Powrmatic NV Series, NV10, NV15, NV20, NV25 User's Installation And Servicing Manual

The NV Range

CE

Users, Installation and Servicing

Instructions

Pactrol Control

WARNING: THIS APPLIANCE MUST BE EARTHED

£4.00 When supplied separately.

NV Range Users, Installation & Servicing Instructions Issue 3.8 October 2009

Certificate of Guarantee

Dear Customer

This is to certify that this appliance is guaranteed for two years including parts and
labour from the date of original commissioning.

The heat exchanger, where fitted, is guaranteed (parts only) for a further eight years,
chargeable on a sliding scale basis, price relative to age.

To make a claim

In the first instance you must contact your appliance supplier, or installer and
provide:-

1. The appliance type and serial number.

2. The original commissioning documentation.

3. As much detail as possible on the fault.
Your supplier, or installer will then contact Powrmatic to make a guarantee claim
on your behalf.

Conditions of Guarantee

1. The appliance must have been installed by a competent recognised installer,
and in accordance with the manufacturers instructions, building regulations and
local regulations.

2. The appliance has been professionally commissioned.

3. The appliance has been maintained on a yearly basis by a competent servicing

company.

4. The appliance has been used in accordance with the manufacturers instructions.

5. The correct specification fuel has been used

6. No unauthorised repairs or modifications have been made.

7. Powrmatic General Conditions of Sale have been observed.

8. 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 profits or increased costs
arising from loss of use of the appliance, or any event arising there from.

Exclusions

1. Gaskets and fan belts are not included in the guarantee

Powrmatic Ltd, Hort Bridge, Ilminster, Somerset, TA19 9PS

tel: [phone] fax: [phone]

web: www.powrmatic.co.uk

Important: This certificate must

be kept with the appliance

Users Instructions

1. 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.
f) Ensure that the Summer/Winter switch is in the Winter

position.

g) Check that the overheat reset button has not operated.

2. Lighting the Air Heater

NOTE:

On initial lighting of the heater(s), it may take some time to
purge the internal pipework of air. If it is not possible to light
the heater after several attempts contact the local service
company.

1. Switch on the electrical supply at the isolator and the start

up sequence will commence. The internal exhaust fan will run.
When sufficient combustion airflow is proved by the air pressure
switch the ignition spark will be generated and the main gas
valves energized. The burners will then light.

2. If the burners fail to light the control box will go to lockout

and the lockout light on the low level remote reset will be
illuminated. To restart the ignition sequence depress the reset
button on the low level reset for about 5 seconds.
If the unit will not light after four or five attempts then shut
down the unit and call in a service engineer.

3. To Shut Down the Air Heater

3.1 For Short Periods: Turn the room thermostat to the OFF

or lowest setting.

3.2 For Long Periods: Complete step 3.1 above. Wait for 5

minutes and then turn OFF the
electrical supply at the isolator.

external controls to provide air movement.

Winter: The heater will operate normally.

5. Maintenance

Regular servicing is essential to maintain efficient, reliable and
safe operation of the heater. Users are strongly recommended
to have the heater serviced by a qualified person at least annually
and preferably at the end of the heating season.

6. 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

- DO NOT USE A NAKED FLAME - and contact the local gas
undertaking immediately.

All Powrmatic heaters use gas and electricity to power them,
they may also contain moving parts such as pulley belts. It
would be hazardous to tamper with or attempt to service unless
you are a competent person in the field 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 office 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 qualified 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 register.

*

4. Description of Operation

Important: All heaters must be controlled by the fitted external
controls and not by use of the main switch in the electrical
supply to the heater.

4.1 Standard Units

The ignition sequence will commence each time that the external
controls e.g. Timeclock, room thermostat etc. call for heat. The
heater fan will automatically start between 0 - 30seconds
(depending on the setting of the internal timer) after the main
burners light. When the external controls are satisfied the main
burners will be turned off and approximately 2 - 3 minutes later
the heater fan will be automatically stopped.

4.2 High / Lo & Modulating Units

When the main burners are alight the heat output will be
controlled either to high fire or low fire or, in the case of
modulating units, to any point between high and low fire;
depending on the requirements of the space being heated and
the external controls fitted.

4.3 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

Installation & Servicing Instructions

CONTENTS

Section Title Page

1. Introduction 1

2. Technical Data 2

3. General Requirements 5

4. Installation 6

5. Air Distribution System 9

6. Commissioning & Testing 9

7. Servicing 11

8. Connections to External Controls 13

9. Fault Finding Flow Chart 15

10. Short List of Parts 16

Tables Title Page

1. Dimensions 3

2. Specifications 3

3.1 Injector Sizes & Burner Pressures
Natural Gas - Group H - G20 4

3.2 Injector Sizes & Burner Pressures
Propane - G31 4

4. Electrical Loadings 1ph 4

Figure Title Page

1a. Exhaust only system - horizontal 7
1b. Exhaust only system - vertical 7
2a. Individual system - horizontal 8
2b. Individual system - vertical 8

3. Controls Layout 9

4. Governor adjustment (Honeywell VR425A) 10

5. Governor adjustment (Honeywell VR4605A) 10

6. High/Lo Regulator 10

6. Modulating Regulator 11

8. Ignition Electrode Spark Gap 11

1. INTRODUCTION

The NV range are highly efficient gas fired, fanned circulation
air heaters that cover heat outputs of 10kW to 140kW, have a
closed combustion circuit and are supplied complete with a flue
system. They are certified 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. 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 classified as hazardous as defined in
BS 5345: Part 2 or areas subjected to significant negative
pressures due to extract systems.

NV/F heaters have an axial fan assembly fitted at the rear to
circulate the air being heated through the folded tube heat
exchanger. NV/C units are supplied with a centrifugal fan/silencer
duct section and NV/D units for use with ducted systems where
the air moving fan is by others or a centrifugal fan section is
used remote from the heater. NV/DH units are for use in air
handling units and NV/EA units are for siting externally.
Heaters are fitted as standard with atmospheric inshot burners,
a fully automatic control for ignition, flame sensing, gas supply
control and safety functions, an internal exhaust fan, main air
fan (/F and /C models), fan timer,
and limit thermostat.

high temperature thermostat

Options include HIGH/LOW or modulating burner controls,
inlet duct connection, outlet duct connection, 45° head, 90°
outlet bend, vertical/horizontal outlet louvre assembly and a
full range of modular duct components.

Gas Safety (Installation & Use) Regulations

It is law that all gas appliances are installed, adjusted and, if
necessary, converted by qualified 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 register.

1

2. TECHNICAL DATA

K

10mm Suspension Points

Alternative
flue positions

B

A

Front

700

Side

J

120

H

F

455

L

D

C

G

F

E

Top

NV20/D WITH CENTRIFUGAL FAN/SILENCER SECTION SHOWN

Alternative

B

A

700

H

F

120

455

flue positions

G

F

120

M

Front

Side

65

D

C

Top

E

NV60/D SHOWN

Alternative

B

A

Front

700

Side

J

Alternative
flue positions

G

flue positions

H

F

455

NV140/F SHOWN

F

D

C

C

E

Top

2

Table 1. Dimensions

Model

NV10

ABCDEFGHJ M

750 296 192

NV15

590

NV20

NV25

1000

506

176

NV30

NV35

818

NV40

NV50

NV60

NV75

NV90

NV120

NV140

970

818

970

705

870

1035

1345

2345

740

258

870

Table 2 - Specifications

181

172.5

202

120 262.5

142

236.5

248.5

220

244.5

109

118

123.5

750

K

436

631

944

1948

L

524

752

904

752

904

639

804

969

502

697

1010

2014

NOPQ

189

510

151

116

227

738

83

890

151

738

146

890

624

153

88

401

789

954

Flue

Ø (mm)

80

100

130

MODEL

NV10

NV15

NV20

NV25

NV30

NV35

NV40

NV50

NV60

NV75

NV90

NV120

NV140

HIGH FIRE LOW FIRE

INPUT

(Nett)

F

10.79 10.0 6.57 5.90 0.2601

D

F

16.00 15.0 8.22 7.50 0.3902

D

F

21.85 20.0 11.58 9.92 0.5203

D

F

27.32 25.0 16.50 14.30 0.6503

D

F

32.60 30.0 18.34 16.30 0.7804

D

F

39.32 35.0 23.1 19.0 1.000

D
F

43.48 40.0 24.19 21.22 1.0405

D

F

54.23 50.0 28.40 24.83 1.3006

D

F

65.22 60.0 35.63 31.49 1.5608

D

F

81.25 75.0

D

F

95.25 90.0

D

F

126.32 120.0

D

F

148.93 140.0 98.92 92.55 3.6418

D

OUTPUT

kW kW m³/s Pa kW

INPUT

(Nett)

OUTPUT

42.61 37.50

58.50 54.50

75.45 71.00

AIR

VOLUME

1.9510

2.3412

3.1215

MAXIMUM

DUCT

RESISTANCE

N/A 0.040 53

140

N/A
145 0.370 106.5
N/A 0.070 68

177 0.370 120.5

N/A 0.180 89

143 0.370 126.5

N/A 0.180 89

250 1.100 166.5
N/A 0.300 89

210 1.100 166.5
N/A 0.300 93

236 1.100 168.5

N/A 0.440 114
205 1.100

N/A 0.550 130
250 1.50

N/A 0.550 150
260 1.50 234

N/A 2 x 0.440 188

200 2 x 1.10 343

N/A 2 x 0.550 260

284 2 x 1.50 363.5
N/A 2 x 0.550 260

285 2 x 1.50 424

FAN

MOTOR

0.250

0.120

NOISE

LEVEL

dB(A) @ 3m

46

N/A

54

N/A

52

N/A

53

N/A

54

N/A

58

N/A

58

N/A

61

N/A

62

N/A

62

N/A

66

N/A

67

N/A

67

N/A

WEIGHT

kg

91.5

54

183

213

Note: /D data refers to Powrmatic supplied centrifugal/silencer duct section

3