Amron 9000-ECS User manual

User Manual
for
Amron International, Inc.
Model 9000-ECS
External Conditioning System
S/N______________________
1380 Aspen Way, Vista California 92081-8349
United States of America
Phone: [phone]
Fax [phone]
Email: [e-mail]
Web: www.amronintl.com
This manual and the information contained herein are provided for use as an operation and maintenance
guide. No license or rights to manufacture, reproduce, or sell either the manual or articles described
herein are given. Amron International, Inc. reserves the right to change specifications without notice.
Copyright© 2018 Amron International, Inc.

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TABLE OF CONTENTS
1. INTRODUCTION AND SPECIFICATIONS ...........................................................................................1
INTRODUCTION............................................................................................................................11.1 ELECTRICAL SPECIFICATIONS...................................................................................................11.2 MODEL 9000-ECS..........................................................................................................................31.3
2. OPTIONS...............................................................................................................................................4
3. CONTROLS AND CONNECTIONS......................................................................................................5
POWER SWITCH...........................................................................................................................53.1 HEAT/COOL SWITCH....................................................................................................................53.2 SUPPLY THERMOMETER ............................................................................................................53.3 RETURNTHERMOMETER............................................................................................................53.4 FLUID LEVEL INDICATOR.............................................................................................................53.5 SUPPLY &RETURN CONNECTIONS...........................................................................................53.6 POWER CONNECTIONS...............................................................................................................53.7 FLUID FILLER COVER...................................................................................................................53.8
4. THEORY OF OPERATION ...................................................................................................................6
GENERAL.......................................................................................................................................64.1 REFRIGERATION..........................................................................................................................64.2 FLUID SYSTEM..............................................................................................................................74.3 ELECTRICAL SYSTEM..................................................................................................................84.4
5. INSTALLATION.....................................................................................................................................9
LOCATION .....................................................................................................................................95.1 ELECTRICAL..................................................................................................................................95.2
6. OPERATION........................................................................................................................................10
7. MAINTENANCE AND TROUBLESHOOTING....................................................................................11
GENERAL.....................................................................................................................................117.1TROUBLESHOOTING..................................................................................................................127.2
8. DRAWINGS.........................................................................................................................................13
MODEL 9000-ECS, SPECIFICATIONS........................................................................................148.1 CHAMBER CONDITIONING CONNECTION DIAGRAM .............................................................158.2 9000-ECS BLOCK DIAGRAM ......................................................................................................168.3 ELECTRICAL SCHEMATIC .........................................................................................................178.4 REMOTE CONTROLWIRING DIAGRAM....................................................................................188.5 PARTS LOCATOR, EXTERIOR...................................................................................................198.6 PARTS LOCATOR, FRONT VIEW ...............................................................................................208.7 PARTS LOCATOR, REAR VIEW..................................................................................................218.8 PARTS LOCATOR, TOP VIEW ....................................................................................................228.9 PARTS LOCATOR, ELECTRICAL CONTROL BOX ....................................................................238.10 PARTS LOCATOR, CIRCULATING PUMP PN AC-5C-MD-230V................................................248.11

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9. PARTS LIST GENERAL .....................................................................................................................25
9000-ECS ENVIRONMENTAL CONDITIONING SYSTEMS........................................................269.1 9000-400 RESERVOIR, SUB-ASSEMBLY ..................................................................................279.2 9000-500 ELECTRICAL, SUB-ASSEMBLY .................................................................................289.3 AC-5C-MD-230V CIRCULATING PUMP, 1/8HP, 230V...............................................................299.4
10. LIMITED WARRANTY AND SERVICE POLICY.............................................................................30

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1. INTRODUCTION AND SPECIFICATIONS
INTRODUCTION1.1
The AMRON INTERNATIONAL Inc. Model 9000-ECS, Environmental Control System is
designed to provide chilled or heated fluid for temperature control of Deck Decompression
Chambers. The Model 9000-ECS is used in conjunction with an internal conditioning (heat
exchanger) located inside the DDC.
The Model 9000-ECS is a self-contained unit, using a sealed R-404A refrigeration unit, fluid
reservoir, circulation pump and heater. The system can supply cooled or heated fluid,
operator selected, to provide heat or cooling for the DDC as required. A small circulation
pump circulates fluid (50% propylene glycol, 50% water) through an internal reservoir, where
the fluid is heated or cooled, and on to the chamber where heat is extracted or added as
desired, via the internal conditioning unit.
The Model 9000-ECS is suitable for use on most all double lock decompression chambers.
This includes units ranging in size from 54 inch through 72 inch diameters. There are certain
conditions where the heat load may exceed the capacity of the unit. These conditions may
occur when the chamber is being pressed to depth, when the chamber is located in direct
sunlight, when the chamber is being operated in a very high or very low ambient
temperature, with a high number of personnel within the chamber, or a combination of these
factors.
Most of these conditions can be overcome by operating procedures. During initial press
down of the chamber the amount of heat added to the chamber (compression of the air) will
cause a rise in the temperature of the chamber. To compensate for this heat load, the
chamber can be pre-cooled. Sun shades or other temporary structures can be erected for
operating conditions outdoors or under extreme conditions.
ELECTRICAL SPECIFICATIONS1.2
Cooling .................................................................................................................4000 BTU/HR
Heating................................................................................................................... 3000 WATT
Voltage ........................................................................................................ 220 VAC 50/60 HZ
Fluid Flow Rate ............................................................................................. 3 G.P.M. @5 PSI
Fluid Media..................................................... 50% Ethylene or Propylene Glycol, 50% Water
Capacity ...................................................................................................... Approx. 7 Gallons
Power Requirements................................................................................. 15 AMP Disconnect
Voltage ................................................................................ 220 VAC, 50/60 Hz, Single Phase
Input/output Connections ............................................................................... 1/2" Female NPT
Location.................................................................................................................Front or Rear

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Temperature Cut-Off Point........................................................................................ Automatic
Cool Set Point ..................................................................................................... Approx. 20oF
Heat Set Point ................................................................................................... Approx. 110oF
Temperature Gauge........................................................................................ Supply & Return
Range.......................................................................................... 0 TO 250oF (-20 TO 120oC)
Accuracy..................................................................................................... +/- 1% of Full Scale
Refrigerant Compressor......................................................................................... Sealed Unit
Refrigerant......................................................................................................... Freon, R-404A
Protection ........................................................................................ Internal Thermal Overload
Locked Rotor Current.................................................................................................. 45 Amps
Nominal Current Draw................................................................................................ 6.4 Amps
Restart Interlock ........................................................................................ Approx. 45 Seconds
Mechanical
Enclosure ........................................................................................ 300 Series Stainless Steel
Size - Width................................................................................................ 27.0 in. (685.8 mm)
Depth.......................................................................................................... 19.5 in. (495.3 mm)
Height..................................................................................................... 30.25 in. (768.35 mm)
Weight ....................................................................................................... 175 Lbs. (79.38 kg)
With Cooling Fluid........................................................................................................ 215 Lbs.

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MODEL 9000-ECS1.3

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2. OPTIONS
Model 9000-RCS Remote control switch, allows remote control of the Model 9000-ECS. The 25 foot
remote control cable connects to the remote control connector on the Model 9000-ECS, and permits
the unit to be turned "ON - HEAT", "OFF", or "ON - COOL".

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3. CONTROLS AND CONNECTIONS
POWER SWITCH3.1
Three-position switch, "ON" turns the power on, "OFF" turns the power off. "Remote Control"
permits the unit to be controlled remotely. Selecting the "ON" or "OFF" positions overrides
the remote control. Turning the unit "ON” turns on the circulating pump.
HEAT/COOL SWITCH3.2
Three-position switch, "Heat" turns on the heater. "OFF" turns off cooling and heat, but
allows the circulating pump to run. "Cool" turns on the refrigeration system.
SUPPLY THERMOMETER3.3
Three-inch dial, dual scale thermometer reads fluid temperature leaving the system.
Temperature range 0oto 250oF, (-20oto 120oC).
RETURN THERMOMETER3.4
Three-inch dial, dual scale thermometer reads fluid temperature returning to the system.
Temperature range 0oto 250oF, (-20oto 120oC).
FLUID LEVEL INDICATOR3.5
Slight glass allows checking the fluid level from the front panel.
SUPPLY & RETURN CONNECTIONS3.6
Sub panel mounted to allow the connections to be moved from the rear to the front of the
unit. Connections are 1/2" FNPT.
POWER CONNECTIONS3.7
Sub panel mounted to allow the connections to be moved from the rear of the unit to the
front. Power cord is supplied with a 20 Amp 220 VAC, Twist-Lock plug, NEMA part number
L6-20P. Mating part number is L6-20R. Power cord is approximately 12 feet long. Power
connection panel also contains the remote control connector, use with P/N 9000-RCS, and
remote control switch assembly.
FLUID FILLER COVER3.8
Remove for access to reservoir fill cap.

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4. THEORY OF OPERATION
GENERAL4.1
The Model 9000-ECS is one part of a system designed to provide temperature and humidity
control of a decompression chamber. The complete system consist of an internal
conditioning system (the Amron Model 9100-ICS2), the external conditioning system (the
Amron Model 9000-ECS), and the associated plumbing.
Temperature control is provided by circulating heated/chilled water through a set of coils
inside the chamber (inside conditioning unit), where a fan blows chamber air across the coils
picking up the heat/chill of the circulating fluid.
The temperature of the chamber can be raised or lowered depending upon the temperature
of the circulating fluid. Circulating hot water will cause heated air to be exhausted from the
internal conditioning system. Cold water will cause the temperature of the air exhausted from
the internal conditioning system to be cooled. Temperature control is accomplished by
turning the internal conditioning system off upon reaching the desired temperature.
Humidity removal is accomplished by circulating cold water through the internal conditioning
system that causes moisture in the air to condense on the coils, lowering the humidity within
the chamber.
The Model 9000-ECS, External Conditioning System, consists of a fluid system
(reservoir/pump) to store and circulate the water, a refrigeration unit to cool the water, a
heater to heat the water, and controls to select the mode of operation.
Internal temperature controllers limit the temperature range of the circulating water to 20oF
(minimum) to 110oF (maximum). Within the capacity of the system, the unit will chill the
water until the system reaches 20oF, upon reaching a reservoir temperature of 20oF the
refrigeration system will shut down. The circulation pump will continue to operate, providing
chilled water. When the temperature of the reservoir raises approximately 5oF, the
refrigeration system will start automatically. The same control system is provided for the heat
cycle with the control point set at 110oF.
Refer to block diagram or schematic (Section 10) while reading this section.
REFRIGERATION4.2
The refrigeration system removes heat from the internal reservoir and exhausts the heat to
the ambient air circulating through the unit. The refrigeration system is a closed circuit R-
404A Freon vapor refrigeration system. The refrigeration system consist of the standard
refrigeration components; compressor, condenser, accumulator, filter/drier, sight glass,
expansion valve, and evaporator.
Freon gas is drawn into the suction side of the compressor at a low pressure, compressed to
a high pressure. The output of the compressor is connected to the condenser. The Freon
gas is cooled in the condenser, by a fan blowing ambient air over the coils of the condenser.

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The resulting temperature drop causes the Freon gas to change from a gaseous state to a
liquid form.
The Freon liquid/gas from the output of the condenser is collected in the accumulator. The
accumulator buffers the pressure pulses from the compressor and provides a collection point
(reservoir) to draw off liquid Freon. The Freon then goes through a filter/drier to remove any
foreign particles, and ensure no particles reach the expansion valve. A sight gauge is
provided on the output of the filter/drier as a visual indication of the status of the system.
If you watch the sight glass during normal operation of the system you will see the Freon
flowing through the system. At normal room temperatures 70oF (21oC) you will see a small
amount of bubbles in the liquid. This is normal, if the operating temperature goes up the
amount of bubbles will increase and if the temperature goes down the amount of bubbles will
decrease to the point where there will be none.
The expansion valve controls the flow of liquid Freon into the evaporator, where the Freon
under a lower pressure expands and changes to a gas. This change from liquid to gas
absorbs heat providing the cooling desired. The expansion valve is controlled by a temp bulb
sensing the temperature on the output of the evaporator. If the temperature is high (or equal
to the temperature of the expansion valve) the valve opens allowing more Freon into the
evaporator. This continues until the temperature at the output of the evaporator drops, and
the valve throttles the flow of Freon.
The Freon circuit achieves a balanced condition when the spring force of the expansion
valve, refrigerant pressure/temperature, and evaporator pressure/temperature results in the
proper flow of Freon achieving the desired cooling. The design of the system determines
proper operation as opposed to adjustments. Expansion valves are adjustable; however, this
is set by the manufacture of the valves and is not a field procedure.
The evaporator is a two-circuit system and uses a Freon distributor to feed the two circuits of
the evaporator coil. The expansion valve, distributor, evaporator coil, and compressor
system are sized to achieve the desired end result. It is not recommended that part
substitutions be made. The Freon vapor returns to the compressor (suction side) completing
the refrigerant cycle.
FLUID SYSTEM4.3
The fluid system might be considered the heart of the system. This is where heat is added
to, or subtracted from the system. The fluid, heated or cooled is then pumped to the
chamber inside conditioning unit. The chamber inside conditioning system consists of a set
of coils, where a fan blows air across the coils producing heat or cooling.
The fluid system consists of a reservoir, pump, temperature meters, and associated
plumbing. The reservoir contains a fluid that is heated or cooled, (depending on the mode
selected), which is then pumped to the chamber heat exchanger where heat is extracted or
added to achieve the desired end result.
Because of the low temperature range of the unit (20o F), it is necessary to extend the
operating range of the fluid by adding antifreeze to the water. Use either ethylene glycol or
propylene glycol, in the ratio of 50% glycol to 50% water. The reservoir holds approximately
7 gallons of fluid; therefore it will be necessary to add approximately 3.5 gallons of glycol.

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The pump draws fluid from the bottom side of the reservoir. The pump output is routed to the
supply thermometer, which indicates the output temperature of the fluid. From the
thermometer the fluid is plumbed to the fluid connection panel. This is the connection for the
chamber supply line. The chamber return line attaches to the other connector on the fluid
connections panel. This is routed to the return thermometer, and back to the top of the
reservoir to complete the cycle.
The fluid connection panel is factory fitted to the rear side of the unit. It is possible to move
this connection to the front of the unit if desired. Remove front and rear side covers from the
unit, and the top cover to gain access to the internal plumbing. Remove blank panel from
front, remove fluid connection panel from rear and route hoses to front side of unit and install
fluid connection panel. Install blank panel on rear, install covers to complete the change.
The reservoir also contains the heater, temperature bulbs, and sight glass. The heater is an
immersion type, 220 VAC 3000 watt. Only heat or cool can be selected and operated at one
time, not both.
ELECTRICAL SYSTEM4.4
The electrical system operates from 220 VAC, single phase, 50/60 Hz. The unit requires a
15 amp fused circuit, preferably from a separate disconnect box located close to the system.
The heater and pump have separate internal fuses. The heater is fused at 15 amp, and the
pump at 5 amps.
The unit is controlled by internal contactors for the switching of AC power. This also provides
the facility to control the unit remotely. The power for the contactors is supplied via a small
internal step down transformer that provides 24 VAC. There are three contactors; one for the
refrigeration system, one for the heater and one for the pump. Control is via a front panel
toggle switch that turns the unit on, activates the pump contactor. This same switch passes
control to the remote control connector, and disables local control. The second switch
selects heat or cool or neither. The heat position activates the heat circuit if the power switch
is on. The cool position activates the cool contactor when the power switch is on.
The cool circuit has a time delay, which controls the energizing of the compressor contactor.
Upon first actuation the delay is from 0 to 10 seconds before the compressor will turn on.
After the first actuation the delay is approximately 45 seconds, which allows time for the
compressor pressure to bleed down. This prevents a locked rotor condition and nuisance
blowing of fuses or circuit breakers.
The remote control Model 9000-RCS has one switch that turns the unit on in either the heat
or cool position.

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5. INSTALLATION
LOCATION5.1
Select a site for the unit which is level, provides clearance for air circulation, and is
convenient for plumbing and electrical connections. It is recommended the unit be mounted
at the same elevation as the chamber; do not exceed a difference in elevation of greater
than 25 feet.
Ventilation requirements, the unit circulates air for cooling of the refrigeration unit. Air is
drawn in from one end of the unit and exhausts air from the other end. The unit should have
two feet of clear space on each end for air circulation, plus sufficient volume of air to
dissipate the heat generated.
Preferably the unit should be located close to the chamber. The unit is quiet, clean, and
suitable for an indoor location.
If the unit is to be mounted outside, it should be protected from the environment, particularly
rain, heat and direct sun. While the unit is constructed of stainless steel, exposure to the
elements will accelerate the aging process. Exposure to heat will decrease the efficiency of
the cooling system. Outdoor locations generally require longer plumbing runs, which also will
decrease the efficiency of the unit.
ELECTRICAL5.2
The unit must be connected via a quick disconnect box, with 15 amp fuses. Power
requirements are 220 VAC, 50/60 Hz single phase. Voltage limits are 187 to 250 VAC; this
allows the unit to operate on either a 220 or 208 VAC configuration. When operating at 208
VAC or 50 Hz expect a 10% lower capacity.
Supply and return connections are routed to the chamber connections for the inside-
conditioning unit. Supply and return connections are 1/2" NPT (female); tubing runs should
be 3/4" tube. All tubing runs should be insulated with a closed cell pipe insulation material,
with a wall thickness of 3/4". Pressure rating of the tubing runs OUTSIDE OF THE
CHAMBER should be 50 PSI or greater, with a minimum temperature rating of 0 to 125oF.
Amron's recommendation is 3/4" soft copper tubing, for runs of up 50 ft. (25 ft. supply and 25
ft. return). For longer runs increase the tubing size to 1".
Connect the supply and return lines to the chamber inside conditioning unit connections on
the outside of the chamber. It does not matter which line is connected to which inside
condition unit connection.
Fill the unit with fluid, use 50% ethylene or propylene glycol and 50% water; fill to middle of
fluid sight glass. Turn unit on, check for leaks, and replenish fluid level when the system has
filled the tubing runs and the inside-conditioning unit. NOTE: Do not operate the system
without fluid, as the circulating pump requires fluid for lubrication and cooling.

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6. OPERATION
Turn the unit ON selecting either local or remote control. When operating in the local mode select
either heat or cool as required. If you wish to use the remote control, select the remote control
position on the power switch. Control of the system is then passed to remote switch. The system will
not start until either heat or cool is selected on the remote switch.
In the local mode of operation, turning on the power will start the circulating pump; the pump will run
regardless of the position of the Heat/Cool switch position. Heat or cooling is selected by moving the
Heat/Cool switch to the desired position. On the initial selection of cool there may be a slight delay
in the starting of the refrigeration compressor, 0-10 seconds. If the cooling is turned off and back on
there will be a delay of approximately 45 seconds before the compressor starts. This allows the
pressures within the compressor to bleed off, permitting easier starting and eliminates nuisance
blowing of fuses or circuit breakers.
Temperature control of the fluid is determined by system heat load and two internal limit controllers.
The system runs at maximum capacity, exchanging as much heat as possible. If the unit exceeds
the heat (heat/cooling) exchange requirement of the chamber, the unit will shut off the refrigeration
compressor or heater, upon reaching preset limits. The limit controller for cooling is factory set at
20oF (-3oC). The high temperature limit controller is factory set at 110oF (43oC). Upon reaching
the limit the system will continue circulating fluid through the chamber, when the temperature of the
fluid changes by approximately 5-10othe system will automatically start.
The limit controllers can be adjusted in the field by removing the covers and setting the temperature
control to the desired temperature.

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7. MAINTENANCE AND TROUBLESHOOTING
GENERAL7.1
Trained personnel should perform maintenance. A refrigeration technician should be used
for any servicing of the refrigeration system. An electrician can service the electrical system.
The balance of the system can most likely be serviced by either.
To gain access to the system, remove the side covers by removing the screws at the bottom
of the panels. After removing the screws on the side, slide the panels downward and
remove. To charge the system with Freon, remove both front and rear panels. The suction
service valve is located on the front side, on compressor. The discharge service valve is
located on the rear side, on the accumulator.
To charge or check Freon pressure, remove service valve covers, attach refrigerant gauges,
crack service valves. To add Freon, attach Freon bottle and use standard charging
procedures.
To check or set the high temperature limit controller, operate the unit in the heat mode with
the chamber internal conditioning unit shut off. Monitor supply thermometer on front panel or
place a calibrated thermometer in the reservoir and monitor the fluid temperature. Unit
should shut off at approximately 110oF. If unit does not shut off at the correct temperature
adjust the high temperature limit controller, (located on the upper level, front left side of the
reservoir). An easy way to adjust the controller is to note the present setting of the controller
and the point at which the heater did shut off and adjust accordingly. Example: The unit shut
off at 100oF and the controller is set at 105oF, the difference between the actual and the
desired is 10oF, therefore it will be necessary to raise the actual set point by 10oF. Set
temperature controller to 115oF and check the results.
The low temperature limit controller is set in the same manner. Allow the unit to operate until
the compressor shuts off and check the temperature. Adjust the controller, heat the unit up
slightly and run another test to check the set point.
The cool circuit has a second controller to stop the system in the event of loss of Freon. This
is the low-pressure controller mounted on top of the compressor electrical junction box. This
controller will also act as a low limit controller.
To adjust the time delay for the compressor, remove the cover from the electrical control
box. NOTE: Removing the cover exposes voltages that are hazards to life, this should only
be attempted by personnel qualified to work on electrical equipment. The time delay is
located in the upper left corner of the box.
Turn clockwise to increase delay time. Check by starting a cycle and timing the time for the
cool contactor to pull in.
To check internal fuses, disconnect power from system, remove cover from power control
box, remove fuses one at a time and check continuity. Replace blown fuses with fuse of
same value. If fuse blows a second time remove power and determine cause.

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TROUBLESHOOTING7.2
Problem Possible Cause
Unit does not cool Check Freon charge
Unit does not run Check power to unit
Unit does not run; power OK Check fuses to pump
Unit does not run, power OK; fuses OK Check for 24 VAC
Unit will not heat Check fuse; heater circuit.
Compressor will not start Check Freon charge; delay circuit.

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8. DRAWINGS
The following drawings illustrate the electrical and mechanical details of the External Conditioning
System unit. The drawings reference identifier numbers correspond to the parts list identifier
numbers to aid in the identification of parts used in the Model 9000-ECS.

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MODEL 9000-ECS, SPECIFICATIONS8.1

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CHAMBER CONDITIONING CONNECTION DIAGRAM8.2

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9000-ECS BLOCK DIAGRAM8.3