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FORM 145.32-IOM4 (818) 

31

 

MICROPROCESSOR CONTROLLER 

The  microprocessor  control  system  is  specifically 

designed for single and dual stage air cooled systems. 

The control system interfaces with a conventional type 

thermostat. 

Unit  shall  be  complete  with  self-contained  low-

voltage control circuit

Unit  shall  incorporate  a  lockout  circuit  which

provides reset capability at the space thermostat or

base  unit,  should  any  of  the  following  standard

safety devices trip and shut off compressor.
-

Loss-of-charge/Low-pressure switch

-

High-pressure switch

-

Condensate Overflow protection switch

Unit  shall  operate  with  conventional  thermostat

designs and have a low voltage terminal strip for

easy hook-up.

Unit control board shall have on-board diagnostics

and fault code display.

Standard controls shall include anti-short cycle and

low voltage protection

Control board shall monitor each compressor and

refrigerant safety switch independently.

Control board shall have random start feature

Control board shall retain last 5 fault codes in non

volatile memory which will not be lost in the event

of a power loss.

OPERATION 

For cooling the room t-stat energizes the low-voltage 

circuit between “R” & “Y1”. 

The call is passed to the unit microprocessor control, 

which  then  determines  whether  the  requested 

operation is available and, if so, which components to 

energize. 

CONTINUOUS BLOWER 

By setting the room t-stat fan switch set to “ON”, the 

supply air blower will operate continuously.  With the 

room  t-stat  fan  switch  set  to  “AUTO”,  the  blower  is 

energized whenever a cooling operation is requested. 

The  blower  is  energized  after  any  specified  delay 

associated with the operation. 

When energized, the indoor blower has a minimum run 

time of 30 seconds. Additionally, the indoor blower has 

a delay of 10 seconds between operations. 

When the room t-stat calls for cooling, the low-voltage 

control circuit from “R” to “Y1”and “G” is completed. The 

compressor  and  fan  motor  are  energized.  After 

completing the specified fan on delay for cooling, the 

microprocessor control will energize the blower motor. 

Once  the  room  t-stat  has  been  satisfied,  it  will  de-

energize  “Y1”.  If  the  compressor  has  satisfied  its 

minimum  run  time,  the  compressor  and  fan  de-

energize.  Otherwise,  the  unit  operates  the  cooling 

system until the minimum run time for the compressor 

has  been  completed.  After  the  compressor  de-

energizes, the blower is stopped following the elapse of 

the fan-off delay for cooling. 

To be available, a compressor must not be locked-out 

due  to  a  high-pressure  switch;  low-  pressure  switch; 

condensate  overflow  switch;  and  the  anti-short  cycle 

delay (ASCD) must have elapsed. 

SAFETY SWITCHES

 

Each refrigerant system is monitored to ensure it does 

not  operate  outside  of  its  intended  operating 

parameters. Safety switches are handled as described 

below. All system errors override minimum run times 

for compressors. 

High-Pressure Limit Switch 

If  a  high-pressure  limit  switch  opens,  the 

microprocessor control de-energizes the compressor, 

initiates  the  ASCD,  and  stops  the  fan.  If  a  call  for 

cooling or heating is still present at the conclusion of 

the ASCD, the microprocessor control will re-energize 

the compressor and unit fan. 

Should a high-pressure switch open three times within 

two hours of operation, the microprocessor control will 

permanently  lock-out  the  compressor.    The  system 

must  be  manually  reset  by  de-energizing  the  24  volt 

power to unit, or turning the room t-stat to the “OFF” 

position then back to cooling position. The control will 

flash a fault code indicating high-pressure lock-out. 

Low-Pressure Limit Switch 

The low-pressure limit switch is not monitored during 

the  initial  30  seconds  of  compressor  operation.  After 

the initial 30 seconds have passed, the microprocessor 

control will monitor the low-pressure switch for another 

30 seconds.  If the low-pressure switch fails to close 

after  the  30  second  monitoring  phase,  the 

microprocessor  control  will  de-energize  the 

compressor, initiate the ASCD, and stop the fan. 

Once the low-pressure switch has been proven (closed 

during the  30-second monitoring  period as described 

above), the microprocessor control board will continue 

to  monitor  the  low-pressure  limit  switch  for  any 

openings.  If the low-pressure switch opens for greater 

Содержание DSH Series

Страница 1: ...MODEL DSH024C 060C AND 096B 120B HORIZONTAL R 410A STYLE B C Issue Date August 30 2018 AIR COOLED SELF CONTAINED UNITS INSTALLATION OPERATION MAINTENANCE Supersedes 145 32 IOM4 1216 Form 145 32 IOM4 818 ...

Страница 2: ... and understood this document and any referenced materials This individual shall also be familiar with and comply with all applicable governmental standards and regulations pertaining to the task in question SAFETY SYMBOLS The following symbols are used in this document to alert the reader to areas of potential hazard DANGER indicates an imminently haz ardous situation which if not avoided will re...

Страница 3: ...e is available TABLE OF CONTENTS Safety Symbols 2 Changeability of This Document 3 Typical Installation Diagrams 4 General Information 7 Installation Pre Installation Inspection of Equipment 7 Rigging 7 Installation Site 7 Cabinet Configurations Unit Mounting 8 Separation of Units Evaporator Condenser 8 Physical Data 11 Service Clearances and Corner Weights 15 Interconnecting Refrigerant Tubing 18...

Страница 4: ...FORM 145 32 IOM4 818 4 ...

Страница 5: ...FORM 145 32 IOM4 818 5 DSH024C DSH060C SINGLE COMPRESSOR UNIT TYPICAL INSTALLATION DIAGRAM ...

Страница 6: ...FORM 145 32 IOM4 818 6 DSH096B 120B DUAL COMPRESSOR UNIT TYPICAL INSTALLATION DIAGRAM ...

Страница 7: ...FORM 145 32 IOM4 818 7 NOMENCLATURE TABLE ...

Страница 8: ... immediately Refrigerant circuit should be checked to ensure no leaks have occurred during shipment Install gauge set to high and low pressure ports to confirm pressure has been maintained and no leaks have occurred during shipment Repair any damage prior to installation to ensure safe operation RECORD ANY UNIT DAMAGE ON THE BILL OF LADING AND REPORT TO CARRIER AND FACTORY IMMEDIATELY SHIPPING AND...

Страница 9: ...aps and brackets from refrigerant piping and couplings before assembling and piping the units see pictures below 8 10 ton model shown Units may be either hung or floor mounted If unit is to be hung use all mounting points indicated regardless if unit is installed as a package or split system refer to typical installation diagram on Page 4 5 Use of minimum in dia hanger rods is strongly recommended...

Страница 10: ...cess wire into the evaporator panel 5 Remove the threaded wire bushing connecting the two electrical panels 6 Remove the unit top joining strip Take care to remove only those screws which attach the joining strip to the evaporator and condenser cabinets 7 Remove the two side cross member angles 8 Carefully pull the evaporator section away from the condenser section Take care not to damage the shor...

Страница 11: ... line set or if necessary position of unit module 3 Using a back up wrench tighten the female union nut until a definite increase in resistance is felt At this point most of threads will have been covered by the nut Ensure that the female and male bodies during any portion of the wrench installation do not rotate 4 Make note of the location of the female nut to the bulkhead Using a marker or scrib...

Страница 12: ... FIELD CONVERTIBLE OPTIONAL CONDENSER INTAKE FIELD CONVERTIBLE 3 4 NPT DRAIN CONNECTION 2 3 TON HORIZONTAL A C UNIT DIMENSIONAL DATA EVAPORATOR SECTION ELECTRICAL BOX ACCESS EVAPORATOR FAN ACCESS CONDENSER FAN ACCESS LOW VOLTAGE CONNECTION 23 75 7 18 7 00 56 00 71 88 C C 78 19 2 70 2 75 FRONT BACK FRONT ELECTRICAL POWER CONNECTION CONDENSER SECTION ELECTRICAL BOX ACCESS COMPRESSOR ACCESS EVAPORATO...

Страница 13: ...ER SECTION EVAPORATOR SECTION 35 62 C C 40 00 C C 80 50 C C 66 50 C C 69 10 86 19 ELECTRICAL POWER CONNECTION CONDENSER SECTION ELECTRICAL BOX ACCESS EVAPORATOR SECTION ELECTRICAL BOX ACCESS LOW VOLTAGE CONNECTION CONDENSER OPENINGS EVAPORATOR OPENINGS FRONT FRONT 17 50 18 50 15 00 16 00 10 12 9 73 8 13 8 75 CONDENSER FAN ACCESS EVAPORATOR FAN ACCESS 28 00 26 75 29 38 23 13 COMPRESSOR ACCESS EVAPO...

Страница 14: ... 00 4 75 17 00 25 00 21 25 10 88 85 21 80 00 1 25 1 00 CONDENSER SECTION ELECTRICAL BOX ACCESS EVAPORATOR SECTION ELECTRICAL BOX ACCESS EVAPORATOR BLOWER DRIVE ACCESS PANEL FILTER ACCESS BOTH SIDE CONDENSER BLOWER DRIVE ACCESS PANEL COMPRESSOR ACCESS PANEL CONDENSER OPENING 48 00 29 38 33 38 4 94 2 63 38 13 30 13 1 56 1 00 2 19 23 88 20 94 2 25 8 56 39 88 3 4 NPT DRAIN CONNECTION EVAPORATOR OPENIN...

Страница 15: ...SECTION ELECTRICAL BOX ACCESS EVAPORATOR SECTION ELECTRICAL BOX ACCESS EVAPORATOR BLOWER DRIVE ACCESS PANEL FILTER ACCESS BOTH SIDES CONDENSER BLOWER DRIVE ACCESS PANEL COMPRESSOR ACCESS PANEL CONDENSER DISCHARGE 61 00 29 35 33 25 4 94 2 5 38 10 30 10 1 58 1 25 2 20 11 26 41 79 3 4 NPT DRAIN CONNECTION EVAPORATOR DISCHARGE 2 94 TOP VIEW TX VALVE FILTER DRIER ACCESS PANEL 1 08 20 52 21 27 70 88 18 ...

Страница 16: ...ZONTAL A C UNIT SERVICE CLEARANCES SUPPLY AIR RETURN AIR CONDENSER INTAKE CONDENSER DISCHARGE CONDENSER SECTION EVAPORATOR SECTION FRONT CONDENSER FAN ACCESS EVAPORATOR FAN ACCESS 36 IN MINIMUM CLEARANCE 36 IN MINIMUM CLEARANCE 4 IN MINIMUM CLEARANCE FOR DRAIN TRAP ...

Страница 17: ... SHOWN CONDENSER INTAKE RETURN AIR SUPPLY AIR 8 TON HORIZONTAL A C UNIT SERVICE CLEARANCES EVAPORATOR SECTION CONDENSER SECTION EVAPORATOR SECTION CONDENSER SECTION TOP VIEW 4 IN MINIMUM CLEARANCE FOR DRAIN TRAP 36 IN MINIMUM CLEARANCE 36 IN MINIMUM CLEARANCE 36 IN MINIMUM CLEARANCE BACK VIEW ...

Страница 18: ...FORM 145 32 IOM4 818 18 UNIT CORNER WEIGHTS ...

Страница 19: ... checking all field brazed joints After completion of the leak check evacuate the interconnecting lines to hold a 350 micron vacuum If gauge pressure rises above 500 microns in one minute then evacuation is incomplete or the system has a leak RECOMMENDED REFRIGERANT LINE SIZES Model LESS THAN 75 LINEAR FEET LIQUID LINE SUCTION LINE DSH024C 3 8 3 4 DSH036C 3 8 3 4 DSH048C 1 2 7 8 DSH060C 1 2 7 8 DS...

Страница 20: ...al electrical codes when making electrical connections Units are completely factory wired for normal supply voltages i e 208 230 460 575V 3Ph 60Hz Confirm unit specifications by checking unit data plate The factory wiring terminates in two boxes one in each section of the unit The electrical control boxes are located behind outer access panels Each electrical compartment has its own control cover ...

Страница 21: ...FORM 145 32 IOM4 818 21 TYPICAL WIRING SCHEMATICS ...

Страница 22: ...FORM 145 32 IOM4 818 22 ...

Страница 23: ...30 3 60 2 15 9 110 0 3 00 8 5 3 00 8 5 52 78 60 DSH120B4 460 3 60 2 7 1 52 0 3 00 4 2 3 00 4 2 24 38 30 DSH120B5 575 3 60 2 5 1 39 5 3 00 3 4 3 00 3 4 18 28 20 ELECTRICAL DATA OVERSIZED EVAPORATOR MOTOR MODEL VOLTAGE COMPRESSOR EVAP FAN COND FAN MCA MAX FUSE CCT BKR AMP QTY RLA LRA HP FLA HP FLA DSH048C2 208 230 3 60 1 13 8 83 1 1 00 3 1 1 50 4 4 24 75 35 DSH048C4 460 3 60 1 6 2 41 0 1 00 1 5 1 50...

Страница 24: ...rive3 0 8 1 0 OUTDOOR CFM AVAILABLE EXTERNAL STATIC PRESSURE Inches W C 0 0 0 2 0 4 0 6 0 8 SUPPLY CFM 0 0 0 2 0 4 0 6 SUPPLY AIR BLOWER PERFORMANCE RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 800 453 0 06 534 0 09 609 0 11 679 0 14 744 0 16 866 0 21 969 0 26 1065 0 33 1000 566 0 13 633 0 16 695 0 19 755 0 21 812 0 24 917 0 30 1016 0 38 1200 680 0 23 735 0 26 789 0 29 840 0 33 ...

Страница 25: ...0 1 2 Standard Factory Drive Hi Static Drive Factory Drive 0 75HP Low Static Drive3 1 4 Hi Static Drive 1 0HP 1 2 SUPPLY AIR BLOWER PERFORMANCE RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP Hi Static Drive 1 5HP 1600 511 0 25 562 0 30 612 0 34 658 0 38 703 0 43 786 0 50 863 0 59 935 0 68 1002 0 78 1066 0 86 1800 575 0 36 620 0 41 666 0 45 708 0 50 749 0 55 826 0 6...

Страница 26: ...BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP Standard Factory Drive 3 HP Optional Oversized Motor 5 HP 6400 691 1 98 747 2 24 800 2 52 850 2 80 898 3 08 945 3 36 990 3 66 1033 3 96 1075 4 26 SUPPLY AIR BLOWER PERFORMANCE SUPPLY CFM AVAILABLE EXTERNAL STATIC PRESSURE Inches W C 0 2 0 4 0 6 0 8 1 0 1 2 1 4 1 6 1 8 2 0 RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM...

Страница 27: ...6 68 2 0 3 0 1VP34X5 8 7 2 AK74H AX49 DSH048C 470 694 1 5 145 88 5 2 0 3 0 1VP34X7 8 7 7 AK79H AX54 DSH060C 525 775 1 5 145 88 5 2 0 3 0 1VP34X7 8 6 9 AK71H AX52 DSH096B 515 686 3 184 88 5 2 8 3 8 1VP44X1 1 8 10 2 AK104H AX54 DSH120B 640 854 3 184 88 5 2 8 3 8 1VP44X1 1 8 8 2 AK84H AX57 Frame Eff Pitch Dia Browning Pitch Dia Browning Size in Part No in Part No DSH024C 614 906 0 5 56 62 2 0 3 0 1VP...

Страница 28: ...speed is accomplished as follows 1 Loosen belt tension by moving motor towards the blower shaft via the adjustable mounting 2 Loosen the set screw in the adjustable motor pulley flange Remove external key on pulleys 4 in diameter and larger 3 Slower speed will increase when moveable flange is adjusted towards the fixed flange closed Blower speed will decrease when the moveable flange is adjusted a...

Страница 29: ...t located on the liquid refrigerant line leaving the condenser The pressure controller complete with terminal connection blocks for wiring is attached to a field installed mounting bracket Appropriate mounting hardware for the pressure control module and the damper actuator motor are provided with the kit A routing hole is provided in the condenser corner panel near the actuator mounting location ...

Страница 30: ...itch any two wires at contactor if blower rotation is not correct There is no negative impact on durability caused by operating three phase Scroll compressors in the reversed direction for a short period of time under one hour However after several minutes of operation the compressors internal protector will trip If opposite rotation is needed disconnect and reverse any two leads of the three phas...

Страница 31: ...cessor control will energize the blower motor Once the room t stat has been satisfied it will de energize Y1 If the compressor has satisfied its minimum run time the compressor and fan de energize Otherwise the unit operates the cooling system until the minimum run time for the compressor has been completed After the compressor de energizes the blower is stopped following the elapse of the fan off...

Страница 32: ...densate Overflow lock out SAFETY CONTROLS The microprocessor control monitors the following inputs 1 A High Pressure Switch on each compressor circuit to protect against excessive discharge pressures 2 A Low Pressure Switch on each compressor circuit to protect against loss of refrigerant charge 3 A Condensate Overflow Switch to protect against condensate overflow Compressor Protection In addition...

Страница 33: ... the button once and it scans the bus then assigns itself the first available address starts at 2 It then flashes that address one time Pressing the button twice causes the control to flash the address FLASH CODES Description On Steady This is Control Failure 2 Flashes Control waiting ASCD Anti Short Cycle Delay 3 Flashes High Pressure Compressor 1 Lockout 4 Flashes High Pressure Compressor 2 Lock...

Страница 34: ... type and do not require lubrication Check bearings for any signs of wear movement between inner and outer races Ensure bearing locking collars are secure to the shaft and that collar locking screw is properly set Check that the blower wheel is tight on the shaft and that the hub set screws are tightened to the proper torque DRIVE BELTS Examine belts periodically for wear Glazed areas on the drive...

Страница 35: ...t least 700 psig high side and 180 psig low side with 550 psig retard All hoses must have a service pressure rating of 800 psig Leak detectors must be designed to detect HFC refrigerants Systems must be charged with refrigerant Use a commercial type metering device in the manifold hose R 410A can only be used with POE type oils POE type oils rapidly absorb moisture from the atmosphere Vacuum pumps...

Страница 36: ... USA 17406 8469 800 861 1001 Subject to change without notice Printed in USA Copyright by Johnson Controls 2018 www johnsoncontrols com ALL RIGHTS RESERVED Form 145 32 IOM4 818 Issue Date August 30 2018 Supersedes 145 32 IOM4 1216 ...

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