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Marrone & Co., Inc. 

2730 Maximilian Drive • Houston, Texas 77032 • Phone (281) 227-8400 • (800) 473-9178 

Fax (281) 227-8404 • www.waterchillers.com 

Guide_DeltaPLC-ProgramOperations-A1_020816.docx 

 

 

IMPORTANT!  Continuous restarting of the system with a fault is considered abuse and will void all warranties. 

 

The Temperature Controller has additional normally open contacts available that will close during an alarm situation. 
-   

 

Alarm Output 1  indicates that the Process temperature has exceeded the allowable temperature range limits. 

-   

 

Alarm Output 2  indicates that the Process temperature has exceeded the allowable temperature limits. 

-   

 

Alarm Output 3  indicates that the Process temperature has deviated from the set value by the deviation high or low 

values. 

FAULT CODE LIST 

FAULT 

CODE 

DESCRIPTION 

9 0 0 0  

Only shown if there are no settings in the DTB Temperature Controller  

9 1 0 0  

Set Value Temperature Outside the Permitted Range (Will reset the nearest range temperature limit) 

9 1 1 0  

Process Value has Deviated Higher Than Set Value Limit without lowering within time period (approx 30 minutes).  If this occurs 
and the cause is known, then raise the SV to be closer to the PV to permit recirculating system. 

9 1 2 0  

Process Value Temperature Too High 

9 2 0 0    

Refrigerant Pressure Too High at Startup (High Pressure Switch is open) – If manual switch, then press reset. 

9 2 1 0    

Refrigerant Pressure Too High during Operation (High Pressure Switch is open) – If manual switch, then press reset. 

9 3 0 0  

Refrigerant Pressure Low at Startup or During Pump Operation (Low Pressure Switch is open) 

9 3 1 0  

Refrigerant Pressure Low during Compressor Operation after Initial Compressor Start Bypass Timer 

9 4 0 0  

No Fluid Flow.  Flow was not established in the initial time period (typically 5 seconds) 

9 4 1 0  

Fluid Flow Loss for more than time period or Excessive Cycling of Flow Switch within time period 

9 5 0 0  

Refrigerant Suction Temperature Low (Flow Safety Thermostat is open.)  Possibly due to inconsistent flow 

9 5 1 0  

Refrigerant Suction Thermostat Open at Startup (Suction Temperature Low) 

9 6 0 0  

Leaving Fluid Temperature Too Low (Freeze Thermostat is open) 

9 7 0 0  

Either: 1) Pump Safety Circuit has tripped or 2) Low Tank Level at Start 

9 7 1 0  

Either: 1) Pump Safety circuit was tripped or 2) Low Tank Level or Excessive Cycling of Tank Level Switch 

9 8 0 0  

Loss of Communications in Pump Mode (Typically, turn switch off and back on to re-establish communication) 

9 8 1 0  

Loss of Communications between Temperature Controller and PLC 

9 8 2 0  

Loss of Communications between Temperature Controller and Temperature Sensor/Thermocouple  

If further assistance is needed regarding the Contact Cold Shot Chillers with any concerns or issues, as needed.  

Example of Temperatures of Operation 

Code 

Description 

Detail 

Typical Values 

(°F) 

TLH 

Temperature Limit High 

The highest temperature at which all functions will stop. 

120 

DTH 

Deviation Temperature High 

Difference above Set Value that a timer starts. If temperature does not lower, then fault. 

  SP + Δ30=85  

RH 

Range High 

Highest value that can be entered as a Set Value 

80 

DU2 

Deviation Upper 2 

Hysteresis value above Set Value plus 1°F 

58 

DU1 

Deviation Upper 1 

Hysteresis value above Set Value 

57 

SV 

Setpoint Value 

The desired temperature entered in the controller 

55 

DL1 

Deviation Lower 1 

Half of the hysteresis value below Set Value 

54 

DL2 

Deviation Lower 2 

Hysteresis value below Set Value 

53 

RL 

Range Low 

Lowest value that can be entered as a Set Value 

44 

DTL 

Deviation Temperature Low 

Deviated temperature value below Set Value which resets all cooling functions. 

SP - Δ7=48 

TLL 

Temperature Limit Low 

Lowest temperature which resets all cooling functions. 

  37 

 

CTS 

Cooling Hysteresis 

The number of degrees from Set Value that cooling operations start and stop. 

SP Δ 2 

Communication Option via PLC RS-232 Communication 

Via DVP14SS2 COM1 port 

 

Register 

Address 

Description 

Function 

Com1 Port: RS-232 
PLC Modbus address: 1 
Data Length: 7 bit 
Stop bits: 1 
Parity: Even 
Baud rate: 9600 

 

D0 

(Machine 

mode) 

1000hex 

1   is Cooling Cycle mode. 
2   is Pump Only mode. 
3   is Off (selector switch is in OFF position). 

Selector Switch Position 

 

D1 

1001 hex 

SV 

Set Value 

 

D2 

1002 hex 

PV 

Process Value 

 

D3 

1003 hex 

Fault# 

Fault # 

 

D4 

1004 hex 

1   is Cooling Mode Status – OK 
0   is Cooling Mode Status – Not Active 

Cooling Mode Status 

 

Summary of Contents for ACWC-180-EM-DR-LT-0-5

Page 1: ...Houston Texas 77032 Phone 800 473 9178 281 227 8400 Fax 800 473 9175 281 227 8404 www waterchillers com INSTALLATION OPERATION AND MAINTENANCE INSTRUCTIONS ACWC 240 E model shown AIR COOLED WATER CHI...

Page 2: ...ient fan control Casters optional d M20 Suitable for outdoor use to 20 F ambient Hot Gas Bypass and or Wind Baffles may be included Casters optional 7 Electrical Power See specification sheet Variatio...

Page 3: ...has been inspected at the factory and released to the transportation agency without known damage Inspect carton s exterior for evidence of rough handling in shipment Carefully remove protective wrap...

Page 4: ...unit to ensure proper oil return to compressors and fluid draining 2 When unit is in proper location secure unit to foundation or on vibration isolators as needed required by local requirements Fasten...

Page 5: ...efrigerant Charge E ELECTRICAL POWER AND CONNECTIONS1 1 POWER SUPPLY Field wiring must comply with national and local codes a Install a branch circuit fused disconnect of adequate size to handle start...

Page 6: ...ezing can occur from the external ambient or internal system temperatures 2 INTERNAL The evaporator or other heat exchanger is the primary component that is susceptible to freezing even during normal...

Page 7: ...rating of the chiller 2 Some conditions are a Ambient conditions for air cooled systems b Condenser fluid for water cooled systems c Type of fluid being chilled d Design and setup of the chiller e Lea...

Page 8: ...illed with fluid prior to starting e Systems with an open tank are typically capable of bleeding excess air that is returned to the tank when the system is operating Piping in and out are typically be...

Page 9: ...LED readout which is an indication of the current temperature of the fluid in the chiller tank or Leaving Fluid Temperature depending on the specific chiller design 8 COOLING CYCLE Unit is now ready t...

Page 10: ...F At this temperature an internal bi metal disk valve opens and causes the scroll elements to separate which stops compression Suction and discharge pressures balance while the motor continues to run...

Page 11: ...SAFETY LPS a Monitors the pressure of the refrigerant suction line and will automatically open when the pressure drops below the set point and will automatically reset when pressure is above the non a...

Page 12: ...ted valves similar to MCSO however it can be setup to change automatically based on a system safety situation 23 TANK LEVEL OPTIONS a Float Valve a Located inside the tank the float valve is a mechani...

Page 13: ...with wire brush and or abrasive clothes and then the surface can be recoated to reduce future corrosion For severe environments use a durable epoxy paint that can create an oxygen barrier c Fasteners...

Page 14: ...ecome jagged or splattered to avoid premature compressor and or pump failure Contactor points are consumable and their life is dependent on the amount of use and power characteristics at the unit 11 R...

Page 15: ...t unless issue has been resolved Troubleshoot the switch DO NOT BYPASS IMPORTANT This condition can occur when the fluid in the evaporator nears freezing 9 Flow Switch Tripped switch open 9 Determine...

Page 16: ...leak and recharge 4 Overcharged system 4 Remove refrigerant adjust charge FROSTED LIQUID LINE AFTER DRIER 1 Restricted filter drier 1 Remove restriction or replace COMPRESSOR WILL NOT LOAD UNLOAD HOT...

Page 17: ...ply TEMPERATURE CONTROLLER ERROR 1 Temperature indication not accurate 1 Verify temperature sensor is in good condition and mounted properly Adjust the offset Typically it is only adjusted a few degre...

Page 18: ...hnical Specification C Physical Installation Drawings D Electrical Drawings E Component Technical Pump options etc when available F Parts Warranty G Labor Warranty if included H Startup Checklist MNL_...

Page 19: ...r starter or overload or the Tank Level is above the low level if included 2 Any issues with these items will result in a fault There is an initial delay bypassing the flow switch to permit flow to st...

Page 20: ...switch is turned off or a fault occurs DISPLAYS Power ON typical Only at startup Normal display PV b190 DTB series Firmware V1 90 PV 51 3 Present Value SV r r Output type Relay and Relay SV 50 0 Set...

Page 21: ...ow 9600 Leaving Fluid Temperature Too Low Freeze Thermostat is open 9700 Either 1 Pump Safety Circuit has tripped or 2 Low Tank Level at Start 9710 Either 1 Pump Safety circuit was tripped or 2 Low Ta...

Page 22: ...d Rate 9600 LEN Communication Data Length 8 Prty Communication Parity Bit Even StoP Communication Stop Bit 1 Value Set Codes Code Description B ACTUAL SETTINGS r S Operation Mode rUn SP Decimal point...

Page 23: ...PT LIFS 000 100 0 1 2730 Maximilian Drive Houston Texas 77032 Phone 800 473 9178 281 227 8400 Fax 800 473 9175 281 227 8404 www waterchillers com Liquid Flow Switch...

Page 24: ...S Fan Cycling Pressure Switch FST Flow Safety Thermostat FZT Freeze Safety Thermostat GND Ground HG Hot Gas HPS High Pressure Switch L Line LAR Low Ambient Relay LAT Low Ambient Thermostat LFS Liquid...

Page 25: ...in a location away from sources of excessive heat and within the specified ambient operating conditions See Technical Specifications for ambient operating conditions IMPORTANT Use this P266 Single Ph...

Page 26: ...ctronic Pressure Transducer 0 to 52 bar 0 to 754 psi total range with a 1 4 in SAE Female Flare connection and a 2 meter 3 1 ft cable P266xxx x Product P266xxx x Single Phase Condenser Fan Speed Contr...

Page 27: ...alves filter drier pump down valves fan cycling head pressure controls Process Fluid Components Bronze Y strainer with 20 mesh stainless steel screen Pumps are stainless steel centrifugal Tanks are in...

Page 28: ...0 0_ 0414 doc PUOD 240 003 0 0 3 Hp 3 Motor ODP Pump with 5 5 Impeller and 0 250 Vane at 3500rpm ASP SSPC Pump Motor Assembly Exploded View If needed the pump label is located on the pump casing near...

Page 29: ...orts Condensing Area Access Panel Line Voltage Temperature Controller Control Panel PUMP COOL OFF Power Switch High Pressure Reset NOTES Unit should be installed with at least 4 clearance on all sides...

Page 30: ...it System 2 3 5 2015 SCALE NTS DWG_RefrigerantCircuit Ref Chw ACWC SingleCircuit Typical_0215 vsd SHEET 1 NOTES All specifications and designs are subject to change without notice Hot Gas Bypass optio...

Page 31: ...SHEET 2 CHILLER PUMP WATER SUPPLY OUT MANUAL BYPASS STAINLESS STEEL TANK WITH SHOE BOX LID WATER RETURN IN DRAIN STAINLESS STEEL COPPER BRAZED PLATE EVAPORATOR TEMPERATURE SENSOR Temperature Controlle...

Page 32: ...mp PLC Programmable Logic Controller PS Power Supply RC Run Capacitor SW1 Selector Switch Pump Off Cooling SW2 Selector Switch Process Pump SW3 Local Remote Switch TB1 Terminal Block 1 for Internal TB...

Page 33: ...PLC INPUTS PLC OUTPUTS RED BLK TRAN1 PS 24VDC HPS VIO GRA YLW X1 X0 X2 S S WHT SW1 1 SW1 2 BRN BLU ORN GRN X3 X4 X5 X7 X6 BLK BLK PAGE NOTES 1 Control transformers must be wired tapped for the approp...

Page 34: ...ontrol with External Supplied Control Voltage 1 2 33 32 OPTION CODE VARIATIONS RS Remote System ON OFF Control with internal supplied 24VDC requiring Dry Contacts RS V Remote System ON OFF Control wit...

Page 35: ...Notes...

Page 36: ...MAINTENANCE RECORD DATE PROCEDURE PERFORMED...

Page 37: ...ll piping is connected properly as appropriate Yes No 12 All chilled water valves are open as appropriate Yes No 13 Crankcase heaters energized for 24 hours before start up Yes No 14 Outdoor piping wr...

Page 38: ...__________________________________________________________________ __________________________________________________________________________________________________ __________________________________...

Page 39: ...ight charges to ship these parts EXCLUSIONS The foregoing provisions state the exclusive remedy for any breach of warranty or any other claim in respect to the product described on the reverse side of...

Page 40: ...s that are not manufacturing defects and are therefore not included in this Limited Warranty 1 Damage to unit or unsatisfactory operation due to improper cleaning or use of unit in corrosive atmospher...

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