Frequently Asked Questions

When a NRG control displays "HEAT OFF" this would indicate that the following situation may have occurred:- The desired temp (target temp) required in the heated space has been reached To check or change the temp Press PROG/COPY button Type in "0000" or your code if you have on The control should now display "1 TEMP 2 DATA 3 SYSTEM 4 HOLS" Select option "1 TEMP" The current target temp will now be displayed, target temp default setting is 20°C Simply key in the new required daytime temp and press enter You will now have a choice to enable or disable frost protection "1 ON 2 OFF"
When a NRG control displays "HEAT OFF" this would indicate that the following situation may have occurred The day time heating program has elapsed To check times in the existing time program Press PROG/COPY button Type in "0000" or your code if you have on The control should now display "1 TEMP 2 DATA 3 SYSTEM 4 HOLS" Select option "2 DATA" The control should now display e.g. "MON PERIOD 1 S 09:00 E 17:30" Press ENTER to scroll through program times to the end checking they are correct until the control displays "1 TEMP 2 DATA 3 SYSTEM 4 HOLS" Now press RUN/FAN button to exit the programming screen and return the control to normal operation If the display is as shown below this would indicate that no times have been programed "MON PERIOD 1 S HH:MM E HH:MM" To program times in the NRG The NRG has 3 programmable periods in a 24 hr day PERIOD 1 PERIOD 2 PERIOD 3 this allows the user more flexibility in programming hours. The user may want short operating periods throughout the normal working day, or may require heating for a shift pattern with control to turn off the heating during shift change overs Remember if individual operating periods are set the temp requirement cannot be changed for each operating period simply to say the target temperature setting remains the same constant Below is a basic time program which gives one time period this is the most common type of program suitable for most users Press PROG/COPY button Type in "0000" or your code if you have on The control should now display "1 TEMP 2 DATA 3 SYSTEM 4 HOLS" Select option "2 DATA" The control should now display "MON PERIOD 1 S HH:MM E HH:MM" Simply key in new S (start time) and press ENTER .e.g. 0830 The control should now display "MON PERIOD 1 S 08:30 E HH:MM" Simply key in new E (end time) and press ENTER .e.g. 16:30 The control should now display "MON PERIOD 1" S 07:30 E 16:30" The control should now display "MON PERIOD 2" Leave blank and press enter The control should now display "MON PERIOD 3" Leave blank and press enter The control should now display "MON PERIOD 3" Leave blank and press enter The control should now display "TUE PERIOD 1" At this point if the time of operation is the same as MONDAY simply press the PROG/COPY button this function copies the times as set for MON and Pastes them into TUE The control should now display "WED PERIOD 1" At this point if the time of operation is the same as TUESDAY simply press the PROG/COPY button this function copies the times as set for TUE and Pastes them into WED The control should now display "THURS PERIOD 1" At this point if the time of operation is the same as WEDNESDAY simply press the PROG/COPY button this function copies the times as set for WED and Pastes them into THURS The control should now display "FRI PERIOD 1" At this point if the time of operation is the same as THURSDAY simply press the PROG/COPY button this function copies the times as set for THURS and Pastes them into FRI The control should now display "SAT PERIOD 1" Leave blank and press enter The control should now display "SAT PERIOD 2" Leave blank and press enter "SAT PERIOD 3" Leave blank and press enter The control should now display "SUN PERIOD 1" Leave blank and press enter "SUN PERIOD 2" Leave blank and press enter "SUN PERIOD 3" Leave blank and press enter The control should now display "1 TEMP 2 DATA 3 SYSTEM 4 HOLS" Now press RUN/FAN button to exit the programming screen and return the control to normal operation
When an NRG control displays “STAUS SUMMER” this would indicate that the heater has been switched off and will not turn back on again unless the Frost protection is set forces the heater on to maintain a minimum temp in the heated space To turn SUMMER MODE on or off requires the same sequence of buttons to be pressed Simply press the OVER/SUMMER button Screen should display 1 OVERRIDE MODE 2 SUMMER MODE Select option 2 This now turns SUMMER MODE on to turn off repeat the sequence as above
When required the NRG has the flexibility to give the user additional hours of operation without the need to re-programme times already set up in the memory, there may be on occasion the need to bring the heater on earlier or later e.g. if overtime for employees is required; or maybe the heating needs to be turned off for a period of time when no one is working in the heated space. Once any override hours have elapsed the control will revert back to normal operation. For example you wish to bring the heating on for 2hrs but, sometimes there may be a requirement to bring it on for a maximum of 4hrs on a Sat morning for employees; a pre-determined maximum OVERRIDE time can be set up so as not to have heating on for more than required, but in most cases the default setting is sufficient for a user’s needs For instance, on a Wednesday, your employees are working 1 hour before the heating is due to switch on Simply press the OVER/SUMMER button Screen should display “1 OVERRIDE MODE 2 SUMMER MODE” Select option 1 OVERRIDE MODE The screen should now display 2 choices “1 OVERRIDE ON 2 OVERRIDE OFF” As you require the heating to come on before a set program time select option 1 The screen displays “OVERRIDE SETTING MAXIMUM (04) Hrs 00” The number in () indicates the Max hrs you can enter Key in 02 The display should now show “STATUS OVERRIDE” And a countdown of remaining time before the control reverts back to normal operation If the need arises to turn the heater off for a few hrs during a normal day follow the example as below Simply press the OVER/SUMMER button Screen should display “1 OVERRIDE MODE 2 SUMMER MODE” Select option 1 OVERRIDE MODE The screen should now display 2 choices “1 OVERRIDE ON 2 OVERRIDE OFF” As you require the heating to go off during a set program time select option 2 The screen displays “OVERRIDE SETTING MAXIMUM (04) Hrs 00” The number in () indicates the Max hrs you can enter Key in 02 The display should now show “STATUS OVERRIDE” And also countdown of remaining time before the control reverts back to normal operation is displayed. To cancel any current Override time running Simply press the OVER/SUMMER button Screen should display “1 OVERRIDE MODE 2 SUMMER MODE” Select option 1 OVERRIDE MODE The screen should now display 2 choices “1 OVERRIDE ON 2 OVERRIDE OFF” As you require the override mode off select option 2 The screen displays “OVERRIDE SETTING MAXIMUM (04) Hrs 00” The number in () indicates the Max hrs you can enter Key in 00 The control will now return to normal operation
On new installations, the installer should always comply with wiring instructions as detailed in the ISO manual that comes with the control In most cases the main reason for a NRG control to have an intermittently scrambled or garbled screen relates to external, internal interference on the electrical circuit. It is important that the mains cables to the NRG pass through the ferrite core as supplied, to reduce the risk of electrical interference and that the interconnection control wiring terminated within the NRG does not form loops that may generate transient voltages that can give off EMF (electromagnetic fields) which may have adverse effects on the  electronic components within the NRG. See the excerpt below from the current ISO manual Another common cause of intermittent faults on NRG controls can be linked to interruptions in power supply e.g. following a power cut When the NRG screen scrambles follow the sequence below   Turn off the power supply to the control for two mins (if wired correctly to warm air heating equipment, turning off the heater would not result in the heater tripping out from overheating)   Turn the power supply back on (The control should return to normal function). If the problem persists, move on to the next step.   Turn the power supply off (if unsure contact an engineer) remove screw two covers from the top and two from the bottom   Remove screws   Remove the front of the NRG, keeping the ribbon cable attached.   Remove the battery located on the left-hand side of the PCB (approx. the size of a 10p piece).   Leave the control to stand without battery power for 15 mins   Re-fit battery   Re-fit front of control   Turn power supply back on (the control should return to normal function). If the problem persists, please move on the next step.   Contact your usual engineer for assistance, or contact us to arrange a visit from one of our engineers.
The NRG can give distribution fan control to the user in a few formats In the summer time or warm periods you may want to use the distribution fan to circulate air throughout a room This can simply be done by pressing the FAN/RUN button The control will display “SET FAN ON PRESS ENTER TO CONFIRM” Press ENTER and the distribution fan will now run Please remember the heater will not fire whilst the control is in “STATUS FAN ON” To turn the fan off and return the control to normal operation simply press the FAN/RUN button The control will display “SET FAN OFF PRESS ENTER TO CONFIRM” Press ENTER and the distribution fan will now turn off
When an NRG control displays “HEAT ON” and a heater is not coming on this would indicate that the heater as overheated and tripped out on high limit The most common cause for a warm air heater to overheat are,  Loss of power during operation this could be the result of a power cut or simply  the heater being turned off from its local isolator (always use the control to shut the heater off when not required)  Lack of ventilation around the heater (on new installations the ventilation requirements for heating equipment that is installed should always follow regulations and manufactures instructions)  Lack of ventilation around the heater (on existing installations the area around heating equipment must not be obstructed e.g. placing pallets, boxes, installation of racking can result in heating equipment overheating)  Lack of ventilation due to poor maintenance e.g. blocked vents  Lack of ventilation due to ductwork (some heaters have ductwork applied, on new installation all ductwork should be of suitable size and meet the requirements of the installed heater, fire dampers if fitted within the ductwork may have activated these should be checked along with in let air filters that may be blocked as these type of obstructions will cause nuisance over heat trips)  “Over fired” incorrect burner pressure if a heater is commissioned serviced correctly this should not occur ( remember any commissioning process, service or maintenance should only be carried out by a gas safe engineer)   Stratification (this can occur when heating equipment is installed normally at higher levels, warm air emitted from the heater rises and remains trapped in the roof void. The trapped warm air gets recirculated through the heater to a point where the heater cannot maintain a maximum temp in the heat exchanger)  Distribution fan failure (the heat exchanger requires air flow to keep cool and give required warm air for heating) All warm air heaters have an overheat reset function this is located inside or outside of the heater according to its age, it is a simple procedure to rest a warm air heater this side attention to Health and safety must be taken into account e.g. the heater may need access equipment to carry out a reset procedure and electrical circuits may be liveTURN OFF POWER SUPPLY BEFORE ATTEMPTING ANY INTERNAL RESET On the latest models, CTU and CTCU type heaters the overheat reset button is located internally see the excerpt from the current CTCU ISO manual  
  • CTU Red and Green light on the front of the heater become illuminated, if enabled the NRG will display “LOCKOUT” can be reset by pressing the RESET button on the NRG control or by pressing the Red rocker switch on the back of the heater this needs to be pressed and held down for 5sec.
  • CTCU Red rocker switch on the back of the heater becomes illuminated, if enabled the NRG will display “LOCKOUT” can be reset by pressing the RESET button on the NRG control or by pressing the Red rocker switch on the back of the heater this needs to be pressed and held down for 5sec.
  • Remember is you are unsure, please contact you maintenance engineer or contact us for an engineer to attend site.
  • MGB/MOB Indication light on the burner control box becomes illuminated, if enabled the NRG will display “LOCKOUT” Lockout reset is normally enabled if the heater is installed at high level can be reset by pressing the RESET button on the NRG control or by pressing the illuminated button on the burner in a normal floor mounted installation.