Building Automation Knowledge Base

Issue Selection and installation of a pulsed output module. Product Line Andover Continuum, EcoStruxure Building Operation, Field Devices, Satchwell Sigma, TAC Vista Environment Heat Meter Multical 602 Pulsed output module No pulses Cause Installed card does not give output pulses. Resolution Selection of the output card. The Schneider Electric part number is MAPULSETOPC and this is the equivalent to Kamstrup part number 602-0C This card will provide 2 pulse outputs for energy and volume, CE and CV respectively. Normally, energy (CE) is connected to 16-17 and volume (CV) to 18-19, but other combinations can be selected via the PC program METERTOOL, also used to select pulse duration 32 or 100 ms. The MAPULSETOPC is actually a top module, which means that it is fitted into the top piece of the MC602 calculator, basically the inside LCD cover. This is released by pressing downwards in the middle of the plastic piece on the left, and at the same time pushing the top module towards the left.

Issue When an SLR320 light level sensor has power applied a transient voltage (approx. 17VDC) is seen on the output. Environment SLR320 Cause In order to provide dual output capability (voltage and current) with both AC and DC supply, it is necessary to use a capacitor to filter the AC supply. This capacitor is also active in current mode because it is placed behind the rectifier at the G clamp. An additional resistance is added inside to minimize this load current. This load current of the capacitor (which is the cause of transient voltage) cannot be reduced to zero, otherwise the voltage output cannot be used at AC supply within its specification (max. output voltage @ min. load resistance @ min. supply voltage, Y clamp). Resolution This behavior is expected and by design. The transient voltage generated by the load current is settled within approximately 40ms and occurs only at power up. The transmitter is continuously powered so this would not normally be an issue and would have stabilized before a controller that was powered up at the same time would be booted and scanning it's inputs.

Issue Some actuator datasheets do not specify the impedance of the 0-10V control signal, this is required to determine fan out from a controller. Product Line Field Devices Environment MB3 Range - MB3-24M, MB3-SO-24M, MB3-SC-24M MZ20 Range - MZ20A, MZ20A-R MVT56 Range Cause Information not defined on the specification sheet. Resolution MB3 Range 0-10V control signal input impedance = 200K Ohms. MZ20 and MVT56 Ranges 0-10V control signal input impedance = 32K Ohms.

Issue Satchwell AZ2401 Rotary Actuator requires replacement. Product Line Field Devices Environment Satchwell AZ2401 Rotary Actuator installed on Satchwell MBF Series Rotary Shoe Valve Body. Cause Obsolescence of Satchwell AZ2401 Rotary Actuator Resolution The Satchwell AZ2401 actuator would normally have been installed on a Satchwell MBF Valve Body. The Actuator comprised a 6 wire electrical connection enabling it to be operated from a Satchwell Z Monotronic or CZT Climatronic Proportional Controller as follows: Terminal 1 – Open signal Terminal 2 – Close signal Terminal 3 – Common Terminal A – 135 ohm Feedback Potentiometer – winding Terminal B – 135 ohm Feedback Potentiometer – wiper Terminal C – 135 ohm Feedback Potentiometer – winding If all 6 wires are connected then the AZ2401 actuator may be replaced by following SE actuators: MD20B-24 + Linkage Kit 914-1070-000 from Schneider Electric and an accessory kit   P140A from Belimo If only 3 wires are connected, that is to terminals 1, 2 and 3 then the P140 accessory kit is not required.

Issue Is there an option to disable the Forta actuator zero point check/adjustment on power up?  Environment Schneider Electric Forta actuators Cause The Forta actuator running the zero point check/adjustment on power up is causing an issue in the control sequence of the plant.  Resolution It is not possible to disable the zero point check/adjustment on power up of the the Forta actuator by any configuration of the dipswitches. The function is coded into the actuator firmware. 

Issue Satchwell "AL..S" series Spring Return Linear Actuator requires replacement. Product Line Field Devices Environment Satchwell “AL..S” series Spring Return Linear Actuator installed on Satchwell MJF, MZ, MZF, VJF, VSF, VZ or VZF series Plug and Seat Valve Body.  Cause Obsolescence of Satchwell “AL..S” series Spring Return Linear Actuator. Resolution Replace Satchwell ALMS Actuator with S-E M700 Actuator. The S-E M700 Actuator may be used to replace an existing Satchwell ALMS Actuator. It should be noted however that the S-E M700 Actuator is suitable for use with 24 volt power supplies only, while the Satchwell ALMS Actuator is a mains voltage device. The S-E M700 Actuator has an average power consumption of 30 VA and the use of an independent 230 / 24 volt Transformer rated 50 VA is recommended.  S-E Transformer Type TR60 (341-3060-000)   Replacement of Satchwell ALXS Actuator with S-E M700 Actuator. The S-E M700 Actuator may be used to replace an existing Satchwell ALXS Actuator. It should be noted however that where an existing Satchwell ALXS Actuator has been connected to a Satchwell Climatronic Controller via an independent Transformer, it is probable that the Transformer will have been rated to provide the level of power required by a single ALXS Actuator (23VA) In such circumstances the existing independent Transformer may also require replacement by another independent Transformer, rated to provide the greater level of power required by a single S-E M700 Actuator (50VA) S-E Transformer Type TR60 (341-3060-000)   Replacement of Satchwell ALES Actuator with S-E M700 Actuator. The S-E M700 Actuator may be used to replace an existing Satchwell ALES Actuator. It should be noted however that where an existing Satchwell ALES Actuator has been connected to a Satchwell Climatronic Controller via an independent Transformer, it is probable that the Transformer will have been rated to provide the level of power required by a single ALES Actuator (26VA) In such circumstances the existing independent Transformer may also require replacement by another independent Transformer, rated to provide the greater level of power required by a single S-E M700 Actuator (50VA) S-E Transformer Type TR60 (341-3060-000)   Please check the latest catalog for current equipment.

Issue Replacement of Satchwell Sunvic control devices. Environment On / Off temperature control applications  Domestic installations. Cause Satchwell Sunvic control device requires replacement.. Resolution Satchwell Sunvic Ltd. was a sister company of Satchwell Control Systems Ltd. Satchwell Sunvic Ltd. primarily manufactured domestic Thermostats and Central Heating Programmers etc. Satchwell Sunvic Ltd. was sold to another group of companies and left the Satchwell Group of Companies. At that time all Satchwell Sunvic Ltd. ON/OFF control devices were transferred to that group of companies.   There are currently no equivalent products in the Schneider Electric / TAC / Satchwell range of products. Satchwell Sunvic Ltd. now trade as Sunvic Controls Ltd. and may be contacted as follows :- Sunvic Controls Ltd. General Enquiries :- T: +44 (0) 1698 812 944 F: +44 (0) 1698 813 637 Email. enquiries@sunvic.co.uk Technical Helpline :- T: +44 (0) 1698 810 945 Email.  technical@sunvic.co.uk

Issue Satchwell RM3601 mains voltage Light Duty Actuator split phase capacitor motor rating is 24 volts. Environment Satchwell RM3601 mains voltage Light Duty Actuator mounted on Satchwell MB Rotary Shoe Valve Body.. Satchwell RM 3601 mains voltage Light Duty Actuator mounted on Satchwell MB Rotary Shoe Valve Body.. Cause Satchwell RM3601 mains voltage and XRM3201 24 volt Light Duty Actuator both utilise a 24 volt rated split phase capacitor motor. A dropper resistor installed across the RM3601 input terminals during manufacture is designed to enable this Light Duty Actuator to be utilised in mains voltage applications. Resolution The presence of a 24 volt split phase capacitor motor within a RM3601 mains voltage Light Duty Actuator should not lead an installer to believe that the Actuator has been manufactured incorrectly.. A dropper resistor installed across the RM3601 input terminals during manufacture is designed to enable this Light Duty Actuator to be utilised in mains voltage applications.   Please check the latest catalog for current equipment.  

Issue Satchwell MBF 3-port Rotary Shoe Valve Body Open / Close status determination from Spindle position. Environment Satchwell MBF 3-port Rotary Shoe Valve Body installations. Cause Satchwell MBF 3-port Rotary Shoe Valve Body is installed in pipework and Open / Close status cannot be determined by observing Valve Body Shoe positions. Resolution The Satchwell MBF 3-port Rotary Shoe Valve Body Spindle protrudes through the side of the Valve Body. The position of the Valve Body Shoes may be determined by observing the position of a hole drilled through the Valve Body Spindle. If the hole is ( l ) then Valve Body is fully open to Port 2 If the hole is ( -- ) then Valve Body is fully open to Port 3 If the hole is ( / ) then Valve Body is half open to Port 2 and half open to Port 3   When the hole through the Valve Body Spindle is VERTICAL having turned the Valve Body Spindle fully Anticlockwise, then the Valve Body is fully open to flow and fully closed to bypass. When the hole through the Valve Body Spindle is HORIZONTAL having turned the Valve Body Spindle fully Clockwise, then the Valve Body is fully closed to flow and fully open to bypass. When the hole through the Valve Body Spindle is at an ANGLE of say 45 degrees, then the Valve Body is half open to flow and half open to bypass.   Please check the latest catalog for current equipment.  

Issue Satchwell MBX 3-port Rotary Shoe Valve Body Open / Close status determination from Spindle position. Environment Satchwell MBX 3-port Rotary Shoe Valve Body installations. Cause Satchwell MBX 3-port Rotary Shoe Valve Body is installed in pipework and Open / Close status cannot be determined by observing Valve Body Shoe positions. Resolution The Satchwell MBX 3-port Rotary Shoe Valve Body Spindle protrudes through the side of the Valve Body. The position of the Valve Body Shoes may be determined by observing the angle of the Slot in the end of the Valve Body Spindle. If the slot is ( \ )  then Valve Body is fully open to Port 2 If the slot is ( / )  then Valve Body is fully open to Port 3 If the slot is ( | )  then Valve Body is half open to Port 2 and half open to Port 3 With the Spindle Slot in the 10 o'clock position the Valve Body is fully open to flow and fully closed to bypass. With the Spindle Slot in the 2 o'clock position the Valve Body is fully open to bypass and fully closed to flow.   With the Spindle Slot in the Vertical position the Valve Body is half open to flow and half open to bypass.   Please check the latest catalog for current equipment.

Issue Satchwell MB 3-port Rotary Shoe Valve Body Open / Close status determination from Spindle position. Environment Satchwell MB 3-port Rotary Shoe Valve Body installations. Cause Satchwell MB 3-port Rotary Shoe Valve Body is installed in pipework and Open / Close status cannot be determined by observing Valve Body Shoe positions. Resolution The Satchwell MB 3-port Rotary Shoe Valve Body Spindle protrudes through the side of the Valve Body. The position of the Valve Body Shoes may be determined by observing the angle of the Slot in the end of the Valve Body Spindle. If the slot is ( \ )  then Valve Body is fully open to Port 2 If the slot is ( / )  then Valve Body is fully open to Port 3 If the slot is ( l )  then Valve Body is half open to Port 2 and half open to Port 3          With the Spindle Slot in the 10 o'clock position the Valve Body is fully open to flow and fully closed to bypass.        With the Spindle Slot in the 2 o'clock position the Valve Body is fully open to bypass and fully closed to flow.        With the Spindle Slot in the Vertical position the Valve Body is half open to flow and half open to bypass.   Please check the latest catalog for current equipment.  

Issue Satchwell RM series Rotary Actuator does not open or close Satchwell MB series Rotary Shoe Valve Body due to incorrect wiring connections. Environment Satchwell RM series Rotary Actuator installed on Satchwell MB series 3-port Rotary Shoe Valve Body. Cause Satchwell RM series Rotary Actuator incorrect wiring connections. Resolution 1.  Check Satchwell RM series Actuator wiring connections. Wiring connections should comply with the following :- Actuator Terminal 1 = Live to OPEN Actuator Terminal 2 = Live to CLOSE Actuator Terminal 3 = Neutral N.B. The Satchwell RM series Actuator must be connected to a controlling switching device such as a Thermostat, Switch, Relay or Programmer providing CHANGEOVER CONTACT switched outputs rated at mains voltage.  2.  Ensure no other electrical device is connected between controlling switching device and Satchwell RM series Actuator. N.B. In such circumstances back feeds can cause the Satchwell RM series Actuator to stall which in turn may result in the electric motor within the Actuator burning out. 3.  Rewire Satchwell RM series Actuator as necessary and observe direction of operation is relative to control signal applied. 4.  Transfer Switches installed within the Satchwell RM series Actuator enable a Pump or Boiler etc. to be switched via the Actuator. Terminal 1 signal transfers to Terminal 1T when Satchwell RM series Actuator is fully OPEN Terminal 2 signal transfers to Terminal 2T when Satchwell RM series Actuator is fully CLOSED    Please check the latest catalog for current equipment.  

Issue Satchwell MB series 3-port Rotary Shoe Valve Body conversion for use as a 2-port Zone Valve. Environment HVAC heating and cooling installations requiring a 2-port Zone Valve having pipework connection size in excess of 3/4" B.S.P. Cause HVAC heating or cooling installations requiring a 2-port Zone Valve Body having a connection sizes in excess of the usual 3/4" B.S.P. HVAC heating or cooling installations requiring a 2-port Valve Body to be installed in place of a 3-port Valve Body originally installed.  Resolution 1  Install plumber's plug in Port 3 of MB series 3-port Rotary Shoe Valve Body. 2. Tighten plumber's plug sufficiently to ensure PN 10 rating of Valve Body is not compromised. IMPORTANT Careful consideration should be given to the use of this conversion method with 3-port Valve Bodies of Plug and Seat construction. Here only "dish nosed" or "hollow ended" plumber's plugs should be installed in Port 3 of the Valve Body. The purpose of this is to prevent fouling of the Plug / Seat assembly within the Valve Body. N.B. In preference a Satchwell VZ 2-port Plug and Seat Valve Body should be replaced by a Satchwell MZ 3-port Plug and Seat Valve Body.

Issue S-E Forta M700 Actuator unable to be mounted on S-E VGS211F Valve Body . Environment S-E Forta M700 Actuator mounted on S-E VGS211F Valve Body  Cause S-E Forta M700 Actuator unable to be mounted on S-E VGS211F Valve Body due to absence of S-E VGS211F Valve Body Spindle Adaptor. Resolution 1.  Install S-E VGS211F Valve Body Spindle Adaptor prior to installation of S-E Forta M700 Actuator. The S-E VGS211F Valve Body is supplied with a Valve Spindle Adaptor. The Adaptor is illustrated in the S-E Forta M700 Installation Instruction (OFL – 4340 – 001). It is particularly important to ensure that this Adaptor is fitted to the Valve Spindle, as its absence will prevent the M700 Actuator from being mechanically connected to the Valve Body Spindle.

Issue DC1100 / DC1400 displays message "No Sensors Connected" or displays temperature values that are not representative of the temperatures being sensed. Environment DC1100 / DC1400 Discrete Controller and associated Sensors. Cause DC1100 / DC1400 is connected to Sensors having incompatible resistance range. The resistance range of those Sensors compatible with the DC1100 differs to that of the resistance range of those Sensors compatible with the DC1400 "No Sensors Connected" message may appear in the Controller display as a result of the Sensors connected having a resistance that is out of range compared to that of the resistance range that the Controller Sensor Inputs are designed to recognise.  Resolution Check Sensor type connected to Controller. DC1100 Controller is compatible with the following Sensors :- STC 600 D Contact Temperature Sensor                               (Original Drayton Sensor = A704) STO 600 D Outside Air Temperature Sensor                          (Original Drayton Sensor = A702) STP 600 D Pipe Temperature Sensor                                     (Original Drayton Sensor = A703) STR 600 D Room Temperature Sensor                                  (Original Drayton Sensor = A701)   DC1400 Controller is compatible with the following Sensors :- STC 600 Contact Temperature Sensor                                   (Original Satchwell Sensor = DST) STO 600 Outside Air Temperature Sensor                             (Original Satchwell Sensor = DOT)    STP 660 Pipe Temperature Sensor                                        (Original Satchwell Sensor = DWT) STR 600 Room Temperature Sensor                                     (Original Satchwell Sensor = DRT)

Issue AVUE 5304, AVUE 5354, AVUE 5305 or AVUE 5355 Light Duty Actuator does not respond to changes in control signal. Environment AVUE 5304 or AVUE 5354 Light Duty Actuator installed on VZX or MZX Valve Body.. AVUE 5305 or AVUE 5355 Light Duty Actuator installed on Satchwell VEU, MEU or FEU Unit Valve Body.. Cause AVUE 5304, AVUE 5354, AVUE 5305 or AVUE 5355 Light Duty Actuator may not respond to changes in control signal due to self stroking / auto stroking procedure failing to occur when originally installed, or due to manual override having been undertaken without subsequent reset procedure having been applied. Resolution 1.  Check that 0v of 0-10v dc control signal and 0v of 24v ac power supply originate from same source. 2.  Undertake Manual Override Reset. The Manual Override Reset Button is located on the underside of the AVUE Actuator. The purpose of the Manual Override Reset Button is to cause the Actuator to self reference. A reset is required only in the following circumstances. A.  If the Manual Override Access screw on the top of the Actuator has been operated when the Actuator is powered up. B.  If it is necessary to re-align the Actuator to a point of self reference during periods of system maintenance. N.B. The AVUE is designed to reset automatically on restoration of power following a power failure.  It should be noted that it will take approximately 85 seconds (AVUE 5305 and AVUE 5355) or 110 seconds (AVUE 5304 and AVUE 5354) for the self reference procedure to be completed. 

Issue S-E VZ29, VZ39 and VZ49 Unit Control Valve Open / Close status required relative to spindle position. Environment S-E VZ29, VZ39 and VZ49 Unit Control Valve installations. Cause Open / Close status of S-E VZ29, VZ39 and VZ49 Unit Control Valve is not visually apparent Resolution Observe S-E VZ29, VZ39 and VZ49 Unit Control Valve spindle position. S-E VZ29, VZ39 and VZ49  =  Spindle DOWN OPEN / Spindle UP CLOSE   Please check the latest catalog for current equipment.

Issue Importance of correct selection / installation of Satchwell 3-port Valve Body to provide Mixing function or Diverting function. Environment Satchwell 3-port Valve Body to provide Mixing function or Diverting function in heating or cooling circuit.   Satchwell MB, MBF, MJF, MZ, MZF, MZX Cause Incorrect selection / installation  of Satchwell 3-port Valve Body to provide Mixing function or Diverting function may result in poor control, damage to the Valve Body, damage to the Valve Actuator or damage to the hydraulic installation. Resolution Determine which of the following types of hydraulic circuit the Satchwell 3-port Valve Body is to be installed in. Constant Temperature Variable Volume (CT) circuit e.g. AHU Heating / Cooling Coil or Calorifier Coil  Variable Temperature Constant Volume (VT) circuit e.g. Radiator System For Constant Temperature circuit application install Satchwell 3-port Valve Body as follows :- MJF, MZ, MZF, MZX install in RETURN pipework. Port 3 - Connect to Bypass (IN) Port 2 - Connect to Coil Return (IN) Port 1 - Connect to System Return (OUT) MB, MBF install in RETURN pipework. Port 3 - Connect to Bypass (IN) Port 2 - Connect to Coil Return (IN) Port 1 - Connect to System Return (OUT) OR MB, MBF may alternatively be installed in FLOW pipework Port 3 - Connect to Bypass (OUT) Port 2 - Connect to Coil Flow (OUT) Port 1 - Connect to System Flow (IN) For Variable Temperature circuit application install Satchwell 3-port Valve Body as follows :- MJF, MZ, MZF, MZX install in FLOW pipework. Port 3 - Connect to Bypass (IN) Port 2 - Connect to Boiler Flow (IN) Port 1 - Connect to System Flow (OUT) MB, MBF install in FLOW pipework. Port 3 - Connect to Bypass (IN) Port 2 - Connect to Boiler Flow (IN) Port 1 - Connect to System Flow (OUT) OR MB, MBF may alternatively be installed in RETURN pipework Port 3 - Connect to Bypass (IN) Port 2 - Connect to System Return (IN) Port 1 - Connect to Boiler Return (OUT) N.B. It should be noted that the alternative installation methods are valid for the MB and MBF Valve Bodies due to the ROTARY SHOE construction of the MB and MBF Similarly it should be noted that the alternative installation methods are not valid for the MJF, MZ, MZF and MZX Valve Bodies due to the PLUG AND SEAT construction of the MJF, MZ, MZF and MZX . Failure to install MJF, MZ, MZF and MZX Valve Bodies correctly in the pipework may result in VALVE VIBRATION in the pipework caused by WATER HAMMER    INSTALLATION OPTIONS - MJF, MZ, MZF and MZX 3-PORT PLUG AND SEAT VALVES MAY BE INSTALLED TO MIX IN THE FLOW VALVE BODIES USE TWO “IN” PORTS (Ports 2 & 3) AND ONE “OUT” PORT(Port 1)   3-PORT PLUG AND SEAT VALVES MAY BE INSTALLED TO DIVERT (BY MIXING) IN THE RETURN VALVE BODIES USE TWO “IN” PORTS (Ports 2 & 3) AND ONE “OUT” PORT(Port 1)   INSTALLATION OPTIONS - MB, MBF  3-PORT ROTARY SHOE VALVES MAY BE INSTALLED TO MIX IN THE FLOW USING TWO “IN” PORTS (Ports 2 & 3) AND ONE “OUT” PORT (Port 1) 3-PORT ROTARY SHOE VALVES MAY BE INSTALLED TO MIX IN THE RETURN.USING ONE “IN” PORT (Port 1) AND TWO “OUT” PORTS (Ports 2 & 3)) 3-PORT ROTARY SHOE VALVES MAY BE INSTALLED TO DIVERT IN THE RETURN USING TWO “IN” PORTS (Port 2 & 3) AND ONE “OUT” PORT (Port 1) 3-PORT ROTARY SHOE VALVES MAY BE INSTALLED TO DIVERT IN THE FLOW USING ONE “IN” PORT (Port 1) AND TWO “OUT” PORTS (Port 2 & 3)   RELATED INFORMATION - DIVERTING IN THE FLOW It should be noted that some manufacturers produce 3-Port Plug and Seat Valve Bodies specifically designed to DIVERT in the FLOW.  Such Valve Bodies have 1 IN Port and 2 OUT Ports   Please check the latest catalog for current equipment.  

Issue Satchwell ALM series Linear Actuator requires replacement. Environment Satchwell ALM series Actuator installed on Satchwell MJF, MZ, MZF, VJF, VSF, VZ or VZF Series Plug and Seat Valve Body.    Satchwell ALM series Linear Actuators. Cause Obsolescence of Satchwell ALM series Linear Actuator. Resolution Replace Satchwell ALM series Linear Actuator with MV15B-230 Linear Actuator and Linkage Kit and wire as follows :- ALM = MV15B-230 + L7SV (880-0126-000) Linkage Kit. Actuator wiring :- ALM Terminal Number 1  =  MV15B-230 Terminal Number Y2  ALM Terminal Number 2  =  MV15B-230 Terminal Number Y1  ALM Terminal Number 3  =  MV15B-230 Terminal Number N N.B. ALM power consumption  =  4.5 VA          MV15B-230 power consumption  =  12 VA operating and 15 VA Transformer sizing Should the Satchwell ALM series Actuator include a wired Auxiliary Switch (ALA1211) then the following Accessory should also be installed on the MV15B-230 Actuator as appropriate and should be wired as follows :- S2 - MV15B = Two independent 250 volt 10 amp / 3 amp rated SPDT Auxiliary End Point Switches. Auxiliary Switch wiring :- ALA1211 Terminal S1  =  S2 - MV15B Switch 1 Terminal C ALA1211 Terminal S2  =  S2 - MV15B Switch 1 Terminal B ALA1211 Terminal S3  =  S2 - MV15B Switch 1 Terminal A ALA1211 Terminal S4  =  S2 - MV15B Switch 2 Terminal C ALA1211 Terminal S5  =  S2 - MV15B Switch 2 Terminal B ALA1211 Terminal S6  =  S2 - MV15B Switch 2 Terminal A   Please check the latest catalog for current equipment.  

Issue SVT Controller will not operate plant under Auto control following Clock replacement Environment SVT 4201 Optimiser Controller  SVT 4251 Optimiser Controller  Cause SVT Controller will not operate plant under Auto control following Clock replacement due to lack of re-commissioning. Resolution Re-commission SVT Controller using Test method. The absence of plant control may normally be confirmed by lack of illumination of Burner L E D (bottom left corner of SVT)  Test method of re-commissioning may be undertaken as follows: Ensure SVT 4201 Analogue Clock override button is set to AUTO condition and Clock is in an ON period. Ensure SVT 4251 Digital Clock status is set to AUTO condition and Clock is in an ON period. Ensure SVT Manual Override Switch (lower left of SVT) is set to AUTO Note SVT Preheat Selector Switch (lower centre of SVT) setting (scaled 1,2,3,4,5,T) Turn Preheat Selector Switch fully clockwise from Preheat number setting to letter T Turn Manual Override Switch fully anti-clockwise from AUTO setting to O (Off)  Turn Manual Override Switch fully clockwise from O (Off) setting to + (ON) Burner L E D should illuminate and plant should start. Turn Manual Override Switch anti-clockwise from + (ON) setting to AUTO Burner L E D should remain illuminated and plant should continue to run. If plant continues to run then proceed to action L.  If plant remains OFF then return to action A. Turn Preheat Selector Switch anti-clockwise from T position to previously noted SVT Preheat Selector Switch setting.