part’s List (Indoor Evaporator)
No.
Item
Quantity
Note
1
Cooler
1
Expansion Valve Included
2
Remote Control
1
Standard
3
Battery
2
Standard
4
Drain Pipe
1
Standard
5
Insulated Cotton
2
Standard
6
Three-way valve
1
Standard
7
Nut & Screw
4
Standard
8
Positive and negative power lines
1
Standard
1.2
Condenser (Outdoor) Part’s List
Condenser Part’s List (Outdoor)
No.
Item
Quantity
Note
1
Condenser
1
Standard
2
High & low pressure connection tube
1
(Optional)
3
Power cord
1
(3 meters)
4
Manual
1
Standard
5
Bracket
2
Standard
6
Support Frame
2
Standard
7
Nut & Screw
10
Standard
2. Product Technical Parameters
2.1
Specifications
DC Air Conditioner Model
MT-HS23P
Power Supply
DC24V
Working Voltage Range (V)
19V - 32V
Nominal Capacity (W)
1500W~2300W
Input Power (W)
520W~860W
Current (A)
21A~36A
Weigh
Cooler=6.5kgs
Condenser=23kgs
Connecting Pipe
Low Pressure Pipe, M22×1.5
High Pressure Pipe, M16×1.5
External Dimension
Cooler, 480×146×320mm
Condenser, 420×220×380mm
2.2
Test Condition
Test Condition
Power Supply
DC24V
Condensing Temp
45℃
Evaporating Temp
3℃
Suction Temp
15℃
Subcooling Temp
38℃
Ambient Temp
35℃
2.3
Range of Application
Ambient Temp Range
15～43℃
Evaporating Temp Range
-15～15℃
Condensing Temp Range
35～60℃
Refrigerant Filling. (Max)
1200g
Cooling Temp Range
-0～30℃
3. Installation Instruction
3.1
Installation Notice
The products have nitrogen leakage test before they go out.
Pumping vacuum and adding 750g R134A refrigerant is needed before connecting all pipeline.
The aircon unit can be only powered by 12V vehicle lead-acid battery which meets national standard
requirements（GB/T5008.1-2013、GB/T5008.2-2013、GB/T5008.3-2013）.
Then in series to 24V/48V/60V/72V battery unit.
(Note: The voltage must be in the range of 21.5V-27V. High or low voltage will damage the aircon unit)
3.2
Installation Instruction
3.2.1
Inspection before Installation
The aircon condenser needs to be moved and installed by two person.
Unpack the unit and check if there is any damages or anything abnormal.
Prepare installation tools, then check if standard accessories are complete. Accessories packing list is in
the attachment.
3.2.2
Wiring Connection Requirement
Confirm the position of battery, then connect the power wire and fixed position properly
Fix the power cord with ribbon to prevent vibration and wear.
Red wire is positive +
Black wire is negative -
PCB will be burned out if connecting the wire contrarily.
3.2.3
Installation Position Selection
Choose the place where is flat and able to support the weight of the unit.You can add some mounting
brackets if necessary.
Please try to install the cooler closes to car roof, make for air circulation.
Plus, install the cooler and condenser closely to make the pipeline as short as possible.
The cooler is better to be installed in the position where is good for air in&out.
Installation Recommendation:
Top of Co - pilot/Back top of cab
Condenser should be installed in the position where will not influence the air in and heat air out.
Position Recommendation
Back of Cab-needs to confirm if the cab can support the weight of the condenser.
Frame behind driver’s cab-longer connecting pipeline needs to be reserved for cab up and down.
The air inlet size of cooler and condenser should be more than 10cm
The air outlet of condenser must be at least 30cm.
3.2.4
Cooler Installation
Confirm the installation position according to the wiring connection requirements
Fix the wall board according to the cooler installation position and pipe connection.
Please make sure there is at least 4 fixed points between wall board and cab.
The places where the holes are punched must be consulted with the car manufacturer in advance,to
make sure it will not influence the car’s circuit,structure and function.
Also the cooler must be mounted horizontally.
3.2.5
The condenser Installation
Confirm the installation position according to the wiring connection requirements
If install the condenser on the back of cab, please make sure there is at least 10 fixed points.
3.2.6
Wire Connection between Cooler and Condenser.
Connect Cooler and Condenser with the two signal wire which is attached with the unit
Positive pole(+) connects the red wire of condenser, and Negative pole (-)connects black wire.
Cooling system high&low pressure pipeline connects condenser tightly fixed by the nut of aluminium joint
and cooler by expansion valve
Cooler drain pipe and high&low pressure pipeline is connected by ribbon
Please Don’ squeeze the drain pipe, otherwise it will influence drain away the water.
Cover the tube hole with rubber to prevent to damage the high&low pressure pipe.
3.2.7
Add refrigerant in vacuum
Firstly, check the high and low pressure pipe are connected well.
You can add 1.2～1.4MPa R134a refrigerant or nitrogen for leak test if necessary.
Connect pressure gauge with vacuum pump and high&low pressure charging valve
Open the high&low pressure charging valve in pressure gauge.
Then start the vacuum pump to pump vacuum at least 15minutes until it arrives to -0.1MPa
Close the valve, and stop the operation of vacuum pump.
Please keep it more than 5 minutes, to make sure whether the needles in the pressure gauge will come
back or not.
If the needles come back, then check the leak position, and start to vacuum pump again.
If not, start to charge, vent air from the vent hose at first, then open the high&low pressure charging valve
in pressure gauge, and add R134A refrigerant in 700g, cannot exceed 800g.
If the length of high&low pressure connecting tube is more than 5meters, then add refrigerant 30g per
meter.
4. Operating Instruction
4.1
Cooler Controller Instruction
1.Press the on/off button to start cooler.
2.Press Cool Button to start condenser , and enter into refrigeration mode.
3.Press and hold the button , enter into the mode of adjusting under-voltage protection value.
4.Press the button to select the working mode.
5.Press and hold + button to decrease air flow
6.Press and hold - button to increase air flow
4.2
Voltage Check& Battery Protection
Press the power button to start the unit,
Then you can see the battery voltage on the lower left of LCD.
It will be changed according to battery power.
As there is various type battery, please note that factory setting protection value is 21.5V.
If you want to adjust the value, press & hold COOL button, then enter into voltage regulation mode.
5. Wire Connection
6. Troubleshooting
Fault diagnosis
Troubleshooting
A/C fail to work
1. Check Switch if well-connected?
2. Battery power capacity?
3. Earth leakage protection?
Compressor fail to start
1. Battery power capacity?
2. Compressor protection?
Poor Refrigeration
1. filter screen blocking?
2. Air Inlet & outlet pipe blocking?
3. Sun shining directly into the car?
4. Is the wind horizontal or upward?
About temperature
display
Because of the temperature difference in the car, as well as different air speed, there
will be the difference data between the display and detected by users
7. Fault Signal Light Instruction
Light flashed Once：Under voltage or over voltage
Twice：High&low voltage protection
Third：Fail to start or cannot control compressor
Fifth：Controller temperature is too high
Sixth：The unit current is too high, exceed protection value.
Seventh：Compressor is overloading or broken
High pressure side ↑
Low pressure side ↓
(Compressor works normally)
lack of refrigerant (There’s bubble and
expansion valve get frozen through
the sight glass)
Find the leaking,refill refrigerant.
Insufficient heat exchange
Clean heat exchanger
Expansion valve plugging
Change
High&Low pressure side ↓
Lack of refrigerant
Find the leaking, refill refrigerant
The expansion valve opens too small
Change
High&Low pressure side ↑
Too much refrigerant
Release certain of refrigerant
from the low pressure side
There's air inside the system
Checking
Insufficient Condenser
The radiator is deformed and
blocked
Piping blockage at high pressure side
Any bend in the pipe line
The expansion valve opens too large
Checking
8. Common faults and treatment methods
It needs to be tested and disassembled by specialists only.
Following are the common faults and treatment methods:
(Condition: Ambient Temp 35℃,high pressure range 1.1～1.3MPa, low pressure range 0.2～0.35MPa)
Fault phenomenon
Fault diagnosis
Troubleshooting
High pressure side ↑
Low pressure side ↓
(Compressor doesn’t works)
High-voltage tube plugging
Change（large temperature
difference）
Accumulator & Drier plugging
Change
High pressure side normal,
Low pressure side ↑
Expansion valve opens too large
Change
The inlet air temp of evaporator is
high
Lower the inlet temperature
The pressure @ low-pressure side
up and down
Water in the system
Re-vacuum and refill refrigerant
The pressure@ low-pressure↓
The pressure@ high-pressure↓
Low pressure pipeline plugging
Clean or change pipe
Voltage is too low or too high
Voltage checking
steady voltage
The terminal wire loose
Terminal checking
Fastness
Compressor stops working for
protection:
1. over-current protection
2. over-heat protection
3. Voltage protection
4. Overloaded protection
5. Locked-rotor protection
1. System overloaded
2. System overheated
3. Voltage too low or too high
4. Compressor rotor-locked
Keep ventilation & Steady Voltage
System pressure protection
Check if condenser is blocked?
the fan works?
Refrigerant leaking?
Clean Condenser or change fan motor,
find the leaking, refill refrigerant.
Compressor on and off
frequently
Check if temperature probe is
normal
Change
Compressor Speed abnormal
Check Controller
Change
Compressor fail to start
Check controller & compressor
Change
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