Table of Contents

Introduction 3

General Description 4

Operator Controls and Display Panel 5 & 6

Dual Button Functions 7

Modes of Operation 7

Modes of Operation Continued 8

Humidity Mode 8

Fan Modes 9

Program Mode 9

Entering Program Mode 10

Programming 10

Program Parameter Table 11

The Up and Down Buttons 12

Exiting the Program Mode 12

Software Identification 12

Programming 14

Ambient Air Water Temperature Differential 15

Program Lock and New Defaults 16

Options and Hardware Configuration 16

Electrical Specifications 17

Figure 3: Typical Application 18

Single Button Functions 19

Dual Button Functions 19

Water Sensor Installation 20

Optional 3 Speed Fan Control 21

High, Medium and Low Fan Speeds 21

Connection Notes 21

Figure 4 Three Speed Fan Application 22


The AH-Passport Control unit is designed for use with Marine Air Hydronics Systems. The system operates on 115 or 230 volt AC power, 50 or 60 Hz. AH-Passport provides optimum control and cabin comfort by incorporating the following features:

Standard Features

- Non-Volatile Memory

- Low Voltage Display Panel

- LED Cabin Temperature Displayed [Fahrenheit or Celsius]

- Face Plate Air Sensor For Accurate Temperature Control

IMPORTANT: Must be Installed Properly

- Programmable Multiple Fan Speed Selections

- User Selected Programs For Optimum Control

- Water In Sensor Allows Individual Cabin Heating

Note: Optional Electric Heater Required.

- Moisture Mode Cycle For Humidity Control

- Conformal Coated PC Boards

High Reliability in Marine Environment

- Dual AC Voltage Input… 115 or 220 VAC

Optional Features

- Outside Air Temperature Sensor

- Electric Heat Chill Chaser Output

- High Output Fan Circuit

- Alternate Air Temperature Sensor

This manual is intended to provide information necessary to insure proper installation and operation of the AH-PASSPORT. Improper installation or misunderstood operating procedures can result in unsatisfactory performance and or premature failure of the controller.

Before Proceeding Read This Manual Completely

If assistance is required prior to or during the installation call Marine Air Systems at 954 973-2477 or send Fax to 954 979-4414.

The AH-PASSPORT is covered under existing Marine Air Systems Warranty Policy. Neglect and system abuse are not covered under the implied or stated warranty policy.

In the interest of product improvement, Marine Air Systems' specifications and design are subject to change without prior notice.

General Description

Temperature Ranges:

Set Point 60 - 85°F 15.5 - 29.4°C

Display Temperature: 0 - 150°F -17.8° to 65.6°C

Air Sensor Temperature 0 - 150°F -17.8° to 65.6°C


Display Panel Width 3.875" X 4.50"

Panel Cut Out Width 3.375" X Height 2.750"

Cable Lengths:

Display Cable Standard 15'


Alternate Air Sensor Standard 7'


Outside Air Sensor Standard 15'

Custom cable lengths available on special request in 5 foot increments. Maximum length of display cable is seventy-five (75) feet. Sensor cable lengths should be limited to 150 feet. The outside air sensor and alternate air sensor are optional items and are not included with the standard control package.

System Inputs

Ambient or Inside Air Temperature

Water Inlet Temperature

Alternate Inside Air Temperature Sensor (Optional)

Outside Air Temperature Sensor (Optional)


AH-PASSPORT has nonvolatile memory which requires no batteries or any form of backup power. When power is lost, the operating parameters are retained indefinitely. When power is restored, the control resumes operating as last programmed. All operating and programming parameters are entered into nonvolatile memory instantly and are retained indefinitely.

Temperature Hysteresis

While in a given mode the controller will maintain a two degrees Fahrenheit (2 °F) temperature variation. A four degree swing is required to cause the unit to shift to the opposite mode. Once in a given mode, heating or cooling, AH-Passport will maintain a two degree hysteresis. The system can be programmed for automatic operation, i.e. heating or cooling on demand, cooling only, or heating only.

Operator Controls and Display Panel

Please refer to figure 1, below, for the button locations and display functions listed on the following pages.

1. POWER BUTTON The power button is used to toggle between the on and off modes. Press and hold the power button while in the off mode to enter the program mode. Press and hold the power button for ten seconds to reset the factory default program parameters. The power and down buttons are used to unlock the program values and allow programming changes while in the programming mode.

2. FAN SPEED BUTTON The fan speed button is used to select one of the six manual or automatic fan speed settings. The automatic fan mode controls fan speed according to the difference between set point and room temperature. The greater the difference, the faster the fan will run unless the system is programmed for reverse fan operation in the heating mode. The fan button is used with the down button to Blank the display for nighttime operation.

3. MANUAL FAN SPEED LED The manual fan speed indicator LED will be lit when a manual fan speed has been selected. The fan speed indicator is also lit when the fan is operated in the circulation mode only.

4. DOWN BUTTON Momentarily press and release the down button and the set point temperature will appear in the display. Press and hold the down button and the set point will begin to decrease, slowly at first, then faster as the button remains depressed. The lowest set point allowed is 60° Fahrenheit which is where the display will stop. The down button is also used in conjunction with the fan button to blank the display making night time operation less obtrusive. The down button is also used to change programmable parameters in the program mode.

5. Up Button Momentarily press the up button and the set point will appear in the temperature display. Press and hold the up button and the set point will increase, slowly at first, then faster as the button remains depressed. The highest set point allowed is 85° F which is where the display will stop no matter how long the button is held down. The up button is also used to change programmable parameters in the program mode.

6. HEAT MODE LED The heat mode LED indicator will be lit when the system is calling for heating and the water valve is open. The heat mode LED is also lit when electric heat is installed and heating is required.

7. THREE DIGIT SEVEN SEGMENT DISPLAY The inside air temperature is displayed in the window whenever the control is turned on. The three digit 7-segment display provides a readout of the inside air temperature as detected by the inside air sensor (located on the face plate unless the alternate air sensor is installed).

The display provides program information, fault codes depending on the mode selected by the user and outside air temperature when the optional outside air temperature sensor is installed.

The three digit display also indicates set point when either the up or down buttons are momentarily pressed.

8. COOL MODE LED The cool mode indicator LED will be lit when cooling is called for and the water valve is open. When cooling only is selected the cool LED turns on and off with the water valve.

When the control resumes operation after a power interruption all the display LEDs will turn on for one second. This is a normal operating condition and is referred to as "Power On Reset".

Dual Button Functions

1. Up & Down Buttons… Off Mode Press the up and down button together and the outside air temperature will be displayed, providing the Optional Outside Air Temperature Sensor has been installed and programmed. See program item (U-8). The outside air temperature can only be viewed when the control is in the off mode.

2. Up & Down Buttons… On Mode Press the up and down buttons simultaneously, while in the on mode, and the convector water inlet temperature will appear in the display. The convector water inlet temperature can only be viewed while the control is in the on mode.

3. Fan & Down Button Press the fan and down buttons simultaneously to blank the display for night time operation. While the display is blanked, the heating or cooling mode LED will remain lit indicating proper system operation. When the control is satisfied the middle segment of the three digit display remains lit indicating the system is operational. Pressing any button returns the display to normal operation.

4. Power & Down Button While in the On Mode, press the power and the down buttons together to enter the moisture control mode. Once in the moisture mode, the display will indicate H U 1. Pressing the power button once returns the control to the off mode.

5. Power & Down Button - Program Mode Press the power and down button after entering the program mode to unlock the programming values and allow program changes. This feature prevents accidental programming changes should someone access the program mode by mistake.

Item Six (6) … While in the Blank Display Mode, the center segment of the temperature display remains " ON " when no heating or cooling is called for indicating the control is operational.

Modes of Operation

Off Mode

When the AH-Passport is in the off mode, all control outputs are turned off. Program parameters and user settings are saved in nonvolatile memory. The program mode can only be accessed from the off mode.

On Mode

When the control is in the On Mode, power will be supplied to the appropriate control outputs and the display will indicate the current state of operation. The operating and program parameters resume based on those stored the last time the unit was operating.

Modes of Operation Continued

Cool Only Mode

When the AH-PASSPORT control is configured for the cooling only mode, the cooling systems will be selected and operated as required. When the temperature drops below the cool set point the system will not automatically switch to the heating mode. The cooling only mode is supplied for installations without the optional chill chaser or where automatic heating selection is not desired.

Heating Mode Only

When the controller is programed for the heating only mode, the heating systems will be selected for operation as required. Should the temperature rise above the heating set point, the system will not automatically switch to the cooling mode. Heating only is supplied for circumstances that require the system not automatically switch to the cooling mode.

Automatic Mode

When AH-PASSPORT is configured for the automatic mode, both heating and cooling will be supplied as required. The heat and cool LED indicators will be lit according to which mode is required. The heat and cool LED follow the valve operation, i.e. on when the valve is on and off when the valve is off. Temperature hysteresis in a given mode will be maintained at two degrees (2° F) Fahrenheit, however, a four degree (4° F) Fahrenheit difference is required to allow mode changes. Once in a new mode, the hysteresis will remain at two degrees (2° F) Fahrenheit.

Humidity Mode

While in the on mode, press the power and the down buttons simultaneously to enter the humidity or moisture control mode. The letters "H U l" will appear in the temperature display indicating successful entry.

Every four (4) hours, the fan is started and air circulated for thirty (30) minutes. During this time the air temperature is sampled and entered into memory. The cooling cycle is started and continues until the temperature is lowered two (2) °F. The system is allowed a maximum of one hour running time to reach the desired temperature. Four (4) hours after the temperature is satisfied or the timer runs out, the cycle is repeated. During the humidity cycle the cool LED is lit while the valve is open.

The humidity mode is provided to maintain a specific temperature and humidity range when the yacht is unoccupied for extended periods of time.

Please Note: The humidity mode can ONLY be entered from the ON mode.

Fan Modes

Automatic Fan Mode

AH-Passport has six automatic fan speeds available. Six represents high, three is medium and one is low fan speed. Press and hold the fan button until the letter A appears in the temperature display window. When the fan LED is off, automatic fan operation has been selected. Automatic fan mode allows AH-Passport to determine the fan speeds based on room temperature. The closer the room temperature is to the set point, the slower the fan will run. This permits a balance between the most efficient temperature control and slower, quieter fan speeds. Automatic fan operation is the factory default mode, however, manual fan speed control is available.

Manual Fan Mode

Press and hold the fan button during normal operation to select one of the six (6) manual fan speeds available. Six (6) is the fastest and one (1) represents the slowest speed. Manual fan mode allows the user to select the desired fan speeds manually. When a manual fan speed has been selected the fan LED will be lit. Manual fan mode is sometimes preferred when room temperature is constantly changing due to varying heat loads.

Circulation Mode

When the system is off at the display panel the fan can be used to only circulate the air. Press and hold the fan button when the display is off until the desired speed number appears in the window. Release the fan button and the fan will run at the selected speed circulating the air without heating or cooling. Press the power button once to cancel the circulation mode and enter the on mode.

High and Low Fan Limits - Fan speeds can be further tailored to suit the user by adjusting the high and low fan limits. See programming modes U 2 and U 3.

Program Mode

Program Mode Overview

The program mode is used to adjust the systems operating parameters to suit the particular needs of individual users. The program mode is also used to tailor the air-conditioning system for most efficient operation within an installation. Installation variables such as ducting, sensor location and system layout effect the perceived operation of the overall system. The program mode allows the system to operate as efficiently as possible within a given installation. AH-PASSPORT is shipped with factory programmable default settings which are stored in permanent memory and can be recalled at any time.

Severe electrical disturbances can sometimes upset the AH-PASSPORT operating sequences. Operator confusion related to program parameters can also cause, what seem to be, operational problems. Whenever there is any doubt as to the proper operation of the controller, Factory Default Parameters should be Re-initialized.

Entering Program Mode

The program mode can only be entered from the off mode. From the off mode, press and hold the power button for five (5) seconds until a "U" appears in the display. Release the power button and the characters "U 1" followed by a parameter setting, appear in the display. AH-PASSPORT is now in the program mode. Exit the program mode to the off mode by pressing and releasing the power button.

NOTE: The control will exit the program mode and return to the off mode if no programming is attempted for one (1) minute.

Restore Factory Default Settings

IMPORTANT ! Factory default settings can re restored by pressing and holding the power button for ten (10) seconds while the control is in the off mode. Five (5) seconds after the power button is pressed, the letter "U" appears in the display window. After ten (10) seconds a software revision number, such as ("A.1O") appears, indicating re-initialization has been completed. Release the power button and the AH-Passport control will return to the off mode with the factory default settings restored.


Using the Program Mode

Increment from one program parameter to the next by pressing the fan button while in the program mode. Press and hold the fan button for a moment, then release the button when the desired parameter appears in the display. Press and hold the fan button to scroll through the program parameters. The programmable parameters range from "U-1" through "U-14" for hydronic air-conditioning systems.

To prevent accidental programming changes the program mode is locked. Once in the program mode both the power and down buttons must be pressed simultaneously to unlock the programming parameters.

Program Parameter Table

There are fourteen (14) programmable parameters with their Factory Default Settings listed in this section. The table below indicates what these parameters are, along with the permitted values and Factory Default Settings.

Important: Should any programming problems or confusion occur, reset the Factory Default Settings by pressing and holding the Power Button, while in the Off Mode, for ten (10) seconds.

The Up and Down Buttons

The up and down buttons are used to select the data or set the desired limits for the parameter being programmed. This method is followed throughout the program mode, however, special instructions are included for individual functions that require them.

Exiting the Program Mode

There are two methods to exit the program mode. Press the power button and the AH-PASSPORT control will return to the off mode. Not pressing any buttons or attempting any program changes for sixty (60) seconds will cause the control to exit the program mode to the off mode. Any programming changes that were made while in the program mode will be memorized and put into operation when the mode is exited and the control returned to the on mode.

Software Identification

The software version of the control is identified for one (1) second prior to the exit from the program mode. The software identification number, i.e. ("A.1O") will appear in the display for one second, then the control will return to the off mode.

Should there be any reason to contact Marine Air Systems about the system or programming the AH-PASSPORT, be sure to have the software identification number available.

Button Functions are Not instantaneous as in pressing keys of a typewriter. When using the control press and hold the button for an instant before releasing. Follow specific button instructions closely, where such instructions are given.

U-1: Operating Mode

The operating mode is used to select heating only, cooling only or automatic mode depending on the particular requirement. Zero (0) selects the automatic mode, one (1) selects cooling only and two (2) selects heating only. Example: Systems that do not have heating capabilities should be programmed for cooling only. The factory default is zero (0)… automatic heating or cooling mode.

U-2: High Fan Limit

The upper fan speed limit can be tailored to suit various motors and operating conditions. The high fan limit is adjusted with the system installed and operational. The range of values are 56 through 85 and represent arbitrary units. Setting a higher number, results in a higher fan speed, setting lower numbers, lowers the high fan speed limit. Use the up and down buttons to select the desired high fan speed limit. The factory default setting is eighty-five (85).

U-3: Low Fan Limit

The low fan limit determines the lowest output allowed for the low fan speed. The range of values for the low fan speed limit are 30 through 55, in arbitrary units. The factory default setting is 45.

NOTE ! Both the high and low fan limits may be adjusted while the fan is operational. From the off mode, start the fan by pressing and holding the fan button. Continue to hold the button until one (1) appears in the display. This is the fan circulation mode only, fan speed one (1). Enter the program mode while the fan is running and select "U-3" which is the low fan limit adjustment. Raising and lowering the low fan limit allows the programmer to experience the fan speed changes as they are made.

Adjustment of the high fan limit while the fan is operating is accomplished the same way, except "U - 2" is be selected instead of "U-3".

IMPORTANT ! Once the high and low fan speed limits are set, the unit will automatically readjust the remaining fan speeds to produce six (6) equally spaced speeds.

U-4: Reserved for Future Options

Program items U-4 and U-6 have been skipped because these memory locations have been reserved for future options.

U-5: Temperature Calibration

Use this feature to calibrate the air sensor within a range of ± ten (10) °F. Enter the program mode and the offset will be displayed. Use the up and down keys to select the desired offset. The factory default is zero.

U-6: Reserved for Future Options

U-7: Fahrenheit or Celsius Selection

The unit can be programmed to display either Fahrenheit or Celsius. Programming zero (0) selects degrees Fahrenheit and selecting one (1) displays degrees Celsius. … the factory default setting is zero (0) degrees Fahrenheit. When degrees Celsius (°C) is selected, the readings are displayed in tenths, i.e. 22.2° Celsius represents room temperature.

U-8: Outside Air Sensor Option

Jack J-2 can be assigned to read an optional outside air temperature sensor, providing the system does not require an alternate air sensor. Select 1 and install the outside sensor in jack J-2. View the outside temperature by pressing both the up and down buttons while in the off mode. Selecting 0 allows jack J-2 to be used as an alternate air sensor should the face plate sensor be located in an unfavorable location.


U-9: Reverse Fan Speeds During Heating

During normal operation, in both the heating and cooling modes, the automatic fan speeds are reduced as the set point is approached. During heating, this is not always the preferred method of operation. Some customers prefer that the fan run faster as the set point is approached. Lower fan speeds at cooler temperatures make the air seem warmer. Program one (1) if you wish to reverse fan speeds during heating… The factory default setting is one (1), reversed fan operation.

U-10: Cycle Fan with Demand

The fan can be programmed to run continuously when the system is on or can be allowed to cycle with the heating or cooling demand. When cycled on demand the fan will only operate when heating or cooling is called for. To cycle the fan with the water valve program zero (0). To operate the fan continuously, select one (1). The factory default is one (1) which allows continuous fan operation while the system is on.

U-11: Chill Chaser Option

Units may be equipped with chill chasers or in line electric duct heaters. Chill chasers are used when the hydronic system is supplying cooling and a particular cabin requires heating. The chill chasers are also used to supplement hydronic heating when necessary. Program one (1) to select the electric heat chill chaser option. The factory default is zero (0) which selects hydronic heating and cooling only.

Important: Please note that option U-11 has to be turned on to allow electric heat or chill chaser operation.

U-12: Fan Motor Selection

There are two basic fan motor types, shaded pole and split capacitor. Each motor reacts differently to speed control and each motor requires different timing for optimum speed control. The default setting is zero (0) which selects split capacitor, however, one (1) should be selected if a shaded pole fan motor is used in the system.

U-13: Hydronic Valve Forced Open

This feature allows service personnel to force the hydronic valve open to facilitate bleeding air from the system. Selecting 1, will force the valve open for 4 hours while normal cooling and heating is maintained. The valve can be returned to normal operation, anytime during the cycle, by selecting zero .

Ambient Air Water Temperature Differential

U-14: Ambient to Water Temperature Differential

The difference between ambient air temperature and hydronic water temperature is used to control water valve opening and closing. The programmable range is five (5° F) through twenty-five (25° F) degrees Fahrenheit. Selecting ten (10° F) opens the valve when water temperature is ten degrees less than ambient in cooling mode and greater than five degrees (5° F) in the heating mode. Figure two (2), shown below, illustrates the relationship between ambient air and hydronic water temperature using the factory default values.

Careful selection of the temperature differential can fully utilize the ships heating and cooling resources. For example, while in the cooling mode and using a ten degree value, the valve will open to allow some cooling while the hydronic system is coming down to temperature… The programmable range is 5 to 25° Fahrenheit and the Default Setting is 15° F.

When equipped with an optional electric heater, the heater will overlap with the hydronic heat by twenty-two degrees Fahrenheit ( 22° F). The heater will turn on when heat is required and remain on until the hydronic water temperature exceeds the ambient by twenty-two degrees Fahrenheit or until the room temperature is satisfied.

The electric heat is allowed to overlap the hydronic heat to supplement the main heating system during very cold conditions.

Program Lock and New Defaults

Program Lock

The systems program parameters cannot be altered without first unlocking the program mode. Defeat the program lock by simultaneously pressing and releasing the power and down buttons after entering the program mode. The program lock is provided to prevent accidental parameter value changes by someone unknowingly stumbling into the program mode.

New Defaults

Once the desired programming changes have been made and the system tests satisfactorily, your work can be saved as the new factory defaults. Your new defaults are initiated by simultaneously pressing and holding the up and down buttons for 3 seconds prior to exiting the program mode. New defaults can be initialized at any time by entering the program mode and following the above instructions.

Once new defaults have been initialized the control will revert back to the new defaults whenever factory defaults are restored as described on pages 8 and 10 of this manual.

Options and Hardware Configuration

Several features are both hardware and software configured. The optional item is plugged into the board, the appropriate jumper selected, the program parameter set and the system recognizes the option on power-up.

Alternate Air Sensor Input

Provisions are made for an alternate air sensor should installation restrictions not allow the use of the standard face plate air sensor. Install the alternate air sensor cable in the appropriately marked jack located on the module board and fasten the sensor in the return air stream. The control will automatically recognize the alternate air sensor and no programming is required.

Outside Air Sensor Option

When this option is installed, the outside air sensor is plugged into the alternate air sensor jack and the U-8 program value set to one (1). The outside air temperature can be viewed during while in the Off Mode by pressing and holding the up and down buttons simultaneously. AH-Passport boards manufactured after May of 1996 include the outside air sensor jack.


The primary function of Jack J-2 is to provide input for the alternate air sensor, therefore, the outside air sensor is not available when an alternate air sensor is required.

System Configuration

Jumper JMP-4 controls the basic system configuration… Chiller control or direct expansion control. When the passport module is used as a convector control, JMP-4 must be cut.

Fan Operation with Optional Electric Heat

The fan will continue to operate for three (3) minutes after the system is shut down when an electric heating cycle has been called for. This occurs if the fan is programmed to cycle on demand ( U-10 = 0 ) and the cycle is stopped short by changing the set point or turning the unit off with the power button.

Electrical Specifications

Set Point Range 60°F to 85°F

Temperature Range Displayed O°F to 150°F

Sensor Accuracy ±2°F at 77°F

Low Voltage Limit 115 volt units 75 VAC

Low Voltage Limit 220 volt units 175 VAC

Low Voltage Processor Reset 60VAC

Line Voltage 115 thru 240 VAC

Hertz 50 or 60 Hz

Fan Output 6 Amps at 220 VAC

Maximum Number of Fans Connected Two

Valve Output 6 Amps at 220 VAC

Heater Output 20 Amps at 220 VAC

Minimum Operating Temperature 0°F

Maximum Operating Temperature 180°F

Module Power Consumption Less Than 5 Watts

Figure 3: Typical Application

AH-Passport Button Functions

Single Button Functions

Power Button

1 - Turn the system on and off and enter the program mode.

2 - Exit the program mode

Fan Button

3 - Select automatic or manual fan operation and select manual speed.

4 - Advance to the next parameter in the program mode.

5 - Hold down to view the service history while the control is resetting.

Up Button

6 - View the set point and raise the set point.

7 - Advance data values in the program mode.


Down Button

9 - View the set point and lower the set point.

10 - Reduce data values in the program mode.

11 - Move back through the service log.

Dual Button Functions

Up and Down Buttons

13 - View the outside air temperature.

14 - Save new defaults when exiting the program mode.

Power and Down Buttons

15 - Enter the humidity mode while the control is in the on mode.

16 - Unlock the program parameters while in the program mode.

Fan and Down Buttons

17 - Blank the display during night time operation.

Water Sensor Installation

Sensor Location

The Sensor should be located as close to the water valve as possible and securely mounted with stainless steel clamps. The sensor housing is brass providing compatibility with copper tubing used in the water system. The standard wire length is seven (7) feet, however, custom lengths are available on request. Maximum safe length for the water sensor cable is one-hundred (100) feet.

Proper operation of the water valve requires data from the Water In Sensor — the system cannot operate properly without Water -In Data! The sensor must be installed on the water inlet pipe.

Optional 3 Speed Fan Control

AH-Passport can be configured to operate 3 speed blower motors. The purpose of this option is to reduce fan motor noise during 50 Hz operation. The standard fan triac circuit causes excessive motor noise when operated at 50 Hz.

The option board is plugged into the main board and the 3 speed fan motor is wired according to the application diagram shown on page 20 of this manual.

The 3 speed option board is automatically recognized on power-up and no special programming is required.

The standard fan output triac remains functional and can be used in conjunction with the 3 speed option board. Motors that do not have 3 speed windings will have to be connected to the standard fan output as shown on page 16 of this manual. No motor noise reduction can be expected when using the standard fan connection

High Medium and Low Fan Speeds

The AH-Passport standard fan output connection provides 6 fan speeds. One [1] being the lowest speed and six [6] represents high speed.

The fan speeds are selected automatically according to temperature differential or manually according to user preference.

Automatic or manual fan speeds 5 and 6 will maintain high fan speed output from the option board.

Fan speeds 4 and 3 will output medium fan speed from the option board.

Fan speeds 2 and 1 will output low fan speed from the option board.

Connection Notes

The 3 output relays are rated for 7 amps at 230 volts AC continuous.

Fan L-2 is connected to the fan L-2 terminal on the mainboard.

The AC line [L-1] is connected to L-1 on the main board.

Care must be taken to connect the correct motor speed tap to the appropriate connection on the 3 speed option board.

Figure 4 Three Speed Fan Application

No part of this publication may be reproduced, translated, stored in a retrieval system, or transmitted on any form or by means electronic, mechanical, photocopying, recording or otherwise without prior written consent by Micro Air Corporation.

Every precaution has been taken in the preparation of this manual to insure its accuracy. However, Micro Air Corporation assumes no responsibility for errors and omissions. Neither is any liability assumed for damages resulting from the use of this product and the information contained herein.