Unitary products group CPH 060 Installation instructions

Model CPH Horizontal
Water-Cooled
Air Conditioning Unit
Supersedes: 145.14-IOM1 (708) Form 145.14-IOM1 (908)
MODEL CPH 060, 096, 120
HORIZONTAL WATER-COOLED
AIR CONDITIONING UNITS
INSTALLATION & OPERATION
INSTRUCTIONS

JOHNSON CONTROLS
2
FORM 145.14-IOM1 (908)
This equipment is a relatively complicated apparatus.
During installation, operation, maintenance or service,
individuals may be exposed to certain components or
conditions including, but not limited to: refrigerants, oils,
materials under pressure, rotating components, and
both high and low voltage. Each of these items has the
potential, if misused or handled improperly, to cause
bodily injury or death. It is the obligation and respon-
sibility of operating/service personnel to identify and
recognize these inherent hazards, protect themselves,
and proceed safely in completing their tasks. Failure to
comply with any of these requirements could result in
serious damage to the equipment and the property in
IMPORTANT!
READ BEFORE PROCEEDING!
GENERAL SAFETY GUIDELINES
which it is situated, as well as severe personal injury or
death to themselves and people at the site.
This document is intended for use by owner-authorized
operating/service personnel. It is expected that this
individual possesses independent training that will en-
able them to perform their assigned tasks properly and
safely. 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 of potential hazard:
All wiring must be in accordance with published specications and must be performed ONLY
by qualied service personnel. Johnson Controls will not be responsible for damages/problems
resulting from improper connections to the controls or application of improper control signals.
Failure to follow this will void the manufacturer’s warranty and cause serious damage to prop-
erty or injury to persons.
DANGER indicates an imminently haz-
ardous situation which, if not avoided,
will result in death or serious injury.
CAUTION identies a hazard which could
lead to damage to the machine, damage
to other equipment and/or environmental
pollution. Usually an instruction will
be given, together with a brief expla-
nation.
WARNING indicates a potentially haz-
ardous situation which, if not avoided,
could result in death or serious injury.
NOTE is used to highlight additional in-
formation which may be helpful to you.

FORM 145.14-IOM1 (908)
3
JOHNSON CONTROLS
CHANGEABILITY OF THIS DOCUMENT
In complying with Johnson Controls policy for continu-
ous product improvement, the information contained
in this document is subject to change without notice.
While Johnson Controls makes no commitment to up-
date or provide current information automatically to the
manual owner, that information, if applicable, can be
obtained by contacting the nearest Johnson Controls
service ofce.
It is the responsibility of operating/service personnel as
to the applicability of these documents to the equipment
in question. If there is any question in the mind of oper-
ating/service personnel as to the applicability of these
documents, then, prior to working on the equipment, they
should verify with the owner whether the equipment has
been modied and if current literature is available.
Work on this equipment should only be done by properly trained personnel who are qualied to
work on this type of equipment. Failure to comply with this requirement could expose the worker,
the equipment and the building and its inhabitants to the risk of injury or property damage.
The instructions are written assuming the individual who will perform this work is a fully trained
HVAC & R journeyman or equivalent, certied in refrigerant handling and recovery techniques, and
knowledgeable with regard to electrical lock out/tag out procedures. The individual performing
this work should be aware of and comply with all national, state and local safety and environ-
mental regulations while carrying out this work. Before attempting to work on any equipment,
the individual should be thoroughly familiar with the equipment by reading and understanding
the associated service literature applicable to the equipment. If you do not have this literature,
you may obtain it by contacting a Johnson Controls Service Ofce.
Should there be any question concerning any aspect of the tasks outlined in this instruction,
please consult a Johnson Controls Service Ofce prior to attempting the work. Please be aware
that this information may be time sensitive and that Johnson Controls reserves the right to revise
this information at any time. Be certain you are working with the latest information.

JOHNSON CONTROLS
4
FORM 145.14-IOM1 (908)
TABLE OF CONTENTSTABLE OF CONTENTS
General Information 6
Installation 7
Inspection of Equipment 8
Site Selection 8
General Data 9
Dimensional Data 10
Water Piping 12
Water Pressure Drop 13
Supply/Return Air Ductwork 14
Electrical 14
Wiring 15
Fan Performance Data 15
Motor and Drive Data 16
RPM Adjustment 16
Start-Up & Operation 17
Refrigerant Charges 17
Safety Switch Settings 17
Typical Schematic 18
Maintenance / Service 19
Filter Sizes 19

FORM 145.14-IOM1 (908)
5
JOHNSON CONTROLS
UNIT NOMENCLATURE
CP H 180 A 2 E 1 A A A 0 A - A
Product Category
CP= Water-Cooled Package R-22 CS= Water-Cooled Package R410A Future
Product Identier
V= Vertical Arrangement H= Horizontal Arrangement
Nominal Capacity
060 = 5 Ton 096 = 8 Ton 120 = 10 Ton 144 = 12 Ton
180 = 15 Ton 240 = 20 Ton 300 = 25 Ton
Design Series
A= Current B= Future C= Future
Voltage
1= 208/230-60-3 2= 208/230-60-3 4= 460-60-3 5= 575-60-3 6= 265-60-1 8= 380-415/3/60
Control Options
E= Std. Electro-Mechanical Controls K= Remote Management Relay Kit M= LCCS Control System F= Future Options
ID Motor
1= Standard Air-Side Coil 2= High Static 3= High Efciency 4= High Static & Efciency 5= TEFC
Indoor Air-side Options
A= Std. Water Coil c= Corrosion Protective Coating D= Stainless Steel Drain Pan F= Coated Coil w/ SS Drain Pan
Water-side Options
A= Std. Water Coil B= Hot Gas Bypass E= Future Options
Refrigerant Circuit Options
A= None B= Hot Gas Bypass E= Future Options
Service Digit
A= None Future
Heating Options
0= None Future
Miscellaneous Options
0= None D= Condensate Overow

JOHNSON CONTROLS
6
FORM 145.14-IOM1 (908)
GENERAL INFORMATION
Our units are designed to accommodate the ever-
changing installation requirements of today’s market.
All models 5 - 10 tons are shipped as factory-charged
unitized packages. Low prole design allows the unit to
be installed on the oor or suspended from the ceiling.
CPH models feature a ‘straight-through’ airow congu-
ration. Units are completely factory wired and piped.
These units are designed to allow easy passage through
doors, hallways and elevators. All unit components are
securely mounted inside the heavy gauge “Galvalume”
steel cabinet. All units are lined with 1/2” thick - 2 lb
density acoustical insulation to ensure the quietest op-
eration. All models are provided with medium- efciency
2” thick throwaway lters.
The 5 ton model has a single refrigerant circuit. The 8
and 10 ton models are dual compressor units with two in-
dependent compressor/ condenser circuits. Evaporator
coils are of copper tube and rippled aluminum plate n
construction. The high-efciency tube-in-tube condens-
ers feature a convoluted inner tube design for optimum
performance. Standard models feature a copper inner
tube surrounded by a steel outer tube, and carry a 400
psig working pressure rating. Multiple refrigerant circuit
models feature internally manifolded condensers (single
water in, water out connection).
High efciency Scroll compressors are used in all mod-
els, mounted on durable rubber isolators to reduce vibra-
tion and noise while operating. Each refrigerant circuit is
equipped with high pressure and low pressure switches.
All models are equipped with an adjustable thermal ex-
pansion valve (with external equalizer), one valve per
circuit. Each refrigerant circuit is also equipped with a
liquid line lter drier, sight glass/moisture indicator, and
service access ports. An electrically re-setable lock-out
relay will shut off the compressor in the event of pressure
switch trip during operation. Control circuit operates on
24V, and features an oversized transformer. Optional
anti-short circuit timers can be eld/factory installed.
Installation time is minimized with all models. When plan-
ning an installation consider power supply, thermostat,
condensate drain line, duct run, and service clearances.
A remote thermostat device is eld supplied and installed
to control the unit operation.
Service access doors are equipped with lifting handles,
and are located on both sides of the unit to allow easy
servicing of all components.
All units are equipped with centrifugal blowers combined
with variable pitch adjustable pulleys. Forward curved
double width, double inlet blowers are used for evapo-
rator air movement. All models employ a draw-through
air ow arrangement. Large evaporator coil face areas
reduce noise levels, air pressure drops, and minimize
potential condensate blow-off. All blower wheels are
galvanized steel, with solid steel shafts supported in
permanently lubricated ball bearings. V-belts drive all
models and blower RPM can be adjusted through the
motor sheave.

FORM 145.14-IOM1 (908)
7
JOHNSON CONTROLS
TYPICAL INSTALLATION LAYOUT (CPH060 SHOWN)
LD13464

JOHNSON CONTROLS
8
FORM 145.14-IOM1 (908)
PRE-INSTALLATION INSPECTION OF EQUIPMENT
All units are factory tested to ensure safe operation
and quality assembly. Units are packaged and sealed
on shipping skids and shipped in rst class condition.
Torn and broken packaging, scratched or dented pan-
els should be reported to carrier immediately. Internal
inspection of all units should be performed prior to
installation . Remove all access doors and check for
visual defects that can occur during transport. Any prob-
lems found internally should be reported to carrier and
manufacturer immediately. Refrigerant circuit should be
checked to ensure no leaks have occurred during ship-
ment. Install gauge set to high and low pressure ports
to conrm 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 handling
damages are not warranty items.
RIGGING
PRIOR TO MOUNTING UNIT, CHECK
INDIVIDUAL UNIT WEIGHTS AND VER-
IFY LIFTING CAPACITY OF LIFTING
EQUIPMENT EXCEEDS WEIGHT OF
UNITS BY SAFE MARGINS. FAILURE TO
DO SO MAY RESULT IN UNIT DAMAGE,
PERSONAL INJURY OR EVEN DEATH.
DETERMINE THE ACTUAL CENTER OF
GRAVITY OF THE UNIT BY PERFORM-
ING A TEST LIFT. LIFTING AN UNBAL-
ANCED UNIT CAN CAUSE PERSONAL
INJURY OR EVEN DEATH.
INSTALLATION
LOCK ALL ELECTRICAL POWER SUP-
PLY SWITCHES IN THE OFF POSITION
BEFORE INSTALLING THE UNIT. FAIL-
URE TO DISCONNECT POWER SUPPLY
MAY RESULT IN ELECTRICAL SHOCK
OR EVEN DEATH.
Location - To ensure unit operates at maximum efcien-
cies, choose a dry indoor area where the temperature
is controlled between 50ºF and 15ºF. Consideration
of surrounding areas should be taken when choosing
a location to install the unit. Common vibration and
sound levels associated with commercial equipment
may be objectionable to people or equipment. Install
thermostats, air supplies and returns so that each unit
will operate only on individual unit control.
UNIT MOUNTING
The 5 through 10 ton models are shipped as a fully
assembled integral package. Units are not intended for
outdoor installation.
Units may be either hung, or oor mounted. If unit is to be
hung, use all mounting points indicated. The use of 1/2
in. diameter hanger rods is recommended. Ensure the
attachment points of the rods to the building structure are
sufcient to support the unit weight. In order to ensure
efcient condensate drainage, the unit may be pitched
towards the condensate drain outlet end of the unit. A
minimum of 4 in. clearance is required under the unit to
allow for trapping of the evaporator condensate drain.
Floor mounted units should be secured on a solid, level
pad. The use of isolating vibro-pads at several points
under the bottom mounting channels is recommended.
Ensure that provision is made for clearance to install a
trap on the condensate drain outlet.

FORM 145.14-IOM1 (908)
9
JOHNSON CONTROLS
The water cooled coaxial condensers in these units have copper tubing and are NOT suitable for salt or brackish water.
Do not install these units outdoors, or in any area where the surrounding temperature may drop below 32ºF.
GENERAL DATA
Model 060A 096A 120A
Nominal Cooling(Ton) 5 8 10
Cooling Performance
Gross Cooling Capacity(Btuh) 64100 101800 126000
Design CFM 2000 3200 4000
Compressor-Type Scroll
Number Used 122
Evaporator Coil-Type Copper Tubes, Aluminum Fins
Face Area(sq ft) 5.28 9.17 9.17
Rows/FPI 3/13 3/13 3/13
Condenser-Type Coaxial
Number Used/Tons Capacity 1/5 2/4 2/5
Nominal Water flow rate (gpm) 15 24 30
Condenser Water Connections 1" FPT 1-1/4" FPT 1-1/4" FPT
Evaporator Fan-Type Centrifugal, Forward Curved
Number Used 122
Diameter x Width (in) 10x10 10x8 10x8
Drive Adjustable Belt
Motor HP (Standard/Oversize) 1/NA 1.5/2 2/3
Filters
Number Used-Size(in) 2-20x20x2
2-20x25x2
1-20x20x2
2-20x25x2
1-20x20x2
Condensate Drain Connection 3/4FPT
Weight 460 710 760
NOTE: Cooling performance is rated at 80°F dry bulb 67°F wet bulb entering air temperature,
CFM listed, 85°F entering 95°F leaving water temperature, and water flow rate listed.
Gross capacity does not include the effect of evaporator fan motor heat.

JOHNSON CONTROLS
10
FORM 145.14-IOM1 (908)
060
LD13465

FORM 145.14-IOM1 (908)
11
JOHNSON CONTROLS
096 & 120
LD13466

JOHNSON CONTROLS
12
FORM 145.14-IOM1 (908)
WATER PIPING
All factory installed water piping terminates inside the
unit. Multi-condenser units feature manifolded single
water in and out connections.
Water connection ttings are threaded copper. Use
caution when tightening steel pipe into copper
ttings. Always use a backing wrench on the hex
ttings inside the unit.
It is recommended that exible connectors be provided
on the water supply and return lines if noise and vibra-
tion transmission could be a problem.
Water piping should include shutoff / balancing valves so
that the unit can be serviced without shutting down and
draining the entire water supply circuit. Since units are
piped in parallel piping circuits, the shutoff valves may
be used to equalize the pressure drop to each branch
for even condenser water distribution. A bibcock or a
plugged tee tting should be installed between the shut-
off valves and the unit in both the inlet and outlet pipes.
These connections are to provide for acid cleaning of
the condenser, if this should become necessary.
CONDENSER PRESSURE CONTROL
Water regulating valves provide control of the quantity of
condenser water supplied to the unit by sensing the con-
densing temperature. The factory installed Condenser
Pressure Control option provides a regulating valve for
each internal condenser water circuit.
The water regulating valve needs to be adjusted to
maintain a leaving water temperature between 90ºF and
100ºF. If using a refrigerant discharge pressure gauge,
adjust the water valve to maintain a condensing pressure
of 170 to 220 PSIG. The valve is adjusted by turning
the ¼ inch square shaft on top of the spring housing.
Turning the adjusting screw counter clockwise will raise
the opening pressure and raise the condensing pressure
being maintained. Turning the adjusting screw clockwise
will lower the opening point and lower the condensing
pressure being maintained. If mains water is being used,
make sure the valve closes soon after the compressor
stops. If the ow does not stop after a few minutes,
raise the opening pressure by turning the adjusting shaft
counter clockwise until the ow stops.
If the unit is running on mains water, we recommend
adjusting the water regulating valve to give 100ºF leav-
ing water temperature or 220 PSIG condensing tem-
perature. This will give the best compromise between
low water ow and high operating efciency. If the
condenser water is being re-circulated through a cooling
tower or a chilled water system, it is recommended that
the water regulating valve to set for a lower condensing
temperature. This will provide higher efciency, lower
operating cost and a lower sound level. The minimum
condensing pressure required for satisfactory expan-
sion valve operation is 170 PSIG. This corresponds to
a leaving water temperature of 90ºF.

FORM 145.14-IOM1 (908)
13
JOHNSON CONTROLS
WATERSIDE PRESSURE DROP
(STANDARD UNIT-MANIFOLDED CONDENSERS)
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
6810 12 14 16 18 20 22 24 26 28 30 32 34
UNIT FLOW RATE (GPM)
PRESSURE DROP (FT H20)
060 096 120

JOHNSON CONTROLS
14
FORM 145.14-IOM1 (908)
DUCTWORK
When installing ductwork, adhere to local Codes and
sensible practice. Minimize duct runs and avoid abrupt
changes in direction where possible.Allow ample access
space for servicing of the coils and changing of lters.
Perform regular maintenance on ducts to increase unit
life, maintain efcient operation, and reduce accumu-
lation of explosive dust. Refer to blower performance
charts, and engineer duct runs and accessory pres-
sure drop so as not to exceed maximum external static
values.
Canvas or other types of exible collars are recom-
mended for connecting the air ducts to the unit. The
supply air duct collar can be connected directly to the
blower outlet anges. Return air may be ducted to the
unit, or drawn directly from the return air space. If a
ducted return is desired, duct connection anges may
be secured directly to the lter frame anges. The lter
frame on 5, 8 and 10 ton models has duct attachment
anges incorporated into the lter rack.
ELECTRICAL WIRING
Follow local electrical codes when making electrical con-
nections. Units are completely factory wired for normal
supply voltages (ie.208-230, 460, 575/3phase/60hz)
Conrm unit specications by checking unit data plate.
All electrical components are accessible through an
independent electrical panel located on the right hand
side of the unit (condenser/compressor section). The
electrical control boxes are located behind outer ac-
cess panels. The compressor section electrical cover
is provided with wiring diagrams on the inside, which
must be opened to be read.
Provide individual power disconnects for each unit.
Install a secure ground to the bonding lug located in
the electrical control panel. If canvas exible joints are
used on ductwork, install a ground wire to the ductwork
as well.
DISCONNECT AND LOCK OUT POWER
WHEN SERVICING UNIT. UNIT MAY
START AUTOMATICALLY IF POWER
IS NOT DISCONNECTED. FAILURE TO
DO SO MAY RESULT IN PERSONAL IN-
JURY OR DEATH DUE TO ELECTRICAL
SHOCK.
All wiring must comply with applicable
local and national codes (NEC). Type and
location of disconnect switches must
comply with all applicable codes.
Unit requires installer to provide a 24volt thermostat
with appropriate heating and cooling stages as needed.
For low voltage wiring, 18 gauge wire may be used for
up to 50 feet lengths. Low voltage runs up to 125 feet
require 16 gauge wire.
All models are designed for single zone cooling applica-
tions, utilizing space or return air thermostatic controls.
A low voltage terminal block is provided for hook-up of
conventional or programmable thermostats.

FORM 145.14-IOM1 (908)
15
JOHNSON CONTROLS
MODEL VOLTAGE COMPRESSOR EVAPORATOR MIN. CCT. MAX FUSE /
#QTY RLA LRA HP FLA RPM AMPACITY CCT. BKR. AMP
060A 208-230/3/60 1 @ 19.3 123.0 1.00 3.1 1800 27.23 45
460/3/60 1 @ 7.5 49.5 1.00 1.6 1800 10.98 15
575/3/60 1 @ 6.4 40.0 1.00 1.3 1800 9.30 15
096A 208-230/3/60 2 @ 13.9 88.0 1.50 4.4 1800 35.68 45
460/3/60 2 @ 7.1 44.0 1.50 2.2 1800 18.18 25
575/3/60 2 @ 5.4 34.0 1.50 1.8 1800 13.95 15
120A 208-230/3/60 2 @ 19.3 123.0 2.00 6.0 1800 49.43 60
460/3/60 2 @ 7.5 49.5 2.00 3.0 1800 19.88 25
575/3/60 2 @ 6.4 40.0 2.00 2.4 1800 16.80 20
OVERSIZE EVAPORATOR MOTORS
MODEL VOLTAGE COMPRESSOR EVAPORATOR MIN. CCT. MAX FUSE /
#QTY RLA LRA HP FLA RPM AMPACITY CCT. BKR. AMP
096A 208-230/3/60 2 @ 13.9 88.0 2.00 6.0 1800 37.28 50
460/3/60 2 @ 7.1 44.0 2.00 3.0 1800 18.98 25
575/3/60 2 @ 5.4 34.0 2.00 2.4 1800 14.55 15
120A 208-230/3/60 2 @ 19.3 123.0 3.00 8.4 1800 51.83 70
460/3/60 2 @ 7.5 49.5 3.00 4.2 1800 21.08 25
575/3/60 2 @ 6.4 40.0 3.00 3.4 1800 17.80 20
SUPPLY AIR BLOWER PERFORMANCE
EXTERNAL STATIC 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
1800 846 0.41 936 0.48 1024 0.56 1107 0.64 1195 0.74 1259 0.82 1325 0.90 1400 0.99 - -
060A 2000 917 0.54 999 0.62 1079 0.71 1157 0.79 1233 0.89 1305 0.98 ------
2200 994 0.70 1069 0.79 1142 0.88 1214 0.98 ----------
3000 810 0.65 900 0.78 986 0.91 1066 1.04 1143 1.17 1221 1.32 1294 1.48 1363 1.63 1433 1.79
096A 3200 851 0.78 938 0.91 1018 1.04 1095 1.18 1170 1.32 1236 1.42 1305 1.56 1380 1.74 1447 1.90
3400 892 0.91 974 1.05 1051 1.19 1125 1.33 1196 1.48 1266 1.64 1320 1.81 1390 1.90 - -
3600 927 1.05 1006 1.20 1081 1.34 1152 1.50 1220 1.65 1287 1.81 1353 1.98 1405 2.07 1472 2.17
120A 4000 1012 1.40 1085 1.56 1153 1.73 1220 1.89 1283 2.06 1345 2.23 1405 2.41 1464 2.59 1522 2.78
4400 1100 1.83 1166 2.00 1230 2.18 1292 2.37 1351 2.55 1410 2.74 1466 2.92 ----
NOTE:
1. At higher evaporator airflows, and wet bulb conditions condensate carry-over may occur. Adjust airflow downward as necessary.
2. Values include pressure drop from wet coil and clean filters.
3. Shaded areas indicate oversize motors
NOTES: Data shown for packaged unit installation, with single point power supply.
Min. Circuit Ampacity (MCA) = 1.25 x Largest single motor Amps (FLA or RLA) + sum of the remaining motor Amps
Max Fuse/Cct. Bkr Size (MFS) = 2.25 x Largest motor Amps + sum of the remaining motor amps
Select next smallest NEC listed fuse from calculated value
STANDARD EVAPORATOR MOTORS

JOHNSON CONTROLS
16
FORM 145.14-IOM1 (908)
MOTOR AND PULLEY DATA
STANDARD BLOWER MOTOR AND DRIVE DATA
Model
Drive Range
(RPM)
Motor
Adjustable
Motor Pulley
Fixed
Blower Pulley
Belts
HP
Frame
Size
RPM Eff.
(%)
Pitch Dia.
(in)
Pitch Dia.
(in) Designation Qty
60 946-1419 1143 1800 82.5 1.9-2.9 3.5 4L-400 1
96 968-1340 1-1/2 145 1800 84.0 2.4-3.4 4.5 4L-440 1
120 1010-1346 2145 1800 84.0 2.8-3.8 5.0 A43 1
OVERSIZE BLOWER MOTOR AND DRIVE DATA
Model
Drive Range
(RPM)
Motor
Adjustable
Motor Pulley
Fixed
Blower Pulley
Belts
HP
Frame
Size
RPM Eff.
(%)
Pitch Dia.
(in)
Pitch Dia.
(in) Designation Qty
96 1117-1489 2145 1800 84.0 2.8-3.8 4.5 A42 1
120 1212-1548 3145 1800 86.5 3.4-4.4 5.0 A45 1
BLOWER SPEED ADJUSTMENT
The RPM of the supply air and condenser air blowers will depend on the required CFM, and the static resistances
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 by moving motor towards the blower shaft via the adjustable mounting.
2) Loosen the setscrew in the adjustable motor pulley ange. Remove external key on pulleys 4 in. dia and
larger.
3) Slower speed will increase when moveable ange is adjusted towards the xed ange (closed). Blower speed
will decrease when the moveable ange is adjusted away from the xed ange (opened). Pulleys are adjust-
able only in half-turn increments. Do not open pulley more than ve full turns for “4L” and “A” belts, or six full
turns for “B” belts.
4) Once the pulley has been opened/closed the appropriate number of turns, replace the external key and tighten
the adjustment setscrew. Proper torque is 110-130 in.-lbs.
5) Install drive belt and adjust motor mount to tension belt.

FORM 145.14-IOM1 (908)
17
JOHNSON CONTROLS
START-UP AND OPERATION
Prior to starting unit for the rst time,
turn the thermostat system switch to
OFF - or raise the cooling setpoint to the
highest temperature to prevent the unit
from starting, then close the electrical
disconnect switch.
Start unit and check rotation of fans and compressors.
Scroll compressors will only compress in one rotational
direction. Three phase compressors will rotate in either
direction depending upon phasing of the power. Since
there is a 50-50 chance of connecting power in such a
way as to cause rotation in the reverse direction, it is
important to ensure proper rotation direction is achieved
when the system is installed and operated.
Verication of proper direction is made by observing
that suction pressure drops and discharge pressure
rises when the compressor is energized. Reverse rota-
tion also results in an elevated sound level as well as
substantially reduced current draw.
There is no negative impact on durability caused by
operating three phase Scroll compressors in the re-
versed 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 phase supply. Reconnect
power and observe for correct rotation.
Observe unit operation and check for unusual noise or
vibration.
Ref. Charge 5 TON 8 TON 10 TON
No. of Circuits 122
Per Circuit (lb) 4.625 4.188 5.125
High Low
Cut Out (PSIG) 400 25
Cut In (PSIG) 275 60
PRESSURE SWITCH SETTINGS - ALL MODELS

JOHNSON CONTROLS
18
FORM 145.14-IOM1 (908)
TYPICAL SCHEMATIC

FORM 145.14-IOM1 (908)
19
JOHNSON CONTROLS
MAINTENANCE / SERVICE
DISCONNECT AND LOCK OUT POWER
WHEN SERVICING UNIT. FAILURE TO
DO SO MAY RESULT IN PERSONAL IN-
JURY OR DEATH DUE TO ELECTRICAL
SHOCK.
Exercise care when working around
the sharp metal edges of door panels
or door frames, etc. These edges can
cause injury.
FILTERS -
Inspect lters monthly and replace as necessary. Use UL
Class 2 rated lters. Factory supplied lters are medium
efciency, extended surface pleated type. Replacements
should be of the same type, to maintain optimum airow
performance.
EVAPORATOR AND CONDENSER COILS -
Inspect the evaporator coil at lter change intervals.
Inspect the condenser coil at least semi-annually. A
dirty condenser coil will result in elevated condensing
pressures and poor unit performance. Dirty or clogged
evaporator coils causes low suction pressure and lost
capacity. If the coils appear dirty, clean them using mild
detergent or a commercial coil cleaning agent.
BLOWERS -
Inspect both the evaporator and condenser blowers at
each regular service interval. Clean blower wheels as
needed. Bearings are permanently sealed ball 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 prop-
erly set. Check that the blower wheel is tight on the shaft,
and that the hub set screws are properly torqued.
DRIVE BELTS –
Examine belts periodically for wear. Glazed areas on the
drive surfaces indicate overheating due to belt slippage.
Ideal tension is the lowest tension at which the belt will
not slip under peak load conditions. Over-tensioning
shortens belt and bearing life.
The tension on the belt should be adjusted for a deec-
tion of 1/64 of an inch per inch of belt span, with the ap-
propriate force applied at the midpoint of the span. Ten-
sion “New” belts at the maximum value indicated. Used
belts should be maintained at the minimum value.
REFRIGERANT CIRCUIT(S)
With the unit operating, check and record the compressor discharge and suction pressures. The compressor running
current should also be recorded. A maintenance log of these readings can indicate if the unit is operating within it’s
normal limits. Abnormal readings should be investigated, and the Cause corrected.

JOHNSON CONTROLS
20
FORM 145.14-IOM1 (908)
NOTES