Glen Refrigeration offers the outdoor condensing unit with intelligent control board technology. The control board for the outdoor condensing unit, likes the brain of human. It integrates many functions:
By integration of these functions, it can intelligently detect unit failures and protect the unit and compressor.
With this control board, it is easy to find the fault and troubleshoot. Easy for maintenance.
Reliability is the first and most important for commercial refrigeration condensing unit. Glen refrigeration reliability is more than a pledge. It’s our most important deliverable. Glen refrigeration ensures the high reliability of condensing units and packaged refrigeration units product reliability from 3 aspects.
Now we would like to introduce the “Control Board” for 1 HP to 7 HP outdoor condensing units.
From the control board picture above, there is discharge temperature sensor and condensing temperature sensor. It can monitor the discharge temperature and condensing temperature, then adjust the condenser fan speed according to the changing of the condensing temperature.
It integrates the many functions:
When the electric board is power on, the digital tube of the control board can display the P2, P3, P4, P5, P6, P7, P8 circularly. When there is fault, the the digital tube will display the fault code. Then we will know the fault clearly according to the fault code.
P2 is mini stop time, 3 minutes. When the condensing unit stops, there will be a 3-minute delay to restart. The most common is after the low pressure protection shutdown, the compressor will restart after 3 minutes delay.
The 3 minutes delay is to protect the compressor, avoiding the compressor start frequently.
It is not good for compressor oil return. When start up, the refrigeration oil is discharged from the compressor along with the refrigerant. If the operation time is short and the compressor shuts down, so the oil can’t return to the compressor in time, the compressor will broken easily because of wear due to lack of oil.
So 3 minutes is the mini stop time.
P3 is discharge temperature. There is a discharge temperature sensor, installed on the discharge tube, used to monitor the compressor discharge temperature. If the compressor discharge temperature over-high, it will be protected. Please see the discharge temperature sensor below:
P4 is condensing temperature. There is a condensing temperature sensor, monitors the change of condensing temperature. It is used for the control of the condenser fan speed. When the condensing temperature rises, the condenser fan speed increases; when the condensing temperature drops, the condenser fan speed decreases. Please see the condensing temperature sensor below:
Generally the condensing units are installed outdoors, when the ambient temperature is very low in winter (or in low-temperature environments), the discharge pressure (condensing pressure) of the system will tend to be lower, the expansion valve will not be able to obtain sufficient pressure drop at both ends, making it difficult to provide appropriate refrigerant to the evaporator. On the other hand, the cooling capacity of the system will not meet the requirements, and the system will also cause low-pressure alarms and low-pressure protection frequently.
Glen Refrigeration offers the outdoor condensing unit with an intelligent control board, it has the function of fan speed regulation. When the ambient temperature is very low, the control board will reduce the fan speed even stop the fan.
P5 is Fan control duty ratio. When the condenser fan is running at full speed, the fan control duty ratio is 100. When the ambient temperature is very low, the control board will reduce the fan speed even stop the fan. When the fan is stopped, P5 will display 0. Please see the picture below:
When there is fault, the digital tube will display the fault code, so we can know the problem and troubleshoot easily and clearly.
How to determine the discharge temperature sensor is faulty or not?
Solution:
If the discharge temperature sensor is faulty, replace it with a new discharge temperature sensor. We will deliver some spare parts with each order, including the discharge temperature sensor.
Please check whether the condensing temperature sensor is faulty or the sensor falls out. If the condensing temperature sensor is faulty, replace it with sensor. We will deliver some spare parts with each order, including the condensing temperature sensor.
About the low pressure protection, there is two kind of situations:
When the condensing unit high pressure reaches high pressure set value, causes high pressure protection. Generally, the high pressure protection set value is 3.0 MPa.
There are two main reasons caused compressor discharge temperature over-high protection.
Firstly, we need to determine whether the discharge temperature senor has fault or not? How to determine the discharge temperature sensor is faulty or not?
If the discharge temperature sensor is no problem, the reason caused compressor discharge temperature over-high is return gas superheat too high (The return gas temperature is too high).
After three consecutive low pressure protections, the control board will be locked. The compressor will not start all the time. You must manually power off and troubleshoot, then power on and start it again.
But in pump down refrigeration system, it will not be locked.
After three consecutive high pressure protections, the control board will be locked. The compressor will not start all the time. You must manually power off and troubleshoot, then power on and start it again.
Glen Refrigeration is a leading condensing unit and monoblock refrigeration unit manufacturer in China. We focus on the R&D, production and sales of air cooled condensing unit, water cooled condensing unit, indoor condensing unit, outdoor condensing unit, monoblock refrigeration unit, inverter condensing unit, multi-compressor refrigeration system, hot gas defrosting refrigeration systems and many other refrigeration products. We have proudly served the commercial refrigeration industry with the most customer-focused products and innovations.
The 220V~240V/50HZ outdoor condensing unit adopts Sanyo rotary refrigeration compressor. Sanyo is the leading rotary refrigeration compressor for commercial refrigeration manufacturer in China. The evaporating temperature range of the outdoor refrigeration condensing units is from -5°C to -45°C.
Model:
The 380V/50HZ 2 hp and 3 hp outdoor condensing unit adopts Sanyo 380V/50HZ rotary refrigeration compressor. Sanyo rotary refrigeration compressor features high efficiency and high reliability. Wide evaporating temperature range -5°C to -45°C makes the condenser outdoor unit suitable for medium temperature refrigeration and low temperature refrigeration applications.
Model:
The 380V/50HZ outdoor unit condenser with Panasonic scroll compressor for high temp refrigeration and medium temp refrigeration applications, cooling capacity available from 4 hp to 12.5 hp. Panasonic scroll compressors are designed with quite operations, high efficiency and high adaptability to the ambient temperature, which proven in decades of the commercial refrigeration applications.
Model:
Designed for HBP and MBP commercial refrigeration and processing cooling applications, Glen refrigeration offers ZB compressor Copeland outdoor condensing unit from 2 hp to 25 hp.
Model:
Glen refrigeration offers ZF compressor Emerson outdoor condensing unit to provide the best performance in low temperature, operating with liquid injection in order to control the discharge temperature and extend the operating envelop.
Model:
ZFI compressor Copeland Scroll outdoor condensing unit are optimized for vapor injection with the use of a subcooler (also called economizer), boots the condensing unit refrigeration cooling capacity and efficiency.
Model:
Glen refrigeration offers ZSI compressor Copeland outdoor condensing unit, features liquid injection technology, controlled by CoreSense control board. This combination widens the operation envelop and also enhances the condensing unit reliability.
Model:
Sanyo 220V 60Hz compressor provides perfect cooling performance and high reliability for 220V 60Hz outdoor condensing unit.
Adopts ZB*KQE TF5 series Emerson scroll compressor and Panasonic scroll compressor with liquid injection, designed for LBP and MBP.
Panasonic scroll compressor, with liquid injection, provide excellent cooling for 380 V 60Hz 3PH condensing unit requirements.
Professional manufacturer and supplier of condensing units and refrigeration unit and compressors.
We will contact you within 8 hours. Please pay attention to the email with the suffix “@greehvacr.com”.
The experts at Glen Refrigeration will be happy to help you choose the cold room that perfectly suits your business needs – if you’d like further advice on choosing a cold room, you can get in touch with us via whatsapp 0086 15057108995 via emailing info@greehvacr.com, or by submitting a response on our contact form below.
We will contact you within 8 hours. Please pay attention to the email with the suffix “@greehvacr.com”.
