Powrmatic ErP NVS 30, ErP NVS 60, ErP NVS 90, ErP NVS 140 User, Installation & Servicing Manual
Page 1
Doc Ref: M102 Issue 2.4 May 2018
NVS Condensing Gas Unit Heater
Industrial & Commercial Heating Systems
User, Installation
& Servicing Manual
www.powmatic.co.uk
+44 (0) 1460 53535
info@powrmatic.co.uk
Page 2
Certificate of Guarantee
Dear Customer
This is to certify that this heater is guaranteed for two years parts and one year labour from the date
of original commissioning. The heater must be commissioned within 4 weeks of installation.
To make a claim
In the rst instance you must contact your appliance supplier, or installer and provide:-
1. The appliance type and serial number.
2. The original commissioning documentation. As much detail as possible on the fault.
3. Your supplier, or installer, will then contact Powrmatic to make a guarantee claim on your behalf.
Conditions of Guarantee
1. The heater must have been installed by a competent recognised installer, and in
accordance with the manufacturer’s instructions, building regulations and local regulations.
2. The heater has been professionally commissioned, within 4 weeks of installation, and a copy of
the commissioning sheet returned to Powrmatic.
3. The heater has been maintained on a yearly basis by a competent servicing company.
4. The heater has been used in accordance with the manufacturer’s instructions.
5. The correct specication fuel has been used.
6. No unauthorised repairs of modications have been made. Powrmatic ‘General Conditions of
Sales’ have been observed.
7. Except for the obligation of Powrmatic Ltd to perform warranty repairs during the guarantee
period Powrmatic will not be liable in respect of any claim for direct or indirect consequential
losses, including loss of prots or increased cost arising from loss of use of the heater, or any
event arising there from.
Exclusions
Consumables such as gaskets, ignition electrodes, ame rectication electrodes, drive belts, fusible
links, control batteries are all excluded from guarantee.
----------------------------------------------------
Powrmatic Ltd, Hort Bridge, Ilminster, Somerset, TA19 9PS
Tel: 01460 53535 Fax: 01460 52341
Web: www.powrmatic.co.uk e-mail: warranty@powrmatic.co.uk
Important: This certicate
must be kept with the appliance
Failure to provide a copy of the commissioning sheet invalidates the heater warranty
Installer
Date:________________Signed: _____________________________________Installer
Commissioned
Date:________________Signed:_______________________Commissioning Engineer
page no. 2 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Page 3
Dear Customer - thank you for choosing Powrmatic.
We appreciate you buying one of our high quality products and know that you have made the best
choice. By choosing Powrmatic, you are investing in UK manufacturing & its workforce. We pride
ourselves by manufacturing products that provide clean, comfortable and safe working environments
worldwide together with the personal & professional service and back-up you deserve. If you have
any questions or concerns regarding this product, please contact our Technical Support Team by
calling 01460 53535.
Users, Installation and Servicing Instructions
CONTENTS
Title Section Contents Page
User Instructions 4
Pre Installation
1.1 Introduction 5
Duties 6
Dimensions 7
1.2 Technical data 9
1.3 General Requirements 10
Installation
2.1 Fitting the unit 14
2.2 Flue/Combustion Air Duct System 16
2.3 General Identication of Electrical Items 19
2.4 Electrical Cable Installation 19
2.5 Wiring Diagrams 21
2.6 Commissioning and Testing 23
2.7 Servicing 27
Additional Documents
3.1 Short List of Parts 30
3.2 Gas Conversion 32
Appendices
Information required for ecodesign (ErP) Directive 2009/125 34
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
page no. 3 of 36
Page 4
User Instructions
If the heater has not been left operational
proceed as follows.
A) Checks before lighting the Air Heater
The following preliminary checks should be made before
lighting the heater(s)
a) Ensure that the ELECTRICAL supply to the heater is
switched OFF.
b) Check that all warm air delivery outlets are open.
c) Check that the thermostat is set at MAX.
d) Check that the clock control is set to an ON period.
e) Check that any other controls are calling for heat.
B) Lighting the Air Heater
1. Switch on the electrical supply at the isolator
2. If the Red Limit indicator light at the front of the heater is
illuminated, press the limit interlock reset switch at the side
of the lamp.
3. The startup sequence will commence.
4. If the burners fail to light the control box will
automatically restart the ignition sequence. If after 5
attempts at ignition the burners have still failed to light
the control box will go to lockout and the Red lockout light
inside the heater (or on the low level remote reset, MC200
or Powrtrol RR if tted) will be illuminated. To restart the
ignition sequence depress the reset button for about 1-2
seconds.
WARNING: If it is not possible to light the
heater after several attempts, contact the
installer or local service company.
C) To Shut Down the Air Heater
1) For Short Periods:
Turn the room thermostat to the OFF, or set to it’s lowest
setting.
D) Description of Operation
Important: The heater must NOT be
controlled by switching ON and OFF the
main electrical supply to it.
1) Standard Units
The ignition sequence commences each time the external
controls e.g. Time clock, room thermostat etc. call for
heat. The internal exhaust fan will run and, when sucient
combustion airow is proved by the air pressure switch, the
ignition spark will be generated, the main gas valve opens
and the burners light. The heater fan will automatically
start approximately 0 - 30 seconds (depending on the
setting of the internal timer) after the burners light. When
the external controls are satised the burners will be
turned o and approximately 2 - 3 minutes later the heater
fan will be automatically stopped. If the burners fail to light
the control box will make another four attempts at ignition.
2) High / Lo & Modulating Units
When the burners are alight, the heat output will be
controlled either to high re or low re or, in the case of
modulating units, to any point between high and low re;
depending on the requirements of the space being heated
and the external controls tted.
3) Summer / Winter Modes
Certain types of external controls will provide for two
modes of operation i.e.
Summer: The heater fan alone will run at the dictate of the
external controls to provide air movement.
Winter: The heater will operate normally.
4) Overheat Thermostat
This operates if high temperatures within the heater are
detected, the burners are turned o and a Red indicator
switch light on the front panel is illuminated. The fault
condition must be identied and rectied and the
thermostat manually reset. The thermostat is located
next to the indicator light and unscrewing the cover cap
exposes the reset button which can then be depressed.
2) For Long Periods:
Complete step 1 above. Wait for 5 minutes and then turn
OFF the electrical supply at the isolator.
page no. 4 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Note: The limit thermostat(s) can only be reset
once the unit has cooled down.
Unless the cause of the fault condition is
readily obvious, for example a power cut whilst
the heater was operating, a service engineer should be
contacted.
Page 5
E) Maintenance
To maintain ecient, reliable and safe operation of the
heater it must serviced by a qualied person at least
annually and preferably at the end of the heating season.
F) IMPORTANT
Free access must be maintained to and around the heater
for servicing purposes and the air supply to the heater
must not be restricted in any way. Combustible materials
must not be stored adjacent to the heater.
If at any time a gas leak is suspected, turn OFF the gas
supply at the meter and contact the local gas undertaking
immediately.
to service unless you are a competent person in the eld of
Gas and Electrical work.
If you have any safety questions reference the servicing
and installation of any of our heaters please do not hesitate
to contact our head oce for expert advice. Your safety is
paramount to us.
Gas Safety (Installation & Use) (Amendment)
Regulations
It is law that all gas appliances are
installed, adjusted and, if necessary,
converted by qualied persons* in
accordance with the current issue of the
above regulations. Failure to install appliances
correctly can lead to prosecution. It is in your own
interests and that of safety to ensure that the law is
complied with.
All Powrmatic heaters use gas and electricity to power
them, they may also contain moving parts such as pulleys
and belts. It would be hazardous to tamper with or attempt
1.1 Introduction
The NVS range are highly ecient, fully condensing, gas
red, fanned circulation air heaters that cover heat outputs
of 30kW to 140kW, have a closed combustion circuit and
are supplied complete with a ue system. They are certied
for use on Natural Gas, Group H - G20, and Propane - G31
only. Appliance Categories are Cat II2H3P (GB, IE).
The heaters are designed to be suspended from suitable
roof points or alternatively to be mounted on purpose
designed brackets and are intended primarily for heating
commercial or industrial premises. All variants are for
internal use only.
NVS heaters feature a closed combustion circuit and have
an internal exhaust fan, mounted downstream of the
heat exchanger, to evacuate the products of combustion
and draw in air for combustion. The air heater must be
connected to a ue system that is approved by Powrmatic
Ltd.
* An approved class of person listed on the gas safe
register.
are for use in air handling units. NVS units are not suitable
for siting externally.
Heaters are tted as standard with inshot burners, a fully
automatic control for ignition, ame sensing, gas supply
control and safety functions, an internal exhaust fan, main
air fan (/F and /C models), and fan/limit thermostat.
Options include High/Low or Modulating burner controls,
inlet duct connection, outlet duct connection, 30°, 45°
head, 90° outlet bend, vertical/horizontal outlet louvre
assembly and a full range of modular duct components.
IMPORTANT
Service and Maintenance Engineers shall
ensure that replacement items are tted,
adjusted and set in accordance with the
data and detail set out in these instructions. If in doubt
consult Powrmatic Technical Department.
They may be used where the atmosphere inside the
premises could be contaminated e.g. Dust, oil mist etc. but
the heaters are not airtight and therefore may not be used
in areas classied as hazardous as dened in BS 5345: Part 2
or areas subjected to signicant negative pressures due to
extract systems.
NVS/F heaters have an axial fan assembly tted at the rear
to circulate the air being heated through the formed tube
heat exchanger. NVS/C units are supplied with a centrifugal
fan and NVS/D units for use with ducted systems where the
air moving fan is by others or a centrifugal fan section is
used adjacent to or remote from the heater. NVS/DH units
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Gas Safety (Installation & Use) Regulations 1998
It is law that all gas appliances are
installed, adjusted and, if necessary,
converted by qualied persons* in
accordance with the current issue of the
above regulations. Failure to install appliances
correctly can lead to prosecution. It is in your own
interests and that of safety to ensure that the law is
complied with.
* An approved class of person listed on the gas safe
register.
page no. 5 of 36
Page 6
Duties
Model 30 60 90 140
Output kW 30 60 90 140
Input (nett CV) kW 29.02 59.22 86.74 137.95
Volume (All Models) m
Airflow
Throw NVS F m 24 25 31 37
Fan Static
Supply
NVS C Pa 250 250 200 285
Standard V/ph/Hz 230/1/50
Optional V/ph/Hz 415/3/50
Motor kW 0.39 0.66 2 x 0.39 2 x 0.66
Electrics
NVS F
Start amp 3.76 5.5 5.0 10.6
Run amp 1.70 2.4 2.3 5.3
Motor kW 1.10 1.40 2 x 1.10 2 x 1.40
NVS C
Start amp 18.50 28.90 31.0 40.0
Run amp 6.40 9.50 12.80 17
Connection BSP/Rc ¾”
Nat Gas mbar 17.5
LPG mbar 37.0
Nat Gas m
LPG m
Min m 2.50 3.00
Max m 3.00 5.00
Fuel
Mounting
Height
Minimum Inlet
Pressure
Consumption
NVS F
Height mm 818 818
Overall
Dimensions
NVS F
Width mm 1050 1345 2345 2345
Depth mm 1187 1204 1187 1204
Top mm 200
Installation
Clearances
NVS
LH Side mm 200
RH Side mm 1000
Rear mm 600
Connection mm 15 15 15 15
Condensate
Output
Natural Gas l/h 2.3 3.4 6.0 8.8
Propane l/h 1.2 1.7 3.0 4.4
Diameter mm ø 100 130
Flue
Maximum Length
Flue Only m 12
Room Sealed m 6
Combustion Air Spigot mm ø 100 130
Noise Level dB(A) 54 62 66 67
Nett Weight
NVS F kg 124 177 245 350
NVS C kg 195 252 384 514
3
/s 0.78 1.56 2.34 3.64
3
/h 3.07 6.26 9.17 14.60
3
/h 1.21 2.42 3.55 5.64
705 1035
Notes –
Fuel consumption and output figures based upon nett calorific values as follows
- Natural gas (G20) nett CV 34.02 MJ/m³
- Propane (G31) nett CV 88.00 MJ/m³
• Heaters have efficiency levels which meet with the minimum efficiency requirements of UK PartL2B Building Regulations
• Heaters have efficiency levels which meet the criteria of the Enhanced Capital Allowance Scheme (Excluding NVS30)
• Air handling data is assessed at room ambient conditions
• Throw figures provide the distance to the point where the terminal velocity degrades to 0.25 m/s
• Dimensions and clearance data in table above refer to NVS F units only.
• Condensate rates are approximate and for when heaters are working at maximum output.
• Noise levels are applicable to standard NVS F models and are measured 5m from appliance and in free field conditions
• Motor kW, run and start amps apply to standard electrical supply as stated. For optional data contact sales office
• Connection of combustion air duct is not required for ‘flue only’ applications.
page no. 6 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Page 7
P
Y
N
X
GAS ENTRY POINT
CONDENSATE DRAIN POINT
FRONT VIEW
PLAN VIEW
R/H SIDE VIEW
GAS ENTRY POINT
REAR VIEW
C
A
B
Q
ØD
G
F
P
N
122
394
394
M
K
J
H
SUSPENSION POINTS M10
P
Dimensions
NVS F - Axial Fan Crossow Units
NVS 30 & 60
ØD
G
C
P
A B
FRONT VIEW
M
K
NVS 90 & 140
PLAN VIEW
J
394
394
122
H
R/H SIDE VIEW
SUSPENSION POINTS M10
Q
Detailed View Of Gas Entry Point & Condensate Drain Point
GAS ENTRY POINT
F
N
REAR VIEW
Model X Y
30/60 280 90
90/140 280 65
C
ØD
G
GAS ENTRY POINT
F
N
A
FRONT VIEW
REAR VIEW
K
B
R/H SIDE VIEW
PLAN VIEW
J J
Q
SUSPENSION POINTS M10
M
394
394
122
H
Model A B C D F G H J K M N P Q
NVS-F 30 1050 1031
818
100 552
142
347 445 258 201 144 225 156
NVS-F 60 1345 1031 818 130 475 220 347 740 258 201 144 301 173
NVS-F 90
NVS-F 140 2345 1031
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
2345
1031 705 130 356 220 347 870 258 201 88 237 156
1035
130
686
220 347 870 258 201 88 147 173
page no. 7 of 36
Page 8
NVS C - Centrifugal Close Coupled Fan Units
P
Y
N
X
GAS ENTRY POINT
CONDENSATE DRAIN POINT
FRONT VIEW
PLAN VIEW
R/H SIDE VIEW
GAS ENTRY POINT
REAR VIEW
C
A B
63
ØD
G
F
P
N
122
394
394
M
K
J
H
SUSPENSION POINTS M10
63
L
S
R
T
P
Y
N
X
GAS ENTRY POINT
CONDENSATE DRAIN POINT
C
ØD
G
GAS ENTRY POINT
F
P
T
A B
FRONT VIEW
63
R/H SIDE VIEW
L
63
N
REAR VIEW
S
R
Detailed View Of Gas Entry Point & Condensate Drain Point
M
SUSPENSION POINTS M10
PLAN VIEW
K
J
394
394
122
H
Model X Y
30/60 280 90
90/140 280 65
Model A B C D F G H J K L M N P R S T
NVS-C 30 1050 1031
NVS-C 60 1345 1031 818 130 475 220 347 740 258 1589 201 144 301 1010 940 748
2345
1031 705 130 356 220 347 870 258 1589 201 88 237 2014 1944 635
NVS-C 90
NVS-C 140 2345 1031
NVS D - Ducted Heat Module Units (No fan)
818
1035
100 552
130
142
347 445 258 1589 201 144 225 696 626 748
686
220 347 870 258 1664 201 88 147 2014 1944 965
ØD
C
FRONT VIEW
PLAN VIEW
K
A B
J
H
63
R/H SIDE VIEW
M
SUSPENSION POINTS M10
394
394
122
63
Detailed View Of Gas Entry Point & Condensate Drain Point
G
GAS ENTRY POINT
F
P
N
REAR VIEW
S
R
T
Model X Y
30/60 280 90
90/140 280 65
Model A B C D F G H J K M N P R S T
NVS-D 30 1050 1031
818
100 552
142
347 445 258 201 144 225 696 626 748
NVS-D 60 1345 1031 818 130 475 220 347 740 258 201 144 301 1010 940 748
NVS-D 90
NVS-D 140 2345 1031
page no. 8 of 36
2345
1031 705 130 356 220 347 870 258 201 88 237 2014 1944 635
1035
130
686
220 347 870 258 201 88 147 2014 1944 965
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Page 9
1.2 Technical Data
Injector Sizes & Burner Pressures - Natural Gas - Group H - G20 Net CV (Hi = 34.02MJ/m³)
High Fire Low Fire
Injectors
MODEL No. Size (mm)
Burner
Pressure
Marked mbar m³/h mbar m³/h
Gas Rate
Burner
Pressure
Gas Rate
NVS30 6 1.94 194 10.0 3.07 3.3 1.67
NVS60 8 2.54 254 8.3 6.26 2.6 3.46
NVS90 6 3.5 350 8.2 9.17 2.8 5.40
NVS140 10 3.5 350 7.9 14.60 2.3 8 .17
Injector Sizes & Burner Pressures - Propane G31 Net CV (Hi = 88.00MJ/m³)
High Fire Low Fire
Injectors
MODEL No. Size (mm)
Burner
Pressure
Marked mbar m³/h mbar m³/h
Gas Rate
Burner
Pressure
Gas Rate
NVS30 6 1.25 125 26.5 1.21 7.6 0.65
NVS60 8 1.55 155 20.0 2.42 7.4 1. 34
NVS90 6 2.1 210 24.0 3.55 8.4 2.08
NVS140 10 2.10 210 22.6 5.64 6.9 3.16
Electrical Loadings - 1Pha
Nominal Inlet
Pressure = 20mbar
Minimum Inlet
Pressure = 17.5mbar
Nominal Inlet
Pressure = 37mbar
Minimum Inlet
Pressure = 37mbar
Motor
MODEL
NVS30
NVS60
NVS90
NVS140
kW
0.39 930 1.8 3.76 1.7 3 1.1 900 9.8 18.5 6.4 7
0.66 860 3.0 5.5 2.8 5 1.4 930 10.0 28.9 9.5 16
2 x 0.39 930 2 x 1.8 5.0 2.3 5 2 x 1.1 900 2 x 8.0 31.0 12.8 16
2 x 0.66 860 2 x 3.0 10.6 5.3 7 2 x 1.4 900 2 x 10 40.0 17.0 20
Heater Specications
Input
(Nett)
MODEL
NVS30
NVS60
NVS90
NVS140
F
29.02 30.0 15.78 15. 2 0.7804 2809
C 250 1.1 n/a 195
F
59.22 60.0 32.72 32.29 1.5608 5618
C 250 1.4 n/a 252
F
86.74 90.0 51.00 52.53 2. 3412 8428
C 200 2 x 1.1 n/a 384
F
137.95 140.0 77.26 76.64 3.6418 13110
C 285 2 x 1.40 n/a 514
/F Models /CCF Models
Nominal
Motor
R. P.M .
High Fire Low Fire
kW kW m³/s m³/h Pa kW dB(A) kg
Output
Rated
Amps
(A)
Start
Amps
Input
(Nett)
(A)
Run
Amps
(A)
Output
Fuse
Rating
(A)
Air Volume
Motor
kW
Nominal
Motor
R. P.M .
Maximum
Resistance
Duct
Rated
Amps
(A)
Motor
Fan
Start
Amps
(A)
Amps
Noise
Level
n/a 0.39 54 124
n/a 0.66 62 176.5
n/a 2 x 0.39 66 245
n/a 2 x 0.66 67 350
Run
(A)
Fuse
Rating
(A)
Weight
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
page no. 9 of 36
Page 10
1.3 General Requirements
1.3.1. Related Documents
The installation of the air heater(s) must be in accordance
with the rules in force and the relevant requirements of the
Gas Safety Regulations, Building Regulations and the I.E.E.
Regulations for Electrical Installations. It should also be in
accordance with any relevant requirements of the local gas
region, local authority and re authority and the relevant
recommendations of the following documents.
Institution of Gas Engineers & Managers
IGE/UP/1 (Ed.2) Strength and tightness testing and
purging of industrial and commercial gas installations.
IGE/UP/1A Soundness testing and direct purging of small
low pressure industrial and commercial gas installations.
IGE/UP/2 Gas installation pipe work, boosters and
compressors on industrial and commercial premises.
IGE/UP/10 (with Amendments October 2010) Installation
gas appliances in industrial and commercial premises.
British Standards Code of Practice
BS 5588 Fire precautions in the design and construction of
buildings.
Part 2 : 1985 Code of Practice for Shops
Part 3 : 1983 Code of Practice for Oce Buildings
BS 6230 Installation of Gas Fired Forced Convection Air
Heaters for Commercial and Industrial Space Heating.
Those appliances having a gross input rating not exceeding
60kW viz. NVS30 and installed to take their combustion air
from within the building must be installed in accordance
with the relevant recommendations of the following
document.
BS 5440 Flues and Air Supply for gas appliances of rated
input not exceeding 60kW (1st and 2nd family gases), Part
2 – Air Supply
For NVS30/D units, reference should also be made to:
BS 5864 Code of Practice for installation of gas-red
ducted-air heaters of rated input not exceeding 60kW.
Electromagnetic Compatibility (EMC)
These heaters pass the following standards for
Electromagnetic Compatibility: EN 61000-6-3:2007 A1
(Generic Emissions for Residential, Commercial and Light
Industrial Environments) and EN 61000-6-2:2005 (Generic
Immunity for Industrial Environments).
1.3.2 Location
Powrmatic NVS units are designed to operate within an
ambient temperature range of -10 to 25°C.
NVS heaters can be installed in several ways: i) suspended
from ‘drop rods’ via purpose designed M10 suspension
xing points on the heater, ii) attached to our optional
wall support brackets or iii) positioned on a level, noncombustible base. In all cases, it is important that all
supporting structures have been assessed with regard to
the relevant weight loadings.
Consideration should be given to ue routes and points of
exit, condensate, gas, electrical and control connections.
Consideration should also be given to the throw
characteristics of the heater, issues of public access and
siting of environmental control stations and/or remote
temperature sensors where the position needs to be
representative of the zone temperature to which they refer.
Where the location of the air heater is such that it might
suer external mechanical damage e.g. from overhead
cranes, fork lift trucks, it must be suitably protected.
Heaters should not be installed in hazardous areas or areas
where there is a foreseeable risk of ammable or corrosion
inducing particles, gases or vapours being drawn into the
combustion air or main fan circuits.
Areas where special consideration or advice may be
required could include but is not limited to –
• Where de-greasing solvents are present, even in
minute concentrations
• Where paint spraying is carried out
• Where styrenes or other laminating products are
used
• Where airborne silicone is present
• Where petrol engine vehicles are stored or main
tained
• Where dust is present (i.e. wood working or
joinery shops)
• Where high levels of extract persist
Installation in such areas may be possible under specic
conditions. Please consult our Technical Department for
further information.
1.3.2.1 Sizing of the heater
The heater should be correctly sized for the area that it is
heating, Full calculations need to be preformed to ensure
the correct KW output heater is tted (CIBSE elemental
methodology can be used, or the Powrmatic Technical
Department can provide guidelines).
page no. 10 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Page 11
1.3.3 Electrical Supply
1.3.5 Flue System
Wiring external to the air heater must be installed in
accordance with the I.E.E. Regulations for Electrical
Installations and any local regulations which apply.
All standard heaters are supplied by 230V - 1ph, 50Hz. The
method of connection to the main electricity supply must:-
- facilitate the complete electrical isolation of the unit(s)
- be in a readily accessible position adjacent to the unit(s)
- serve only the unit(s)
- have a contact separation of at least 3mm in all poles. See
the accompanying wiring diagram for the heater electrical
connections
NVS/C and fan/silencer units can also be supplied for 400V
3N, 50Hz.
1.3.4 Gas Supply
A servicing valve and union to facilitate servicing must
be tted to the gas inlet pipe work of the heater. The gas
supply must be completed in solid pipe work and be
adequately supported. Heaters suspended by drop rods,
straps or chains must have a exible connection as the
nal link between the gas supply pipe work and the heater.
Sucient slack must be left in the connection to take
account of normal movement of the heater.
Warning
When completing the nal gas connection
to the heater do not place undue strain on
the gas pipe work of the heater.
NVS units feature a closed combustion circuit and have an
internal exhaust fan, mounted downstream of the heat
exchanger, to evacuate the products of combustion and
draw in air for combustion.
The air heater must be connected to the ue system that is
provided by Powrmatic Ltd. Several congurations of ue
and combustion air ducts are available.
The ue must terminate in a freely exposed position and
be sited to prevent the products of combustion entering
any opening in a building in such concentration as to be
prejudicial to health or a nuisance
Type B22 Installation.
Combustion air entry
(fitted with inlet grille and
inlet bend (not shown))
1.3.4.1 Service Pipes
The local gas undertaking should be consulted at the
installation planning stage in order to establish the
availability of an adequate supply of gas. An existing
service pipe must not be used without prior consultation
with the local gas undertaking. The inlet gas pressure
under running conditions must not be less than 17.5mb.
1.3.4.2 Meters
An existing meter should be checked, preferably by the gas
undertaking, to ensure that the meter is adequate to deal
with the total rate of gas supply required by all connected
equipment.
1.3.4.3. Installation Pipes
Installation pipes should be tted in accordance with IGE/
UP/2. Pipe work from the meter to the air heater must be
of adequate size. Do not use pipes of a smaller size than
the inlet gas connection of the heater. The complete
installation must be tested for soundness as described in
the above Code.
Type C32 Installation.
Combustion air entry
(fitted with inlet grille and
inlet bend (not shown))
Combustion
air socke t
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
page no. 11 of 36
Page 12
Type C12 Installation.
Combustion
air socket
1.3.6 Ventilation Requirements
Type B ued installations.
Where NVS heaters are installed within the heated space
(ie not in a plant room or an enclosure) and having
a building design air change rate of greater than 0.5/h,
additional provision for ventilation is not required.
If the building design air change rate is less than 0.5/h,
additional provision for natural or mechanical ventilation
is required. These being:
Natural Ventilation:
Grilles having a free area of at least 2cm² per kW of rated
heat input shall be provided at low level i.e. below the level
of the heater ue connection.
Mechanical Ventilation:
Must ensure that the space air change rate is at least 0.5/h,
must be of the ‘input’ type and interlocked to ensure the
heaters cannot work if the input system is not working.
Type B ued installations.
Where NVS heaters are installed in a plant room
or an enclosure (ie not within the heated space)
having combustion air drawn directly from the room
and connected to a ue that evacuates the products of
combustion directly from the room additional provision for
natural or mechanical ventilation is required. These being:
Natural Ventilation:
There must be permanent air vents communicating
directly with the outside air, at high level and at low level.
Plant Rooms
Low level (inlet) 4cm²/kw of total rated net heat input
High level (outlet) 2cm²/kw of total rated net heat input
Enclosures
Low level (inlet) 10cm²/kw of total rated net heat input
High level (outlet) 5cm²/kw of total rated net heat input
Mechanical Ventilation:
The minimum ow rate of ventilation shall be 4.14m³/h per
kilowatt of total rated heat input.
Type C ued installations.
Where NVS heaters are Installed within the heated
space (ie not in a plant room or an enclosure) having
combustion air ducted to the appliance and combustion
products ducted to the outside air, NO additional
provision for the supply of either combustion air or for
combustion products dilution or additional provision
for the supply of air is necessary.
Type C ued installations.
Where NVS heaters are Installed in a plant room or
an enclosure (ie not within the heated space) having
combustion air ducted to the appliance and combustion
products ducted to the outside, air vents shall be provided
and be permanently open.
To room or internal space
Low level (inlet) 10cm²/kw of total rated net heat input
High level (outlet) 10cm²/kw of total rated net heat input
Direct to outside air
Low level (inlet) 5cm²/kw of total rated net heat input
High level (outlet) 5cm²/kw of total rated net heat input.
Type C
12 or C32 Installation (these refer to section 2.2
of these instructions)
Air vents shall be permanently open.
Figures are for heaters in plant rooms or enclosures ONLY
In all cases gures are per heater installed.
For multi heater installations the appropriate values for each heater
must be added together.
In the
heated
space
Free area
grille cm²
Ventilation is to a
room or internal
space
Low level
grille. Free
area cm²
High level
grille. Free
area cm²
Ventilation is to a
outside air
Low level
grille. Free
area cm²
High level
grille. Free
area cm²
NVS
Input
kW
Type B22 Installation (these refer to section 2.2 of these
instructions)
Air vents shall be permanently open.
In all cases gures are per heater installed.
For multi heater installations the appropriate values for each heater
must be added together
In the
heated
space
Low level
grille. Free
area cm²
In a plant room,
ventilation to
outside
Low level
grille. Free
area cm²
High level
grille. Free
area cm²
In an enclosure,
ventilation to
outside
Low level
grille. Free
High level
grille. Free
area cm²
area cm²
30 29.02 58.0 116.0 58.0 290.0 145.0 n/a 290.0 290.0 145.0 145.0
60 59.22 118.4 236.8 118 .4 592.2 296.1 n/a 592.2 592.2 296.1 296.1
90 86.74 173.5 295.0 173.5 867.4 438.2 n/a 867.4 867.4 438.2 438.2
140 137.95 275.9 551.8 275.9 1379.5 689.8 n/a 1379. 5 1379. 5 489.8 489.8
page no. 12 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Page 13
1.3.7 Air Distribution System
should be suitably lined with a re-resisting material.
Where single NVS/F units are required to cover a large oor
area, and in buildings with high roof or ceiling heights
Calecon thermal economiser units should be tted to
ensure even heat distribution and minimise stratication.
Care should be taken to avoid impeding the air throw with
racking, partitions, plant or machinery etc. Various outlet
congurations are available as optional extras to modify
the air throw pattern to suit particular site conditions.
For ducted units all delivery and return air ducts, including
air lters, jointing and any insulation or lining must be
constructed entirely of materials which will not contribute
to a re, are of adequate strength and dimensionally stable
for the maximum internal and external temperatures to
which they are to be exposed during commissioning and
normal operation.
Where inter-joist spaces are used as duct routes they
1.3.7.1 NVS C Ducting Requirements
Model Air Volume m³/h
Maximum Duct
Resistance Pa
A full and unobstructed return air path to the air heater(s)
must be provided.
If the air heater(s) is installed in a plant room the return air
intake(s) and the warm air outlet(s) from the heater(s) must
be fully ducted, into and out of the plant room to avoid
interference with the operation of the heater.
The openings in the structure of the plant room through
which the ducting passes must be re stopped.
Care must be taken to ensure that return-air intakes are
kept clear of sources of smells and fumes, and where there
is any possibility of pollution of the air by dust, shavings
etc., precautions must be taken to prevent contamination.
If necessary suitable barrier rails should be provided to
prevent any combustible material being placed within
900mm of the outlets.
NVxCCF heater unit
NVS C
heater unit
NVS30C 2808 250
NVS60C 5616 250
NVS90C 8424 200
NVS140C 13104 285
1.3.7.2 NVS D Pressure Drop Across Heat Exchanger
250
NVS 60
200
150
NVS 30
100
Pressure Drop (Pa)
NVS 90
NVS 140
50
0
0
1
2 3 4
5
6
Air Volume (m³/s)
7 9
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
8
10 11 12
page no. 13 of 36
Page 14
2.1 Fitting the Unit
C
B
A
Front View
D D
E
Distance from outside of heater to closest obstacle Distance
R/H Side Views
A RHS Clearance (when viewed at front of heater) mm 1000
B LHS Clearance (when viewed at front of heater) mm 200
C Top of heater mm 200
D Rear of heater (dependent on ue system) mm 600
NVS30F - 40F mm 2500-3000
E Recommended mounting heights (oor level to underside of unit)
For multi air heater installations the following minimum distances between units must be observed
Between units, side to side mm 3000
Between units, back to back mm 3000
page no. 14 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
NVS60F - 140F mm 3000-5000
NVS D mm N/A
Page 15
2.1.1 General
Before installation, check that the local distribution
conditions, nature of gas and pressure, and adjustment of
the appliance are compatible.
The air heater must be installed in accordance with
the rules in force and the relevant requirements of any
re regulations or insurance company's requirements
appertaining to the area in which the heater is located,
particularly where special risks are involved such as areas
where petrol vehicles are housed,
reducing noise levels is important the heater should be
insulated from the structure by installing it on suitable
anti-vibration mountings. In all such cases and when the
heater is suspended it is essential that all gas, duct, and
electrical connections to the heater are made with exible
connections to maintain continuity of connection.
2.1.4 Air Distribution System
2.1.4.1 General
Where cellulose spraying is carried out, in wood working
departments etc.
NVS/C units are supplied with a centrifugal fan.
2.1.2 Fitting space requirement
For NVS/D units the normal air ow direction is from right
to left when viewing the heater from the burner/controls
end with the fan unit upstream.
The minimum clearances must be observed for installation
and servicing.
Any combustible material adjacent to the air heater and
the ue system must be so placed or shielded as to ensure
that its temperature does not exceed 65 °C.
When NVS modular components are used in conjunction
with the heater each component must be individually
supported.
2.1.3 Suspending the heater
The air heater may be installed either:
a) suspended from suitable vertical drop rods.
b) on specically designed cantilever brackets from a non
combustible wall.
c) on a level noncombustible surface. The surface must not
extend past the front edge of NVS/F heaters.
The method of installation must be capable of adequately
supporting the weight of the unit (See section 1.2) and
any ancillary equipment. Before installing the heater the
existing structure must be inspected to ensure it is suitable.
All supports should be protected against the eects of rust
or corrosion.
Raise the heater up to the point of installation using
suitable and safe means and connect to the means of
suspension.
NVS/D and NVS/C models are designed for use with duct
work to more precisely dene the point of air delivery,
and /or provide ducted return air or ducted fresh air inlet.
All ducting must be independently supported of the air
heater.
Joints and seams of supply ducts and joints between NVS
ancillary components must be securely fastened and made
airtight using appropriate sealants or sealing strips. If
required the duct work should be insulated to reduce heat
loss.
2.1.4.2 Noise Reduction
Ducting should be connected to the heater spigots via
an airtight exible coupling of noncombustible material.
Before tting the coupling it must be ensured that a
minimum clearance of approximately 15mm will be
maintained between the ends of the ducting and the
heater spigots.
Sound attenuators may be tted in inlet and outlet ducts
to reduce airborne fan noise. Materials used in outlet
sound attenuators must be capable of withstanding 100°C
air temperature without any deterioration.
2.1.5 Room Thermostat Siting
The room thermostat should be tted at a point which
will be generally representative of the heated area as
far as temperature is concerned. Draughty areas, areas
subjected to direct heat e.g. from the sun, and areas where
the air movement is relatively stagnant e.g. in recesses,
should be avoided. The thermostat should be mounted
approximately 1.5m from the oor.
Any room thermostat, frost thermostat, time clock etc.
must be suitable for switching 230V, 5A and must be of the
'snap action' type to minimise contact bounce.
For electrical connections of external controls see the
accompanying wiring diagram.
Threaded drop rods must have lock nuts tted that are
tightened down onto the 10mm xings in the heater. If
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
page no. 15 of 36
Page 16
2.2 Flue/Combustion Air Duct System
The minimum distance between surfaces of the ue pipe
and any surfaces made from combustible materials is
300mm.
If it is necessary for the ue pipe to pass through a
structure made from combustible materials a metal sleeve
must be used so that the minimum clearance of 300mm is
maintained.
The ue and combustion air ducts supplied with the heater
are capable of withstanding their own weight over the
allowable ue lengths. Wall bands and bracing brackets,
or equivalent, must be used to provide lateral stability and
should be used at centres not exceeding 2.5 metres.
All models are supplied as standard with a rear ue outlet
and the ue outlet and combustion air sockets temporarily
tted.
2.2.1. Fitting Flue/Combustion Air Sockets
1. Apply a bead of silicon sealant around the face of the
ange on the exhaust fan outlet tube that can be seen
from the outside of the heater. Place the ue socket on the
outside of the heater to mate with this ange and clamp
the two anges together, on either side of the heater panel
using the screws provided. Ensure that the silicon sealant
has sealed between the two anges.
- 300mm below an opening e.g. window, air brick
etc.
- 200mm below eaves or gutter.
- 300mm from an internal or external corner.
- 1200mm from a surface facing the terminal.
- 1500mm vertically from another terminal on the same
wall.
- 300mm horizontally from another terminal on the same
wall.
- 2000mm from ground level.
2.2.3. Installation of Flue System
Note: A terminal guard, as supplied by
Powrmatic Ltd, must be tted to horizontal ue
terminals.
Notes for all systems.
i) Final overall length of adjustable disconnection
piece must be between 360 - 415mm.
ii) 45° osets may be used if required. Each set is
equivalent to 0.5m of ue length.
iii) Where NVS heaters are used in clean environments it
is permissible to take the combustion air directly from the
heated space. The supplied mesh intake plate, must be
tted to the combustion air inlet on the rear of the heater.
2. If ducted combustion air is not required (see Section
1.3.7.) t the mesh inlet plate behind the unused
combustion air inlet hole.
3. Apply silicon sealant and ret blanking plates as required
to seal unused panel holes.
2.2.2. General Requirements
See Figures 1a to 2b for the dierent types of ue
installation. In all cases the ue outlet socket must be
connected via the provided ue system to outside air.
The maximum permitted length of ue system is 6m, or
12m if the ue outlet only is used. If an oset is required
two sets of 45° bends should be used each set being
equivalent to 0.5m of ue length. 90° bends may be used
but each set will be equivalent to 1.0m of ue length.
All outer joints must be nished with the provided locking
bands. A smear of silicon grease to the inside of sockets
will assist in tting components together. All ue and
combustion air ducts must be supported independently
of the air heater. The ue or ue/combustion air terminal
must not be installed so as to be less than:
2.2.3.1. Horizontal System - Rear Outlet
Note: If the outlet is required to the side of the
unit 90° bends may be tted directly onto the
inlet/outlet spigots on the heater.
1. Locate the position of the ue terminal,
allowing for a slight gradient running down from the
heater to the terminal of 2° - 3° and cut a hole to suit.
2. Fit the ue terminal, securing via the wall plate and
weather with silicon sealant or similar.
3. Fit the twin to concentric adaptor to the terminal section
and extend the ue and combustion air ducts to the heater
using straight lengths. Fit an adjustable length prior to the
unit, to facilitate ue disconnection for servicing. Extend
the adjustable lengths to make the nal connection to the
appropriate heater inlet/outlet spigots.
4. Ensure that internal silicon sealing rings are in place and
that all tubes are pushed fully home. Secure concentric
lengths with the locking bands provided.
5. A suitable 90° elbow should be tted to the ue
condense drain pipe which in turn is connected to the
condense trap. See 2.2.4
page no. 16 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Page 17
Fig 1a Individual system - horizontal
Type C installation
Fig 1b Individual system - vertical
Type C installation
Flue socket
Lengths
Adjustable
length
Combustion
air socket
Maximum 6m, Minimum 980mm
Note: A terminal guard may be required.
Single to twin
adaptor
Combustion
air duct
Terminal
2.2.3.2. Vertical System - Rear Outlet
1. Locate the position of the ue terminal cut a hole in the
roof to suit.
2. Fit the ashing and the ue terminal so that the lower
edge of the outer case is over the top of the ashing.
Weather with silicon sealant or similar.
Fit a condensate drain length into the ue socket on
the heater and an equivalent straight length onto the
combustion air socket.
3. Fit the twin to concentric adaptor to the terminal section
and then extend down to the heater using straight lengths.
Fit adjustable lengths as the nal connection pieces, to
facilitate ue disconnection for servicing.
Extend the adjustable lengths to make the nal connection
but do not exceed the maximum extended length so as to
maintain joint integrity.
Extend the drainage o take of the condensate drainage
length to a suitable gully or drain.
Single to twin adaptor
Lengths
e
h
Adjustable
lengths
Condensate drain length
Flue socket
Lengths
200mm Length
90° Bend
Combustion air
socket
Terminal
Flashing
*
*
*
*
Adjustable length
200mm Length
Combustion air socket
Terminal
Flashing
6m maximum
Adjustable length
200mm Length
90° Bend
*
*
*
Maximum 6m
Minimum
80Ø - 1480mm
6m maximum
100Ø - 1560mm
130Ø - 1860mm
*
*
*
*
2.2.3.3. Internal Combustion Air System
1. Complete the run of ue sections from the terminal
spigot to the ue outlet socket of the heater generally as
described in 2.2.3.1. and 2.2.3.2., ensuring that the internal
silicon sealing rings are in place.
Fig 2a Exhaust only system - horizontal
Type B installation
OPTION 1
Combustion air entry
(fitted with i nlet g rille)
Flue
outlet
Adjustable
length
Lengths
Terminal
4. Ensure that internal silicon sealing rings are in place and
that all tubes are pushed fully home. Secure concentric
lengths with the locking bands provided.
Note: A terminal guard may be required.
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
OPTION 2
Combustion air entry
(fitted with inlet grille and
inlet bend (not shown))
12m maximum, Minimum 980mm
page no. 17 of 36
Page 18
Fig 2b Exhaust only system - vertical
Type B installation
Terminal
If the condensate outlet from the heater is blocked for any
reason e.g. freezing, and consequently condensate builds
up in the heater a oat switch will operate and shut the
heater down.
The outlet from the trap must be run to a local drain point.
Flashing
Maximum 12m
Lengths
Adjustable
length
Condensate drain
length
Flue
socket
Combustion air entry
(fitted with inlet grille
80Ø - 1480mm
100Ø - 1560mm
130Ø - 1860mm
2.2.4. Condense Length
Note: NVS heaters are NOT tted with an
internal trap and must be tted with an
external trap similar to drawing that is shown
below. The trap can be fabricated using
standard domestic 32mm waste water ttings.
Ensure that the dimensions shown are adhered to.
As NVS heaters will generally be mounted at high level
drainage under gravity will be adequate. Where this is
not possible a proprietary condensate pump should be
used. Install following the instruction provide with the
condensate pump.
Notes:
Trap must be positively connected to both the
heater andthe ue condense outlets.
Two separate traps may be used if required.
Access points and/or unions must be included to allow for
trap cleaning.
The approximate amount of condensate the units will
produce per hour is:
Natural Gas G20
Model l/h l/m
NVS30 2.3 0.038
NVS60 3.4 0.056
NVS90 6.0 0.098
NVS140 8.8 0.147
Propane LPG
Fit the condensate drain trap to the drain pipe at the rear of
the heater (15mm). Connect the condense drain length (or
condense drain Tee) (15mm) to the same trap assembly. See
Fig 3. The traps must be lled with water after installation
and before the heater is commissioned.
page no. 18 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Model l/h l/m
NVS30 1.2 0.020
NVS60 1.7 0.028
NVS90 3.0 0.050
NVS140 4.4 0.073
Where it is necessary to route some, or all, of the drain
pipe external to the building precautions must be taken
to prevent the condensate freezing in low temperature
conditions. The drain pipe must be insulated and, if
necessary, tted with a trace heating cable.
Page 19
2.3 General Identication of Electrical Items
HIGH LIMIT RESET
PRESSURE SWITCH
BURNER RESET
(ON/OFF UNITS ONLY)
* PACTROL BOARD
EXHAUST FANGAS VALVE
** BRAHMA BOARD
(HI/LO & MODULATION ONLY
2.4 Electrical Cable Installation
2.4.1 Electrical Connections
Warning: THIS APPLIANCE MUST BE
EARTHED.
Wiring external to the air heater must be installed in
accordance with the I.E.E. Regulations for Electrical
Installations and any local regulations which apply. Wiring
should be completed in exible conduit.
Heaters are for use with 230V, 1N, 50Hz supplies.
The method of connection to the main electricity supply
must:-
- facilitate the complete electrical isolation of the heater(s)
that will prevent remote activation of the heater during
servicing.
- be in a readily accessible position adjacent to the
heater(s).
- serve only the heater(s).
- have a contact separation of at least 3mm in all poles.
See the wiring diagram for the heater electrical
connections.
All units, (with the exception of units supplied with a
centrifugal fan/silencer duct section) are fully prewired
and only require nal connections for the incoming mains
supply and completion of the control circuit (230V).
Warning: Lockout reset is by a switched
Neutral to the controls in the heater.
The electrical supply must be run to a point adjacent to the
heater and be suitably terminated to provide an isolation
point that will prevent remote activation of the unit during
servicing.
Reference must be made to Section 1.2 to ascertain the
electrical loading of the unit(s) being installed so that
cables of adequate cross-sectional area are used for
the electrical installation. The length of the conductors
between the cord anchorage and the terminals must be
such that the current carrying conductors become taut
before the earth conductor if the cable or cord slips out
of the cord anchorage. All external controls must be of an
approved type.
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
page no. 19 of 36
Page 20
NVS/D models supplied less fan must be electrically
interlocked to the air movement system so that this is
started in the same manner as the air heater fan would be
viz. A connection from heater terminal number 9 must be
2.4.2 Initial Wiring Instalation
Key
A = 2 core and earth
B = Powrtrol = 4 core and earth
Powrtrol RR= 6 core and earth
MC200 On/O = 6 core and earth
MC200 Hi/Lo = 7 core and earth
MC200 Mod = 8 core and earth
C= 4 core and earth
D= Screened 2 core (MC200 models only)*
* (screen must be grounded only at the MC200, See
instructions supplied with controller for wiring sizing,
Max. 100m)
2.4.3 External Wiring
made to one side of the fan motor contactor coil, the other
side of the coil being connected to Neutral. The fan motor
electrical supply must not be taken direct from the internal
wiring of the NVS heater.
The wiring terminals are located inside the electrical box
behind the side door which rstly has to be opened.
The mains supply connections are via a Hylec terminal
block. Control Circuitry connections are via a 30A
numbered terminal strip. They are:
terminal 1 - 230V Heat Demand
terminal 9 - 230V Main Fan Only
terminal 13 - Burner reset - Neutral Switch
terminal 14 - Lockout indication 230V Output
terminal 16* - 0V (modulating negative)
terminal 17* - 0 - 10V (modulating) OR 230V High
Used where required
Fire *
2.4.4 External Fuses
Model
NVS30
NVS60
NVS90
NVS140
F - Free Blowing
Unit
Fuse Rating (A)
2 5
3 16
5 16
7 25
'C' - Centrifugal
Unit
Fuse Rating (A)
t1
t9
t13
t14
E
N
L
Note:
To achieve maximum system eciency it is
recommended that NVx units are controlled
by an MC200 Fuel Saver unit. Simple room
page no. 20 of 36
thermostat and thermostat/time clock control systems will
not provide optimum system eciency and fuel savings.
Wiring drawings and instructions are supplied with the
respective controller.
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Page 21
COMPONENT LIST
A. Ignition Sequence Controller
B. High Limit Thermostat
C. Neon Indicator CO430A A
D. Fan Command Module
E. Air Pressure Switch LGW3 A2
F. Ignition Electrode
G. Rectification Probe
I. Internal Lockout Reset Button
J. Modulating Driver Board
K. Jox Relay
2.5 Wiring Diagrams
NVS 30-140 Axial Fan Crossow Units
NV CONTROL PANEL
NV0162100 / P25 / NVS
B
C
Blu 0.5
r
B
e
l
Y
21 C
Or
W
h
r
B
l
B
u
r
O
D
Br
Gr/Yel
Gr/Yel
Br 1.5
LL
LL
EEEENN
Br
Blu
Blu 1.5
NN
Blu
*
Br
Blu
Red
2233445566
11
Blu
Br
Blu 1.5
7777888899
A
r
B
l
B
u
13 14 15
1
l
B
u
r
B
e
l
Y
W
20
19
I
18
18
C
O
N
C
N
E
Blu 1.5
Blu 1.5
*
Wh
Wh
Br 1.5
Br 1.5
*
99
Yel
BluWhBl
11 11
12 12
10 10
h
8 9 10 11 12
l
u
B
W
h
l
B
k
r
O
l
B
u
e
l
Y
1 2 3 4 5 6 7
*
*
*
Or
13 13
14 14
15 15
16 16
17 17
18 18
JT 1 JT 2
1
1
K
Gr/Yel
J6/CON 6 J7/CON 7
16171819
1
Vi
Blk
C
O
M
N
O
N
C
F G
= Brahma NDM32
= Pactrol P25
1 2 3 4
1
If HEAT ENABLE is
required from the
modulating voltage (e.g. for
BMS control) then link T18
to T1.
e
0
-
1
0
v
r
o
i
H
-
i
F
r
0
v
c
t
o
k
u
L
o
t
e
s
e
R
a
F
n
a
l
n
b
E
e
a
n
l
b
e
e
a
t
H
E
L
A
R
T
U
E
I
L
E
V
H
T
R
A
Wiring Legend
Connections made by Control
board Assembler
Connections made by Final
Assembler
Connections made by
Installer
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142403609
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146522174
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142423003
143070274
142400303
PART NO.
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EXTERNAL CONTROLS
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MAINS SUPPLY
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NV/S 90 onwards
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NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
7
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page no. 21 of 36
Page 22
77
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Additional Wiring for Optional Items
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NV Panel
Terminals
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Interconnecting Wiring:
Powrmatic MC200
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On/O Burner
MC200 fuelsaver
Modulating
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Hi/Lo Burner
GAS VALVE
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page no. 22 of 36
Modulating Burner
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NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
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Page 23
2.6 Commissioning and Testing
2.6.1. Electrical Installation
Checks to ensure electrical safety must be carried out by a
qualied person.
2.6.2. Gas Installation
For new installations, the whole of the gas installation,
including the meter, should be inspected and tested
for soundness and purged in accordance with the
recommendations of IGE/UP/1 (Edition 2) or IGE/UP/2A as
appropriate.
2.6.3. Air Distribution System
The system should be checked to ensure that the
installation work has been carried out in accordance with
the design requirements.
Particular attention should be given to the correct
arrangement of delivery ducts and registers, return air
ducts and grills and general adequacy of return air paths.
1. Switch on the electrical supply at the isolator.
2. If the High limit indicator light comes on press the limit
reset switch on the front panel. The Red indicator light will
go out and the ignition sequence will commence. After
a delay of approximately 45 seconds the ignition spark
will be generated and the main gas valves energized. The
burners will then light.
3. If the burners fail to light the control box will complete a
further four ignition attempts. If at the end of ve attempts
the burners have still not lit the control box will go to
lockout and the red indicator light, internal and remote
lockout lights will be illuminated. To restart the ignition
sequence depress the illuminated reset button for about
1-2 seconds.
4. SHUT OFF Set the external controls to OFF or MIN.
2.6.6 Adjustments
Nominal CO values are given for guidance in the following
table:
For NVS/D units ensure that the duct work is balanced so
that the specied motor running currents are achieved See
section 1.2
2.6.4. Checks before lighting the Air Heater
The following preliminary checks should be made before
lighting the heater(s)
a) Ensure that the ELECTRICAL supply to the heater is
switched OFF.
b) Check that all warm air delivery outlets are open.
c) Check that all external controls are calling for heat.
d) If an MC200 or Powrtrol is being used ensure that the
control is set to winter operation.
2.6.5. Lighting the Air Heater
NOTES: On initial lighting of the heater(s), it may
take some time to purge the internal pipe work
of air.
IMPORTANT: The internal pipe work of the
appliance has been tested for soundness
before leaving the factory. After
establishing the main burners test round
the gas inlet connection using a leak detection uid.
Model 30 60 90 140
Natural Gas G20
High Fire CO %
Low Fire CO %
Propane G31
High Fire CO %
Low Fire CO %
7.5 7. 3 7.9 8.9
3.72 3.1 3.6 3.9
7.3 7.9 8.5 8.1
4.1 3.8 3.7 4.1
2.6.6.1. Burner Gas Pressures
This is set for the required heat input before despatch.
In the case of Hi/Lo and Modulating units both high and
low pressures are set. Pressures should be checked in the
following manner.
2.6.6.1.1. Standard On/O Units
1. Set external controls to ensure that the main burner is
o. Open the side access door. Connect a pressure gauge
to the burner pressure test point on the multifunctional
control.
2. Set external controls so as to turn on the main burner.
Compare the measured burner gas pressure to that
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
page no. 23 of 36
Page 24
stated on the data plate. If necessary adjust the burner
gas pressure by turning the regulator screw anticlockwise
to decrease the pressure, or clockwise to increase the
pressure.
3. In addition it is advisable to check the gas rate using the
gas meter dial pointer. Ensure that no other appliances
supplied through the meter are in operation.
4. If required, after checking or setting the burner
pressures, the CO content in the ue gases can be
checked by sampling in the rst section of ue tted to the
ue outlet of the unit. Nominal CO values are given for
guidance in the Table at the bottom of the previous page.
2.6.6.1.2. High/Lo Regulator
Cover
Lever point
Hexagonal
adjustment screw for
maximum pressure
setting
Internal slotted
adjustment screw for
minimum pressure
setting
5. Turn o the main burner and disconnect the pressure
gauge and replace the sealing screw. Turn on the main
burner as above and test for gas soundness around
pressure test joint using a leak detection uid e.g. soap
solution.
Governor adjustment screw under cover cap
(Honeywell VR4605AB1027)
Fitted to the NVS 30, 60, 90
Governor adjustment screw under cover cap (Honeywell
VK425AB1007)
1. Set external controls to ensure the main burner is o.
Open the side access panel. Connect a pressure gauge to
the burner pressure test point on the multifunctional
control.
2. Set external controls to turn on the main burner and
maintain high re. Compare the measured burner gas
pressure to that stated on the data plate. In addition it
is advisable to check the gas rate using the gas meter
dial pointer ensuring that no other appliances supplied
through the meter are in operation.
3. Repeat 2 above with external controls set to maintain
low re.
4. If it is necessary to adjust either the high re or low re
pressures proceed as follows after levering o the plastic
cover from the Hi/Lo regulator.
Note: High re setting must be adjusted rst
after which the low re setting can be set. Any
adjustment of the high re setting alters the
minimum setting.
Maximum Setting
With the controls set to high re use an adjustable or 8mm
spanner to turn the adjustment screw for high re pressure,
clockwise to increase and counter-clockwise to decrease,
until the required pressure is obtained. Turn the burner On
and OFF several times to check the pressure setting and
then turn o.
Fitted to the NVS 140
page no. 24 of 36
Minimum Setting
Disconnect electrical connection of high/low regulator and
turn burners back on and wait until the burner pressure has
stabilized. Use a screwdriver to turn the slotted adjustment
screw for low re pressure, clockwise to increase and
counter-clockwise to decrease, until the required pressure
is obtained. Reconnect high/low regulator and check high
re pressure. Repeat both steps if necessary and then
replace cover cap.
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Page 25
5. Turn o the main burner, disconnect the pressure gauge
and replace the sealing screw. Turn on the main burner and
test for gas soundness around pressure test joint using a
leak detection uid. Replace access panel.
2.6.6.1.3. Modulating Regulator
Shaft
Cap
Adjustment nut (7mm)
for maximum pressure setting
Adjustment nut (9mm)
for minimum pressure setting
‘O’ ring
6.3mm AMP terminals
to decrease until the required pressure is obtained.
Reconnect modulating regulator and check high re
pressure, readjust if necessary.
Maximum Setting
Disconnect electrical connection of modulating regulator
and turn burners back on and wait until the burner
pressure has stabilized. Push shaft gently downwards to
the maximum adjustment screw and hold there. Turn 7mm
adjustment nut for high re pressure, clockwise to increase
and counter-clockwise to decrease, until the required
pressure is obtained. Release shaft. Repeat both settings if
necessary and then replace cover cap.
5. Turn o the main burner, disconnect the pressure gauge
and replace the sealing screw. Turn on the main burner and
test for gas soundness around pressure test joint using a
leak detection uid. Replace access panel.
2.6.6.1.4. Modulating Interface Board
1. Set external controls to ensure that the main burner is
o. Open the side access panel. Connect a pressure gauge
to the burner pressure test point on the multifunctional
control.
2. Set external controls so as to turn on the main burner
and maintain high re. Compare the measured burner
gas pressure to that stated on the data plate. In addition
it is advisable to check the gas rate using the gas meter
dial pointer ensuring that no other appliances supplied
through the meter are in operation.
3. Repeat 2 above with external controls set to maintain
low re.
4. If it is necessary to adjust either the high re or low re
pressures proceed as follows after removing the plastic
cover from the Modulating regulator.
Note: Minimum re setting must be adjusted
rst after which the high re setting can be set.
Any adjustment of the minimum re setting
alters the maximum setting.
Modulatiing Regulator
Minimum Setting
Disconnect electrical connection of modulating regulator
and turn burners back on and wait until the burner
pressure has stabilized. Turn 9mm adjustment nut for low
re pressure clockwise to increase and counter-clockwise
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Modulating Interface Board
page no. 25 of 36
Page 26
The MIB interfaces between a 0-10VDC control signal and
the modulating regulator. The following are applicable to
this application.
1. The setting of the slide switches 1 & 2 should both be to
OFF.
2. Potentiometer P1 (Default setting 100%)
The control current of the V7335A is controlled by P1,
varying between 50% and 100% of the input signal.
E.g.
-When P1 is set at 100% (fully clockwise) maximum power
(165mA @ 22VDC) is provided to the modulation coil with a
10VDC input control signal.
-When P1 is set at 50% (fully anticlockwise) maximum
power (165mA @ 22VDC) is provided to the modulation coil
with a 5VDC input control signal.
3. Potentiometer P2
Controls the minimum drop-out voltage between 0% and
40% E.g.
- When P2 is set at 0% the drop-out voltage with an input
control signal of 0-10V-DC is 0.3V-DC.
- When P2 is set at 40% the drop-out voltage with an input
control signal of 0-10V-DC is 4.0V-DC.
4. Potentiometer P3 (Default setting 100%)
Controls the maximum hold-in voltage. Its proportional
value is added to the P2 setting E.g.
- When P2 is set at 0% and P3 is set at 5%, the hold-in
voltage of the burner relay is adjustable between 5% and
100% of the input control signal. If the input control signal
is set at 0-10V-DC the hold-in voltage of the relay is 0.5VDC.
- When P2 is set at 40% and P3 is set at 5%, the hold-in
voltage of the burner relay is adjustable between 45% and
100% of the input control signal. If the input control signal
is set at 0-10V-DC the hold-in voltage of the relay is 4.5VDC.
The following table shows the relationship between P2 and
P3 settings.
5 10 20 30 40 50 60 70 80 90 100
P2%
0
10
20
30
40
Drop Out
Volts
0.3 0.5 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
1.0 1.5 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
2.0 2.5 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
3.0 3.5 4.0 5.0 6.0 7.0 8.0 9.0 10.0
4.0 4.5 5.0 6.0 7. 0 8.0 9.0 10.0
2.6.6.2. Flame Current
1. To measure the ame current connect a multimeter
capable of measuring micro amps as shown in the
following diagram.
P3%
Hold-in Voltage
2. Minimum current reading is 0.5µA and normal value
should be 1.5µA or higher.
2.6.6.3. Air Heater Controls
1. Close the gas service tap and ensure that the gas valve
is heard to close within 1 second and that the lockout light
is illuminated. Note that the heater may attempt ve reignitions before going to lockout. Open the gas service tap
and reset the unit from lockout.
Flame Current Measurement
page no. 26 of 36
2. Check that the room thermostat and all automatic
controls are operating satisfactorily.
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Page 27
2.6.7. Limit Thermostat
Thermostat settings:-
Limit
NVS 15-140SF 90°C
the air heater and associated controls. Adjust the automatic
controls to those values required by the User.
Finally, advise the user or purchaser that, for continued
ecient and safe operation of the air heater, it is important
that servicing is carried out annually.
2.6.8. Handing over the Air Heater
Hand these instructions to the user or purchaser for
retention and instruct in the ecient and safe operation of
2.7 Servicing
WARNING: Always switch o and disconnect
electricity supply and close the gas service
valve before carrying out any servicing
work or replacement of failed components.
NOTE: If a suspended air heater is to be serviced
do not lean ladders against the heater.
Ensure that an access tower or equivalent is
used.
NOTE: The access door to the controls section
may be removed to improve access.
Open the door to 90°, remove the earth cable
at the bottom, and then lift the door vertically
upwards to disengage the hinge plates.
Ret in reverse order. Ensure that the earth cable is
retted.
In the event that the premises are not yet occupied turn
o the gas and electricity supplies and leave instructional
literature adjacent to gas meter.
from the top of the gas control valve assembly.
3. If required remove the manifold by removing the four
screws securing it to the burner assembly.
4. Remove the two screws that secure the top of the burner
assembly to the bulkhead and lift out burner assembly.
5. Using a sti brush, not a wire brush, brush the burners
to dislodge accumulated deposits. Inspect the burners
both internally and externally to ensure that they are clean.
Examine the injectors and if damaged or deteriorated,
replace with new ones of the correct size and marking. If
deemed necessary, clean the injectors. Do not broach out
with wire.
6. Reassemble the injectors, manifold and burners in
reverse order to that above.
2.7.1. General
2.7.3. Ignition and Rectication Electrodes
Full maintenance should be undertaken not less than once
per year by a qualied person. After any servicing work
has been complete, or any component replaced, the air
heater(s) must be fully commissioned.
2.7.2. Main Burner Assembly Removal
1. Ensure that the gas service valve is turned OFF and then
unscrew the union nut situated immediately downstream
of it.
2. Disconnect the spark and rectication leads from the
control box and remove the electrical plug connections
from the top of the gas control valve assembly.
2. Disconnect the spark and rectication leads from the
electrodes and remove the electrical plug connections
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Inspect the electrodes, making sure that they are in a
sound and clean condition. In particular check that the
ignition electrode is clean and undamaged. Check that the
spark gap is 2.5mm and that the rectication probe is 10 12mm forward of the burner.
Ignition Electrode Spark Gap
Note: The ignition electrode is located at the
bottom of the burner assembly, the rectication
electrode is located at the top of the burner
assembly.
2.5mm
page no. 27 of 36
Page 28
2.7.4. Heat Exchanger
2.7.6. Condense Drain & Trap
Whilst the main burner assembly is removed from the unit,
check that the primary sections that the burners re into
are clean.
2.7.5 Main Fan Assembly
2.7.5.1. NVS/F Models
1. Inspect the fan blades for any damage or excessive
buildup of deposits that could give rise to an imbalance.
Remove the assembly for cleaning as follows.
2. Slacken the cable gland on the heater casing through
which the fan electrical cable passes.
3. Disconnect the fan leads from the electrical terminals.
4. Withdraw cable through entry grommet.
5. Remove the fan and motor assembly complete by
removing the hexagon headed screws that secure the fan
to the rear panel.
Ensure that the condense trap is clean and that the
drainage pipe work is not blocked or damaged.
2.7.7. Replacement of Faulty Components
2.7.7.1 Multifunctional Control
1. If there is movement available on the incoming gas pipe
work e.g. a exible connection has been used go to step
2 otherwise remove the burner assembly as previously
described in Section 2.7.2.
2. Remove the electrical plug connections from the top of
the multifunctional control.
3. Release the anged connections at the inlet and
outlet of the multifunctional control and remove the
multifunctional control.
4. Reconnect the new valve in the reverse order to that
above ensuring that the valve is correctly orientated.
Renew the sealing 'O' rings if necessary.
6. Reassemble in reverse order.
2.7.5.2. Centrifugal Fan/Silencer Section
1. Remove section side panel(s) and inspect the fan blades
for any damage or excessive buildup of deposits that
could give rise to an imbalance. Remove the assembly for
cleaning as follows.
2. Slacken the cable gland on the casing through which the
fan electrical cable passes.
3. Disconnect the fan leads from the electrical terminals in
the contactor enclosure.
4. Withdraw cable through entry grommet.
5. Remove the complete fan assembly by removing the
xings securing the fan to the base rails.
6. Reassemble in reverse order.
2.7.7.2. Burners
1. Remove the burner assembly as described in Section
2.7.2.
2. Remove the end plates of the burner assembly and the
central burner support plate.
3. Exchange burners as required and reassemble
components in reverse order.
4. Re-commission the appliance as described in Section 2.6.
2.7.6.3. Electrode Assemblies
1. Disconnect the electrode leads from the control box as
appropriate.
2. Remove the screw securing the electrode assembly to
the burner assembly side plate and withdraw the assembly.
page no. 28 of 36
3. Fit replacement and reassemble in reverse order. Check
that the spark gap is 2.5mm (See section 2.6.3) and the
rectication electrode is 10 - 12mm forward of the burner.
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Page 29
2.7.7.4. Limit Thermostat
2.7.7.7. Control Box
Limit NVS 15-140SF 90°C
1. Remove the screws securing the thermostat phial
mounting plate to the inner bulkhead, withdraw assembly
and unclip the phial.
2. Remove the electrical connections from the limit
thermostat. Remove the securing nut and remove
thermostat from the front panel.
3. Fit replacement thermostat in reverse order.
2.7.7.5. Exhaust Fan
1. Remove the four screws securing the ue outlet socket.
2. Disconnect the fan electrical connections from the main
terminal strip
3. Remove the screws securing the fan mounting box to
the exhaust header plate.
4. Remove fan assembly by pulling forwards and to the left
to disengage the retaining lugs.
5. If needed, transfer the fan mounting box to the
replacement fan.
1. Unplug all the electrical connections.
2. Remove the screws that secure the control box in place.
3. Fit replacement in reverse order.
2.7.7.8. Fan Command Module
1. Trace the wires from the module and disconnect.
2. Remove the two securing screws.
3. Fit replacement in reverse order.
2.7.7.9. Centrifugal Fan/Motor
1. Disconnect the electrical connections to the centrifugal
fan section.
2. Remove the side panels of the section for access to the
fan and motor.
3. Fit replacements as appropriate and reassemble in
reverse order.
6. Fit replacement exhaust fan, using new gaskets and
silicon sealant as necessary, and reassemble in reverse
order.
2.7.7.6. Air Pressure Switch
1. Remove the two screws securing the cover and remove
cover.
2. Disconnect electrical connections.
3. Pull o the sensing tube from the air pressure switch.
4. Note the setting of the old pressure switch.
5. Remove the screws xing the air pressure switch and
remove switch.
6. Fit replacement in reverse order retting the sensing
tube to the negative (- or L) tapping on the pressure switch.
Adjust setting to that of the old pressure switch.
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
page no. 29 of 36
Page 30
3.1 List of Parts
Item Description Usage Part No.
Gas Valve V4105A 30 145035208/KIT
Gas Valve VR4605AB 60 - 90 145035204/KIT
Gas Valve V425AB 140 141378715/KIT
Ignition Electrode
30/60
90/140
Rectication (Flame Sensor) Probe All 142423003
30/60
Burner
90/140
Limit Stat All 142403609
Fan Command Module All 142403605
142423002
142400004
142400240
142400241
Control Box (Sequence Controller) All 145030847
Pressure Switch Dungs LGW All 14 6522174
Float switch All 144807869
page no. 30 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Page 31
JOX Relay All 143000816
Hi/Lo Governor Head 30-140 -/HL 142466402
Modulation Governor Head 30-140 -/MOD 142466403
Modulation Driver (GM44) 30-140 -/MOD 142400303
Exhaust Fan
Exhaust Fan c/w Mounting Brackets
Exhaust Fan
Exhaust Fan c/w Mounting Brackets
Exhaust Fan
Exhaust Fan c/w Mounting Brackets
Main Air Fan - NVS F
Main Centrifugal Blower NVS C
30
30
60
60
90/140
30/90
60/140
30
60
90
140
140210496
NV1050EXH
140201505
NVS6075EXH
140201506
NVS90140EXH
140232006/E /15
140232007/E/15
1402CFAN150/T/15
1402CFAN580/ T/15
tba
tba
Contactor
120SF-140SF, All -/C
60-90SF, All -/C
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
143000600
143000601
page no. 31 of 36
Page 32
3.2 Gas Conversion
Gas Safety (Installation & Use) (Amendment)
Regulations
It is law that all gas appliances are
installed, adjusted and, if necessary,
converted by qualied persons* in
accordance with the current issue of the
above regulations. Failure to install appliances
correctly can lead to prosecution. It is in your own
interests and that of safety to ensure that the law is
complied with.
* An approved class of person listed on the gas safe
register.
3.2.1. General
Heater conversion between gases will require a change of
burner injectors, alteration of burner pressure and
re-commissioning of the heater. (Refer to section 2.6 for
commissioning details.)
Ensure that the gas inlet pressure to the heater
is correct for the new gas, and that the gas
supply has been purged of the old gas. (Refer
to tables opposite for new gas inlet pressures.)
3.2.2. Burner Conversion
3.2.3.1. Sigma 843 Adjustment
Cap
Adjustment nut (10mm)
for maximum pressure
setting
Adjustment screw
for minimum
pressure setting
3.2.3.2. Honeywell High/Low Adjustment
Hexagonal
adjustment screw for
maximum pressure
setting
Cover
Lever point
Internal slotted
adjustment screw for
minimum pressure
setting
1. Ensure that the gas service valve is turned OFF.
2. Remove the burner heat shield, 3 screws.
3. Release the outlet connection ange from the gas valve
by removing the four screws.
4. Remove the manifold by removing the four screws
securing it to the burner assembly.
5. Remove the main burner injectors and washers.
6. Replace with the new injectors/washers for the new gas
ensuring a gas tight seal.
7. Ret all other components in reverse order.
3.2.3. Gas Valves
All gas valves used on the NVS range have pressure
regulators that may be set to operate on natural gas or
propane (LPG).
Conversion is carried out by adjusting the high and low
burner pressures to the value in the tables opposite.
(Refer to full regulator adjustment in section 2.6.6.1)
3.2.3.3. Honeywell Modulating Adjustment
Shaft
Cap
Adjustment nut (7mm)
for maximum pressure setting
Adjustment nut (9mm)
for minimum pressure setting
‘O’ ring
6.3mm AMP terminals
Note*: Ensure the original data badge is
removed and replaced with new data badge
and "change of gas" stickers.
page no. 32 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Page 33
Natural Gas to Propane (LPG) Conversion Data
Nominal Inlet Pressure = 37mbar, Minimum Inlet Pressure = 37mbar
Injectors
MODEL
Conversion Kit
part number
No. Size (mm)
Marked
Injector part
number
High Fire Low Fire
Burner
Pressure
mbar mbar
NVS30 NV30LPG 6 1.25 125 142401673 26.5 7.6
NVS60 NV60LPG 8 1. 55 155 142401675 20.0 7. 4
NVS90 NV90LPG 6 2.10 210 142401676 24.0 8.4
NVS140 NV140LPG 10 2.10 210 142401676 22.6 6.9
Propane (LPG) to Natural Gas Conversion Data
Nominal Inlet Pressure = 20mbar, Minimum Inlet Pressure = 17.5mbar
Injectors
MODEL
Conversion Kit
part number
No. Size (mm)
Marked
NVS30 NV30NG 6 1.94 194 14240166 4 10.0 3.3
Injector part
number
High Fire Low Fire
Burner
Pressure
mbar mbar
Burner
Pressure
Burner
Pressure
NVS60 NV60NG 8 2.54 254 142401665 8.3 2.6
NVS90 NV90NG 6 3.5 350 142401666 8.2 2.8
NVS140 NV140NG 10 3.5 350 142401666 7. .9 2.3
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
page no. 33 of 36
Page 34
Appendices
Information required for ecodesign (ErP) Directive 2009/125
Model NVS30 NVS60 NVS90 NVS140
High Heat Input kW 29.0 59.2 86.7 138.0
Rated Heat Capacity kW 30.0 60.0 90.0 140.0
Low Heat Input Nett CV kW 15.8 32.7 51.0 77.3
Minimum Heat Capacity kW 15.2 32.7 51.0 77.3
Useful Efficiency
Electrical Power Consumption*
NOx Seasonal (Gross) mg/kWh 143.7 153.6 149.8 148.3
Envelope Loss Factor % n/a n/a n/a n/a
Emission Effiency
Seasonal Space Heating
Energy Efficiency
High Fire % 103% 101% 104% 101%
Low Fire % 96% 100% 100% 100%
High Fire kW 0.07 0.07 0.07 0.07
Low Fire kW 0.07 0.07 0.07 0.07
Standby kW <0.01 <0.01 <0.01 <0.01
Ignition kW 0.00 0.00 0.00 0.00
On/Off
Hi/Lo & Mod 94% 94% 93% 94%
On/Off
Hi/Lo 79% 81% 83% 81%
Mod 80% 82% 84% 82%
% hs, flow
% hs,h
90% 90% 90% 90%
78% 76% 79% 77%
page no. 34 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
Page 35
Notes
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
page no. 35 of 36
Page 36
More information is available from our web site on:-
http://www.powrmatic.co.uk/products/heating/browse/view/product/nvs-condensing-unit-heater/
HEATING DIVISION
Hort Bridge
Ilminster, Somerset TA19 9PS
Tel: 01460 53535
Fax: 01460 52341
Every effort is made to ensure accuracy at time of going to press. However as part of continued product improvement,
we reserve the right to alter specication without prior notice.
page no. 36 of 36
NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
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