- LG Comfort Cooling
Contents
1. LG Synchro Unit Commissioning Procedure How to Use this guide This guide book has been designed to set out a procedure for commissioning LG s Synchro split units It is designed to be very simple to follow and assumes the engineer has never commissioned one of these systems before At the end of this guide there is a commissioning sheet included this should be completed and returned A copy of this information will be useful when processing any warranty claims for the equipment Some Definitions Synchro Systems have a single condenser piped to 2 3 or 4 indoor units These are used to give better air distribution than a single fan coil It is essential that all the fan coils serve the same area as they all operate as one The end user only controls the master fan coil the slaves are controlled automatically The Fan Coil capacity must match the Condenser capacity the only permitted combinations are those listed in the Sales Booklet or Service Manual When a Synchro System is used addressing of the Outdoor Unit is required prior to it being powered up and a set procedure followed see Pages 4 6 for instructions Ignoring these instructions will result in the system failing to operate correctly This Addressing procedure must be carried out as part of the Commissioning procedure on new systems or whenever an Indoor or Outdoor PCB is replaced LGEUK AC Department June 2007 Synchro Commissioning 1 Pressure Testing Ensur2. When group control is used set to Group or GR1 this is not available on Synchro Systems When centralised controls are used set to the third position GR2 LGEUK AC Department June 2007 Synchro Commissioning 10
3. Non Inverter Units are pre charged for 5M of main pipework 20M Total of branch pipe work Main pipework add 50 grams per meter over 5M Branch pipework add 30 grams per meter over 20M UU100 Non Inverter Units are pre charged for 5M of main pipework 20M Total of branch pipe work Main pipework add 50 grams per meter over 5M Branch pipework add 30 grams per meter over 20M additional 20 grams per meter for all 3 8 Liquid Line branch pipework size 48 indoor units LGEUK AC Department June 2007 Synchro Commissioning 3 Before Powering up the System To avoid complications the following will assist commissioning Disconnect all centralised controllers service computers additional PC boards and field supplied condensate pumps this will make life simpler for you These can be added and tested once the system operation is proved to be correct Group Control Group control is not possible on Synchro Systems the Remote Controller must only be wired to a single Indoor Unit and the Group Switch on the rear of the remote controller must be set to single SG LGEUK AC Department June 2007 Synchro Commissioning A When a system is to be set up as a Synchro System addressing is required Addressing The addressing sequence should be carried out as part of the commissioning procedure or when replacing indoor or outdoor unit PCB Addressing is carried out at the outdoor PCB Set up the PCB as shown below with
4. 054 V a x kvl i D L BS ZONE Si P ad gt oN FANE Ci HE bur yy Bit a AN wd e e E a a CN CENTRAL _ TON CENTRAL 12 za a LGEUK AC Department June 2007 Synchro Commissioning 6 Testing the Unit Once you have completed the pressure tests evacuation additional gas charge and Address settings you can commission the system and record its performance Turn the fan coil coils in cooling mode set the temperature to 18 C or test mode and check the air off temperatures of every fan coil Test Mode Using a hard wired controller Press the house button and the hour down button for 3 seconds LO will appear During Test mode the unit will run for 18 minutes without using the ambient air Thermistor all safety functions will still operate To exit test mode press ON OFF button once or wait 18 minutes and the fan coil will return to normal operation Test Mode with Infra red controller Press the forced operation button on the front of the fan coil for 5 seconds the unit will beep it will now start in test mode on units with an LED display LO will be displayed During Test mode the unit will run for 18 minutes without using the ambient air Thermistor all safety functions will still operate To exit test mode press ON OFF button once or wait 18 minutes and the fan coil will return to normal operation LGEUK AC Department June 2007 Synchro Commissioning 7 Recording Commissioning d
5. ata Cooling mode When all the units are running the performance of the system should be checked Do not take any measurements for the first 5 minutes of operation Condensing Unit At the power input terminals measure Voltage before compressor starts Voltage when compressors are running check volt drop is less than 5 Current drawn by condensing unit compare with the nameplate current At the suction service valve measure pressure should be to approximately 125 psig At the discharge service port measure pressure should be to approximately 340 psig Fan Coils Measure air off and air on temperatures in a room with an ambient temperature of 21 C an air off temperature of 10 C or better should be achieved lf air off and air on temperatures are the same you better check your pipe work isn t crossed Once satisfactory readings have been taken the unit should be tested in heating mode Heating mode When all the units are running the performance of the system should be checked Do not take any measurements for the first 10 minutes of operation Condensing Unit Measure current drawn by condensing unit compare with the nameplate current At the service valves measure discharge pressure it should be at least 360 psig Fan Coils Measure air off and air on temperatures in a room with an ambient temperature of 21 C an air off temperature of 35 C or better should be achieved LGEUK AC Department June 2007 Synchro Commissio
6. e you reach this level continue to vac the system for a further 15 minutes If the system holds the vac at the level achieved there is no water vapour present in the pipe work However if the pressure raises it means water vapour is boiling off in the tubes You must repeat the vacuuming process for a further 15 minutes until no further rise is experienced 4U 35 30 25 20 15 10 5 0 Temperature C 5 T 9 11 13 16 20 25 30 Pressure Torr Steam table of water LGEUK AC Department June 2007 Synchro Commissioning 2 Additional Refrigerant Charge Once a suitable vacuum has been achieved additional charge may need to be added lf the interconnecting pipe work is longer than the stated length additional refrigerant charge will need to be added You must establish how much additional refrigerant charge is required this must be done accurately and the charge weighed in with refrigerant scales Make a note of the charge added as this will be useful later in the unit s life R410A Synchro Units Additional Refrigerant Charge UU48 Non Inverter Units are pre charged for 30M of main pipework 20M Total of branch pipe work Main pipework add 70 grams per meter over 30M Branch pipework add 30 grams per meter over 20M UU48W UU60W Inverter Units are pre charged for 30M of main pipework 20M Total of branch pipe work Main pipework add 50 grams per meter over 30M Branch pipework add 30 grams per meter over 20M UU72
7. e that all service valves are shut tight prior to pressure test this will avoid nitrogen leaking past the valves into the condensing unit All Air Conditioning systems must be pressure tested before refrigerant is released into the pipe work Pressure testing must be carried out using Oxygen free dry Nitrogen only and MUST be carried out on all the service ports If you unit has two service valve connect two pipes if it only has one port only one gauge line can be used Pressure testing tends to be carried out in stages generally it is considered good practice to test the pipes prior to connection to the condensing unit to avoid leaking into the condenser past the service valves The pipe work should be pressure tested for 24 hours in three stages Stage 1 3 0 Bar for minimum 3 minutes Stage 2 15 0 Bar for minimum 3 Minutes Stage 3 38 0 Bar for minimum 24 hours Make a note of the temperature at the time of the pressure test as the pressure will fall by 2 psig for every 1 C drop in ambient temperature and rise by 2 psig for every 1 C temperature rise Evacuation The system will now need evacuating Evacuation MUST be carried out on all the service valves If you unit has two service valve connect two pipes if it only has one port only one gauge line can be used The time of evacuation is purely a function of your vac pump and the ambient temperature With reference to the chart below check the Torr required at the ambient temperature onc
8. ning 8 Some Additional Settings On the back of the remote controller there are additional switches Top Switch for Sensor Room Temperature Setting Position Remo the unit will use only the sensor in the remote controller not recommended as itis not very sensitive Position Indoor factory set the unit will only use the return air sensor in the Indoor Unit for temperature control Position 2TH Remo Indoor the unit will use both the Indoor Unit return air and the remote controller sensors 1 Two Thermistor System 1 Open the rear cover of the wired remote controller to set the mode 2 Select one of three selectable modes as follows Position 1 The room temperature is controlled by the thermistor of the main body Position 2 The room themperature is controlled by the thermistor of the wired remote controller control the temperature according to the position of wired remote controller Position 3 The room temperature is controlled by lower temperature between the temperature of main body and of remote controller sensor 3 Move the slide switch to set position Room Temp sensor Slide switch for 2 Thermistor Slide switch for celing heighi 4 Close the rear cover and check if it works normally LGEUK AC Department June 2007 Synchro Commissioning 9 Middle Switch for Ceiling Height Default ESP When ceiling cassettes are being installed in areas with high or low ceilings the fan speeds can be adj
9. the power to the system switched off Switch on the power wait 10 seconds then press the ADDR TEST button small black button under large capacitors for 10 seconds the green LED will flicker release button leave system to auto address for 10 minutes Power off system for 3 minutes power back on now the system is ready to run UU48W UU60W These units are addressed using a set of 3 plugs marked ADDR1 ADDR2 ADDR3 Settings are as follows One Indoor Unit Leave All 3 Plugs in Two Indoor Units Remove Plug ADDR1 ADORI CE a DISP JADDR2 c to z z x Z y On P a P 5 E at pw a x i z A PA if 5 3 a co fi es z f 3 2S o aame z Ee pi syi m as h c PEJ CHASINI CioK ICOSK ji S gt E gt CAIR PI DDR3 LGEUK AC Department June 2007 Synchro Commissioning 5 UU48 UU72 UU100 These units are addressed using a set of dip switches marked Zone SW1 individually marked 1 2 3 4 Settings are as follows One Indoor Unit Switch 1 Up Two Indoor Units Switches 1 2 Up in in the On Position the On Position 6SZ71A2Zl 583 68ZOA90246A A B 054 V da ZONE Sun A A A na w cR CENTRAL gt c DO SO L aae NZ is aa CENTRAL Three Indoor Units Switches 1 2 3 Four Indoor Units Switches 1 2 3 4 Up in the On Position Up in the On Position 4 ND oO P 6871 A20583 6870A90246A tae 6870AS0246A A B 054 V G a koee m B
10. usted to suit In Position V L or 1 the fan speed is reduced for ceiling heights below 2 7 m In position FH or 2 factory set the fan will run at normal speed this is the setting for ceilings of 2 5 2 9 m In position V H or 3 the fan speed is increased for ceiling heights of 3m 2 Adjusting air volume to the height of ceiling Cassette type You can choose the RPM or air volume of indoor motor according to the height of ceiling to sup ply the comfortable atmosphere to consumers Procedure 1 Choose the selectable position in the table after measuring the height of ceiling Ceiling height Mode of slide switch Change of air volume Remark more than 3 3m High Ceiling Increasing Manufactured in 27 8 3m Standard standard mode less than 2 7m Low Ceiling Decreasing 2 In the case of changing the height as high or low open the rear cover of the wired remote controller 3 Move the slide switch to the set position Slide switch for 2 Thermistor og G tup ia B Eo E m eeta U ka s ie x Pe 4 Close the rear cover and check if it works normally Switch for Group control When more than 1 Fan Coil is mounted in a single room each with it s own Outdoor unit and is to be controlled from a single remote controller this is called group control A switch setting on the back of the Remote Controller must be made to accommodate this Factory setting is single or SG this setting must be used on Synchro Systems
Download Pdf Manuals
Related Search