LRP Ventilation Control Processor
Contents
1. The LRP trend function assists in logging important system tend values within the control processor Thecollected LRP trend values can be viewed locally at the control processor ofr required per modem transfer to the BMS control center System Macros By seting LRP system macros the control processor can be completely conjured The LRP software menus are automatically set the parameters programmed and the input and output signals allocated Fault Alarmsto a Mobiles Important ports can be sent via modem to a mobile telephone GSM SMS service Minitel O Minitel facilitates complete LRP remote operation functions with no additional sb vare costs either directly via any PC or per mode system specific password protects system access from misuse Esc Key O With the Esc key it is possible to undo one operational step at ay time Modem Enabled The LRPVentilation Control Processor is modem enabled rendering remote maintenance and diagnosispossible Data transfer occur per modem to the BMS control center kiebackeneter 3 Technology for Building Automation The LRP Ventilation Control Processor Why is the LRP so special Single Kno Single Knob Operation The single knob operation together with the graphic lit display make the LR entilation Control Processor very easy to handl he manual operation level of the LRPVentilation Control Processor is sting new standards The user is gui2. ntilators withAir Heating Pump LRP Macro Function The ventilators and the pump are activated wime programs N1 Level 1 N2 Level 2 The start up switch opens the valve Y1 for the air heater and activates the circulating pump K11 The sensor B5 captures the return temperature of the heating medium Should the limit value for the return temperature be reached the supply and exhaust air ventilator K9 K10 is activated With the acknowledgment K1 2 the regulation is enabled The sensor B3 logs the exhaust air temperature alternatively the room temperature while the sensor B2 captures the supply air temperature Based on the control offset from the exhaust air setpoint the cascade control calculates the setpoint for the supply air temperature and activates the outside exhaust and circulating air dampers Y2 as well as the regulating valve for the air heater Y1 until the desired setpoint is reached The minimum and maximum limit values of the supply air temperature is programmable The minimum outside air rate can also be set kiebackeneter Technology for Building Automation K1 K2 K3 K9 K10 When there is a danger of frost thtest protection guard K5 switches of the ventilators closes the outside and exhaust air damper opens the valveY 1 f the air heater ad switches on the pump K When the system is switched on thentin
3. ate ON Control Processor Graphic Display O The graphic display guides the user in the form of plaintextIrend values are represented graphically The display is lit Single Knob Operation The dialog led manual operation level of the control processor is composed of the graphic display and the single knob operatiohhe single control knob enables all operational steps to be menu driven rendeng a user manual superfluous Bus Capability Up to eight control processsrcan be connected via the CAN Bus to a HRP LRP bus systeme bus communication makes all impiant system values available to all LRP units Remote Operation Remote operation of a control processor is possible from any other cool processor within the LRP bus systenthe system parts can be selected in plaintext via the single knob operation Diagnosis o The diagnosis ba enables data to be read using a PC The data is used for data security purposes for saving trend values and for facilitating system diagnosis BMS Connection Fault alarm Manual intervention during running operation is signalized by the hand sign HRP LRP units as well as HRP LRP bus systems can eadh be connected wa RS 232 serial interface to the BMS control centerCommunication occurs via the Kieback amp fter standard P90 protocol kiebackeneter Technology for Building Automation Set Key O The set ey is used to confm an op rational step Trend Function
4. captures the supply air temperature Based on the control af t from the exhaust air setpoint An interval switch pump block protetion prevents the the cascade control calculates the setpoint for the supply air temperature and aotates the regulating blocking of the pumps during system shutdown valve for the air heater Y1 until the desired setpoint isSet LRP Menus reached The minimum and maximum limit values of the Cascade Start Up Switch Limitation 1 Setpoint Sliding Continuous Fost Rotection IdleTime Regulation supply air temperature are programmable kiebackeneter Technology for Building Automation Y Set 1 Operating How 1 Operating How 2 Pump Block otection LimitValue 1 12 LRP System Macro 3 Exhaust Airfemperature Control with HeaterMixedAir Dampes 1 Step Supply and ExhausAir Ventilators withAir Heating Pump LRP Macro Function When there is a danger of frost thest protection guard K5 switches of the ventilators closes the The ventilators and the pump aractivated va outside and exhaust air damper opens the valveyY l fa time programs the air heater ad switches on the pump M The start up swith opens the valve Y1 for the air When the system is switched on thentinuous frost heater and activates the mulating pump K1 protection feature takes effect Thesensor B5 opens the The sensor B5 captures the return temperature o
5. Start Up Switch Y Limitation 1 Setpoint The energy select switchcompares the exhaust air Sliding Energy Select Continuous Frost Protection Idle temperature B3 with the outside air temperature B1 Time Regulation Y Set 1 Operating Hosiri Operating and controls the mixed air dampers Y2 according to Hours 2 Pump Bldc Protection Limit Value 1 the energy provided by the outside air The outside temperature comes into effect as a reference variable via a sensor B1 for raising the room temperature duringummer operation DIN 1946 kiebackeneter 15 Technology for Building Automation LRP System Macro 8 Exhaust Airfemperature Control with HeaterRecuperatve Heat Exchanger and Cooler E 2 Step Supply and ExhausAir ntilators withAir Heating Pump LRP Macro Function The ventilators and the pumps are activated vime programs N1 Level 1 N2 Level 2 The start up switch opens the valve Y1 for the air heater and activates the circulating pump K11 The sensor B5 captures the return temperature of the heating medium Should the limit value for the return temperature be reached the supply and exhaust air ventilator K9 10 is activated With the acknowledgment K1 2 the regulation is enabled The sensor B3 logs the exhaust air temperature alternatively the room temperature while the sensor B2 captures the supply air temperature Based on the control offset from the ex
6. is captured by an additional temperature sensor in the heating medium 1 25 C somal Switching Setpoint Swithing The menu Setpoint Switching is used in heating and ventilation systems that are regulated with alternating setpoints Irespective of usage thes or by means of operational switch wers the egulation switches wer to another setpoint Free Night Cooling Free Night Cooling Via the menu Free Night Cooling the ventilation system is switched on during the night when summer operation is active in order to cool the room air temperature by means of the outside air The room temperature is monitored when the ventilation system is switched off During summer operation the system is switched on before the start of usage timefithe room temperature lies above the room setpoint and the outside temperature is lower than the inside temperature Once the ventilation system has been switched on the outside air dampers are opened for the purpose of cooling and thus free cold energy from outside is utilized Optimise Ventilation Optimise Ventilation The menu Optimise ntilation is used prior to usage for calculating the optimal swilktng on time so that the programmed setpoint is reached as soon as usage begins Should the outsideemperature devide from the room setpoint the switching on time is brought forward The optimisationfunction is acte in heating and cooling modesAn energy co
7. system mao Several system macros are available single Knob Operation The manual operation level of the LREntilation Control Processor is s tng new standardsThe single knob operation and the graphic lit display render the LRPventilation Control Processor simple Actual alue Display 10 46 53 Summer time 12 05 03 Monday press SET Manual Status Quick query Initial menu display press SET E Manual Status Quick query Actual values Setpoints Times Twist the knob td Actual alue to use The user is guided through the menu system by means of plaintext making an operation manual superfuious Everything is self explanatory b2 B2 Supply air b3 B3 Exhaust b5 B5 Heater b6 Sensor 6 M b5 B5 Heater E b6 Sensor 6 Twist knob to Exhaust Air21 3 C press ESC to exit from the Actual Value display and return to the initial menu display Manual Status Quick query Initial menu display kiebackeneter Technology for Building Automation Further LRP Functions Adjusting the Setpoint estar as Setpoints l 5100 XS Room 20 0 C P 5120 XPY1 10 0K 5121 XPY2 10 0K 5122 XPY3 10 0K 5123 XPY4 10 0K 5106 tN 3 0min f Follow the same steps as for the Actual Value Twist knob to XS Room Display XS Poom 20 0 C press SETto confirm the new setpoint of 22 C Twist knob to the new setpoint of 21C
8. For every Y output a minimum and maximum limit value Minimum Air Rate can be parameterised The values for the Xutputs calculated by the LRP basic program may be overwritten manually or by means of the LRP software menus Various sequences of the indidual Youtputs are programmable via LRP parametex Deadzones can be established between th outputs Serial Perfection The LRP softvare menus facilitate the umersal application of the LRRentilation Control Processor Cascade The menu Cascade is an extensioof the basic function Ventilation The cascade control calculates the setpoint for the supply air temperature independently of the control offset from the exhaust air setpoint The minimum and maximum limit values of the supply air temperature are changeable RR parameters In high rooms temperaturetratification can be prevented via a programmable maximum temperature difference The function ofthe cascade control can be compared to a roker The right hand lever of the rocker controls the room temperature and the temperature of the exhaust air With the left hand lever the supply air can be increased or lowered The length of the the supply air lever can be compared with the Control Offset Effect setting When the control offset effect 3 the supply air lever would be 3 times longer than the exhaust air lever when the control offset effect 5 it would be 5 times longer Room Exhaust Air
9. Sewooime ff Ae XS 20 ee ee Le Control Offset Efect 2 Supply Air Room Exhaust Air Setpoint XS 20 Min Limit Value Supply Air Control Offet Effect 2 kiebackeneter Technology for Building Automation LRP Menus vA Continuous Frost Protectic Continuous Frost Potection The menu Continuous Frost Potection is implemented in ventilation systems to continuously monitor frost protectionWhen the ventilation system is switched on entinuous frost protection occur in control operation independently of an analog temperature signal Frost Protectic Pump Frost Protection Pump Via the menu Frost Rotection Pump an internal contact is actvated dependently of an analog temperature signal This internal contact can be used for the activaton of the heater bttry pumps Upon the hysteresis of 3 K being exceeded this internal contact is swithed back agin Remote Adjuster With the menu Remote Adjuster an analog source is addressed to which a remote adjuster tnoected and from which a sted analog value can be read This analog value replaces the setpoint of the LRP control loop The calculated setpoint is displayed on the parameterXS remote programmer kiebackeneter Technology for Building Automation Oy Setpoint Correction TT Setpoint Coriection The setpoint corection works in conjunction with the basic programA set point corection ca
10. Voltage 230 VAC 10 50 60Hz Rated Power 12VA 450mA at 24 AC Displays Backlit graphic display LED Displayfor eror messages and manual operation mode Diagnosis Ba Diagnosis datasecurity Fuses S1 630mA T Degree of Protection IP20 Ambient emperature 0 45 C Ambient Humidity 20 80 relative humidity while in operation condensation not possible 5 90 relative humidity while not in operation condensation not possible Enclosure Plastic housing f me retardant Dimensions 110 0 mmhigh x 198 5nm wide x 7 mmdeep Front Panel Sction 200 4 mmx 1122 0 mm Weight 1 0 kg Identification Sign CE kiebackeneter 17 Technology for Building Automation mee e me munication Cross Functional signales from all devices to all devices energy counter M Bus kiehackenel Technology for Bui Remote control from all devices to all devices kiebackeneter 19 Technology for Building Automation Headquarters Kieback amp Peter GmbH amp Co KG Tempelhofer Weg 50 12347 Berlin Germany Telephone 49 30 600 95 0 Telefax 49 30 600 95 164 Internet www kieback peter de E Mail info kieback peter de Headquarters Export Kieback amp Peter GmbH amp Co KG Telephone 49 30 600 95 100 49 30 600 95 101 Telefax 49 30 600 95 104 kiebackeneter Technology for Building Automation 06 203 GB 300
11. at their disposal yet another method of monitoring the operating system with a high level of transmission security kiebackeneter Technology for Building Automation LRP System Macro 1 E Exhaust Airlemperature Control with Heater E 1 Step Supply and ExhausAir ntilators withAir Heating Pump LRP Macro Function The ventilators and the pump aractivated va time programs The start up swith opens the valve Y1 for the air heater and activates the mulating pump K1 The sensor B5 captures the return temperature of the heating medium Should the limit value for the return temperature be reached the outside and exhaust air dampers ae opened and the supply and exhaust air ventilator K9 actvated Withthe acknowledgment K1 the regulation is enabled K1 K2 K9 When there is a danger of frost thtest protection guard K5 switches of the ventilators closes the outside and exhaust air damper opens the valveyY 1 for the air heate and switches on the pum lt 1 When the system is switched on thentinuous frost protection featuretakes effect Thesensor B5 opens the valve Y1 continuously even when the frost protection temperature is abe that which ws set The fi ter control is enabled via the d ffential pressure guard K6 The sensor B3 logs the exhaust air temperature while The ventilator control is designed fofi step ventilators the sensor B2
12. ature takes effect The sensor B5 opens The sensor B5 captures the return temperature of the the valve Y1 continuously even when the frost heating medium Should the limit value for the return protection temperature is above that which was set temperature be reached the supply and exhaust air ventilator K9 10 is activated With the The fi ter control is enabled via the differential pressure acknowledgment K1 2 the regulation is enabled guard K6 The sensor B3 logs the exhaust air temperature The ventilator control is designed fo step ventilators alternatively the room temperature while the sensor The activation of step 2 occurs at a time delay above B2 captures the supply air temperature Based step 1 Time levels are integrated to avoid on the control offset from the exhaust air setpoint the supersynchronous deceleration during return switching cascade control calculates the setpoint for the supply airfrom the higher to the lower rotational speed They temperature and activates the mixed airamhpers Y2 prevent the V belts of the ventilators from decelerating the regulating valves for the air heater Y1 and the air cooler Y3 in turn until the desiredtoint is reached An interval switch pump block protetion prevents the The minimum and maximum limit values of the supply blocking of the pumps during system shutdown air temperature are programmable The minimum outside air rate canlso be set Set LRP Menus Cascade
13. ded through the menu system by means of plaintext dialog rendering a manual superfluous Everything is self explanatory Bus Enabled The LRPVentilation Control Processor is bus enabled Up to entilation Control Processos can be connected to the HRP LRP bus resulting in impent system values being made available to WHntilation Control Processoss via the bus communication Remote operation of Wentilation Control Processor is possible from any other LRP withthe HRP LRP bus system kiebackeneter Technology for Building Automation Modem Enabled The LRPVentilation Control Processor is modem enabled making remote maintenance and diagnosis possible Thelogging of important system nd values occurs locally in the LRfntilation Control Processor Data tansfer occurs via modem to the higher level BMS control centedmportant messages can be also sent via modem to a mobile telephone SMS service To achieve this astomer specifi c plaintext can be set up for forwardingthin the LRP Macro LRP System Macros System macros are integrated in the LREntilation Control Processor By seting LRP system macros the new LRPVentilation Control Processor is completely configured Thatmeans that with every LRP system macro the coresponding LRP softvare menus are automatically set the parameter programmed and the input and output signals allocated Cesponding functional descriptions and connection instructions form pat of each
14. f the valve Y1 continuously even when the frost protection heating medium Should the limit value for the return temperature is above that whlic was set temperature be reached the supply and exhaust air ventilator K9 is actiated Withthe acknowledgment The fi ter control is enabled via the differential pressure K1 the regulation is enabled guard K6 The sensor B3 logs the exhaust air temperature The ventilator control is designedfor 1 step ventilators alternatively the room temperature while the sensor B2 captures the supply air temperature Based on the An interval switch bump block protetion prevents the control offet from the exhaust air setpoint thascade blocking of the pumps during system shutdown control calculates the setpoint for the supply air temperature and activates the outde exhaust and Set LRP Menus circulating air dampes Y2 as well as the regulating Cascade Start Up Switch Y Limitation 1 Setpoint valve for the air heater Y1 in turn until the desired Sliding Energy Slect Continuous Frost fdtection Idle setpoint is reached The minimum and maximum limit Time Regulation Y Set 1 Operating Hours 1 Pump Block values of the supply air temperature are programmable Protection LimitValue 1 The minimum outside air rate can also be set kiebackeneter 13 Technology for Building Automation LRP System Macro 4 Exhaust Airfemperature Control with HeaterMixedAir Dampers E 2 Step Supply and ExhausAir
15. haust air setpoint th scade control calculates the setpoint for the supply air temperature and activates the heat recovery function K1 K2 K3 The ice accretion protection sensor B4 prevents the recuperative heat exchanger from accumulating ice on the air fbw side Upon reaching a set limiting value the valve Y2 is closed The circulating pump K12 switches on offindependently of the valve position Y2 When there is a danger of frost thtest protection guard K5 switches of the ventilators closes the outside and exhaust air damper opens the valveY 1 fa the air heater ad switches on the pump K When the system is switched on thentinuous frost protection feature takes effect The sensor B5 opens the valve Y1 continuously even when the frost protection temperature is above that which was set The fi ter control is enabled via the differential pressure guard supply aif exhaustair K6 Y2 the control valves for the air heater Y1 and the airhe ventilator control is designed fo step ventilators cooler Y3 in turn until the desired setpoint is reached The activation of step 2 occurs at a time delay The minimum and maximum limit values of the supply above step 1 Time levels are integrated to avoid air temperature are programmable The energy select switchcompares the exhaust air temperature B3 with the outside air temperature B1 and controls the valve Y2 of the
16. he menu Energy Select enables the optimal use of the energy on fr in ventilation systems with incorporated heat recwery features The menu Energy Select compares two freely selectable measurement values for energy choi Areversal of efect occurs with respect to various analog outputs and an internal switching point is set thatan be furtherprocessed in logical links Via LRP parametes the measuring signal difference and the fsteresis can be set Min Max Mean The menu Min Max Mean enables the simultaneous calculation of the smallest value the largest value and the mean value from up to 4 random analog signals Each of the 4 analog signalar be given a wghing factor 10 Impulse Count Heat Quantit Impulse Counter Heat Quantity This menu provides pulse and heat quantity meter reading up to 298z The heat quantity meter reading pulse meter reading 1 isrfily allocated to the input contact K7 The heat quantity meter reading impulse meter reading 2 igrfily allocated to the input contact K8 Heat quantity and heat output are allocated by a set factor to each pulse The pulses are multiplied with the factor A meter reading always occurs at the left hand edge G gt Pump Block Protection Pump Block Potection The menu Pump Blok Protection guarantees pump antiblocking protetion in ventilation systems that are to be completely swited off for a longer period of time min 24 hosik Aforced activat
17. ion of the circulating pump thereby occsironce in 24 hours with a pgrammable time 6 activation and minimum running time Mixed Air Control Se Mixed AirControl This menu lays a trapezoidharacteristic cuve on a freely selectabl output Theallocated outsice temperature serves as the reference variablbhe Y output upon which the menu should talef ct is established 11 Limit Values SS Limit Values In order to create limit values any analog value of the LRP system sensors measurement and calculation values can be accessed per source parameterisation Upon exceeding the limit value 1 the digital parameter Result Limit Value 1 is seb tl Ths value can be parameterised as a digital source in control links Modem llc lr LZ Modem With the aid of the LRP software menu Modem it is possible to connect the LRP Ventilation Control Processor to the hig r level BMS control center via the telephone network Remote transfer dn maintenance of the ventilation system is thus enabled Automatic dialing to the BMS control center can be parameterised for certain important alarm messages in the ventilation system GSM SMS GSM SMS Important alam messages from the operating system are transitted with the aid of the LRP software menu GSM SMS to a mbile telephone 160 is the maximum number of chattacs allowed for each SMS message Userof the LRRentilation Control Processor thus ave
18. kiebackeneter Technology for Building Automation Viewing the Control System Control links can be parameterised easily The status of the digital outputs and internal relays is displayed Viewing Trend Alues A maximum of two LRP values can be displayed at the same time on the LRP graphic display Trend values from 1 day up to 7 days can be chosen depending on the resolution Viewing Quick equest Quick query XS Room 20 0 C Serv Hr allowed 1 5 Serv Hr allowed 2 B1 Outdoor B2 Supply air B3 Exhaust LRP Menus iie LRP Software Me T LRP Sotware Menus The basic program of the LRP Ventilation Control Processor is extended by the multitude of LRP software menus available to it These ensure that adaptations to meet the differing demands placed on ventilation systems is a given The LRP software menus Modem GSM SMS as well as the trend function of the LRP Ventilation Control Processor all provide the means of communication with a higher level BMS control center and also ensure continual monitoring of the ventilation system The LRP software menus come delivered with the LRP Ventilation Control Processor Ventilation The LRP basic program makes up to four Y outputs available to the LRP control loop The calculation of the control loops occurs when the control loop is in the regulation operating mode The desired setpoint for the regulation is set in the LRP basic program
19. mparison determines whether pure circulating air or pure outside air will be used to achieve rapid h ing or cooling kiebackeneter Technology for Building Automation LRP Menus Start Up Switch The menu Start Up Switch is used in ventilation systems during winter operation in order to avoid temperatures falling below optimal levels A time delayed activation of the ventilation system occurs during winter operation The heating valve is opened according to set times before the ventilation system is switched on SE 32C Setpoint Slid e Setpoint Sliding The menu Setpoint Sliding causes a setpoint shift dependently of a reference variable for the ventilation control loop Via a command signal the control setpoint is raised or lowered LRP parameterfor seting Slide Start SlideEnd and Influence determine the influence of the command signal on the setpoint shif Setpoint XS Slide Stat lt SlideEnd Reference Variable kiebackeneter Technology for Building Automation Y Limitation With the menu Y Limitatio a minimum or maximum limit value is applied in heating and ventilation control loops A continuous minimum and maximum limitation occurs independently of any limit value The limit setpoint can glide according to the outside temperature With multiple sequences the limit function has an effect on one selected sequence Energy Select Energy Select T
20. n occur for example via a cogction programmer within a room Thecorrection area is established by a LRP parameter e g 5 B e Y 45 Y Set Y Set The menu Y Set allows indvidual analog outputs to be taken out of the gelation and set in rgeted way to a defiable value The menu Y Set is actwated via an internal contact and has priorityeo the menu Y Limit XS Fixed Value Fixed alue The menu FixedValue Controller is in its basi function a PID controller with one Y output The controlled varidle sensor is defied in the conblled variable fxed value parameter Two setpoistcan be switched between independently of a binary source The output signal of the d value controlle has an effect on th amp FW which can ballocated a free Y output per sourceallocation Sequence Reversal Sequence Reversal With the menu Sequence Peversal theY outputs identified in this LRP softave menu are revesed in their efect when the digital source for tf utput is set to actie to tos XO Idle Time Regulation Idle Time Regulation The menu ldle Time Regulation is implemented in ventilation systems to ofr comprehensive freee protection through the regulation of a minimum temperature in the heating medium During winter operation a LRP setpoint for the regulation of a minimum temperature in the heating medium is effective when the ventation system is switched off The actual value
21. recuperative heat exchanger heat recovery according to the energy provided by the outside air The outside temperature comes into effect as a reference variable via a sensor B1 for raising the room temperature duringummer operation DIN 1946 kiebackeneter Technology for Building Automation supersynchronous deceleration during return switching from the higher to the lower rotational speed They prevent the V belts of the ventilators from decelerating An interval switch pump block protetion prevents the blocking of the pumps during system shutdown Set LRP Menus Cascade Start Up Switch Y Limitation 1 Y Limitation 2 Setpoint Sliding Energy Select Continuous Frost Protection IdleTime Regulation Y Set 1 Operating Hours 1 Opeating Hours 2 Pump Bld amp cProtection Limit Value 1 Limit Value 2 16 Connection Diagram Technical Specifications LRP4 Y2 H gt Y3 at Y4 24V AC KOR RX RS232 TX P90 LRP4 lt kiebackeneler Digital Inputs 8 x potential free contact inputs including two 20 Hz pulse inputs Digital Outputs 4 x relay outputs max 68 24 AC Analog Inputs 6 x KP10 actie measurement system 3 x continuous 0 10 Analog DigitalConversion 10 Bit Actuator Output 4 x continuous 0 10 5mA at 10 Serial Interface RS 232 for connection of BMS control center or modem Bus Connection CAN bus for connection of up to a maximum of 8 LRP to one bus system Rated
22. uous frost protection feature takes effect The sensor B5 opens the valve Y1 continuously even when the frost protection temperature is above that which was set The fi ter control is enabled via the differential pressure guard K6 The ventilator control is designed fo step ventilators The activation of step 2 occurs at a time delay above step iTime levels are integrated to aid supersynchronous deceleration during return swilbtng from the higher to the lower rotational spe tey prevent theV belts of the ventilators m decelerating Set LRP Menus Cascade Start Up Switch Y Limitation 1 Setpoint Sliding Energy Select Continuous Frost Protection Idle Time Regulation Y Set 1 Operating Hosir1 Operating Hours 2 Pump Bldc Protection Limit Value 1 14 LRP System Macro 6 Exhaust Airfemperature Control with HeaterMixedAir Dampers Cooler 2 Step Supply and ExhausAir ntilators withAir Heating Pump LRP Macro Function When there is a danger of frost thest protection guard K5 switches of the ventilators closes the The ventilators and the pump are activated vime outside and exhaust air damper opens the valveY 1 fa programs N1 Level 1 N2 Level 2 the air heater ad switches on the pump M The start up switch opens the valve Y1 for the air When the system is switched othe continuous frost heater and activates the circulating pump K11 protection fe
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