Detailed information regarding NRG controls, installation and programming heating products (Warm
Air and Radiant can be found in the download section
1 How do I check Temperature set point, heating may be off as required temp has been reached?
2 How do I check Operating times in my NRG, heating may be off as daytime program time as elapsed?
3 My NRG say’s STATUS SUMMER what does this mean?
4 I want to make my heating come on without changing my time program?
5 My NRG screen is scrambled?
6 My control say’s “LOCKOUT” what does this mean?
7 How do I get my fan to come on without my heater giving out heat?
8 My control say’s “HEAT ON” but no heat is coming out of my heater
9 What heater is best for me?
10 What fuel can I use? Can I change fuel types?
11 Fault finding guides
12
Multiple Unit Heaters one control
13
Co-Ray Vac
14
Radiant Multi burner
15
Radiant
16
Cabinets
17
Units
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Conversion kit for Pactrol ignition control
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CTCU Vertical flue conversion kit
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Honeywell fan limit stat

1
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”
To Enable Frost Protection
Selecting option 1 will turn the frost protection on which means that when the normal daytime program has finished the control will monitor the temp in the heated space and, automatically turn the heater on to maintain a minimum level as required .e.g. for stored products
Please remember there may be an increased risk of false intruder alarm trips if the heater activates outside normal working hours, as when the heater cooling fan starts up on the heater air movements may have an effect of loose objects in the environment.
Once option 1 has been selected the display will show a the current “frost protection” target temp default setting is 05°C
Simply key in the new required frost protection temp and press enter
The control should now display
“1 TEMP 2 DATA 3 SYSTEM 4 HOLS”
Now press RUN/FAN button to exit programming screen and return the control to normal operation
To Disable Frost Protection
Selecting option 2 will turn the frost protection off which means that when the normal daytime program has finished the control will not activate the heater until the next daytime program starts
The control should now display
“1 TEMP 2 DATA 3 SYSTEM 4 HOLS”
Now press RUN/FAN button to exit programming the screen and return the control to normal operation
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2
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
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3
When a NRG control displays “STAUS SUMMER” this would indicates 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
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4
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 Wed 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
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5
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 2mins (if wired correctly to warm air heating equipment, turning off the control would not result in the heater tripping out from overheating)
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Turn the power supply back on (the control should return to normal function) if the problem remains proceed to the next step
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Turn the power supply off (if unsure consult an engineer) remove screw covers 2 from the top and 2 from the bottom
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Remove screws
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Remove the front of the NRG keeping the ribbon cable attached
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Remove the battery located on the left hand side of the PCB (approx. size of a 10p)
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Leave the control to stand without power and battery for 15min
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Re-fit battery
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Re-fit front of control
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Turn power supply back on (the control should return to normal function) if the problem remains proceed to the next step
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Contact your usual heating engineer for assistance or ukservice@combat.co.uk
to arrange an engineers visit
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6
When a NRG control displays “LOCK OUT” this would indicate that the heater as missed ignition or lost flame signal during operation.
The NGR is capable of reporting and resetting Combat heating equipment if enabled through the control wiring from the heater, a lock out fault is a result of missed ignition on start up or loss of flame signal during operation.
When a NRG control displays “LOCK OUT” the heater as missed ignition or lost flame signal during operation.
A suspended warm air heater can be reset from the control as long as the wiring connection between the heater and control has been enabled
If the lock out wiring as not been connected a lock out fault can still be identified and reset on the following current heaters

CTU Red and Green light on the front of the heater become illuminated, if enabled the NRG will display “LOCK OUT” 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.
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CTCU Red rocker switch on the back of the heater becomes illuminated, if enabled the NRG will display “LOCK OUT” 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.

MGB/MOB Indication light on the burner control box becomes illuminated, if enabled the
NRG will display “LOCK OUT” 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 an normal floor mounted installation.
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7
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
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8
When a 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)
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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)
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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)
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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 tapped warm air gets re-circulated 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 live TURN 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
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On the latest models MGB and MOB type heaters the overheat reset button is located externally see the excerpt from the current ISO manual
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9
Currently there are two main types of heating manufactured and supplied by Combat HVAC these are Warm Air and Radiant Heaters for contact ukdesign@combat.co.uk
for assistance in designing your heating system
Warm Air Heaters
Warm air heaters are available in two main format types which are Units and Cabinets
Unit Heaters


CTCU GAS FIRED AVALIABLE IN G20 G25 G30 G31 GAS TYPES AND kW RANGES
Smaller compact units which are suited to smaller heated space where lower kW output is required to heat the space
CTU GAS FIRED AVALIABLE IN G20 G25 G30 G31 GAS TYPES AND kW RANGES
Larger unit which are suited to larger heated spaces where higher kW output is required to heat the space, the CTU range of heaters can be fitted to ductwork where required. Only
CTU heaters that can be ducted are referred to CTU”B” CTU”C” CTU”D”

CTU”B” (centrifugal distribution fan/s fitted) duct spigot optional air outlet or inlet

CTU”C” (centrifugal distribution fan/s fitted) duct spigot fitted on air outlet or inlet
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CTU”D” (no distribution fan/s fitted) duct spigot fitted on air outlet or inlet, fan (not supplied by Combat HVAC) will required for distribution air to be fitted in the air inlet side of ductwork


MGB GAS FIRED AVALIABLE IN G20 G25 G30 G31 GAS TYPES AND kW RANGES
Larger cabinet type warm air heater unit which are suited to larger heated spaces where higher kW output is required to heat the space, the MGB range of heaters can be fitted to ductwork where required. This type of heater is available in an External version which can be installed outside and in horizontal version which may be suspended at high level

MOB OIL FIRED AVALIABLE IN 35 SEC RED DEISEL AND 28 SEC KEROSENE OIL TYPES AND kW
RANGES
Larger cabinet type warm air heater unit which are suited to larger heated spaces where higher kW output is required to heat the space, the MGB range of heaters can be fitted to ductwork where required. This type of heater is available in an External version which can be installed outside and in horizontal version which may be suspended at high level

Radiant Heaters

BH GAS FIRED AVALIABLE IN G20 G25 G30 G31 GAS TYPES AND kW RANGES
Radiant tube heater suited to a wide range of installation applications from local spot heating to larger installations where by when installed as a zoned group will give heat over a larger floor surface area available in U-TUBE, LINEAR, AND DOUBLE LINEAR formats

BH RADIANT U-TUBE

BH LINEAR RADIANT TUBE


BH DOUBLE LINEAR RADIANT TUBE

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Radiant Heaters BH Multi-burners

U-Tube and Linear heaters can be joined to a common flue duct to give zone heating over a larger area
Radiant Heaters Co Ray Vac
Similar to a multi burner arrangement but burners run in a continuous arrangement to one common outlet pump

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Combat warm air, and Radiant gas fired equipment can run on G20 G25 G30 and G31 only
Combat warm air oil fired equipment can run on 28sec Kerosene and 35sec class D oil
Heaters fuel type can be converted on site if required
Radiant
Injector change, settings, and new data plate are required for conversion between gases, once completed the heater will require a full commission to ensure safe and correct operation.
Warm air CTCU
Injector change, settings, and new data plate are required for conversion between gases, once completed the heater will require a full commission to ensure safe and correct operation.
Warm air CTC
Injector change, settings, and new data plate are required for conversion between gases, once completed the heater will require a full commission to ensure safe and correct operation.
Warm air MGB
Conversion Kit, settings, and new data plate are required for conversion between gases, once completed the heater will require a full commission to ensure safe and correct operation.
Warm air MOB
New nozzle, settings, and new data plate are required for conversion between gases, once completed the heater will require a full commission to ensure safe and correct operation.
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Undamaged Damaged
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Fault finding guides
The fault finding guides are excerpts from the current ISO manuals, guides relating to faults that may occur on the different types of equipment as supplied by Combat HVAC ltd full current manuals are available to download from the Downloads section. Along with back issues for older types of heaters that can be found in the field.
.

MGB/MOB 14.1

MOB 14.2

MGB 14.3

MGB/MOB 14.4

MGB/MOB 14.5

MGB/MOB 14.6

MGB/MOB 14.7

CTCU 15.1

CTCU 15.2

CTCU 15.3

CTCU 15.4

CTCU 15.5

CTU 16.1

CTU 16.2

CTU 16.3

CTU 16.4

BH 16.1 General U-Tube & Linear

BH 16.2 General Multi-Burner

CRT 16.1 General Multi-Burner

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