MYDAX 1M150W Manual

advanced temperature control technology
MYDAX, INC.
INSTRUCTION / OPERATION MANUAL
1M150W WATER COOLED CHILLER
MYDAX, INC.
12260 Shale Ridge Road
Auburn, CA 95602
[phone]
FAX: [phone]
http://www.mydax.com

Table of Contents
1M150W
APPENDIX A
RS-232 INTERFACE COMMANDS
SPECIFICATIONS................................................. 1
SAFETY & ENVIRONMENTAL CONCERNS.... 2
SYSTEM OVERVIEW ..........................................4
INSTALLATION ...................................................6
FRONT PANEL CONTROLS ...............................8
ALARM & ERROR MESSAGES........................ 10
DIAGNOSTIC DISPLAYS.................................. 11
SERVICE & WARRANTY.................................. 14
SHIPPING & STORAGE PROCEDURE ............ 15
DRAWINGS
PARTS LIST
FRAME DRAWING
FLUID DIAGRAM
ELECTRICAL DIAGRAM
DRAWINGS – Printed Circuit Boards
BOARD SCHEMATICS
MSDS: R-134A
Pump Instruction Manual: G&L, SSH

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 1
SPECIFICATIONS
SYSTEM CAPACITIES
Net Cooling Capacity at +11°C (+52°F) 43,988 Watts or 150,000 Btu/hr
Fluid Temperature Setpoint Range +8°C to +40°C
Temperature Stability ± 0.5°C
Recirculating Flow/Pressure 40 GPM @ 50 PSI
Includes flow indication relay contacts.
Polypropylene Reservoir Volume 44 Gallons
Recirculating Fluid Deionized Water
Deionization Maintenance Loop Automatically maintains water resistivity
at a minimum or 300K Ohms
Recirculating Supply/Return Fittings 2" Stainless Steel FPT
Facilities Supply/Return Fittings 1" Stainless Steel FPT
Facilities requirements up to 14 Gpm @ 70°F (7 Gpm @ 40°F), 20 PSI differential
Electrical Service 460/480 VAC, 60 Hz, 3 phase, 50 amp service
Physical Parameters 65" H x 36" W x 58" D, 1000 lbs dry weight
STANDARD FEATURES
This chiller is complete with our computer-controlled low-stress, refrigeration circuit, recirculating pump and
fluid reservoir. R-134A refrigeration circuit uses all-brazed construction for extra strength. The heavy-duty
frame is constructed of welded steel tubing.
The microprocessor-based control system includes an extensive computer monitoring capability including
comprehensive controls, error messages and diagnostics. System status is indicated via a two-row (40
characters each) alphanumeric LCD (liquid crystal display) and with red light-emitting diodes (LED's). The
control keyboard employs membrane switches with a sealed polycarbonate overlay for protection from liquid
spills.

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 2
SAFETY AND ENVIRONMENTAL CONCERNS
Your Mydax chiller was designed to give years of trouble-free operation. Features were designed into the unit to provide
early warning of failure mechanisms so that catastrophic failures can be avoided. Whether a chiller is at the factory or in
the field, diagnostic information gives Mydax engineers insight to the operation of each stage of the refrigeration and
recirculation circuits without having to attach service gauges.
1. Warning & Error Messages: including coolant over-temperature warning & shutdown, low tank level warning
& shutdown and others (see ERROR MESSAGES section).
2. System Diagnostics: including coolant & refrigerant temperatures, valve drives and parameters (see
DIAGNOSTIC DISPLAYS section).
3. Hardware safeguards include a series-wired interlock circuit that protects refrigerant high pressure, thermal
protection of the pump and compressor motors.
Safety is important when using and servicing the chiller unit. Warning labels have been placed on the chiller in areas
where potentially harmful conditions exist and in this manual to bring attention to such conditions. This chiller uses
materials that are subject to environmental regulations; be sure to familiarize yourself with these components and their
associated regulations pertinent to your location.
Warnings have been categorized according to the following guide:
! NOTICE Provides information that is important for proper installation, operation, or maintenance, but not
critical to safety. Includes regulatory notices.
! CAUTION Identifies situations where improper action could cause damage to the equipment or product, or cause
minor physical discomfort.
!WARNING Identifies situations where improper actions could cause minor to moderate injury or impaired health.
! DANGER Identifies potentially lethal hazards, where improper actions could cause death, or serious injury or
disability, such as loss of sight or limb.
Label 1
This "Hot Surface" caution label has been placed on the inside of the chiller cabinet, near the compressor's discharge area
where the hot compressed refrigerant makes components as hot as 120°C. This label is placed on the Oil Separator and
the Muffler as well. The label indicates that the area is hot and should not be touched until the unit is allowed to cool
down.

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 3
There are potentially hazardous materials within the cabinet; see the MSDS, in Appendix C of this manual, for more
information on these materials.
This chiller contains fluids that may be slippery if spilled on the floor. The use of a drip pan may be required as a
means of avoiding a potentially hazardous spill. Clean up of any spills should follow the guide provided in the
MSDS.
Service of the refrigeration equipment shall be performed only by qualified and certified, if necessary, personnel.
Refrigerant gas is not to be vented to the atmosphere; it shall be handled according to regulations set forth by the
local environmental authorities. Refrigerants are fluorocarbon type materials and subject to environmental
regulations.
The compressor uses POE oil; this MSDS is available from Mydax upon request. The compressor is hermetically
sealed and no service should be required. In the event that cleanup is necessary, absorb oil with oil absorbent
material and dispose of as a hazardous waste. Follow approved cleanup procedures as listed in the MSDS.
Label 2
This "Hazardous Voltages" danger label has been placed on the clear guard inside the electrical panel box and on
each power junction box within the chiller cabinet. The label indicates that there are hazardous voltages on the
components within the protective enclosure. Before servicing, the equipment shall be disconnected from the source
supply and locked out with an appropriate device.
Electrical maintenance shall be performed only by qualified electricians and trained service personnel.
LITHIUM BATTERY
The M1001 controller contains a Lithium battery to retain setup parameters and calibration data. If this battery were
to fail (see Test Panel 7 in the Diagnostic Displays section of this manual), it shall be replaced with a compatible
type, and the replaced battery shall be recycled as required by local environmental regulations.

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 4
SYSTEM OVERVIEW
System Fluid Schematic
REFRIGERATION
Refer to drawing #D2914, the fluid (refrigerant & coolant) schematic. The heart of this design is the refrigerant valves,
shown at the left side of the drawing. These are pulse-width-modulated valves, controlled directly by the system's
embedded microprocessor. By controlling the duration of the openings of the evaporator valve, a precisely determined
flow of refrigerant is sent to the evaporator, allowing for exceptionally stable recirculating temperatures. This system is
designed to control the recirculating output temperature to ±0.5°C or better.
The microprocessor sets the positions of the evaporator valve based upon the system heat load. If the load increases, the
evaporator valve is opened for longer durations, passing more refrigerant. If the load decreases, the evaporator valve is
opened for shorter durations, passing less refrigerant. The microprocessor controls the bypass valve independently,
shunting unneeded refrigerant through the bypass heat exchanger, where it is evaporated before it can reach the
evaporator. The superheat valve passes only enough refrigerant to maintain the proper gas temperature at the suction
inlet of the compressor. Using this technique, Mydax is able to run in load conditions of zero to full load and all
combinations in between.
During normal operation, the durations of the valve openings remain nearly constant. Only major changes in heat load or
system-wide power cycling cause large changes in the valve drives. In the case of a step-wise change in heat load, the
microprocessor quickly drives the valves to the new settings and refrigerant flow soon settles at the proper level.
The controller sets the valve drives based primarily upon data received from RTD's (resistance temperature devices)
located about the circuit. The drawing shows RTD's at the discharge line leading from the recirculating pump, at the
return line leading to the reservoir, between the condenser and receiver and at the compressor inlet. The controller reads
these and other sensors constantly and sets the refrigerant valves accordingly.
Thus refrigerant flow is truly proportioned, allowing continuous compressor operation without the normal addition of
pressure-actuated hot gas bypass valves. All other refrigeration circuit components are used as in conventional systems.
All permanent copper joints in the refrigeration circuit are brazed for extra strength. Much of the circuitry is insulated to
eliminate cooling capacity loss and unpredictable operation due to drafts or fluctuating ambient air conditions.
RECIRCULATION
This system is designed to recirculate deionized water. It is not designed to recirculate solutions of automotive antifreeze.
Approximately 50 gallons are required to fill the 44 gallon polypropylene reservoir and associated plumbing. The
reservoir is fitted with two level sensors; one level sensor drives a FILL TANK alarm at the main panel, indicating
coolant level has dropped somewhat. The second sensor, the TANK EMPTY sensor, is connected to the safety interlock
loop and shuts the system down if tripped.
By using the data from the in-line turbine flow meter, the microprocessor will engage the Flow-OK relay at the selected
GPM. The output of the relay is wired to a connector located on the rear panel of the unit, labeled "Flow OK", which can
be used to drive an external alarm. Further description of this is provided in the Installation chapter.
The system is equipped with a deionizing filter; water flow through the filter is controlled by the microprocessor to
maintain the water resistivity to between 300K and 500K ohms. The control algorithm will turn on the DI flow solenoid
below 300KΩand turn it off above 500KΩ. Bypass flow through this filter is restricted to 0.5 GPM.

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 5
System Electrical Diagram
Refer to drawing #D2923, the system electrical diagram. The central component of the electrical system is the M1001
controller. It is microprocessor-based and communicates with and/or controls various other circuit boards and
components. Most controller circuitry is laid out on circuit boards mounted in the main control cabinet. The controller is
powered as long as the system circuit breaker is set, receiving 24 VAC power from a bulkhead-mounted transformer.
The controller "reads" the RTD's in the system via board M1002, the Input Circuit Board, mounted on the frame. RTD's
are included for the recirculating temperatures, as well as for the refrigerant circuit. Also routed through the M1002
board are the 100 Ohm and 120 Ohm precision RTD calibration resistor circuits. The refrigerant valve drive signals and
the phase monitor circuit are routed through the M1004 power board.
The system interlock loop is controlled by the M1002 board. In this application the interlock loop consists of the
refrigerant over pressure switch, the TANK EMPTY level sensor, one power relay coil and a relay pole (RL1,B). The
RESET switch serves to feed power to the relay, which energizes the contactor. When energized, the contactor feeds
power back to the relay so the RESET switch may open up without cutting off power to the relay. If the refrigerant
switch or the level sensor trips, power to the loop is interrupted. The microprocessor senses this via the contactor
connection at pin 23 of the M1002 board. Provided the system has power, if the loop trips out, the controller drives the
PUSH RESET error message. Other diagnostic messages are also sent if the level sensors are tripped. The loop must be
reset when the fault condition, if present, is resolved.
The M1002 board also routes signals for the FILL TANK level sensor. If this sensor trips, the controller displays the
FILL TANK error message. A compressor crankcase heater is provided and is powered as long as the system circuit
breaker is set and AC line voltage is present.
The M1003 board reads the DI resistivity probes; the DI solenoid valve is driven from a digital output from the M1004
board.
A special feature exists on the M1010 board which engages a relay at a user-defined flow rate. The output of the relay is
wired to a BNC connector located on the rear panel of the unit, labeled "Flow OK". Further description of this is
provided in the Installation chapter.

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 6
INSTALLATION
POWER CONNECTION
Main electrical power connections to this system are made via a ten foot long power cord with a CS8165C plug.
This chiller requires a 50 amp circuit, 460/480 volt, 60 Hz, 3 phase.
DANGER: Prior to any electrical servicing inside either the power box or the chiller cabinet,
disconnect the power cord and lockout the main breaker with a lockout device.
Once the unit is wired and plugged in, turn on the main circuit breakers mounted on the front of the system.
The unit will not run without the proper phase wiring, if the display flashes “AC Power Fault”, unplug the cord
and swap two of the phase lines and re-check.
A message similar to the following appears on the 2 by 40-character main display:
This display indicates that the microprocessor is initializing. After a few seconds, the controller will finish
initializing and the "Warm-up Delay" message will return to simply "Mydax". Leave the unit turned on while
hooking up the following plumbing connections. This will allow time for the crankcase heater to warm the
compressor and separate the oil from the refrigerant.
WARNING: The system should be powered for a period of 1 hour before starting, to
allow the crankcase heater to separate the refrigerant from the oil.
CONDENSER FLOW
The condenser inlet and outlet fittings are 1" stainless steel female pipe thread fittings (FPT). Plumb the
facilities cooling water supply to the fitting marked CONDENSER IN. Plumb the facilities water return line to
the CONDENSER OUT connection. Given a facilities inlet temperature of +70°F, this chiller requires a flow
of up to 14 gallons per minute.
PLUMBING INTERFACE CONNECTIONS
The chiller's 2" stainless steel FPT fitting labeled TANK OUT must be plumbed to the inlet of the device to be
cooled. The outlet of the device to be cooled must be plumbed to the chiller's 2" FPT fitting labeled TANK IN.
This system is equipped with a 1/2" FPT fitting labeled DRAIN. A valve should be installed at this location
prior to the initial filling of the reservoir, for the convenience of future draining procedures. The recirculating
loop is under pressure when the system is operating.
Check all fluid interface connections now to ensure against leaks.
FILL RESERVOIR
This unit is designed to recirculate deionized water. To fill the system's reservoir, use a funnel or insert a hose
in the 1-1/2" fill port on the top of the reservoir and fill until the “Fill Tank” message is not present. Add
approximately 2 gallons of fluid after the “Fill Tank” message goes away to avoid nuisance alarms.
!
Tank --- Warmup Delay --- Local Set
12.10°C 0.0 G
p
m 400K
Ω
12.0°C
!

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 7
CAUTION: DO NOT USE AUTOMOTIVE ANTIFREEZE, residue build up will cause damage the
unit's critical components.
PUSH RESET BUTTON
The RESET button, located below the front panel, must be pushed after an error in the interlock circuit occurs
prior to restarting the system. This resets the power safety interlock loop, which protects the operator and
electrical circuitry.
EXTERNAL "FLOW-OK" RELAY CONTACTS
This unit is equipped with a normally-open relay for an external flow indication. Located on the rear panel
is a BNC connector, labeled "Flow-OK"; the outer shield is common, inner pin is the normally-open
contact. When an adequate flow condition is satisfied, the relay will close the contacts. This feature's trip-
point is settable from 5 to 20 GPM on Test Panel 6; see description in the DIAGNOSTIC DISPLAYS
section of this manual, under TEST PANEL 6.
OUTPUT FLOW ADJUSTMENT VALVE
To adjust the flow and pressure of the recirculation loop, adjust the valve on the rear of the unit labeled "Water
Flow Adjustment Valve". The 100 PSI “Output Pressure” gauge, located on the rear bulkhead, will indicate the
output pressure after the valve. The pressure gauge labeled “Pump Pressure” indicates the internal pump
pressure. The flow rate is visible on the front LCD display panel.
BYPASS VALVE
To divert the recirculation flow from the output path back to the tank, first open the Bypass valve, then close the
output flow adjustment valve. To return from this mode, reverse the procedure; always keeping adequate flow
through the flowmeter. If the flowmeter sees less than 10 GPM flow, the chiller will shut down to protect the
pump.
An integrated pressure switch will shut down the chiller at an output pressure of 65 psi; if the backpressure is
near 60 psi, this bypass valve should be opened when starting the pump to prevent the switch from kicking out.
DEIONIZATION FILTER
The system is equipped with a deionizing filter; water flow through the filter is controlled by the
microprocessor to maintain the water resistivity between 300K and 500K ohms. On a yearly basis, or if the
unit is unable to maintain resistivity to acceptable level, replace with Mydax part# F1003. This mixed-ion
resin cartridge filter is only available from Mydax.
25 MICRON PARTICLE FILTERS
On the rear of the chiller is two 20 inch particle filters; the two filters are plumbed in parallel to reduce the
pressure drop at the designed high flow volume. Maintenance of these filters shall be to replace them with
like type (DGD-2501-20) when or if the available flow and/or pressure becomes unacceptable. This time
period will depend on the application and usage, as well as the cleanliness of the system.
BNC "Flow-OK" Relay
Normally Open
Common
!

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 8
FRONT PANEL CONTROLS
All Mydax chillers are controlled by a microprocessor which is accessed via the system control panel. System controls
are simple, yet powerful and in concert with built-in diagnostics and error messages, are exceptionally comprehensive.
POWER LED: Indicates unit is powered (the circuit breaker is set).
RESET: Must be pressed prior to system start-up to energize the interlock loop.
DISPLAY:
Shows the actual Output Temperature and Setpoint Temperature in °C. Also indicates that
the local SET TEMPERATURE MODE can be enabled. Additionally, the recirculation flow
rate is displayed in gallons-per-minute (Gpm), as well as the water resistivity.
START: Starts compressor and pump and turns on LED's.
STOP: Stops both the compressor and pump.
MUTE ALARM: May be used to deactivate audible alarm for 10 minutes, leaving alarm LED on. Pressing the
CLEAR key reactivates the alarm, which sounds until the fault condition is eliminated or the
MUTE ALARM switch is depressed again. Pressing MUTE ALARM when no alarm is
active causes the alarm to sound once and the TEST ALARM display to appear.
SET: Enables SET TEMPERATURE MODE. SET MODE is disabled from panel if an alarm is
active or if the unit is in REMOTE. To set, depress:
SET: "Set Mode" appears at the right of the display. Cursor flashes at
"units" digit of the temperature display.
ARROWS KEYS: Changes temperature setting in one degree increments unless "."
(decimal) key is depressed.
"." (DECIMAL): Moves cursor to the "tenths" digit of the temperature display and
causes arrow keys to change setting in tenths of a degree.
KEYPAD: Changes temperature setting by entering numbers directly.
CLEAR: Erases an incorrect entry.
ENTER: Selects temperature setting and deselects SET mode.
TEST: Initiates Test Mode. See description under DIAGNOSTIC DISPLAYS section of this
manual.
ENTER: Enters temperature selections while in the SET mode.
CLEAR: Erases incorrect temperature selections; exits Test Mode; clears Mute Alarm selection.
MODE: Toggles between the optional RS-232C remote control mode, when present, and Local Set
mode.
Tank --- MYDAX --- Local Set
21.50°C 40.0 G
p
m 400K
Ω
25.0°C

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 9
ARROW KEYS: Changes temperature setpoint by 0.1°C or 1°C increments/decrements; toggles tank
temperature, setpoint temperature and evaporator data view modes for multiple channel
systems.
"." (DECIMAL): Display shows model number and software revision date and copyright:
RUN PUMP: Inactive in this system..
X & Y: For future use.
Z: See Test Panel 9 in the Diagnostic Displays Section.
Model # Date
Copyright 2003 Mydax, Inc.

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 10
ALARM & RROR MESSAGES
A unique feature of Mydax systems is the error messages displayed on the 2 by 40-character liquid crystal display
(LCD). The microprocessor constantly checks various points and parameters throughout the system and automatically
displays messages when error conditions are sensed. Many displays are announced by an audible alarm and LED
indicator. The error message persists until the fault condition is resolved, provided that the fault condition was not fatal,
resulting in a system shutdown.
Condenser Hot Indicates high discharge pressure condition with temperature over +50°C. This is a warning message
only. A separate mechanical over pressure switch, part of the safety interlock loop, shuts the system
down in case of an over pressure condition. The purpose of this message is to allow maintenance
workers to correct the problem at an early stage. (Caused by a clogged filter, low or warm condenser
cooling water flow or condenser scale build-up.)
Fill Tank #1 Indicates low tank liquid level; this is a warning message.
Extreme Temp Indicates that the reservoir temperature is either more than 10°C above the highest allowable setpoint
(+50°C) or that it is too close to freezing (+4°C). The microprocessor shuts down the system with a
fatal alarm.
Push Reset Indicates that a fatal alarm in the interlock circuit has occurred and the operator must push the “Reset”
button on the front face of the chiller in order to restart the system.
A series-wired safety interlock loop protects all Mydax systems, disconnecting AC power from nearly
all circuitry. The loop consists of the refrigerant pressure switch and the "tank empty" float switch. If
any link in the loop is opened, the "Push Reset" error message is displayed. Once the fault is
corrected, the Reset button must be used to re-establish loop integrity.
AC Power Fault: Generated by the Line Voltage Monitor, the system is shut down to prevent damage due to: low
AC voltage (<440V) or unbalance (4% for > 5 seconds), phase loss or phase reversal (> 100
milliseconds). On initial power-up, reverse two lines to achieve proper phase sequence.
Low AC Line Indicates a low voltage condition exists on the input AC line.
Open RTD Indicates that an RTD connected to the M1002 Input Board has failed and that the system has shut
down to prevent damage due to lack of data. The RTD at fault may be located by accessing Test Panel
8. The RTD must be replaced for the system to operate again.
Low Flow Indicates that the flow rate, in the recirculation loop, is lower than 5GPM; this is a value set in the
firmware. This shuts down the chiller, with a fatal alarm, to protect the pump.

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 11
DIAGNOSTIC DISPLAYS
Mydax chillers are provided with a computerized self-diagnostic capability. This system is equipped with 9 different test
panels, which are accessed by pressing the TEST key, followed by the test panel number. Diagnostic mode is terminated
by pressing the CLEAR key, and results in a display similar to that below:
MAIN DISPLAY:
Diagnostic messages are displayed on the main 2 by 40-character LCD. Display 5 automatically appears when the TEST
key is first depressed. Once in diagnostic mode, other displays can be selected by depressing number keys 1 through 9.
The following describes each of the test displays:
TEST PANEL #1:
Numbers represent the drive signals for the evaporator, bypass and superheat valves and tank heaters. Heater
values are inactive in this system. The range is 0 (minimum) to 20 (maximum drive). Each digit represents 5%
of the available 24V drive voltage. Avg Valve shows a 32 second running average of the valve's drive,
displayed above it.
TEST PANEL #2:
This display shows the refrigerant circuit RTD temperatures in °C. The display reads:
Limit = Max Evaporator Temp Suct = Suction Temp Psia = Suction Pressure (absolute)
Sup.Ht = Superheat Temp SHavg = Avg Super Ht Temp Cond = Condenser Temp
The condenser reading is a direct indicator of condenser temperature and pressure. The microprocessor sends
the CONDENSER HOT error message if the condenser temperature exceeds +54°C.
TEST PANEL #3:
The first 3 sets of 4-digit numbers are hexadecimal. They represent correction values for the slow gain servos
for up to 3 reservoirs. The function of this servo is to dynamically adjust the main temperature control servo to
near zero error and thereby maintain temperature stability.
The first 2 digits in each set of 4 show the gain offset. Each increment equals 0.05°C, so 14 Hex = 20 decimal
= 1.0°C. This value is internally subtracted from the operator-entered temperature set point if the actual
temperature is above the set point, thus reducing the coolant temperature. The set point offset is continuously
monitored by the controller and adjusted according to current conditions.
The second 2 digits in each set of 4 show the time prescaler. This is a counter which increments or decrements
once a second and times the next update of the set point offset. A typical value is 20 seconds per offset change.
When the count reaches "00", the offset may or may not be changed and the count resets to "0A" Hex (10
decimal). Together these numbers show that the controller is internally changing the control set point to
Tank --- MYDAX --- Local Set
24.95°C 35.8 Gpm 400KΩ25.0°C
Valve 5 11 18 Htr 0
Avg Valve 0 6 15 Htr 0
-5.0°-11.4°25.5 13.5°8.0°38.4°
Limit Suct Psia Sup.Ht SHavg. Condr
302B 0000 0000 Z 0.00 G 51.95 8.0
SS-1 SS-2 SS-3 RTD Reference SH Avg

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 12
maintain temperature stability, and give the magnitude and timing of the change.
The center of the display shows readings for the RTD "Zero" and "Gain" calibration resistors. Precision 100Ω
and 120Ωresistors (0.1% tolerance or better, representing ideal nominal RTD's) are used as a reference.
TEST PANEL #4:
This display shows auxiliary voltmeter readings of Ext 1, Ext 2 and Ext 3. Ext 1 is the voltage reading from the
integrated flowmeter. Ext 2 and Ext 3 are unused. VAC is the 24 VAC internal control voltage. A typical
value is in the range of 22.00 to 28.00. To the right of this value is an unused single-digit number ranging from
0 to 3. At the far right of this display is a time indicator in seconds. The timer stops at 255 seconds and is used
internally for turn on routine procedures.
TEST PANEL #5:
This diagnostic shows the Output (Tank) RTD temperature in °C, the Output Setpoint temperature and Output
temperature slope. Slope is a measure of the direction and amount of the output temperature change per 60
seconds.
TEST PANEL #6:
This panel shows the trip point, above which, the Flow-OK contact is engaged; the trip-point is settable from 2
to 25 GPM by using the UP/DOWN (↑,↓) arrows on the keypad. By using the data from the in-line turbine flow
meter, the microprocessor will disengage the Flow-OK relay below the selected GPM. The output of the relay is
wired to a BNC connector, labeled "Flow OK", located on the rear panel of the unit. The shield and center pin
are the normally-open contact, which closes when flow is above the trip point.
The temperature of the Input fluid (return) to the chiller is monitored by an RTD, and displayed here for
reference. See the drawing Chiller Fluid Schematic at the end of this manual.
TEST PANEL #7:
This left-most six numbers of the display shows voltmeter readings for up to 3 optional water resistivity monitor
interface raw data outputs. Only the first column is used in this system.
The refrigerant type that the control system is calibrated for is shown. For example: R134A
The two numbers at the top, far right-hand side of this display represent the internally computed maximum
evaporator temperature and a counter ranging from 0 to 99, which are used to adjust the valve drives and
regulate the superheat temperature.
The second line of the right side of this display indicates the status of the lithium battery, mounted on the
M1001 circuit board, used to run the system's elapsed run-time clock depicted in Test Panel 8 and the run/event
recorder depicted in Test Panel 9. A "Bat. OK" message indicates that the battery is operational, while a "No
Bat." message indicates that the battery is dead and should be replaced.
-2.583 -0.000 -0.000 +24.13 0 255
Ext 1 Ext 2 Ext 3 VAC Secs
24.95 25.0 0.0
Tank Set DgMin
15 12.45°C
Flow Relay Gpm Input
- 0.432 -0.000 -0.000 R134A - 5.00 0
+ 0.485
-
0.000
-
0.000
Bat. OK

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 13
TEST PANEL #8:
The top left side of this display shows the alarm (error message) history. If there have been no alarms since the
last history reset, the display reads "No Alarms". If alarms have occurred, the display shows them in sequence,
like the main display. The history can be cleared 3 ways:
1. Power Off/On
2. Press START Key when unit is stopped
3. Press 0 Key when viewing Test Panel 8
The second line of the display can be read when the chiller is stopped. It indicates the reason that the chiller
was last stopped: KEY, FATAL, RS232 or EXT. The right side of the second line indicates the elapsed run
time on the system in days (from 0 to 9999), hours, minutes and seconds. This system is equipped with a
battery which, if operational, saves the elapsed run time value when the system is stopped and restarted. The
elapsed run time is reset each time the system is restarted.
TEST PANEL #9:
This display provides run/event recorder data. The run/event recorder continuously records important
information into a non-volatile memory while the system is operating. Data is stored at one-second intervals for
the last 120 seconds of run time and it is also stored at two-minute intervals for the last 240 minutes of run time.
The first line of this display indicates the run time in hours, minutes and seconds prior to the last system
shutdown, the output and setpoint temperatures of whichever recirculating channel was last selected at the Main
Display and the system-wide alarm history. The second line indicates which recirculating channel was last
selected at the Main Display, the evaporator, bypass, condenser and superheat RTD temperatures in °C, the
average superheat temperature from Test Panel 3 and the flow rate. Both the evaporator temperature and the
flow rate are specific to the recirculating channel being viewed. All refrigerant circuit RTD temperatures are
truncated to the nearest 1°C for this display.
After the system is stopped and Test Panel 9 is selected, the memory is displayed at the last or most recent
second (T- 0: 0: 0). The downward arrow key can be used to decrement time into the past. There are 120 "1-
second slots" and 120 "2-minute slots". If the downward arrow key is held down, the time slots decrement at
the rate of two slots per second. The upward arrow key increments to more recent time slots. If the "Z" key is
depressed, the display goes to the oldest 1-second slot (T- 0: 1:59 if the actual run time was of at least that
duration). If the "9" key is depressed while viewing Test Panel 9, the display reverts back to "T- 0: 0: 0", the
stop time.
The alarm messages are accurate for the slot that is current. If the display is on the minutes slot, then the alarms
indicated are any which have occurred during that 2-minute interval. Alarm messages cycle or flash in an
identical fashion to those appearing in either the Main Display or in Test Panel 8.
Alarms: Fill Tank !
KEY Run 356d 11:31:25
T- 0:24 14.95 15.0 No Alarms.....
Tank1 -11.4Ev -59B
y
38Cd 13Sh 8SA 5.8G
pm

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 14
SERVICE & WARRANTY
If a unit malfunctions, please contact the Mydax Service Department as soon as possible. Many small problems can lead
to large problems if not dealt with immediately. Please have the serial number and model number on hand when calling.
Mydax Service Department: [phone] FAX: [phone]
Email: [email protected]
RETURN OF UNIT FOR SERVICE
Many problems may be repaired by field exchanges of a module, pump, controller, etc. If return is required,
please obtain a return authorization number from the Mydax Service Department or the unit may not be
accepted at our receiving dock.
Please refer to the shipping instructions which follow.
SERVICE OF REFRIGERATION UNIT
Nearly all repairs to the refrigeration unit involve brazing or silver soldering. This should only be done by a
person trained in refrigeration service and familiar with the Mydax system.
NOTE: Before servicing any refrigeration unit involving brazing, remove all refrigerant from the system.
Evacuate to a 400 micron vacuum to remove refrigerant residues, then open all service valves to dry
air or dry nitrogen before use of a torch.
In particular, service of Mydax refrigeration circuits requires attention to the following:
1) Use caution to protect components from heat damage.
2) Prevent any moisture from entering the circuit, as Mydax proportional valves do not function with moisture
present. Once moisture has entered the system it cannot be removed.
3) Remove insulation and instrumentation wiring or use heat shields to protect them from torch heat during work.
4) Before recharging the circuit, evacuate it to 200 microns at a minimum room temperature of 75°F for three
hours, or longer for units with 4 horsepower or larger compressors.
ONE YEAR WARRANTY
Mydax, Inc. warrants that its temperature control system, and the component parts thereof, will be free from defects in
workmanship and materials for a period of one year from the date of delivery. In the event that warranty service is
required, the customer is requested to send the equipment freight prepaid to the factory for service. Mydax will then
perform the appropriate service and will return the equipment freight prepaid.
If field service is required during the warranty period, the customer will be responsible for all travel expenses including
airfare, car rental, lodging and meals. The customer will not be invoiced for any warranty service performed, with regard
to either labor or materials, during a field service visit.

Mydax, Inc. 1M150W Water Cooled Chiller
Designed for Lockheed Martin 15
RESHIPPING & LONG-TERM STORAGE PREPARATION
Reshipped systems should be protected from freezing temperatures in shipment or during long-term storage, or serious
damage may result. Freezing temperatures can be encountered in air and over-mountain surface shipments in any month
of the year.
In-transit freeze-up can occur in the recirculating coolant loop and in a water-cooled condenser's water circuit. To protect
against freezing, all water must be removed from these circuits, or ethylene glycol must be added.
This system has a water-cooled refrigeration condenser. The following instructions apply to shipment or long-term
storage preparation:
1) If the system has been run with water, ethylene glycol should be added to the recirculating loop. Verify that the
concentration of ethylene glycol approaches 50% (measure with a hydrometer) in the recirculating loop before
draining.
2) Once the proper ethylene glycol concentration has been attained, the mixture should be drained from the
recirculating loop. The system is provided with a DRAIN fitting for this purpose. Remove as much coolant as
possible to prevent ice-up in the small "nooks & crannies" of the plumbing.
3) As much coolant as possible should be drained from the system before shipment. Coolant adds significant
shipping weight and may damage electrical parts if it sloshes out of the tank.
4) Plug the TANK IN, TANK OUT, FILL and DRAIN fittings to avoid leakage of any residual coolant during
shipment or storage.
FAILURE TO PERFORM THESE STEPS
PRIOR TO SHIPMENT MAY VOID THE WARRANTY.
Call Mydax for shipment preparation help, if needed, at [phone]