Unitrol PROCESS 8500, Manual

Page 1: ...PROCESS WATER CHILLER MODELS 8500 8501 8550 8551 UNITROL ELECTRONICS INC 702 LANDWEHR ROAD NORTHBROOK IL 60062 847 480 0115 info unitrol electronics com Shown with option 8510 stacking stand...

Page 2: ...end a local refrigeration contractor to do warranty service In this case Unitrol will pay contractor directly To be covered by this warranty please follow the following procedure 1 Contact the Unitrol...

Page 3: ...this chiller will provide years of superior service MODEL NUMBER SERIAL NUMBER DATE OF MANUFACTURE REFRIGERANT 407C 4400000 OPTIONS CHILLER MODEL LINE VOLTAGE AND PHASE STANDARD WATER PUMP 8500 25 ton...

Page 4: ...NOTES...

Page 5: ...nitial Startup 11 Temperature Sequence 12 Control Panel and Fault Lights 13 Condition Indicator Lights 13 Fault Lights Low Water Flow 14 Low Freon Fault 15 High Freon Fault 15 Dew Point Control Faults...

Page 6: ......

Page 7: ...g stand has pockets to receive leg pads on MODULE C 3 Install 2 brass pipes with union between the pump and right side of MODULE A and the tank bulkhead fitting on the left side of MODULE B When insta...

Page 8: ...ht through one of the grommeted hole in the right side bottom of the base pan and up into the knockout on the black compressor junction box to a local fused disconnect The fused disconnect should be n...

Page 9: ...DELAY MINIMUM WIRE GAUGE 8500 8550 MODULE A 480 3 35A 10 8500 8550 MODULE A WITH 10HP WATER PUMP 480 3 45A 8 8500 8550 MODULE B 480 3 20A 12 8500 8550 MODULE B with optional backpressure pump 480 3 30...

Page 10: ...MODULE C to MODULE C For MODULE B the hole is on the left side Run the flexible cable across the basepan to reach the fitting on the black junction box 2 Connect each cable to the waiting fitting on t...

Page 11: ...to keep the internal water tank filled if there are any leaks in the outside water system A float valve is provided in the water tank PIPE INSULATION ALL PIPES FROM THE CHILLER AND RETURNING TO THE CH...

Page 12: ...e to a drain since water can be sent into a bucket whenever it is desired to flush out this filter 3 Install this Y strainer filter supplied with this chiller to the 2 bulkhead marked WATER RETURN loc...

Page 13: ...lamps 5 Set outside water valves as follows TURN ON VALVES 3 4 and M TURN OFF VALVES 1 and 2 6 Remove the expanded metal panel on MODULE B 7 Turn water on at the MAKE UP WATER IN port and the tank sho...

Page 14: ...scuss this problem 3 Because you will be filling all of the outside pipes it is possible that the water tank will drain down If this happens turn the MASTER ON OFF switch to OFF until the makeup valve...

Page 15: ...display the tank temperature and the code Dpl dew point lockout This will continue until the tank temperature rises 3 F above the dew point temperature of the room 4 If the set point SP that was ente...

Page 16: ...SV temperature and the water tank temperature is above the DEW POINT at that moment 2 If you want to change this number press the SEL button a second time and then use the or button to increase or de...

Page 17: ...utomatically in about 5 minutes If MODULE A is working properly turn the MASTER ON OFF switch OFF Turn on line voltage to MODULE B and MODULE C Turn the MASTER ON OFF switch to ON IF ANY COMPRESSOR ST...

Page 18: ...temperature FOR CHILLERS WITH OPTIONAL DEW POINT CONTROL IN ALL CASES BELOW IF THE TANK WATER TEMPERATURE IS BELOW THE DEW POINT NO COMPRESSORS WILL OPERATE THE SYSTEM WILL WAIT UNTIL THE TANK WATER T...

Page 19: ...ompressor even if water temperature is above the temperature controller set point SP or SV LOW FREON FAULT Glows when Freon pressure is below 50psi This will prevent operation of the compressor even i...

Page 20: ...the overload can be pushed to reset the contactor However the cause should be found and corrected Otherwise this contactor will continue to trip Tripping of the overload can be caused by one of the fo...

Page 21: ...e Freon leak repair and recharge the system A LOW FREON fault can sometimes clear by itself for a short time but will come back rapidly You may hear the compressor turning ON and OFF rapidly In this c...

Page 22: ...OT DAYS If the room temperature exceeds 90 F it is possible that the small reduction caused by even a clean intake air filter will cause the system to overheat and trip the HIGH FREON safety switch Re...

Page 23: ...er than 0 F and above 105 F This would happen if this humidity sensor has failed The display will show The alarm will sound and a pilot duty dry contact between terminals C5 and NO5 on the Dew Point c...

Page 24: ...water flow is still required set the water valves as shown on the plumbing diagram as follows CONNECTING LOAD TO BUILDING LINE AND DRAIN TURN OFF VALVES 3 4 and M TURN ON VALVES 1 and 2 CONNECTING LO...

Page 25: ...commercially available aluminum fin spray solvent such as Nonacid condenser coil cleaner W W Grainger 5W403 Follow directions on the product label WATER TANK CLEANING Remove the cover of the water ta...

Page 26: ...own below Valves are installed to allow fast switchover to city water and drain if needed TO OPERATE ON CHILLER Open valves 1 4 and M Close valves 2 and 3 TO OPERATE ON CITY WATER Open valves 2 and 3...

Page 27: ...DOCUMENTS UNITROL MODEL 8500 8501 8550 8551 21...

Page 28: ...DOCUMENTS UNITROL MODEL 8500 8501 8550 8551 22...

Page 29: ...t the corner braces should be installed so that the end goes above the horizontal tube as shown This sets the top of the four corner braces above the top tubing as shown in this photo Assemble per thi...

Page 30: ...on top of the stand and place the chiller foot pads between the front and rear top braces There should be about space all around It is not necessary to bolt the chiller since it will be locked in plac...

Page 31: ...UNITROL ELECTRONICS INC 702 LANDWEHR ROAD NORTHBROOK ILLINOIS 60062 847 480 0115 techsupport unitrol electronics com...