Heavy Fog Glaciator X-Stream
Contents
1. USER GUIDE VERSION 1 0 Heavy Fog Glaciator 4 em al A S Olof Palmes All 18 DK 8200 Aarhus N e 45 87 40 00 00 Internet www martin dk J A Phon Martin Profession HEAVY FOG GLACIATOR Fluids Suitable for this system ENN Heavy Fog Fluid B2 v Jem NOTE The warranty on this machine is conditional on the use of genuine JEM Martin fluid only Other fluids may represent a health hazard when used in this machine and may damage the internal components L EON Heavy Fog Fluid C3 v Jem HEAVY FOG GLACIATOR CONNECTIONS REMOTE 1 GND 2 12V OUT 3 INPUT 1 6 z 1 FOG 7 3 2 STANDBY 8 REMOTE PUMP m 3 TIMER 9 REMOTE PUMP T 4 FAN O 5 LOW FLUID m 6 GND 5 9 lt oN J O O1 BR N oo 10 SPECIAL 1 11 SPECIAL 2 12 SPECIAL 3 ssaydav XWA 1 GND 2 COLD 3 HOT LAdNI vivd xwa NI OO FUSE RATINGS The Heavy Fog Glaciator uses six fuses They should be replaced with the value and type detailed below DMX receiver low voltage 2AT Power PCB 15AT Compressor control relay 3 15AT Local Remote relay 3 15AT Condenser fan relay 3 15AT External pump signal 1AT These fuses are located internally and should not be accessed without first disconnecting the power supply FILTERS The Heavy Fog Glaciator uses a washable synthetic fibre filt2. DMX console being used to control the system Setting of the base address of the DMX control system via the Dip switch requires the decimal address to be converted to a binary base 2 number Many pocket calculators can perform this conversion or the user can read off the settings from a printed conversion table An alternative is to use a simple process of subtracting the largest of the binary weightings that leave a positive result Example Decimal 289 Largest subtraction possible is 256 leaving 33 Now 33 32 1 and 1 1 0 So we need a binary representation with 1 s in the positions corresponding to weightings of 1 32 256 Or 100100001 where 256 is the leading column The weighting on the Dip switch is reversed so the number 100001001 is entered from left to right The binary weightings on the Dip switch read as folows from left to right 1 2 4 8 16 32 64 128 256 The remaining 3 switches are marked S1 2 3 and are function switches that enable special operating modes on the machine HEAVY FOG GLACIATOR USER GUIDE THE DISPLAY Two LED displays are used in the Heavy Fog Glaciator to show status and control information The left display shows all information for the fog generation functions of the machine whilst the right display shows the information for the Ice functions Located below each display are 4 function keys that can be used to control the display and the settings on the machine The functio
3. indicating that the machine can not be fired and the heaters are OFF Fog Err Shows that the Standby switch is ON but the heater is not on This is an error condition and should not normally occur Fog Ht Displayed when the heater is running but the machine is not ready Fog rdy The machine is ready to fire using the Fog or Timer switches FLu Lo Indicates that the fluid in the container is below the minimum level to operate the machine Only visible when the machine has reached the ready state Fog 08 The FOG switch is being used to fire the machine The number displayed is the current Fog output level in the range 0 to 20 Ice Display dEn oFF Displayed when the Standby switch is set to OFF dEn nor Shows the current Density setting 18 HEAVY FOG GLACIATOR USER GUIDE SAFETY GUIDELINES Always use JEM Martin approved fluid in the container supplied with the machine Do not bypass the fluid sensor this could cause damage to the machine Check the voltage is correct for use with the machine the voltage setting is printed on the serial label The machine must be operated in a horizontal position and should not be suspended overhead Observe the warnings displayed on the machine yellow labels Do not remove the covers or attempt to repair a faulty machine an autho rized JEM dealer should be contacted in the event of a faulty machine Always use smoke machines in well ventilated areas over use could affect sufferers o
4. down a 6 second run on time for the evaporator fan can be selected Remember that the density setting for ducting is Lo since this gives the greatest fan speed for any given fog output level The evaporator fan may run at other times to assist in the control of the refrigeration system CONDENSER TEMPERATURE CONTROL The radial blowers used to cool the condenser unit are powered from a 2 speed relay which is controlled by the machine s microprocessor The speed of the fans is determined by the temperature of the condenser unit and the thermal load on the evaporator The control software uses a timer to prevent short cycling of the speed controller Under almost all ambient conditions the fans should run at low speed when the machine is idling but when fired the system will switch to high speed The high speed running will continue after the end of the current firing cycle and is timed according to the temperature of the condenser unit The filter material fitted to the condenser unit can be changed by removing the four screws securing the condenser top cover The guidelines for filter change cleaning are Normal conditions Inspect and clean replace every 250 hours Severe conditions Inspect and clean replace every 150 hours 13 HEAVY FOG GLACIATOR USER GUIDE REFRIGERATION SYSTEM CONTROL The performance of the refrigeration system in the Heavy Fog Glaciator is the key to its heavy fog generating capability The s
5. the machine is being started from cold Starting with all the control panel switches OFF and the display showing OFF go through the following sequence Set the Standby switch to ON Fog display shows FOG Ht Ice display shows Den nor Set the output to Fog 8 Set the Ice switch to ON When the machine is ready after approx 10 minutes heat up time fog can be produced Fog display shows FOG Rdy Ice display shows Den nor If starting the machine for the first time or after the fluid has been changed the pump may need to be primed Do this by setting the Fog output to 20 and firing the machine for 10 seconds or until fog is produced at the output If the pumps have not primed after 40 seconds there may be a problem with the fluid system Refer to the Fault Finding section of the handbook for advice The unit may not prime properly if the ice system is not at 15 or below This can be overcome by switching the ICE switch to off and then priming the pump as previously described Set the Fog switch to ON to produce continuous output of Heavy Fog Fog display shows FOG 08 Ice display shows Den nor Set the Timer switch to ON to produce timed output read the Timer section to see how to configure the timer Note that the Fog switch overrides the timer switch Fog display shows ton 04 toff 03 etc Ice display shows Den nor 16 HEAVY FOG GLACIATOR USER GUIDE COMMISSIONING THE MACHINE Unpack the machine and look for
6. annel 2 Compressor switching and Density setting 0 32 Compressor off 33 65 Low Lo density 66 98 Normal Nor density 99 High Hi density The system implements true proportional control of the fog output rather than the simple switching functions found on other equipment The output levels of FOG and FAN are linked during DMX operation via the Density setting The DMX base address can be set to any channel in the range 1 511 using the DIP switches The channel number must first be decoded into binary format before being set into the switches HEAVY FOG GLACIATOR USER GUIDE ICE Setting this switch to ON will start the compressor There will always be a delay of up to 20 seconds to allow pressure equalisation This function is independent of the status of the STANDBY switch THE TIMER The timer system is implemented in software using the machine s main control PCB As such the timing is crystal controlled and will be of good accuracy when compared to the usual analogue timers commonly found on fog machines The timer is enabled by setting the Timer switch on the control panel to ON Pressing the Timer switch will cause the timer to start from the beginning of the ON period and run through to the end of the OFF period the cycle will then repeat until the Timer switch is set to OFF The timer will only function when the Standby switch is set to ON and the machine is ready RdY Switching the Timer to OFF at any time d
7. any obvious signs of damage Place the machine on a level surface and fit a container of JEM Martin approved fluid into the fluid compartment Fit the fluid line and cap to the container Check the wiring instructions in the Safety Guidelines section of this handbook and connect the machine to the power supply Set the power switch to the ON position and look for the start up message on the displays Set all the switches on the control panel to OFF and refer to the Basic Operation section of this handbook for information on how to use the main functions of the machine Read the Safety Guidelines before using the machine REMOTE CONTROL OPTIONS The Heavy Fog Glaciator provides the user with 3 ways to implement a remote control on the machine The main control panel is fixed and can not be removed for remote operation All the remote interfaces are located on the panel adjacent to the control panel The options are DMX 512 Digital Interface The interface uses the two XLR 3 connectors marked DMX on the interface panel and uses the usual DMX electrical standards RS 485 The inputs are protected against overvoltage and an ouput connector is provided to allow multidrop operation of the link Remote Interface The remote interface uses an XLR 3 connector to allow a standard JEM remote to fire the machine Full proportional control of the Fog output can be achieved but the Density level must be set on the control panel PLC Inte
8. ducting POWER REQUIREMENTS dependant on model Input voltage 230V 50Hz single phase 32A supply Input power max 4 893KW 230V Current max 22 2A Input voltage 208V 60Hz single phase 32A supply Input power max 4 325KW 208V Current max 21 9A Power connection is via 32A 3 pin IEC appliance inlet 230V machines or fixed cable 208V machines 20 HEAVY FOG GLACIATOR USER GUIDE USER GUIDE CONTENTS Introduction 2 Features 2 Safety Guidelines 3 Machine Layout 4 Commissioning The Machine 5 Remote Control Options 5 DMX Operation 6 The Display 8 The Fluid System 10 Local Remote Fluid System 11 Refrigeration System Control 12 Evaporator Fan Control 13 Condenser Temperature Control 13 Control Panel Functions 14 The Timer 15 Basic Operation 16 Interface Options For Glaciator X stream 17 Display Messages 18 Basic Fault Finding 19 Specification 20 Connections 21 Fuse Ratings 21 Filter Maintenance 21 2003 Martin Professional A S Denmark All rights reserved No part of this manual may be reproduced in any form or by any means without permission in writing from Martin Professional A S Denmark HEAVY FOG GLACIATOR USER GUIDE INTRODUCTION The Heavy Fog Glaciator X Stream is the latest product in the new generation range of JEM professional machines Designed for touring and installation in a variety of applications it has provision for easy integration into most common control systems currently used i
9. em can shut the machine down by using pin 5 of the interface connector 9 way D type This allows a remote system to be constructed which includes a fluid sensor thus preventing the system from running dry The input on pin 5 must be pulled low relative to the ground on pin 6 Ground isolation should be provided between the two systems by using relays or opto isolators The remote fluid connection is a 6mm push fit style pneumatic fitting and should be used with nylon or PTFE tubing having a 10 bar pressure rating When using a remote slave pump the suction line must be fitted with a suitable filter such as Martin part number 26480020 The most suitable type of pump is a diaphragm unit similar to FloJet style 2100 which includes a pressure switch To prevent the liquid being forced through the internal pumps the maximum pressure in the feed line to the machine should be 3 bar 44psi For distances to the reservoir of less than 6m a slave pump is not required To prime the pumping system the Ice switch should be set to OFF to allow the machine to run the pumps at maximum output Alternatively wait until the refrigeration system cools to below 10 at which point the pump ramping system will become inactive and maximum output will be available Note All pressures are quoted as gauge pressure 11
10. er in the air intake for the condenser unit located at the top of the machine This can be removed for cleaning by removing the ventilation grill above it four M5 screws Use the following guidelines for when to check the filter Normal Conditions Inspect and clean replace every 250 hours Severe Conditions Inspect and clean replace every 150 hours 21 HEAVY FOG GLACIATOR ree SPECIFICATION HEAT EXCHANGER 3 5KW heater 240V Wide bore steel vaporizing coil Ceramic thermal trip for over temperature protection Electronic Temperature control using thermocouple FLUID SYSTEM Oscillating piston high pressure fluid pump Low fluid detection by electronic sensor 5L fluid container 1 3 US Gal Maximum fluid consumption 120mL minute REMOTE CONTROL OPTIONS DMX512 decoder Required Channels 2 Output is proportional for all levels above 12 Channels supported 1 to 511 Valid start codes 0 dimmer data only Full framing error detection implemented Analogue control via standard JEM Multifunction Contoller PLC interface for simple switching control of the system CONTROL PANEL 2 x LED displays with 4 button keypad Output level control from 0 to 100 for Fog Timer range Delay time toF 0 seconds 90 seconds Run time ton 0 seconds 90 seconds REFRIGERATION UNIT 1 HP compressor with PWM electronic control Uses refrigerant R404A 1 2 Kg OUTPUT CONNECTION Ducting adaptor to accept 150mm 6 flexible
11. f asthma or other chest conditions Smoke machines can cause condensation to form Floors and surfaces may become slippery and should be checked regularly This machine is not waterproof and should not be exposed to wet outdoor conditions Do not spill fluid over the machine If fluid is spilt clean with a damp cloth and contact an approved JEM dealer for advice Refer servicing to qualified service personnel Disconnect the machine from the power supply before removing any covers Mains Cable Wiring Instructions The Heavy Fog Glaciator is fitted with an IEC 32A single phase connector A suitable 32A 230V supply must be This equipment used must be earthed On the 208V 60Hz version of the machine the IEC connector is replaced by a fixed cable To connect to US 208V supplies the Brown Live neutral conductor can be connected Blue Neutral to the second phase of the 120V Green Yellow Earth system while phase 1 is connected to the Live conductor HEAVY FOG GLACIATOR USER GUIDE MACHINE LAYOUT CONDENSER AIR INLET WITH FILTER CONTROL PANEL POWER SWITCH AIR INLET INTERNAL FLUID y DRIP TRAY COMPARTMENT WITH LOCAL REMOTE POWER INLET SELECTION SWITCH EXTERNAL FLUID INLET HEAVY FOG GLACIATOR USER GUIDE INTERFACE OPTIONS FOR GLACIATOR X STREAM The PLC interface connector is now fully operational on all model
12. iods there will always be a build up of condensation in the evaporator unit This will drain into the drip tray which should be emptied regularly For installation an optional drain hose can be fitted 10 HEAVY FOG GLACIATOR USER GUIDE LOCAL REMOTE FLUID SYSTEM The Local Remote fluid system used on the Glaciator gives users the flexibility of using either the built in 5L container with sensor or a remote supply The remote supply can be up to 100m away from the machine if a suitable slave pump is used at the reservoir An output which is active when the machine is firing is provided on the 9 way D type connector pins 8 amp 9 This signal can be combined with the signal from a pressure switch to control the remote pump which must have a maximum output pressure of 3 bar These contacts are voltage free and allow the remote pump to be active only when the machine is fired Since the contacts are voltage free they can be connected in parallel with the signals from other Glaciators which share the same fluid supply This forms a wired or function which enables the pump when any all machines are operated The output must not be used to control mains line net voltages directly To select between local or remote fluid open the door of the fluid compartment and operate the toggle switch mounted in the top of the compartment side panel The local fluid sensor will be disabled when in remote mode but the remote syst
13. menus available on each display and the functions they perform are as follows Fog Display Fog Sets the current Fog output level in the range 0 to 20 Ton Sets the ON time of the Timer in the range 0 to 90 seconds ToF Sets the OFF time of the Timer in the range 0 to 90 seconds Ice Display Den Sets the output density level Lo Nor Hi SuP Sets the supply voltage in the range 200 to 250v Ice Displays current system temperatures The software that controls the displays and the other functions of the machine is stored in Flash memory on the DMX receiver PCB As new features become available this program code can be updated by using the Martin Uploader programming device for the AVR microprocessor HEAVY FOG GLACIATOR USER GUIDE THE FLUID SYSTEM The Heavy Fog Glaciator uses a 5L 1 3 US Gal container to give approximately 1 5 hours of continuous operation at full output This will vary with power supply voltage which will determine the maximum continuous output level For longer run times the remote fluid system can be used The machine control system uses a Pump Ramping technique to allow continuous operation with moderate input power requirements When the output level is set to maximum the machine will give maximum output until the heat exchanger has used its energy reserves The control system will then override the output level setting and reduce the pump speed to match the output to the available inpu
14. n the entertainment industry As well as providing remote control options via DMX the machine comes with a comprehensive control panel for local operation and display of operating parameters The Heavy Fog effect is provided by cooling the smoke output from the main heat exchanger until it is at a temperature lower than the ambient in which the machine is operating Air is added to the smoke prior to cooling from the fan mounted in the rear of the machine This increases the volume of the effect and allows the output to be pushed through ducting A fluid container with 5L capacity 1 3US Gal is provided for Heavy Fog fluid To allow reliable unattended operation the fluid level is monitored electronically and the machine shut down if necessary All machines come with robust carrying handles and heavy duty braked castors A ducting adaptor as an accessory FEATURES Tubeless condenser Electronic low fluid detection 5L fluid capacity Remote fluid High pressure piston pump Pump Ramping system for continuous operation LED displays for FOG and ICE controls Electronic expansion valve Fog and Density controls for easy set up 3 5KW heat exchanger Accurate timer DMX512 interface two channel Remote interface Integrated PLC interface Two speed condenser fans Non volatile memory for user for reduced noise settings 2 HEAVY FOG GLACIATOR USER BASIC FAULT FINDING The Heavy Fog Glaciator is a complex machine and will requi
15. ns of the keys are shown in the following drawing MENU ENTER UPKEY DOWN KEY KEY KEY The message displayed will depend on the operating mode of the machine at the time However pressing the menu key at any time will cause the display to go into the edit mode allowing the operating parameters to be adjusted After approximately 15 seconds since the last keystroke the display will leave the edit mode and revert to displaying the current status information Pressing the menu key will display the current menu function whilst pressing and holding will scroll through the available menus All keys work the same way and can be operated with single keystrokes or held down to force the display to scroll through the available options values The scrolling function comes into operation 1 second after the key is pressed When the user has set the required menu function pressing the enter key will display the current value associated with that menu item The user can now use the UP DOWN keys to move through the available options values either by single keystrokes or by scrolling HEAVY FOG GLACIATOR USER GUIDE EVAPORATOR FAN CONTROL When the current firing cycle is over the evaporator fan will run at maximum speed for 3 seconds to clear the remaining smoke from the evaporator compartment To allow for machines with ducting on the output a special extended run mode can be selected By setting the special function switch 1 s1 to ON
16. ollowing drawing J L 8 FOG STANDBY The switches are used to set the operating mode of the machine and are used individually or in combination The functions available are explained below FOG Gives Fog output at the level currently set using the display system The machine must be Ready before fog can be produced STANDBY The standby switch brings the machine into operating mode and will start the heater This switch must be ON to use the Fog switch or the Timer When Standby is OFF the machine will display OFF on both displays With standby ON and the machine ready Rdy will be on the Fog display TIMER When the machine is Ready at operating temperature the timer switch will start the timer running using the settings from the display 14 HEAVY FOG GLACIATOR USER GUIDE The machine uses a pump ramping technique to allow continuous operation This means that transmitting DMX 100 will cause the machine to run at full output until the temperature falls and the output is automatically reduced The output will remain at this level until the DMX signal is reduced or the fluid is exhausted There is no possibility of damage since the electronic fluid level sensor will shut the machine down The fan output level is affected by the ramping system via the Density setting The onboard timer functions are not accessable via the DMX system Any timing of the output must be done using the programming capabilities of the
17. re a competent service technician to repair any major faults However the following guide will allow the user to overcome the more common problems GUIDE SYMPTOM CAUSE CURE No fog output when the machine is fired using the Fog or Timer switch Machine is not ready Allow time to reheat Fluid is below min level Add fluid Standby switch is OFF Set standby to ON No fog output when using DMX to fire the machine Incorrect DMX address Check settings Machine not ready Allow time with DMX on No DMX termination Fit 120 ohm resistor Flu Lo is displayed on the Fog display Fluid level is below min Add more fluid Machine is not ready after 20 minutes heating time Standby switch is OFF Set Standby ON Blown fuse on Power control PCB Disconnect supply and replace fuse Fog disperses too quickly Wrong grade of fluid used for the application Choose a longer lasting fluid see front cover Density level too low Increase density setting Reduces fan speed 19 HEAVY FOG GLACIATOR USER GUIDE DISPLAY MESSAGES The following list shows the messages possible and the context under which they are displayed Only the messages available under normal operation are shown Messages shown when using the menus are detailed in other sections of this handbook Fog Display Fog oFF Displayed when the Standby switch is set to OFF
18. rface This connection is an option available to installers who wish to control the machine using the ouputs from a standard Programable Logic Controller PLC The interface allows voltage free control signals to switch the Fog Standby Timer and Ice functions The output levels and timer settings must be made using the control panel See the section called Interface Options for more information HEAVY FOG GLACIATOR USER GUIDE DMX OPERATION The machine may be operated using the industry standard DMX 512 digital control protocol This allows the control of the fog system to be easily integrated with the lighting system in most installations DMX may be used without changing any of the settings on the main control panel When the system detects a valid DMX data stream on the input the control will default to the DMX system levels Any attempts to control the machine from the control panel will have no effect until the DMX signal is removed The displays will show the current input values for Fog and Density To ensure correct operation of the displays the standby switch should be set to the ON position when using DMX The machine requires two channels with the address of the first channel set on the DIP switch The channels control the FOG and Density settings in the following manner Channel 1 FOG output level 0 32 zero output dead band 33 255 proportional output level control Implemented in 20 discrete steps Ch
19. s without the need to fit an extra interface PCB to the machine This allows installers to control the functions of the machine using active low signals from a PLC or other automatic control system The fog and density levels must be preset on the display units or alternatively a 0 10v signal can be used at the remote interface connector XLR3 Since the interface has no opto isolators the external control system should use voltage free contacts or opto isolated outputs to control the machine The signals are active low and need a threshold voltage of 1 5V or less 2mA to activate the functions The internal circuits of the interface offer very little overload or interference protection meaning that any control device should be located physically close to the machine This will prevent problems due to long cable runs etc The special function pin 5 is now allocated to allow the machine to be shutdown by a remote fluid sensing system The input is active low and has the same electrical specification as the other inputs To allow the external fluid system to use a remote pump a normally open contact is connected to pins 8 and 9 Pin Allocations 1 Fog 2 Standby 3 Timer 4 Fan 5 Shutdown low fluid 6 Ground 7 N C 8 Remote pump run A 9 Remote pump run B 17 HEAVY FOG GLACIATOR USER GUIDE BASIC OPERATION The following instructions explain how to operate the basic functions of the machine It is assumed that
20. t power This ensures that the output will be continuous although at a reduced level Continuous operation gives rise to the possibility of pump damage if the machine runs out of fluid This is overcome in the Heavy Fog Glaciator by using an electronic fluid sensing system ensuring that the pump is shut down when the fluid level is too low The Left hand display will show a Lo Flu message to warn the user that the machine is shut down due to lack of fluid Variations in pump performance due to supply frequency differences 50 60Hz are compensated for automatically Supply voltage changes will also affect the pump performance and can be catered for by using the Supply Voltage menu SuP on the right hand display unit Using the Menu key select the SuP menu and press enter Now adjust the voltage to match the local power supply voltage valid range is 200 250V Press the enter key to store the new setting in non volatile memory The pumps will now run at the optimum level for the conditions Remember that the type of fluid used will play a large part in determining the resulting effect The list of fluids inside the front cover of this handbook shows the main fluids compatible with this machine Choose a fluid suitable for the venue and type of effect you want to create Generally use the standard B2 fluid but for longer lasting effects contact a distributor for advice on using another fluid grade When operating the machine for long per
21. uring the cycle will halt the operation While the timer is running the left hand display will show the elapsed time in seconds The display will alternate between the period name ton toF and the elapsed time in seconds To set the time periods use the Menu key on the left hand display to set the ton menu as current Press the Enter key to see the current value for the On Time ton and make adjustments using the Up Down keys Now press enter to store the value and use the menu key to select the Off Time toF menu Adjust the value as for the On Time and then enable the Timer switch on the control panel to test the settings The current Fog and Density levels will be used by the timer system when in the ON period 15 HEAVY FOG GLACIATOR USER GUIDE CONTROL PANEL FUNTIONS The control panel provides a means to enable the various functions that control the Fog and Ice operation The switches have a maintained action and are used to set the operating mode of the machine The settings for Fog and Density levels are made using the LED display keypad The Lo Nor amp Hi density settings are used to relate the fan speed to the current level of fog output Use Lo density when using ducting to get maximum thrust from the fan and use Hi density to create a very dense effect although with reduced volume The ramping control system may overide the density setting if required The layout of the control panel is shown in the f
22. utes the system will shut down and enter the power saving mode Power save mode will continue until the machine is fired or the evaporator temperature reaches 4 C To check the status of the refrigeration system at any time use the ICE menu on the right hand display panel The left hand panel will now display the name of the value while the right hand display will show the temperature Use the scroll keys on the right hand display to move through the available values 12 HEAVY FOG GLACIATOR USER GUIDE To store the new value into non volatile memory the enter key must be pressed before moving on to another menu or leaving the edit mode When not in edit mode the display will show information appropriate to the current operating mode To do this the display will alternate between two messages The duration of the first message is typically 1 second whilst the second message will be visible for 2 seconds Some messages are compounded together to form one message eg FLu Lo indicating low fluid in the fluid container As an example when the STANDBY switch on the control panel is set to OFF 0 the display will alternate between FOG and OFF For more information about the messages to expect see the sections covering the different control functions on the machine eg THE TIMER The section entitled DISPLAY MESSAGES contains a complete list of the messages and the circumstances under which they are displayed The
23. ystem is under the complete control of the main microprocessor which also co ordinates all the other activities within the machine Four system temperatures are measured by the control system and are used to regulate the flow of refrigerant via the PWM expansion valve Replacing the normal thermo mechanical expansion valve with an electronically controlled valve brings the following benefits Faster response to load changes Improved control when on light loads No adjustments required Greater tolerance to changes in gas charge Improved compressor starting when hot Power saving idle mode When the refrigeration system is switched off using the ICE switch on the control panel it can only be started by setting the switch to ON There will be a delay of 10 to 30 seconds while the system pressures equalise followed by the motor starting During the motor start cycle the heaters are switched off to reduce the peak current draw If the ICE switch is ON but the compressor is not running the system is in power save mode It will restart when the smoke system is fired any signal source or when the ice switch is cycled The starting delay will depend on the current evaporator temperature but will not prevent immediate production of fog at full output If the machine is not fired the evaporator temperature will drop to 25 C or lower and a timer will start When the unit has been at this temperature without being fired for approximately 20 min
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