background image

JOHNSON CONTROLS

4

FORM 145.32-IOM1 (908)

GENERAL INFORMATION 

Our  units  are  designed  to  meet  the  ever-changing 

(unique) installation requirements of today’s market. The 

horizontal configuration is unitized for single package 

or split installation. Low profile design allows the unit to 

be installed on the floor or suspended from the ceiling. 

All unit components are securely mounted inside the 

heavy gauge “Galvalume” sheet metal cabinet. All units 

are lined with a 1/2 in. thick – 21lb density acoustical 

insulation to ensure the quietest operation. All models 

are shipped with medium-efficiency 2-in. thick throw

-

away filters. Multi-position filter rack is external to the 

cabinet. 

Unit can be turned on its side for short periods of time, 

which  allows  passage  through  standard  door  sizes. 

Removal of the cross supports on the top and sides will 

convert packaged unit into a split system, allowing the 

condensing  section to be installed remotely from the 

evaporator section. 

Horizontal units 2, 3, 4 & 5 ton models have a single 

refrigerant circuit configuration. All models are equipped 

with an adjustable thermal expansion valve (with exter-

nal equalizer), one valve per circuit. Each refrigerant 

circuit is also equipped with a liquid line filter drier, sight 

glass/moisture indicator and easy access service gauge 

ports. All 2-5 ton models are shipped as factory-charged 

unitized packages. The 2-5 ton units include refrigerant 

line shut-off valves to allow the units to be field split. 

Installation time is minimized with all models. When plan-

ning an installation consider power supply, thermostat, 

condensate drain line, duct run, servicing allowances, 

and load points. A remote thermostat control device is 

field supplied and installed to control the units operation. 

Each refrigerant circuit is equipped with auto-reset high 

pressure and low pressure switches. Each circuit is con-

stantly monitored by ComfortAlert module. By monitoring 

and analyzing data from the Copeland Scroll compressor 

and the thermostat demand, the module can accurately 

detect the cause of electrical and system related failures 

and protect the compressor.  A flashing LED indicator 

communicates the ALERT code and guides the service 

technician more quickly and accurately to the root cause 

of a problem. Control circuit is 24-volt operation with 

oversized transformer. Optional anti-short circuit timers 

can be field/factory installed. 

Service access doors are equipped with handles and 

are located on all sides of the unit to allow easy servic-

ing of all components. Service access doors are factory 

shipped  with  knock-outs  allowing  gauge  lines  to  be 

installed and pressure readings to be taken while the 

machine is operating. In addition there is a removable 

panel on the access door so visual observation of the 

sight glass is possible without removing the access door. 

All units are equipped with centrifugal blowers combined 

with variable pitch adjustable pulleys. Forward curved 

double width and inlet centrifugal blowers are used for 

condenser & evaporator air movement. All models em-

ploy a draw-through air flow system. All blower wheels 

are  galvanized  steel,  with  solid  steel  shafts  and  are 

equipped with permanently lubricated ball bearings. V-

belt driven blowers are used in all models; RPM can be 

adjusted through the variable pitch motor sheave. 

ONLY QUALIFIED PERSONNEL SHOULD 

PERFORM  INSTALLATION AND  SER-

VICE OF THIS EQUIPMENT. 

High efficiency scroll compressors are used in all mod

-

els, mounted on durable rubber isolator pads reducing 

vibration and noise while operating. Large evaporator 

and condenser coil face areas reduce noise levels, air 

pressure drops and minimize potential for condensate 

blow off. All models are equipped with copper tube and 

rippled aluminum plate fin coils. 

Units will operate reliably at an outdoor ambient down 

to 60 deg F. 

Summary of Contents for DSH

Page 1: ...Model DSH Ceiling Mounted Ducted R 410A Air Conditioning Units New Release Form 145 32 IOM1 908 CEILING MOUNTED DUCTED R 410A AIR CONDITIONING UNITS INSTALLATION INSTRUCTIONS ...

Page 2: ... It is essential that prior to performing any task on this equipment this individual shall have read 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 ...

Page 3: ...bility of these documents then prior to working on the equipment they should verify with the owner whether the equipment has been modified and if current literature is available safety symbols 2 Changeability of this document 3 TABLE OF CONTENTS 3 GENERAL INFORMATION 4 PRE INSTALLATION INSPECTION OF EQUIPMENT 6 RIGGING 6 INSTALLATION 6 UNIT MOUNTING 7 SEPARATION OF UNITS 8 INTERCONNECTING REFRIGER...

Page 4: ...h pressure and low pressure switches Each circuit is con stantly monitored by ComfortAlert module By monitoring and analyzing data from the Copeland Scroll compressor and the thermostat demand the module can accurately detect the cause of electrical and system related failures and protect the compressor A flashing LED indicator communicates the ALERT code and guides the service technician more quic...

Page 5: ...FORM 145 32 IOM1 908 5 Johnson Controls TYPICAL INSTALLATION DRAWING ...

Page 6: ...ilure to do so may result in unit damage per sonal injury or even death To ensure safe installation of the unit when ceiling mount application is specified estimate the approximate center of gravity of the unit The configuration of internal com ponents for each unit is different and weight is unevenly distributed Determine the actual center of gravity of the unit by performing a test lift Lifting ...

Page 7: ...se all mounting points indicated regardless if unit is installed as a package or split system See unit dimension drawings Use of 1 2in dia hanger rods is recommended Ensure the attachment point of the rods to the building structure is sufficient to support the unit weight In order to ensure efficient condensate drain age the unit may be pitched towards the evaporator end of the unit Aminimum of 4 ...

Page 8: ...amage the short lengths of refrigerant tubing extending into the condenser section The separated evaporator and condenser modules may now be individually moved to the proposed installation site for re assembly or separately located for split ap plications INTERCONNECTING REFRIGERANT TUBING SPLIT INSTALLATION After the evaporator and condenser sections have been mounted the interconnecting refriger...

Page 9: ...FORM 145 32 IOM1 908 9 Johnson Controls DIMENSIONAL DATA ...

Page 10: ...JOHNSON CONTROLS 10 FORM 145 32 IOM1 908 DIMENSIONAL DATA Cont ...

Page 11: ...e condenser air discharge for 1 200 1 500 feet minute nominal velocity Maximum recommended 1 700 feet minute The use of louvers with higher velocities than above may be employed at the discretion of the engineer installer provided that the total air pressure drop does not exceed the capability of the condenser fan and motor The use of low restriction louvers with shallow blade angles can allow hig...

Page 12: ... unit Unit may start automati cally if power is not disconnected Fail ure to do so may result in personal injury or death due to electrical shock PACKAGED UNIT If unit is to be installed as a complete integral unit the thermostat low voltage wiring is to be brought through connection A while power wiring will be brought through connection C Make sure you check the unit data plate for full specific...

Page 13: ...IC PRESSURE Inches W C MODEL SUPPLY 0 2 0 4 0 6 0 8 1 0 1 2 1 4 1 6 1 8 CFM RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 700 593 0 06 755 0 10 915 0 13 1048 0 17 1175 0 23 2 TON 800 629 0 08 777 0 12 914 0 16 1169 0 20 1178 0 25 900 668 0 11 804 0 15 930 0 19 1170 0 24 1000 598 0 11 722 0 16 835 0 19 930 0 25 1141 0 32 3 TON 1200 727 0 20 831 0 25 929 0 31 972 0 33 1400 ...

Page 14: ...Pulley Fixed Blower Pulley BLOWER SPEED ADJUSTMENT The RPM of the supply air and condenser air blow ers will depend on the required CFM and the static resistance of both the supply discharge and the return intake duct systems With this information the RPM for the blowers can be determined from the blower performance tables Adjustment of blower speed is accomplished as follows 1 Loosen belt tension...

Page 15: ...ompressors in the re versed direction for a short period of time less than one hour However after several minutes of operation the compressors internal protector will trip Ref Charge 2 TON 3 TON 4 TON 5 TON No of Circuits 1 1 1 1 Per Circuit lb 7 625 8 125 11 188 10 938 ALL MODELS High Low Cut Out PSIG 600 55 Cut In PSIG 450 75 If opposite rotation is needed disconnect and reverse any two leads of...

Page 16: ...JOHNSON CONTROLS 16 FORM 145 32 IOM1 908 TYPICAL SCHEMATIC ...

Page 17: ...k and record the compres sor discharge and suction pressures The compressor running current should also be recorded Amaintenance log of these readings can indicate if the unit is operating within its normal limits Abnormal readings should be investigated and the cause corrected B POUNDS FORCE Belt Cross Section Min Max 4L 1 1 2 2 1 2 A 3 1 2 6 1 2 B 5 1 2 8 BX 8 11 FILTERS 2 TON 3 TON QTY SIZE 2 2...

Page 18: ...s the Flash Code correlates to a particular abnormal condition Detailed descriptions of specific ALERT Flash Codes are shown in two tables attached to this manual TRIP LED Red indicates there is a demand signal from the thermostat but no current to the compressor is detected by the module The TRIP LED typically indi cates the compressor protector is open or may indicate missing supply power to the...

Page 19: ...harge b Evaporator blower is not running c Evaporator coil is frozen d Faulty metering device e Condenser coil is dirty f Liquid line restriction lter drier blocked if present 2 If high pressure switch is open go to Flash Code 2 information 3 Intermittent thermostat demand signal 4 System or control board defective Yellow ALERT Flash Code 3 Short Cycling Compressor is running only brie y LOCKOUT R...

Page 20: ...pressor bearings are seized 1 Condensing unit power disconnect is open 2 Compressor circuit breaker or fuses are open 3 Compressor contactor has failed open 4 High pressure switch is open and requires manual reset 5 Broken supply wires or connector is not making contact 6 Unusually long compressor protector reset time due to extreme ambient temperature 7 Compressor windings are damaged 1 Compresso...

Page 21: ...ation of Comfort Alert is correct a functional test can be performed Force a call for cooling and when the compressor starts to run monitor the yellowALERT LED The LED should remain off during test Disconnect power to the compressor while the call for cooling is still active The red TRIP LED will flash indicating the anti short cycle timer is active If the red LED does not function as described ref...

Page 22: ...involved in replacing the compressor is not covered by this Warranty LABOR AND COST NOT COVERED This Warranty provides only replacement parts or credits and does not provide for or cover any labor shipping handling or other costs for service travel servicing removing or installing any parts EXCLUSIONS This Warranty shall be void if 1 The unit is not installed by a licensed or otherwise qualified o...

Page 23: ...ust be at 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 Vacu...

Page 24: ...to change without notice Printed in U S A Copyright 2008 by Unitary Products Group All rights reserved Form 145 32 IOM1 908 New Release York PA 17405 P O Box 1592 York PA 17405 Engineered Systems Products Group ...

Reviews: