【 Weak current College 】 air-cooled cold (hot) water unit for debugging

Cooling (hot) water unit after installation, you should clean the entire water system. Open sewage valve, removed the water filter, rinse, and then installed on the water. Then just open water pumps, engage the whole water system in the loop. Switch off the pump 10min, and then open the drain valve, take apart and wash water filter. This multiple times until you remove the dirt-free water filters. End filling clean refrigerant, exhaust air purification system. Unit powered 6h above. Debugging before the check
(1)
Check air conditioning terminal device
1)
Check that all interior fan coil power wiring is correct, that the fan rotation is normal.
2)
Check the fan-coil and export of valves are all open.
3)
Check the fan-coil air whether line NET, if the coil is in the air, you should open the exhaust valve to discharge it.
(2)
Check the pipe system
1)
Check the system piping, invigorating water pipes, pressure gauge, thermometer is correctly installed.
2)
Check the static pressure of the tank water is healthy (General requirements 50kpa).
3)
Check the system is clean, within the pipes piping refrigerant is full of clean air is discharged.
4) inspection system should open of the valve is opened, you should shut down all of the valve whether emissions clean.
5) inspection of piping system for thermal insulation is good.
(3)
Check the power distribution system
1)
Check whether the power supply unit nameplate on requirements of power supply, power supply voltage is stabilized.
2)
Check all power supply and control lines are all connected in place, according to the manufacturer-provided wiring diagram correctly whether reliable wiring, grounding, all terminals are all fastening.
3)
Check with a megohmmeter is insulated.
(4) check the cold (hot) water unit
1) check the Unit looks and machines pipes are damaged during installation.
2) checks whether the fan blades and fan fixed plateand fan guard with touch wipe.
3) check the cooling system for pressure, if there is leakage of refrigerant.
4) check compressor and pump are intact.
5) check whether the preheating 6h compressor (particularly quarter debugging)
2.
System debug run
(1)
Host debug run in all inspection work is finished, close the power supply, depending on temperature, select run refrigeration or heating mode, press the function key on the control panel room, line debugging.
1)
Pre-boot, to refrigeration system connected to the high and low pressure gauges; in power on the main loop clamp ammeter. Wait for the unit is running.
2)
Power on, outdoor hosts water pump and fan first of all, it should be noted that the three-phase power supply unit, to observe the power supply phase sequence problem, if it is discovered that the water pump and fan operation direction not to immediately cut off the power, the power cord of any two phase line interchange, and then boot normally.
3) where the water system, in General, manufacturers will be set up after 3-5min, compressor starting automatically. At this point to hearing has broken unit operation, if abnormal voice abnormal sound, should immediately check the power outage.
4) compressor starting after the numeric value you want to observe the ampere meter, check whether the current operation and product performance data.
5) unit in normal operation, the compressor suction and discharge pressure as follows:
Refrigeration suction pressure 0.35-0.55mpa (depending on water temperature)
Exhaust pressure 1.30-2.20mpa (depending on the temperature)
Heating inspiratory pressure 0.18-0.42mpa (depending on water temperature)
Exhaust pressure 1.60-2.20mpa (depending on water temperature)

(2) water system debug run
1)
After powering on the host, you should observe the waterway system flow switch and water pressure gauges. Request flow switch has a normal flow of water to keep connected state, access to water pressure gauges to have a certain pressure differential (not less than 50kpa). Adjust the normal flow of water to make residual air side by side.
2)
Observation unit on the inlet and outlet temperature of glass thermometer. In General, the unit runs out of water temperature difference in 4 ℃.
3)
Open indoor air blower plate Tube, adjust the water valve in each room, so that the air conditioning control zone use the temperature reached.
4)
Installation of electric 2-way valve (or electric three-way valve) system, to see whether electric valve work properly adjust the amount of water. If the control does not work, should be adjusted.
(3) protection device, the temperature control method of measuring unit while debugging, apart from the observation of values correctly, you should test unit the protection devices and temperature control whether the play system protection.
1) flow switch protection test in set up and running, slowly water system of the backwater valve closed, in which case the unit water flow, pressure drop. Water flow switch should disconnect the unit stops running.
2) low-water temperature protection test water system flow and temperature controller set value is too low, the low water temperature protection it will behavior. So the water flow decreases or controller setting temperature low, the unit will stop running.
3)
Temperature control system for single-cold and heat pump unit refrigeration at run time, you can set the fan coil unit turned off, when the backwater than set value (generally 12 ° c), the compressor stops working. Then open air blower plate Tube, let the water temperature rises to set value above. This time after time after starting time of the compressor, there should be a normal start running. Similarly, in heat pump heating runtime (General set of return water temperature 40 ° c), or you can follow this methodFor testing.
Auto defrost feature test in the heat pump for heatingoperation mode, the unit operation for a period of time, as the unit setting of defrosting sensor detected condenser tube surface temperature equal to-3 ° c, the crew began to defrost, at this point outdoor fan and four-way valves close, compressor and pump continues to work, when defrosting run 10min (manufacturers within the set). Or detected condenser tube surface temperature greater than 15 ° c, the unit will run out of defrosting, transported back to the original heating in the running state. Auto defrost feature set, General manufacturers depend on defrost, the factory are debug, users as long as the specification requirements, observation of processes, such as the discovery of the phenomenon of defrosting is not in place, you should contact with manufacturers, manufacturers of technical staff, under the guidance of defrost setting adjustment, so as to avoid the unit using a mine barrier.
Set the debug runtime is generally not less than 4h, to complete all of the basic functionality of the test, you should shut down the host, the demolition of testing tools, electrical wiring Terminal retightened once, lest the terminals loose due to mechanical failure, then the cover in place. In order to ensure the cleanliness of the water system, again cleaning unit into the Department's water filter. Confirm the unit and the system is running without problems before they let the unit properly.
Unit testing is not a problem, debugging should direct the user to press the product usage manual operation rules for use in air-conditioning and, if necessary, also for demonstration actions until the user can correct use.