MYDAX 1M9W-S Maintance Manual

advanced temperature control technology

MYDAX, INC.

INSTRUCTION/OPERATIONS MANUAL

1M9W-S WATER COOLED CHILLER

Serial Number 120-07XX

MYDAX, INC.

12260 Shale Ridge Road

Auburn, CA 95602

[phone]

FAX: [phone]

March 2001

TABLE OF CONTENTS

I. SPECIFICATIONS ....................................................................................................... 1

II. SYSTEM OVERVIEW ................................................................................................. 2

III. INSTALLATION ......................................................................................................... 4

IV. FRONT PANEL CONTROLS ..................................................................................…… 5

V. ERROR MESSAGES ................................................................................................... 7

VI. DIAGNOSTIC DISPLAYS .......................................................................................... 8

VII. SERVICE & WARRANTY .......................................................................................…. 11

VIII. RESHIPPING & LONG-TERM STORAGE PREPARATION ............................ ..................… 12

IX. APPENDIX A: RS-232C SERIAL INTERFACE OPERATION

X. APPENDIX B: DRAWINGS

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Mydax, Inc. 1M9W-S Water Cooled Chiller

SPECIFICATIONS

SYSTEM CAPACITIES

Cooling Capacity @ +20°C 2500 Watts

Coolant Temperature Setpoint Range +15°C to +25°C

Coolant Output Temperature Stability

Polypropylene Reservoir Volume 10 Gallons

Recirculating Coolant Low Conductivity Water

Coolant Flow/Pressure 10 Gpm @ 100 Psi (Bypass Provided)

Recirculating Supply/Return Fittings 1" Stainless Steel FPT

Condenser Water @ 75°F 1.5 Gpm Required (∆P = 20 Psi)

Condenser Water Connections 1/2" Stainless Steel FPT

Electrical Service 208/230 volt, 60 Hz, 3 phase, 20 amp

Physical Parameters 42"H x 24"W x 33"D, 450 lbs.

STANDARD FEATURES

System is complete with microprocessor-controlled low-stress refrigeration circuit, recirculating pump and fluid
reservoir. R-22 refrigeration circuit uses all-brazed construction for extra strength. The heavy-duty frame is
constructed of welded steel tubing equipped with locking casters.

±

0.05°C

With 10' line cord and L15-30P plug.

The microprocessor-based control system includes an extensive 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. This chiller
is complete with a liquid-filled panel mounted pressure gauge, an internal pressure bypass circuit, a full-flow
10 micron particulate filter and an RS-232C Interface for remote control and monitoring.

SAFETY FEATURES

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 & freon temperatures, valve and heater drives and others (see
DIAGNOSTIC DISPLAYS section).

3. Integral compressor refrigerant high pressure protection.

4. Circuit breaker & contactor.

5. Interlock loop, including reset switch.

6. Thermal protection of pump and compressor motors.

7. Manufactured and wired in accordance with IBM Non-Product Safety Design Standards.

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SYSTEM OVERVIEW

System Fluid Schematic

Refer to drawing #B2343, the fluid schematic. The heart of the design is the evaporator valve. This is a thermal-electric
expansion valve, controlled directly by the system's embedded microprocessor. Hermetically sealed, it consists of a
spring-loaded needle valve in contact with a bimetallic plate. The plate is wound by a coil of wire connected to terminals
on top of the valve. The curvature of the plate, and therefore the position of the needle valve, varies with its temperature
which is controlled by electrical current flow through the coil. So by controlling the duration of electrical pulses applied
to the valve terminals, the microprocessor opens the valve to a precisely determined point. This passes a precisely
determined flow of freon to the evaporator, allowing for exceptionally stable recirculating temperatures. This system
is designed to control the recirculating output temperature to ±0.05°C across the system operating range.

The microprocessor sets the exact position of the valve based upon the system heat load. If the load increases, the
evaporator valve is opened slightly, passing more refrigerant. If the load decreases, the valve is closed slightly, passing
less refrigerant. During normal operation, the position of this valve stays nearly constant. Only major changes in heat
load or system-wide power cycling cause large changes in the valve opening. In the case of a step-wise change in heat
load, the microprocessor quickly drives the valve to the new setting and refrigerant flow soon settles at the proper level.

The valve drive setting is based primarily upon data received from RTD's (resistance temperature devices) located about
the circuit. The drawing shows RTD's at the evaporator valve, at the discharge line from the pump, at the reservoir and
between the condenser and receiver. The microprocessor "reads" these and other sensors constantly and sets the
refrigerant valve accordingly.

Thus refrigerant flow is truly proportioned, through a valve which only rarely cycles all the way open or shut. Besides
precise temperature control, this allows continuous compressor operation without the normal addition of cycling, and
therefore failure-prone, 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.

This system is designed to recirculate water. It is not designed to recirculate solutions of automotive antifreeze.
Approximately 10 gallons are required to fill the polypropylene reservoir. The heating elements are stainless steel
cartridge heaters. The freon evaporator is a coaxial heat exchanger, located in the recirculating return line leading to the
reservoir.

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. Note that "empty" is a relative term only. The real function of this sensor
is to prevent the coolant level from dropping so low as to expose the pump suction line.

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Mydax, Inc. 1M9W-S Water Cooled Chiller

System Electrical Diagram

Refer to drawing #B2344, 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. RTD's are included for the recirculating output
temperature and the reservoir, as well as for the freon circuit. Also routed through this board are the 100 and 120 •
precision RTD calibration resistor circuits. The evaporator valve drive signal is routed through board M1004, as is the
phase detector circuit.

The system interlock loop is controlled by the M1002 circuit board. In this application the interlock loop consists of the
freon high pressure switch, the tank over-temperature switch, the TANK EMPTY level sensor, the RESET momentary
switch, one power relay coil and a relay pole (1R 5-8). 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 freon pressure switch, the over-temperature switch or the level sensor
trips, power to the loop is interrupted. The microprocessor senses this via the M1002 board. Provided the system has
power, if the loop trips out, the controller drives the PUSH RESET error message. The loop must be reset when the fault
condition is resolved.

The M1002 board also routes signals for the FILL TANK level sensor. If this sensor trips, the microprocessor drives
the FILL TANK error message.

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Mydax, Inc. 1M9W-S Water Cooled Chiller

INSTALLATION

POWER CONNECTION

This chiller requires a 20 amp or larger circuit, 208/230 volt, 60 Hz, 3 phase and is equipped with a line cord
and twist-lock L15-30P electrical plug.

PLUMBING INTERFACE CONNECTIONS

The chiller's 1" female pipe thread (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 1" FPT fitting
labeled "TANK IN". This system is equipped with a ½" FPT fitting labeled "DRAIN". It may be desirable to
install a valve at this location prior to the initial filling of the reservoir, for the convenience of future draining
procedures.

The condenser cooling water supply must be plumbed to the chiller's ½" FPT fitting labeled "CONDENSER
IN". The chiller's ½" FPT fitting labeled "CONDENSER OUT" must be plumbed to either a drain or the return
path of the condenser cooling water circuit. Verify that condenser cooling water into and out of the chiller is
unobstructed. Obstructions may cause loss of cooling capacity and eventual overheating.

Both the recirculating loop and the condenser cooling water loop are under pressure when the system is
operating. Check all fluid interface connections now to ensure against leaks.

CIRCUIT BREAKER

Set the circuit breaker mounted on the front of the system. Upon setting the circuit breaker, a message similar
to the following appears on the 2 by 40-character main display:

This display indicates that the system's phase monitor circuit is checking for correct electrical power phase
relationship. Should a live and ground line be reversed, the phase detector reads PHASE MISSING. Correct
the error and the controller no longer indicates PHASE MISSING. If the display reads PHASE REVERSED,
disconnect and switch two of the three phases.

FILL RESERVOIR

To fill the system's reservoir, unscrew the fill plug on the top of the vertical stand-pipe for the tank and pour
in the recirculating fluid. If the system is powered before the tank is filled, the "FILL TANK" error message
is displayed at the main panel, the alarm LED is lighted and the audible alarm sounds. Filling the tank
eliminates the alarms. Replace the plug.

Output --- Warmup Delay --- Local Set

20.02°C 20.0°C

WARNING

The system should be powered for a period of ½ hour before starting, to

allow the crankcase heater to separate the refrigerant from the oil.

PUSH RESET BUTTON

The Reset button, located below the main panel, must be pushed upon powering the system. This resets the
power safety interlock loop, which protects the operator and electrical circuitry.

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Mydax, Inc. 1M9W-S Water Cooled Chiller

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:

RESET:

START:

STOP:

MUTE ALARM:

SET:

Indicates unit is powered (the circuit breaker is set).

Must be pressed prior to system start-up to energize the interlock loop.

Starts compressor and pump and turns on LED's. Once the start-up routine is complete the
display changes to the MAIN DISPLAY:

Output --- MYDAX --- Local Set

20.02°C 20.0°C

Shows the actual Output Temperature and Setpoint Temperature in °C. Also indicates that
the local SET TEMPERATURE MODE can be enabled.

Stops both the compressor and pump and blanks the display.

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.

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:

TEST:

ENTER:

CLEAR:

MODE:

ARROW KEYS:

SET:

ARROWS KEYS:

"." (DECIMAL):

KEYPAD:

CLEAR:

ENTER:

Initiates Test Mode. See description under DIAGNOSTIC DISPLAYS section of this manual.

Enters temperature selections while in the SET mode.

Erases incorrect temperature selections; exits Test Mode; clears Mute Alarm selection.

Toggles between the RS-232C remote control mode and Local Set mode.

Changes temperature setpoint by 0.1° or 1°C increments/decrements; toggles tank

"Set Mode" appears at the right of the display. Cursor flashes at
"units" digit of the temperature display.

Changes temperature setting in one degree increments unless "."
(decimal) key is depressed.

Moves cursor to the "tenths" digit of the temperature display and
causes arrow keys to change setting in tenths of a degree.

Changes temperature setting by entering numbers directly.

Erases an incorrect entry.

Selects temperature setting and deselects SET mode.

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Mydax, Inc. 1M9W-S Water Cooled Chiller

temperature, setpoint temperature and evaporator data view modes for multiple channel
systems.

"." (DECIMAL):

RUN PUMP:

X & Y:

Z:

EMO SWITCH:

Display shows model number and software revision date and copyright:

1M9W-S 2001.01.18
Copyright 2001 Mydax, Inc.

Inactive in this system.

For future use.

See Test Panel 9 in the Diagnostic Displays Section.

This is a large red emergency off switch mounted on the left of the main panel. It shuts down
the entire system, excluding the controller.

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Mydax, Inc. 1M9W-S Water Cooled Chiller

ERROR 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

Fill Tank

Tank Too Hot

Push Reset

Phase Missing

Indicates high discharge pressure condition with temperature over +50°C. This is a warning message
only. A separate mechanical overpressure switch, part of the safety interlock loop, shuts the system
down in case of an overpressure 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.)

Indicates low tank liquid level.

Indicates that the reservoir temperature is more than 10°C above the highest allowable set point.
Microprocessor shuts down the system.

Indicates that the reset button has not been pushed since the last system power-up or that the system
interlock loop has a fault condition.

A series-wired safety interlock loop protects all Mydax systems, disconnecting AC power from nearly
all circuitry. The loop consists of the freon pressure switch, tank "hot" sensor and low level 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. The reset button must also be
pushed at system power up.

Indicates that one or more electrical phases are missing.

Phase Reversed

Low AC Line

Open RTD

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Indicates that electrical phases are incorrectly connected. Reverse any two legs.

Indicates a low voltage condition exists on the input AC line.

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.

Mydax, Inc. 1M9W-S Water Cooled Chiller

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

Output --- MYDAX --- Local Set

20.02°C 20.0°C

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:

Valve 7 Htr 8
Avg Valve 5 Htr 6

Numbers represent the drive signals for the evaporator valve and tank heater. The range is 0 (minimum) to 20
(maximum drive). Each digit represents 5% of the available 24VDC 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 Psig = Suction Pressure
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 setpoint if the actual
temperature is above the setpoint, thus reducing the coolant temperature. When the actual coolant temperature
is below setpoint, the main servo is driving a heater and no adjustment is made to the setpoint. The setpoint
offset is continuously monitored by the controller and adjusted according to current conditions.

4.0 -4.8 48.2 35.0
Limit Suct Psig Sup.Ht SHavg Condr

302B 0000 091F Z 0.00 G 51.95 14.4
SS-1 SS-2 SS-3 RTD Reference SH Avg

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 setpoint 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 setpoint to
maintain temperature stability, and give the magnitude and timing of the change.

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Mydax, Inc. 1M9W-S Water Cooled Chiller

The center of the display shows readings for the RTD "Zero" and "Gain" calibration resistors. Precision
resistors 100Ω and 120Ω (0.1% tolerance or better, representing ideal nominal RTD's) are used as a reference.
Typical readings are shown.

TEST PANEL #4:

This display shows auxiliary voltmeter readings of Ext 1, Ext 2 and Ext 3. These are not used in this system.
VAC is the 24 VAC internal control voltage; a typical value is in the range of 22 to 28. To the right of this
value is a 0. 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 temperature slope. Slope is a measure of the direction and amount of the output temperature change
per 60 seconds.

TEST PANEL #6:

This diagnostic shows the Tank temperature with resolutions of 0.05°C and 0.01°C, and the Output temperature
with resolutions of 0.05°C and 0.01°C.

-5.294 -1.292 -1.308 +26.46 0 255
Ext 1 Ext 2 Ext 3 VAC Secs

20.00 20.0 0.0

Tank Set DgMin

Output

RTD (coolant) temperature in °C, the Output Setpoint temperature and

19.80 19.79 20.00 20.02

TEST PANEL #7:

This display shows voltmeter readings for up to 3 optional water resistivity monitor interface raw data outputs.
Each resistance monitor channel has a positive and a negative voltage reading. These readings are
approximately equal, but are of opposite polarity.

The refrigerant type that the control system is calibrated for is shown. For example:

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.

TEST PANEL #8:

The top left side of this display shows the alarm (error message) history. If there have been no alarms since the

+ 0.000 + 0.000 + 0.000 R22 6.00 0

- 0.000 - 0.000 - 0.000 Bat. OK

R22

Alarms: Fill Tank !
KEY Run 356d 11:31:25

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Mydax, Inc. 1M9W-S Water Cooled Chiller

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 freon 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 "1­second 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.

T- 0: 0: 0 20.02 20.0 No Alarms.....

Tank 1 4Ev 0By 37Cd 13Sh 14SA Gpm

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

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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]

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 freon from the system. Evacuate

to a 400 micron vacuum to remove freon 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.

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
mileage. The customer will not be invoiced for any warranty service performed, with regard to either labor or materials,
during a field service visit.

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Mydax, Inc. 1M9W-S Water Cooled Chiller

RESHIPPING & LONG-TERM STORAGE PREPARATION

Reshipped systems should be protected from freezing temperatures in shipment or serious damage may occur. Freezing
temperatures can be encountered in air and over-mountain surface shipments in any month of the year. In-transit freeze­up can occur in the recirculating coolant loop and in a water-cooled condenser's cooling loop. To protect against
freezing, all water must be removed from these circuits, or ethylene glycol must be added.

This system has a
preparation:

1. Feed in a charge of water-glycol mix into the condenser through the "Condenser In" connection. This can be
done by pump or gravity flow.

2. Feed water-glycol until mixture is visibly flowing out of the "Condenser Out" connection.

3. Plug the "Condenser In" and "Condenser Out" fittings to avoid leakage in shipment.

4. Since the system has been run with water, remove it from the reservoir via the "Drain" fitting. As much water
as possible should be drained from the system before shipment. Water adds significant shipping weight and
may damage electrical parts if it sloshes out of the tank.

5. Continue to remove as much water as possible with a wet/dry vacuum to prevent ice-up in the small "nooks &
crannies" of the plumbing.

6. Plug the "Tank In", "Tank Out" and "Drain fittings.

water-cooled

refrigeration condenser. The following instructions apply to shipment or storage

Call Mydax for any help

needed at [phone]

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Mydax, Inc.

-Appendix A -

RS-232 Serial Interface Operati o n

RS-232C INTERFACING

The use of an embedded microproc essor allows Mydax to offer an RS-232C (remote)
interfacing capability. Mydax systems c an be controlled from a computer with either the
MYDAX REMOTE Window's ™ software package or any control software of the user's choice.
Full control and monitoring is possible, allowing complete s ystem operation from any
convenient location.

Cable connection is via a rear panel DB-25S connector. Connector pin-out is as follows:

Pin 1 Shield
Pin 2 Transmit Data
Pin 3 Receive Data
Pin 7 Common

A typical interconnect cable for an IBM-PC COM port s hould be wired as follows:

IBM-PC MYDAX

DB-25S Female Connector DB-25P Male Connector

1 1
2 2
3 3
4 4
5 5
6 6
7 7

20 20

Appendix A RS-232 Page A-1

Mydax, Inc.

RS-232C COMMANDS

The following ASCII commands can be transmitted to the system MPU via the RS-232C link:

RO Enables RS-232C control.
RF Disables RS-232C control. With remote disabled, system only

responds to RO.

GO Starts the compressor and pump.
HA Stops the compressor and pump.

RP Run Pump only, active only on selected systems.
S?xy.z Sets fluid temperature (x, y and z are any numbers) of tank A,

B or C. Settings outside the range default to the nearest limit.
Entering a decimal point is optional, as the last digit is assumed to be
the tenths digit. For example: "SA180" selects +18.0°C for tank A,
"SA245", "SA24.5" & "SA+24.5" all select +24.5°C for tank A,
"SA93.2" selects +30.0°C for tank A.

TE1 Sends a transmission of abbreviated status including system on/off

status, actual tank temperature and the set point temperature.

TE2 Causes transmission of flow and resistance, if the options exist. For

example:

TE3 Transmits the contents of the 2 by 40-character main display over the

RS-232 line.

TE4 Same output as TE1 plus RTD temperatur es and valve & heater drive

signals.

TR or TR0 Turns off repeat transmission mode.

TRx Enables auto matic periodic repeat transmission (x= 1-60 and

represents the number of seconds between transmissions). The
instructions which follow the TRx command are repeated at the
transmission rate that was set by the TRx command. TE1, TE2, TE3
and TE4 are commands that can be repeated in all or any
combination.

TPx Changes the 2 by 40-character display at the main contro l panel to

Test Panel "x" "0" = normal main display; "1" - "8" = diagnostic
displays. See section on DIAGNOSTIC DISPLAYS. Does NOT cause
transmission of the display over the RS-232C line (see command TE3)

ID Causes transmission of the model number and software revision date.

For example:

Appendix A RS-232 Page A-2

"ID: 1VLH14W 1-24-2000"

Mydax, Inc.

AL Causes transmission of the alarm status. For example:

AH Causes transmission of the alarm history status. For example:

This history is the same as the Test 8 display. The history represents
all alarms that have occurred since the last "Start" command.

CH Clears alarm history. This can also be cleared with the "Start" key or

with the "0" key when viewing Test Panel 8.

A delimiter between command strings can be a carriage return (CR), a semi­colon (;) or a comma (,). I f a command is understood, a (>) is returned for
acknowledgment. If a command is not understood or ignored then a (?) is
returned.

RS-232C STATUS MESSAGES

"ALARM: 0" denotes no alarm condition.

"ALHIS: 13" denotes one alarm.

TE1 status messages include the following:

ON 19.95 20.0 (CR)(LF)
A B C

Key: A) System is ON or OFF

B) Actual Tank Temperature in °C
C) Set point Temperature in °C

A TE4 status message consists of TE1/TE3 data plus RTD temperatures and valve & heater
drives:

ON 19.9 20 -63 -8 41.5 34.5 102 0 2 2 0 4 10 8 2 11 (CR)(LF)

A B C D E F G H I J K L M N O P Q

An alarm status message is transmitted whenever there is an alarm that occurs for the first
time and whenever the alarm status changes:

ALARM: 4 13 (CR)(LF)

R S T

A halt indication is transmitted when the system is stopped for any reason:

STOP: KEY (CR)(LF)

U V

Key: A) System is ON or OFF

B) Actual Tank Temperature in °C, as sensed by the Output RTD

Appendix A RS-232 Page A-3

Mydax, Inc.

C) Set point Temperature in °C
D) Calculated temperature in °C of the refrigerant line at the suction pressure

transducer
E) Pressure in PSIg of the refrigerant line at the suction pressure transducer
F & G) Temperature in °C in the refrigerant line at the Superheat and Condenser

RTDs
H) Temperature in °C in the refriger ant line at the Discharge RTD (2-stage design

only)
I ) Temperature in °C in the refrigerant line at the Subcooler RTD (inactive)
J & K) Valve dr ives of evap orator valves 1 and 2; valve 2 is inactive in single

channel systems (See "DIAGNOSTIC DISPLAYS, Test Panel 1" for explanation of drive
signals.)

L, M & N) Bypass, Superheat, and De superheat valve drives. Desuperheat is no t
available in all designs.

O & P) Heater drive signals; Heater 2 is inactive in single channel systems (See
"DIA GNOSTIC DISPLAYS, Test Panel 1" fo r explanation of driv e signals.)

Q) Flow rate in gallons-per-minute(GPM) of r ecirculation fluid. On systems without a
flow meter, this number has no meaning.

R) Any active alarms, by code # (See the next section for a description of alarm
codes.)

S & T) Actual code # for the alarm
U) Stop is displayed whenever the system is halted
V) Indicates the origin of the Stop Command (status message "S") whether it is

from the system front panel (KEY), the external stop line (EXT.), an RS-232C
command (RS232) or it originated from a fatal alarm (FATAL).

Appendix A RS-232 Page A-4

Mydax, Inc.

RS-232C ALARM CODES

The following alarm codes may be transmitted in an AL or AH status message. Not all of
these codes are possible in every system:

1CONDENSER HOT: The reading from the condenser RTD indicates a

temperature in excess of +50°C. The system microprocessor incrementally
reduces the evaporator valve drive to reduc e the flow of refriger ant into the
evaporator. This effectively reduces the heat-rejecting capacity of the
system, which keeps the temperature in the condenser at acceptable levels.

2 LOW FREON: Indicates pressure of refrigerant is low. Have unit serv iced by

Mydax or a qu alified service center.

3RTD OPEN: Indicates that one of the syste m RTD's has failed and the

system has shut down to protect itself. The main display shows which RTD is
faulty by giving its pin number location on the M1002 or M1005 circuit board.

4PUSH RESET: The interlock loop has been broken and the reset switch must

be depressed to re-establish it.

5 FILL TANK #1: The tank 1 low level sensor has tripped. If coolant is not

added "soon", the "empty" sensor trips and the system shuts down.
6 Inactive in this system.
7 FILL TANK #2: The tank 2 low level sensor has tripped. If coolant is not

added "soon", the "empty" sensor trips and the system shuts down.
8 LOW FLOW: Indicates that a low flow condition exists in one of the

recirculating channels.

9 Inactive.
10 PHASE MISSING: Indicates one or two of the three electrical power phases

is missing. Inactive on single-phase units.
11 PHASE REVERSED: Indicates incorrect electrical power phase relationship.

May be corrected by re versing any 2 phases. Inactive on single-phase units.

12 Inactive in this system.
13 LOW AC LINE: Indicates a low voltage conditio n exists on the input AC line.
14 RESISTANCE LOW: Indicates that the deionized water resistivity has

dropped below the programmed limit.
15 TAN K x TOO HOT / EXTREME TEMP: Indicates that the tank temper ature is

either more than +10.0°C above its upper maximum set point, or too close to

freezing and that the system has shut down.

Appendix A RS-232 Page A-5

This page is intentionally left blank.

sheet 1 of 1 DWG. B2343, Rev 3

Mydax, Inc.

Auburn, CA

1M9W-S Chiller Fluid Schematic

January 25, 2001

Water Cooled

High

Pressure

Switch

Filter
Drier

Condenser

Water Flow
Control
Valve

Capillary Tubes

Drain

Condenser
RTD

Condenser

Cooling Water

1.5 Gpm @ 75°F,
P = 20 Psi

Evaporator

R-22

Compressor

With Suction

Accumulator

Pressure

Relief
Valve
Set at

110 Psi

10 Micron

Particulate

Filter

Pressure
Gauge

Coolant Supply
+15°C to +25°C
10 Gpm @ 100 Psi

Coolant Return

Heat
Exchanger

Evaporator
Valve

Sight
Glass

Refrigerant Liquid

Tank RTD
(Installed Through Side)

Tank
Heaters

Level Switches

Tank
Baffle

10 Gallon
Polypropylene
Reservoir

1 Hp Multi-Stage

Centrifugal Pump

Output
RTD

* Refrigerant control valves
are set continuously by the
system microprocessor.

* All RTD's are read
continuously by the
system microprocessor.

#4,742,689
#4,918,931
#4,934,155

This circuit is covered
by one or more of the
following U.S. Patents:

Receiver

Linear

Pressure

Sensor

HP160

PSIG

3/4"

Copper 90's

1/4" Ball

Valve

1/2"

1"

1"

Power

20A #12 AWG

24VAC / Interlock Loop is
Red #18AWG
Refrig valves are wired in Yellow

High Voltage Wiring Chart:
(All HV wire is Black)

Low-Voltage Wiring Chart:

DC / Logic wiring is
Blue #18 AWG

Power

Evaporator

Reset

69

RL1,C

RL1

A

B

Wh

Red

High

Pressure Switch

Red

CON1

T1

T2

T3

Keyboard

J1

56

56

50

50

23 Reset

M1004 Power Supply,
Phase Detector &
Output Drivers

50 +5V
20 Comp

EV1

3+42

1

SSR1

L3L2L1

Red

M1002 Inputs & RTD's

LCD Display

8

5

RL1,B

J2

J1

J3

RS-232
Connector

J2

M1001 Controller

Power

24 VAC

Out

Gnd In

Gnd

24 VAC

40 VA

CON1

20 Amp

D2402

4

7

RL1,A

L3

L2

L1

Compressor

Crankcase
Heater

Grn

Pump

53

Tank

Empty

Fill

Tank

22 Tank1 Lo

+5V 49

HTR1 23

sheet 1 of 1DWG. B2344, Rev 3

Mydax, Inc.

Auburn, CA

1M9W-S Chiller Electrical Diagram

Water Cooled

January 25, 2001

D2440

23+

1000W

SSR4

14

23+

1000W

D2440

D2440

SSR2

SSR3

1

1

2

4

3+

4

Tank Heaters

1000W

208/230 VAC, 3 phase

Grn

Tank

RT10

Cond. Output

RT3

RT4

RT7

Trim_01

RTD's

1

2

M1007

LED PS

M1010 Interface

Linear

Pressure

Sensor

4
5
6

7

J4

J4

Blue

Gnd

13' of 12/4 Cable with L-15-30 Plug

54

55

EMO

Over Temp

13' of 12/4 Cable with L-15-30 Plug

sheet 1 of 6 DWG. B2240

Mydax Inc.

Auburn, CA.

Mydax Controller M1001

'CPU'

D0

D1

D3
D2

D6

D7

D5
D4

A14

A13

+5V

26

27 28 1 28 26

A0

A1

A8

A4

A11

A12

A10
A9

A7
A6
A5

A3
A2

CE OE

A15 WRN

U22 U16

27C256

EPROM

6264

Read/Write
Memory

20 22 14

20 22 27 14

11

12

13

15

16

17

18

19

10

9

8

7

6

5

4

3

25

24

21

23

2

D4

D5

D7
D6

D2

D3

D1
D0

A0
A1

+5v

1
2
3
4
5
6
7
8

11
9
14
15
16
18

20 19 24

22 23 21 14

RDN

WRN

8254AN

U17

82C54
Counter

Timer

100 Hz

200 KHz

Baud Clock

10

13

17

A12

A13

A14

MREQN

A15

U14

8251N

KEYN

Nov 10, 1997

0.1uf

+5V

ResetN

In4

ResetN

+5V

U21

Max
690

8
7
6
54

3

2

1

2

3

41

1kWaitN

J7

R1

10k

0.1uf8.0MHz

D0

D1

D3
D2

D6

D7

D5
D4

26

27

20

19

22

21

14

15

12

8

7

9

10

29

17

16

13

30

31

32

33

34

35

36

37

38

39

40

1

2

3

4

5

1125

6

24 "CPU"

Z84C0008

U9

M1N

IOREQN

MREQN

WRN

RDN

A0

A1

A3
A2

A6

A7

A5
A4

A8

A9

A11
A10

A14

A15

A13
A12

+5V

8.0 Mhz
Osc. U15

+5V

NMI
J7

Int
J7

10K

10K

1K

1K

U7 U12

1

2

13

12

3

4

8255N

8254BN

CPrQ

11

10

12

13

Qn8ClD

U8

9

+5V

RTC

In3

CPrQ

3

4

2

1

QnClD

U8

5

U7

7

4
5

3

RxRdy

TxRdy

from
sheet 2

4 MHz
to sheet 2

Bat.

Lithium
Battery

U44

9

10

8

74HC138

A

B

C

1

2

3

4

5

6

15

14

13

12

11

10

9

7

sheet 2 of 6

DWG. B2240-2

Mydax Inc.

Auburn, CA.

Mydax Controller M1001

IOREQN

A7

RDN

WRN

U13

U12

A0

A1

A2

A2

A3

A4

IN 1
IN 0

IN 2

IN 3

IN 7
IN 6

IN 4

IN 5

OUT 8
OUT 4
OUT 0

OUT 12

OUT 16

OUT 20

13

12

D1
D0

D2

D3

D7
D6

D4

D5

+5V

Seiko
L4042

LCD
DISPLAY
MODULE

12

4
5
6

14
13
12
11
10

9

8
7

10K 10K10K10K10K 10K

A0

A1

A2

+5V

KEYN

U42

5 ea.
1N914

10K

10K10K10K 10K 10K

KEYN

SIP

D7D6D0 D5D1D0 D2 D3

74HC240

U41

KEY MATRIX
(26 Keys)

11 8 13 6 15 4 17 2

1

19

912714516318

D2
D3
D4
D5
D6

U10

82C51A

A0

PCLR

RDN

WRN

BAUD
CLOCK

8251N

4.0MHz

+5V

26 4
12
21
13
10

8
7
6
5
2
1
28
27

9
25

11 20

Rd

CTS

Td

RTS

U4
MAX232

15
14

3

17

19

23

12

9

11

10 7

14

8

13

RS-232
Interface

0.1uf

0.1uf

Jan. 15, 1996

U31

Out 24

Out 28

RTC

SIP

+5V

VLC

3

10K

LCD R/W

LCD RS

LCD EN

37
38
39
40

1
2
3
4

U11
8255

"A"
Section

D7 27

28

D6
D5

29
30

D4
D3

31
32

D2
D1

33
34

D0

536

RDN

WRN

8255N

67

35 26

ResetN

TxRdy
RxRdy

+5V

+

+

+

+

+

10

10

10

10

10

6

2

16

1

3

4

5

15

J3

11
12
13
14
15

6
5

4

3
2
1

C
B

A

74HC138

to sheet 1

74HC138

A

B

C

1

2

3

4

5

6

15

14

13

12

11

10

9

7

74HC138

A

B

C

1

2

3

4

5

6

15

14

13

12

11

10

9

7

sheet 3 of 6 DWG. B2240-3

Mydax Inc.

Auburn, CA.

Mydax Controller M1001

Input-Output

11
12

13
17

16
15
14

D0

D1

D2

D3

D4

D5

D6

D7

IN 5

U3

74HC244

18

3

16

5

14

7

12

9

19

1

11

8

13

6

15

4

17

2

T2 Low

Interlock

T1 Low

Reset Rly

Freon Lo
Ext Stop

Ext Start

J1-17

J1-18
J1-15

J1-13
J1-14
J1-11
J1-14

J1-16

J1-6

J1-5

J2-4

J2-3

J1-8

J1-7

J1-10

J1-9

T3 Low

Miss Ph.

Rev Ph.

Key Sw.

Remote
Dig/Ana

24
23

22
21

20
19
18

2

17
4

15
6

13
8
11

1

19

9

12

7

14

5

16

3

18

74HC244

U1

10k

+5V

IN 7

D7

D6
D5
D4
D3
D2
D1
D0

2

17
4

15
6

13
8
11

1

19

9

12

7

14

5

16

3

18

74HC244

U2

10k

+5V

IN 6

D7

D6
D5
D4
D3
D2
D1
D0

Res On/Off

On=Remote

On=ext

virtual
On=Volt
Set En.

On=no
Fudge

Baud

Dip Switch

PCLRN

74HC273

U18

9

6
5
2

1

11

3

4

7

8D3
D2
D1
D0

Out 28

April 24, 1996

Switch 2

Switch 3

+5V

10k

100K

+5V
10k

100k

25 10

100k

10k

+5V

U11
82C55
"B

U11
82C55
"C

D4

D5

13

14

15
12

16

19

18

17

D7
D6

LCD R/W
LCD EN
LCD RS

EV1
J2-20

EV2
J2-19

EV3
J2-18

EV4
J2-17

EV5
J2-15

U24
ULN2003A

+5V

9

8

1

2

3

4

5

6

710

11

12

13

14

sheet 4 of 6 DWG. B2240-4

Mydax Inc.

Auburn, CA.

Mydax Controller M1001

Output Dec 20, 1995

U19

74HC273

19
16
15
12

9
6
5
2

111

3

4

7

8

13

14

17

18

PCLRN

Out 8

D0

D1

D2

D3

D4

D5

D6

D7

ULN2003A

9

16

15

14

13

12

11

8

10

7

6

5

4

3

2

1

U16

+5V

Beep

220

220

220

220

+5V

Compr.
J2-13

Pump
J2-16

"Alarm"
J2-14

LED

LED

LED

J8-1

J8-2

J8-6

"Power"

D7
D6
D5
D4
D3
D2
D1
D0

U32

74HC273

19
16
15
12

9
6
5
2

111

3

4

7

8

13

14

17

18

U28

74HC273

19
16
15
12

9
6
5
2

111

3

4

7

8

13

14

17

18

Out 4

+5V +5V

DVB
DVA

High R J4-4
POS R J4-3
DIB J4-6
DIA J4-5

LED

+5V

+15V

Run DVM

DVC

1K
1K
1K
1K

DVM
RDY

+5V+5V

Out 0

14
13
11
6
4
3

9 1

2

5

7

10

12

15

74HC174

U5

14
13
11
6
4
3

9 1

2

5

7

10

12

15

74HC174

U6

D5
D4
D3
D2
D1
D0

1K
1K
1K
1K

RA J1-3

RB J1-4

RC J1-1

RD J1-2

18
17
14
13
8
7
4
3

11

1

2

5

6

9

12

15

16

19

74HC273

U20

PCLRN

Out 12

D0

D1

D2

D3

D4

D5

D6

D7

Spare
J2-6

FAN 3
J2-5

FAN 2
J2-8

FAN 1
J2-7

HTR 3
J2-10

HTR 2
J2-9

HTR 1
J2-12

U26

ULN2003A

9

16

15

14

13

12

11

8

10

7

6

5

4

3

2

1

+5V

sheet 5 of 6

DWG. B2240-5B

Mydax Inc.

Auburn, CA.

Mydax Controller M1001

Analog March 20, 2000

U38

4

5

6

7

12

11

10

9

8

14 13 3

1
16
15

2

10.0K*

10.0K*

RTD Out
J1-24

Set 1
J4-16

Set 2
J4-15

AC Det.
J2-1

T1 Ext.
J4-14

T2 Ext.
J4-12

T3 Ext.
J4-13

U35

DG508CJ

-15V

DVA
DVB
DVC
+5V

D0

D5

D4

D3

D2

D1

D0

D7

D6

D5

D4

D3

D2

D1

+5V

IN 0

IN1

1

20
19
18
17
16
15
14
13
12
11
10
9

40

21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

8
7
6
5
4
3
2

+5V

Run DVM

-15V

U43
79L05

-5V

1 uf+

0.1
uf

200K*

0.1uf
.056uf

200kHz

+1uf

200K*

.0047uf

47

+5V

1uf

+

DVM
RDY

U27

12

U36

ICL7109

74HC14

+15V

3

2

8

1

7

6

5

U38

TL032CP

+10.24V

-10.24V

10.0k

0.1%

10.0K

0.1%

20.0K*

10.0K*

D01413D1

D2

12

11

D3

D4

10

9

D5

D6

8

7

D7

U40

U39

AD7528KN

U40

+5V

A0

Out 16

17
6

16
15
5

418

Ref A

Ref B

1

2

3

7

6

5

3

2

19

20
1

TL032CP

Gain Dac
J1-23
0 to -5.1V

VFan
J2-2
0 to +10.0V

DI Amp
J4-11

40.2K 0.1%

10.0K 0.1%

10.0K 0.1%

40.2K 0.1%

10.0K 0.1%

30.1K 0.1%

10.0K 0.1%

10.0K 0.1%

10K*

10.0K 0.1%

10.0K 0.1%

10.0K 0.1%

30.1K 0.1%

30.1K 0.1%

+15V

+5.12V
J4-8

Test Point A
adjust to +1.024V

Note:

1. Resistors with *
are 1/4W 1% metal film

2

Ref-02CP
U37

6

5

4

"Adj"

20.0K

0.1%

10.0K 0.1%

10.0K 0.1%

10K

10.0K 0.1%

10.0K 0.1%

10.0K 0.1%

20.0K 0.1%20.0K 0.1%10.0K 0.1%

RTD X5

sheet 6 of 6 DWG. B2240-6

Mydax Inc.

Auburn, CA.

Mydax Controller M1001

Optional Jan. 15, 1996

10K

10K

10K

10K

10K

+5V

2K

2K

2K

2K

2K

1K

1K

Ctr1
J5

Ctr0
J5

+5V

0.1uf

13

10

Counter
Timer

82C54

U23

8254BN

WRN

RDN

14212322

241920

18

16

15

14

9

11

8

7

6

5

4

3

2

1

A1

A0

D4

D5

D7
D6

D2

D3

D1
D0

FlwSw3
J5

FlwSw2
J5

FlwSw1
J5

200KHz

U30U30

(optional)

Tank1
J4-9

TL032CP

10.0K 0.1%

20.0K 0.1%

20.0K

0.1%

0.1uf0.1uf
+15V-15V

84

5

6

7

3

2

1

16

1

2

345671110128

9

13

14

15

A1

+5V

++

+10.24V
+5.12V

Pin
Jumpers

EDCBA

Out20

AD7542KN

U29

D3

D2

D1

D0

A0

A0

D0D1D2

D3

U33

AD7542KN

Out24

ABCDE

Pin
Jumpers

+5.12V

+10.24V

++

+5V

A1

15

14
13

9

812101176543

2

1

16

1

2

3

7

6

5

48

-15V +15V

0.1uf 0.1uf

20.0K

0.1%

20.0K 0.1%

10.0K 0.1%

TL032CP

Tank2
J4-7

(optional)

U34 U34

Range A B C D E
+5.12V on - - on ­+10.24V - on - on ­+-5.12V on - on - on
+-10.24V - on on - on

Pin
Jumpers

sheet 1 of 1 DWG. B2242

Mydax Inc.

Auburn, CA.

RTD and Inputs M1002

Dec 28, 1995

100

100

100

100

100

100

100

RT12

RT11

RT10

T3 Evap

T3 Out

T2 Evap

T2 Out

T1 Evap

T1 Out

Condr.

Sup Ht.

Bypass

100

100

Gain DAC
J1-23

5VRTD

120 0.1%

100 0.1%

100K*

1.27K 0.1%

100

+

10K

0.01uf
6

2

U1

-15V +15V

4

3

7

19

S1

S2

20

21

S3

S4

22

23

S5

S6

24

25

S7

S8

26

11

S9

S10

10

9

S11

S12

8

7

S13

S14

6

5

S15

S16

4

A0 A1 A2

A3

17 16 15

14

14

151617

A3

A2A1A0

4

S16
S15

5
6

S14
S13

7
8

S12
S11

9
10

S10
S9

11
26

S8
S7

25
24

S6
S5

23
22

S4
S3

21
20

S2
S1

19

U5
DG506A

U6
DG506A

18
1
27

+15V

+5V

-15V

28

28

-15V

+5V
+15V

27

1

18

100K

100K

100K

100K

100K

100K
100K

100K

RA J1-3
RB J1-4
RC J1-1
RD J1-2

U3

+

+

U2

10K

0.001
uf

1.00K

0.1%

9.09K 0.1%

7

6

5

4

6

7

2

3

4

LT1001

TL032

-15V

-15V

+15V

5.12V
J1-8

+

U2

+15V

5VRTD

10K

10K

1

2

3

8

LT1001

RTD's

0.1uf

+

Bridge

24VAC

24VAC

Ext 4

Stop

Start

Com.

+

U8

U8

U7

PS2501-2

PS2501-2

to
Ana. En.

-28-

to
Stop

-26-

to
Start

-27-

2K

2K

2K

10K

47uf

1N914

6

5

4

3

8

7

1

2

1

2

4

3

7

5

8

6

LT1001

RTD Out
J1-24

0.001
uf

2

3

4

7

6

+15V

U4

+

-15V

12.1K 0.1%

10.0K 0.1%

A
B
C

1. Resistor with *
are 1/4W 1% metal film

PS2501-2

40.2K 0.1%

50.0k 0.1%

100k 0.1%

"Gain"

"Zero"

0.1uf

0.1uf

0.1uf

0.1uf

0.1uf

0.1uf

0.1uf

0.1uf

0.1uf

0.1uf

0.1uf

U3

+

sheet 1 of 2 DWG. B2244

Mydax Inc.

Auburn, CA.

Power Supply M1004

24 VAC

GND

47 volt

Varister

V

1N4002

4700uf
50V

June 19, 1996

Fuse

In

Out

Out

Out

Out

Out

511*47

6
5

30.1K 0.1%

10.0K 0.1%

1.0K*

750*

U4

+

0.1 10uf

+

+15V
100mA

U2
LM317T

+

U4

9.76K*

1.0K*

1.0K*

10.0K 0.1%

10.0K 0.1%

3

2

1

511*

1

0.1

U3
LM317T

+

15.1 2W

2.0K*

+

+5V
200mA

10uf

10uf

-15V
100mA

+

20 1W 1

+

U1
LM337T

0.11000uf

50V

500

2.49K*

249*

Q2004L3

220

6

4

2

1

47

1K 1EV1

Q1

MOC
3032

U6

EV1
J2-20

EV2
J2-19

U7
MOC
3032

Q2

EV2 11K

47

1
2

4

6

220

Q2004L3Q2004L3

220

6

4

2

1

47

1K 1EV3

Q3

MOC
3032

U8

EV3
J2-18

EV4
J2-17

U9
MOC
3032

Q4

EV4 11K

47

1
2

4

6

220

Q2004L3Q2004L3

220

6

4

2

1

47

1K 1EV5

Q5

MOC
3032

U10

EV5
J2-15

Freon Control
Valves

1N4002

ACDet
J2-1

+

+

U5

U5

1

2

3

7

6

5

1uf

1N914

200K*

200K*

4.02K*

511*

10M

LM358A

Power
Connectors

TL032

8

4

+15V

-15V
U18

AL

Run

43 +

45 +

42 -

44 -

1K

1K

PS2501-2

6

5

8

7

1

2

3

4

10K

Q8

2N2222

10K

10K

2N2222

Q7

10K

+5V

20 Comp.

21 Pump

22 Alarm

23 Htr1

24 Htr2

25 Htr3

26 Fan1

27 Fan2

28 Fan3

29 Beep

J2-11

10K

10K

J2-5

J2-8

10K

10K

J2-7

J2-10

10K

10K

J2-9

J2-12

10K

10K

J2-14

J2-16

10K

10K

J2-13

+5V

50 +5V

49 +5V

48 +5V

47 +5V

46 +5V

41 VFAN

+5V

J2-2

0.1uf

sheet 2 of 2 DWG. B2244-2

Mydax Inc.

Auburn, CA.

Phase Detector M1004

April2 4, 1996

Note:

1. Resistors marked with  are
1% 1/4W, all other resistors
are 5% 1/4W.

4

4

8

-15V

+15V

4

8

8

4

+15V

Loop
40

Gnd
39

0.1uf

1M

2

Jumpers

"VAC"220210200190180

1N914 0.1uf

1.58K*

1.50K*

1.43K*

1.33K*

1.27K*

0.1uf

U11

+

6

5

7

7

5

6

+

U14

0.001uf

+5V

1.00M

1.00M 1.00M

0.001uf

1.00M

1.00M

0.001uf0.001uf

1.00M1.00M

1.00M

1.00M

1.00M 1.00M

0.001uf 0.001uf

1.00M

470K

470K

74HC14

+5V

8

Interlock
Loop

Relay

Q1
BS170

1N4002

1K

+5V

"OK"

Green
LED

12

1

13

U16

Miss Ph.
J2-4

Rev Ph.
J2-3

1.0uf

10M 8

96

5

4

3

U17U16

74HC27

11

10

9

8

U16

1K Red

LED

"REV."

+5V

Red
LED

+5V

+5V

"UNBAL"

Red
LED

1K

U17U17

LM358A

LM358A

U17

1.0M

1213

1N914

0.1uf

2

1.0M

0.1uf

1

1N914

LM393A

LM393A

5

4.7K

4.7K

4.7K

10K

470K

1

10K

2

3

+

U14

U12

+

5

6

10K

+5V

7

1

470K

+5V

10K

2

3

+

U12

65

4.7K

3

2

U11

+

1

U13

+

10K*

10K*

7

6

5

3

2

1

10K*

10K*

+

U13

10K*

10K*

74HC74

26

4

3

1

U15

ClPr Qn

Q

D

C

12

11

CDQ

QnPrCl

U15

10

13

1K

"LOWAC"

11 10

U17

"Scale"
Jumpers

X2X1

8.66K*

18.7K*

-15V

L1

L2

L3

Input Range
190-480VAC

0.1uf

0.1uf

sheet 1 of 1 DWG. D2729

Mydax Inc.

Auburn, CA.

M1007 LED Power Supply

Sept 24, 1997

0.1

5.1

1 watt

1000uf

50V

24 VAC

Common

Polyswitch

LM317T

1.0
Positive

Negative

250 mA @4.1 volt

to Display LED backlight

Heat Sinked
In

Out

Ref

1N4002

sheet 1 of 1 DWG. D2616

Mydax Inc.

Auburn, CA.

Interface M1010

Jan 25, 2000

15.0K 0.1%

10.0K 0.1%

+

U3

1

2

3

TL032

4

3

2

1

0.1

10K

Rt

Ct

10uf

U1

LM2907-8

Note:

1. Resistors with *
are 1/4W 1% metal film.

2. For Proteus 500C-high
Ct=0.0047uf, Rt=69.8K*
Rp=50K, 100Hz=0.714V

3. For Proteus 550C
Ct=0.01uf, Rt=49.9K*
Rp=50K, 100Hz=0.97V

4. For Gems 1/2" Lo range,
Rp= 20k, Rt=30.1k, Ct= 0.01uf
100 Hz=0.595 V

Rp

8
7

6
5

1

2

3

Flow In

Common

Shield

+15V

To J4-14 T1 Ext

To J4-12 T2 Ext

8

9

10

Flow Gnd Press.

U2

+10 Ref.

+ Pres.

- Pres.

Common

1.02K *

2

1
8

3

4

5

6

7

-15 V

+15 V

7

4

5

6

INA114

Optional

0.1

0.1

-15 V

1M

10K

Pressure Zero

10.0K 0.1%

J4-11 DI Amp

J6

10.0K 0.1%15.0K 0.1%

+

U3

6

5

TL032

Optional

7

4

8

Alarm

Common

Alarm NC

Alarm NO

Relay

11

12

13

14

200K 0.1%

Optional for

Gems Flowmeters

0.0047 100k

2k

J4-16 Set1

Using Sensym STImV300G1A sensor:
0 psig= 1.125 volt, 300 psig= 8.625 volt

Using Sensym STImV300A1A sensor:
0 psia= 1.125 volt, 300 psia= 8.625 volt
Sea level mean pressure= 14.7 psia = 1.4925 volt

+5V