Grant Vortex Pro Internal Combi Series, Combi 26, Combi 21, Combi XS, Combi XS 26 Installation And Servicing Instructions
...
Grant Vortex Pro Internal Combi
Combi XS, Combi 21, Combi 26 and Combi 36
Condensing Oil Boiler Range
Installation and Servicing Instructions
UK | DOC 0122 | Rev 1.1 | May 2018
IMPORTANT NOTE FOR INSTALLERS
These instructions are intended to guide installers on the
installation, commissioning and servicing of the Grant Vortex oil
boiler. After installing the boiler, leave these instructions with the
user.
A user handbook is available to guide users in the operation of the
oil boiler.
SPECIAL TEXT FORMATS
The following special text formats are used in these instructions
for the purposes listed below:
! WARNING !
Warning of possible human injury as a consequence of not
following the instructions in the warning.
! CAUTION !
Caution concerning likely damage to equipment or tools
as a consequence of not following the instructions in the
caution.
! NOTE !
Used for emphasis or information not directly concerned
with the surrounding text but of importance to the reader.
PRODUCT CODES AND SERIAL
NUMBERS COVERED
The serial numbers used on Grant oil boilers consist of a fteen
digit numerical code with the nal three digits being the product
identier.
For example:
100000200218740
These instructions cover the following product codes and serial
numbers:
Product code Serial number identier
VTXCOMBI21 740
VTXCOMBI26 741
VTXCOMBI36 742
VTXXSCOMBI26 781
SERVICING
The boiler should be serviced at least every twelve months and
the details entered in the Service Log in the user handbook.
FUEL TYPE
All Grant Vortex boilers are suitable for use with Class C2
Kerosene.
To use Bio-Kerosene (B30K), refer to the information below:
OPERATION ON BIO-FUEL
All Grant Vortex condensing boilers manufactured since May
2011 are suitable for for operation on both standard Kerosene
(Class C2 to BS 2869) and also bio-kerosene - up to a 30% blend
(B30K).
All burner settings and nozzle sizes (as detailed in Section 2.2 of
these instructions) are correct for both standard kerosene and biokerosene (B30K).
In order to operate this boiler on bio-kerosene, it will be necessary
to take the following actions:
• Use a bio-kerosene (B30K) compatible exible oil line in
place of the oil line supplied with the boiler.
• Have the oil storage tank and oil supply line (including all
pipework, sight gauges, lters, isolating valves, re valves,
de-aeration devices, etc.) checked for their compatibility with
bio-kerosene (B30K).
Where necessary, some or all of these items may have to be
replaced with a bio-kerosene compatible alternative.
• Check the suitability of the ue system with Grant UK.
• Use only bio-kerosne (B30K) that conforms to OPS24.
IMPORTANT:
Under no circumstances, should the boiler be used with
bio-kerosene without the above actions being taken rst.
GRANT ENGINEERING (UK) LIMITED
Hopton House, Hopton Industrial Estate, Devizes, Wiltshire, SN10 2EU
Tel: +44 (0)1380 736920 Fax: +44 (0)1380 736991
Email: info@grantuk.com www.grantuk.com
This manual is accurate at the date of printing but will be superseded and should be disregarded if specifications and/or appearances are changed in the interests of continued product improvement.
However, no responsibility of any kind for any injury, death, loss, damage or delay however caused resulting from the use of this manual can be accepted by Grant Engineering (UK) Limited, the
author or others involved in its publication.
All good sold are subject to our official Conditions of Sale, a copy of which may be obtained on application.
© Grant Engineering (UK) Limited. No part of this manual may be reproduced by any means without prior written consent.
Page 2
CONTENTS
1 INTRODUCTION 4
1.1 How a condensing boiler operates 4
1.2 Boiler description 4
1.3 Flue options 4
1.4 Boiler components 5
2 TECHNICAL DATA 6
2.1 Boiler technical data 6
2.2 Burner settings 7
2.3 Flue gas analysis 7
2.4 Boiler dimensions 8
3 OIL STORAGE AND SUPPLY SYSTEM 10
3.1 Fuel supply 10
3.2 Burner oil connection 12
4 INSTALLATION 14
4.1 Introduction 14
4.2 Boiler location 14
4.3 Regulations compliance 14
4.4 Heating system design 14
considerations
4.5 Pipework materials 14
4.6 Connections 15
4.7 Preparation for installation 15
4.8 Installing the boiler 15
4.9 Expansion vessel 15
4.10 Filling the heating system 15
4.11 Before you commission 15
4.12 Completion 15
5 PIPE CONNECTIONS 16
5.1 Water connections 16
5.2 Making the water connections 17
5.3 Domestic hot water system 17
5.4 To use the water hardness kit 17
6 CONDENSATE DISPOSAL 18
6.1 General requirements 18
6.2 Connections 18
6.3 Pipework 18
6.4 External pipework 18
6.5 Condensate soakaway 19
6.6 Condensate trap 19
6.7 Condensate disposal pipework 19
6.8 Inspection and cleaning of trap 19
6.9 External condensate trap 20
7 SEALED SYSTEMS 21
7.1 Sealed system requirements 21
7.2 Filling the sealed system 22
7.3 Pressure relief (safety) valve 22
operation
8 ELECTRICAL 23
8.1 Connecting the power supply 23
8.2 Connecting the controls - 25
heating only
8.3 Connecting an external frost 25
frost thermostat
9 FLUE SYSTEM AND AIR SUPPLY 27
9.1 Air supply 27
9.2 Conventional ue systems 27
9.3 Connecting a conventional ue 30
9.4 Balanced ue systems 30
9.5 Flue clearances 34
9.6 Prepare the wall 35
10 COMMISSIONING 36
10.1 Before switching on 37
10.2 Burner settings 37
10.3 Air adjuster disc - combi 21 only 39
10.4 Switching on 39
10.5 Running the boiler 40
10.6 Balancing the system 40
10.7 Completion 40
10.8 Information for the user 40
11 SERVICING 41
11.1 Checks before servicing 41
11.2 Dismantling prior to servicing 41
11.3 Cleaning the boiler 41
11.4 Cleaning the burner 43
11.5 Adjuster the diffuser 44
11.6 Air adjuster disc - Combi 21 only 44
11.7 Recommissioning 44
11.8 Burner components 45
12 FAULT FINDING 46
12.1 Initial checklist 46
12.2 Main fault nding procedures 47
12.3 Poor hot water checklist 49
12.4 Burner fault nding 50
13 SPARE PARTS 51
13.1 Riello RDB 2.2 BX burners 51
14 DECLARATION OF CONFORMITY 54
15 HEALTH AND SAFETY INFORMATION 55
15.1 Insulation materials 55
15.2 Sealant and adhesive 55
15.3 Kerosene and Gas Oil fuels 55
16 END OF LIFE INFORMATION 56
17 PRODUCT FICHE 57
17 GUARANTEE 58
Contents Page 3
1 INTRODUCTION
1.1 HOW A CONDENSING BOILER
OPERATES
During the combustion process, hydrogen and oxygen combine
to produce heat and water vapour. The water vapour produced
is in the form of superheated steam in the heat exchanger. This
superheated steam contains sensible heat (available heat) and
latent heat (heat locked up in the ue gas). A conventional boiler
cannot recover any of the latent heat and this energy is lost to the
atmosphere through the ue.
The Grant Vortex condensing boiler contains an extra heat
exchanger which is designed to recover the latent heat normally
lost by a conventional boiler. It does this by cooling the ue gases
to below 90°C, thus extracting more sensible heat and some of
the latent heat. This is achieved by cooling the ue gases to their
dew point (approximately 55°C).
To ensure maximum efciency, the boiler return temperature
should be 55°C or less, this will enable the latent heat to be
condensed out of the ue gases.
• The boiler will achieve net thermal efciencies of 100%.
To achieve maximum performance from the Grant Vortex boiler,
it is recommended that the heating system is designed so that a
temperature differential of 20°C between the ow and return is
maintained.
The Grant Vortex boiler will however still operate at extremely
high efciencies even when it is not in condensing mode and
therefore is suitable for tting to an existing heating system
without alteration to the radiator sizes. The boiler is capable of a
maximum ow temperature of 78°C.
1.2 BOILER DESCRIPTION
The Grant Vortex Pro Combi range of automatic pressure jet oil
boilers have been designed for use with a sealed central heating
system and will provide domestic hot water at mains pressure.
All boilers are supplied with the control panel and burner factory
tted.
The boilers are suitable for use in a sealed central heating system
only.
All the models in the current Grant Vortex Pro Combi range of
boilers are designed to comply with the maximum NOx emissions*
under the Energy-related Products Directive (ErP).
* From the 26th September 2018, the maximum NOx emissions
for all new oil red boilers (up to and including 400kW for both
new build and replacement boiler installations) is 120mg/kWh.
1.3 FLUE OPTIONS
The boilers can be connected to either a conventional ue system
or a balanced ue system, as required.
1.3.1 FOR CONVENTIONAL FLUE APPLICATIONS
Where a chimney is to be lined - Grant recommends the use
of the Grant ‘Orange’ ue system, specically designed for the
Vortex range of condensing boilers. Refer to Section 9.2 for
further details.
Where a rigid conventional ue - either internal or external - is
required, Grant recommends the use of the Grant ‘Green’ and
‘Orange’ ue system components. As no ue adaptor is supplied
with the boiler it will be necessary to purchase the Grant CF
adaptor kit in order to correctly connect this system to the boiler.
Flue adaptor kit (Grant product code: CFA15/70) is used for all
models as they all use the 100 mm ‘Green’ and ‘Orange’ system
components to construct a ue of maximum vertical height 19
metres.
! NOTE !
The ue system materials and construction MUST be
suitable for use with oil-red condensing boilers. Failure
to t a suitable conventional ue may invalidate the
guarantee on the boiler.
1.3.2 FOR BALANCED FLUE APPLICATIONS
The following ue kits are available from Grant UK. Refer to
Section 9.4.
Yellow system
Standard low level concentric balanced ue - components
available:
• Low level concentric balanced ue short
• Extensions 225 mm, 450 mm and 675 mm
• 90° extension elbow
• 45° extension elbow
• 45° elbow
• Plume diverter kits
Green system
Standard external high level/vertical ue starter kit (room sealed) -
components available:
• External high level/vertical ue starter kit short (room sealed)
• Extensions 150 mm, 250 mm, 450 mm, 950 mm
• Adjustable extension 195 to 270 mm
• 45° elbow
• High level terminal
• Vertical terminal
White system
High level and vertical concentric balanced ue kit- components
available:
• Extensions 225 mm, 450 mm, 950 mm
• Adjustable 275 to 450 mm
• Vertical concentric balanced ue kit
• Extensions 225 mm, 450 mm, 950 mm
• Adjustable extension 275 to 450 mm
• 45° elbow
Red system (for Combi 21, Combi 26 and Combi XS 26 only)
A exible vertical balanced ue system designed to be tted inside
an existing masonry chimney.
Consisting of three sections:
• Concentric white painted ue pipe connected to the boiler
• Vertical concentric exible ue (exible stainless steel ue liner
inside a stainless steel air inlet liner)
• Terminal assembly for chimney top mounting
Flue extensions and 45° elbows from the White system may be
used.
Fitting instructions for the Low level, High level and Vertical
balanced ue systems are supplied with the kits.
Section 1: IntroductionPage 4
1.4 BOILER COMPONENTS
All burners are pre-set for use with kerosene and are supplied
ready to connect to a single pipe fuel supply system with a loose
exible fuel line and 3/8ʺ to 1/4ʺ BSP male adaptor supplied with
the boiler.
If required, an additional exible fuel line (600 mm) and 3/8” to
1/4” BSP male adaptor are available to purchase from Grant UK,
for two-pipe oil supply systems (Grant product code: RBS104).
The temperature of the water leaving the boiler to heat the
radiators is user adjustable.
The setting of the boiler thermostat on the Vortex Pro Combi
boilers has no affect on the hot water performance.
The boiler is tted with an overheat thermostat (which allows
it to be used on a sealed central heating system) which will
automatically switch off the boiler if the heat exchanger exceeds a
pre-set temperature of 110°C ± 3°C.
Figure 1-1 shows the components in the Vortex Pro Combi boilers
and the position of the control panel.
Figure 1-2 shows the details of the control panel.
The control panel is tted with an ON/OFF switch, heating switch,
hot water switch, indicator lights, boiler (heating), pressure gauge
and manual reset for the overheat thermostat.
Expansion vessel
Condensate trap
Burner lock-out button
Figure 1-1: Boiler components (model shown: Vortex Pro Combi 26)
Plug-in
programmer
position
(if fitted)
Boiler
On / Off
switch
Indicator lights Pressure gauge
Hot water pump
Heating
switch
Hot water
switch
Boiler
thermostat
Over heat
reset
(under
black cap)
Figure 1-2: Vortex Pro Combi boiler control panel
Section 1: Introduction Page 5
2 TECHNICAL DATA
2.1 BOILER TECHNICAL DATA
Table 2-1: Boiler technical data
Units Combi XS 26 Combi 21 Combi 26 Combi 36
Water content
(including 32 litre primary store)
Weight (dry) *
Maximum heat output (Kerosene)
Heating system ow and return connections mm 22 22 22 28
Cold water mains inlet mm 15 15 15 22
Domestic hot water outlet mm 15 15 15 22
Minimum ow rate (∆T=10°C) l/h 2,200 1,800 2,200 3,000
Minimum ow rate (∆T=20°C) l/h 1,100 900 1,100 1,500
Pressure relief valve discharge mm 15
Maximum heating system pressure (cold) bar 1.0
Minimum heating system pressure (cold) bar 0.5
Expansion vessel (pre-charged at 1 bar) litres 24
Maximum heating system volume ** litres 255
Minimum domestic hot water ow rate
Maximum domestic hot water temperature °C 65 (factory set)
Maximum mains water inlet pressure bar 8.0
Minimum recommended mains water inlet pressure bar 2.5
Condensate connection 22 mm (only connect plastic pipe)
Flue diameter (conventional) mm 100
Waterside resistance ∆T=10°C mbar 28.5 26.0
Waterside resistance ∆T=20°C mbar 10.0 9.5
Maximum static head m 28
Minimum circulating head m 1
Boiler thermostat range °C 65 to 78
Limit (safety) thermostat shut off temperature °C 111 ± 3
Maximum hearth temperature °C Less than 50
Electricity supply ~230 1ph 50Hz 5A fused
Burner motor power Watts 90
Absorbed motor power kW 0.15
Starting current Amps
Running current Amps 0.85
Oil connection ¼ʺ BSP male (on end of exible fuel hose)
Conventional ue draught
Maximum operating pressure - sealed/open system bar 2.0
Maximum operating pressure - pressure relief valve bar 2.5
Boiler type ON/OFF
* Weight includes burner but excludes ue
litre 42.5 43 48.5 53.5
gal 9.4 9.5 10.7 11.8
kg 181 160 177 200
lb 399 353 390 441
kW 26.0 21.0 26.0 36.0
Btu/h 88,700 71,650 88,700 123,000
2.5 litres/min
(0.55 gal/min)
mbar Minimum: 0.087 - Maximum: 0.37
in wg Minimum: 0.035 - Maximum: 0.15
3.0 litres/min (0.66 gal/min)
Section 2: Technical DataPage 6
2.2 BURNER SETTINGS
! NOTE !
Burners are supplied factory set at the outputs shown.
When commissioning, the air damper must be adjusted to
obtain the correct CO
the data label.
Table 2-2: Burner settings
level and the installer must amend
2
Distance †
15
13
15
17.5
level.
2
Burner
head/
air disc
setting
Boiler
models
(burner
type)
Combi XS 26
(Riello
RDB2.2 BX
VC26)
Combi 21
(Riello
RDB2.2 BX
E15/21)
Combi 26
(Riello
RDB2.2 BX
VC26)
Combi 36
(Riello
RDB2.2 BX
VC36)
Notes:
† Refer to Section 10.2 (Burner Settings: RDB2.2 BX burners)
‡ Flue gas VFR: Flue gas volumetric ow rate
1. The data given above is approximate only and is based on the boiler being used with a low level balanced ue.
2. The above settings may have to be adjusted on site for the correct operation of the burner.
3. Gas Oil is NOT suitable for use with Grant Vortex boiler range
4. The ue gas temperatures given above are ± 10%.
5. When commissioning, the air damper must be adjusted to obtain the correct CO
6. The combustion door test point may be used for CO
Heat output
(kW) (Btu/h) A D
26.0 88,700 0.75/60°EH 8.5 0 - 1 BX 500 N/A -
21.0 71, 60 0 0.60/60°EH 8.0 0 - 1 BX 500 Disc: C -
26.0 88,700 0.75/60°EH 8.5 0 - 1 BX 500 N/A -
36.0 122,80 0 1.00/ 60°ES 9.0 0 - 1 BX 700 N/A -
Nozzle
Oil
pressure
(bar)
2
Smoke
and smoke readings only. Do not use this test point for temperature or efciency readings.
No.
Burner
head
type
Fuel
ow rate
(kg/h)
2.19 75 - 80 12.5 28.5
1.84 75 - 80 12.5 23.0
2.16 75 - 80 12.5 28.5
2.99 75 - 80 12.5 39.5
Flue gas
temp.
(°C)
CO
(%)
2
Flue
gas
VFR ‡
(m³/hr)
2.3 FLUE GAS ANALYSIS
To allow the boiler to be commissioned and serviced, the boiler is supplied with a combustion test point on the front cleaning door.
When this test point is used please note the following:
• The test point is for CO
• The boiler efciency and temperature must be taken from the ue test point on high level, vertical and conventional ue adaptors.
• Concentric low level ues do not contain a test point. The temperature and efciency readings must be taken from the ue terminal.
and smoke readings only.
2
Section 2: Technical Data Page 7
2.4 BOILER DIMENSIONS
LEFT SIDE VIEW
PLAN VIEW
REAR VIEW
99
588
100
699
35
227
75
90
202 210
690 140
RIGHT SIDE VIEW
858
760
307
614
O
31
O
3
1
O
3
1
O
25
INTERNAL DRAIN
TRAP EXIT
(LEFTSIDE
PANEL ONLY)
90
606
O
1
1
0
O
15
5
105
440
106
5
15
0
O
1
1
O
514
257
187 140
90
74
764
690 144
REAR VIEW
90
74
O
2
5
699 135
Figure 2-3: Vortex Pro Combi XS 26 dimensions
PLAN VIEW
192
35
15
1
3
O
*
31
O
100
588
31
O
99
441
LEFT SIDE VIEW
606
859
RIGHT SIDE VIEW
Figure 2-4: Vortex Pro Combi Internal 21 and 26 dimensions
Section 2: Technical DataPage 8
Figure 2-5: Vortex Pro Combi 36 dimensions
RIGHT SIDE VIEW
LEFT SIDE VIEW
PLAN VIEW
REAR VIEW
90
62
62
90
182 250
614
307
O
11
0
O
1
8
5
60
190
556
100
695
106
O
3
1
O
3
1
O
3
1
INTERNAL DRAIN
TRAP EXIT
(LEFTSIDE
PANEL ONLY)
900
783
O
25
177
606
Section 2: Technical Data Page 9
3 OIL STORAGE AND SUPPLY SYSTEM
3.1 FUEL SUPPLY
3.1.1 FUEL STORAGE
The tank should be positioned in accordance with the
recommendations given in BS 5410-1 (Code of Practice for
Oil Firing - Installations up to 45kW output capacity for space
heating and hot water supply purposes). This gives details of the
requirements for suitable oil tank construction, tank installation,
tank bases, re protection and secondary containment.
For installations of greater than 45kW output capacity, the tank
should be installed accordance with BS 5410-2.
Oil storage tanks should comply with the following standards:
• Plastic tanks OFT T100
• Steel tanks OFT T200
! CAUTION !
A galvanised tank must not be used.
! NOTE !
Plastic tanks should be stood on a rm non-combustible
base that adequately and uniformly supports the weight of
the tank over its entire base area.
The tank capacity should be selected to suit the appliance rated
output. Refer to BS5410-1 for guidance.
3.1.2 FUEL PIPES
Fuel supply pipes should be either copper or steel. Galvanised
pipes or ttings should not be used.
Plastic oil supply pipe conforming to BS EN 14125 can be used
for underground pipe runs, but must not be used above ground.
All soft copper pipe connections should preferably be made using
ared ttings. If compression ttings are to be used, a suitable
pipe insert must be tted into the pipe end.
Soft soldered connections must NOT be used on oil supply
pipework.
Fuel supply pipework should be of a suitable diameter, depending
on the type of oil supply system being used. Refer to information
given in sections 3.1.3, 3.1.4 or 3.1.5.
Run pipes as level as possible to prevent air being trapped. Take
the most direct route possible from tank to burner whilst locating
the pipe where it will be protected from damage.
Pipes should be supported to prevent sagging and sleeved where
they pass through a wall.
A metal body fuel lter of no better than 70 μm (micron) must be
tted in the oil supply pipe close to the tank. This should be tted
with sufcient clearance around and below it to allow easy access
for maintenance.
An isolating valve should also be tted at the tank, before the lter,
to allow the oil supply to be shut off for the lter to be serviced.
A second lter (15 μm for Kerosene) must be located closer to the
burner to protect the burner pump and nozzle from contamination.
Refer to Figures 3-1 to 3-3.
A remote sensing re valve must be installed in the fuel supply
line in accordance with BS540-1.
A fusible wheelhead type combined isolating/re valve MUST
NOT be used in place of a remote sensing re valve.
The re valve must be located outside; just before the oil line
enters the building, with the re valve sensor located above the
burner.
A spring clip for mounting the sensor is provided with the boiler.
This should be xed with the screw provided, using the small hole
in the front panel of the boiler.
The re valve should be located after the second (15 micron) lter,
i.e. between the lter and the point at which the oil line enters the
building. Refer to Figures 3-1 to 3-3.
The re valve must have an operating temperature of between
90 and 95°C to avoid unnecessary nuisance shut-offs to the oil
supply.
A exible fuel hose and ¼ʺ isolating valve are supplied lose with
the boiler, to make the final connection to the burner.
If a two-pipe system or deaerator is to be used, the following
additional items will be required:
• Flexible fuel hose ⅜ʺ male x ¼ʺ female, 900 mm long
(product code: RBS36)
• ⅜ʺ x ¼ʺ BSP adaptor (product code: RBS35)
• ¼ʺ isolating valve (product code: ISOLATION1/4)
These are available to purchase from Grant UK.
Metal braided flexible fuel hoses should be replaced ANNUALLY
when the boiler is serviced.
Long life flexible fuel hoses should be inspected annually and
replaced, if necessary, or after a maximum five years service life.
3.1.3 SINGLE PIPE (GRAVITY) SYSTEM (REFER TO FIGURE 3-1)
Head A (m)
0.5 10 20
1.0 20 40
1.5 40 80
2.0 60 100
If the storage tank outlet is at least 300 mm above the level of the
level of the burner oil pump, a single pipe (gravity) system should
be used.
The maximum height of the oil level above the burner oil pump
when the tank is full, must not exceed four metres. If this height
is exceeded, a pressure reducing valve must be tted in the oil
supply pipe between the tank and the burner oil pump.
The maximum length of pipe run from the tank to the burner is
limited by the minimum head of oil (the height of the tank tank
outlet above the burner oil pump).
Maximum pipe run (m)
10 mm OD pipe 12 mm OD pipe
3.1.4 TWO PIPE SYSTEM (REFER TO FIGURE 3-2)
Head A (m)
0 35 100
0.5 30 100
1.0 25 100
1.5 20 90
2.0 15 70
3.0 8 30
3.5 6 20
If the storage tank outlet is below the level of the burner oil pump,
a two pipe (sub gravity) system can be used.
The return pipe should be at the same level as the tank outlet,
between 75 to 100 mm above the base of the tank. The return
pipe should be a sufcient distance from the tank outlet so as to
prevent any sediment disturbed by the return entering the supply
pipe from the tank.
A non-return valve should be tted in the supply pipe, along with
a re valve and lters (refer to section 3.1.2 - fuel pipes). A nonreturn valve should also be tted in the return pipe if the top of the
tank is above the burner oil pump.
The maximum suction height (from the tank outlet to the level of
the burner oil pump), must not exceed 3.5 metres.
The pump vacuum should not exceed 0.4 bar. Beyond this limit,
gas is released from the oil.
Maximum pipe run (m)
10 mm OD pipe 12 mm OD pipe
Section 3: Oil Storage and Supply SystemPage 10
5
Min
7
9
12
8
Figure 3-1: Single pipe (gravity) system
7
9
12
8
3
2
4
2
1
4m Max
6
300mm
Min
5
10
4
2
6
150mm
Figure 3-2: Two pipe system
10
23
1
5
7
11
9
12
4
2
6
10
123
8
Figure 3-3: De-aeration device system
Key to oil supply diagrams
1 Oil tank 5 External wall 9 Burner
2 Isolating valve 6 Oil lter (15μm max. ltration size) 10 Non-return valve
3 Oil strainer 7 Fire valve sensor 11 De-aerator*
4 Fire valve to BS5410 8 Oil pump 12 Appliance isolation valves
* Position of de-aeration device must be level with or above the oil pump
3.5m Max
3.5m Max
Section 3: Oil Storage and Supply System Page 11
For guidance on the installation of top outlet fuel tanks and
suction oil supply pipe sizing, refer to OFTEC Technical Book 3:
Storage and Supply, available for purchase from OFTEC.
If a two-pipe system is to be used, the following additional items
will be required:
• Flexible fuel hose ⅜ʺ male x ¼ʺ female, 900 mm long
(product code: RBS36)
• ⅜ʺ x ¼ʺ BSP adaptor (product code: RBS35)
• ¼ʺ isolating valve (product code: ISOLATION1/4)
These are available to purchase from Grant UK.
3.1.5 SINGLE PIPE (SUCTION) SYSTEM WITH
DEAERATOR - (REFER TO FIGURE 3-3)
If the storage tank outlet is below the level of the burner oil pump,
an alternative to the two pipe (sub gravity) system is the single
pipe (suction) system using a deaerator, e.g. a ‘Tiger Loop’
device.
The deaerator creates a loop with the burner oil pump, with the oil
being circulated through the pump out to the deaerator and back
to the pump. Any air in the single pipe lift from the tank is removed
from the oil, collected in the deaerator and then discharged to
outside.
! WARNING !
To prevent any fuel vapour being discharged within
the building, the deaerator must be tted outside, in
accordance with BS 5410-1, unless it is specically
designed to be installed inside.
The de-aerator must be mounted vertically at the same level as
(or above) the burner oil pump. Refer to Figure 3-3.
RETURN
FROM PUMP
Tiger Loop
3.2 BURNER OIL CONNECTION
! WARNING !
The blanking plug supplied in the inlet (suction) port is
plastic and will not provide an oil tight seal when the pump
is running.
Ensure that the supply from the tank is connected to this
port and that the plastic plug is discarded.
The burner fuel pump is supplied factory set for use with a single
pipe (gravity) oil supply system.
For ease of access to the burner oil pump connections, the burner
should be removed from the boiler as follows:
1. Remove the red plastic burner cover.
2. Unscrew and remove the single burner fixing nut from the
stud on the burner flange (at the top of the burner) using a 13
mm spanner. Retain the fixing nut for re-fitting the burner.
3. Carefully withdraw the burner from the boiler.
3.2.1 SINGLE PIPE (GRAVITY) CONNECTION -
REFER TO FIGURE 3-5
Connect the oil supply to the burner oil pump as follows:
1. Unscrew and remove the plastic blanking plug from the
suction port of the burner oil pump and discard it.
2. Fit the nut of the elbow connection on the exible fuel hose
(supplied with the boiler) into the suction port and tighten.
3. Fit the ¼ʺ isolating valve (supplied with the boiler) to the end
of the rigid oil supply pipe using a tting to suit the pipe size
and type (not supplied).
4. Connect the other end of the exible fuel hose to the isolating
valve using the ⅜ʺ x ¼ʺ BSP adaptor (supplied with the
boiler).
5. Re-t the burner to the boiler.
SUPPLY
TO PUMP
Figure 3-4: Tiger loop de-aeration device
An external deaerator must not be tted within 500 mm of a ue
terminal.
Always follow the manufacturers installation instructions supplied
with the deaerator.
To use a de-aertor, the following additional items will be required:
• Flexible fuel hose ⅜ʺ male x ¼ʺ female, 900 mm long
(product code: RBS36)
• ⅜ʺ x ¼ʺ BSP adaptor (product code: RBS35)
• ¼ʺ isolating valve (product code: ISOLATION1/4)
These are available to purchase from Grant UK.
1/4" BSP female
connections
SUPPLY
FROM TANK
Section 3: Oil Storage and Supply SystemPage 12
8
6
1
Figure 3-5: Riello RDB pump
Figure 3-6: Key to Riello RDB pump
Item Description
1 Inlet (suction) port
2 Return port
3 By-pass screw
4 Pressure gauge port
5 Pressure adjustment
6 Vacuum gauge port
7 Solenoid
8 Auxiliary pressure test point
3.2.2 TWO PIPE CONNECTION
7
5
3
2
For either a two pipe (sub gravity) or a single pipe (suction)
system with a deaerator, the following additional items will be
required:
• Flexible fuel hose ⅜ʺ male x ¼ʺ female, 900 mm long
(product code: RBS36)
• ⅜ʺ x ¼ʺ BSP adaptor (product code: RBS35)
• ¼ʺ isolating valve (product code: ISOLATION1/4)
These are available to purchase from Grant UK.
Connect the oil supply to the burner oil pump as follows:
1. Fit the exible fuel hose (supplied with the boiler) to the
suction port of the burner oil pump, as detailed in Section
4
3.2.1.
With either a two pipe (sub gravity) system or a single pipe
(suction) system with a deaerator, the by-pass screw (supplied
with the boiler) must be tted to the burner oil pump as follows:
1. Unscrew and remove the blanking plug from the return port
on the burner oil pump and discard it.
2. Fit the by-pass screw into the threaded hole (inside the return
port) and fully screw it in using an allen key.
3. Fit the nut of the elbow connection on the exible fuel hose
into the return port and tighten.
4. Fit the ¼ʺ isolating valve (not supplied) to the end of the rigid
oil return pipe (to the deaerator or oil tank) using a tting to
suit the pipe size and type (not supplied).
5. Connect the other end of the exible fuel hose (not supplied)
to the isolating valve using a ⅜ʺ x ¼ʺ BSP adaptor (not
supplied).
6. Re-t the burner to the boiler.
Section 3: Oil Storage and Supply System Page 13
4 INSTALLATION
4.1 INTRODUCTION
The boiler is supplied already fully assembled in a carton which
is carefully packed with packing materials. The installation
procedure therefore begins with unpacking of the packed boiler.
4.2 BOILER LOCATION
The boiler must stand on a rm, level and non-combustible
surface capable of supporting the boiler when full of water. Refer
to Section 2.1 for weights.
It does not require a special hearth as the temperature of the
boiler base is less than 50°C.
Sufcient clearance must be allowed at the front of the boiler to
remove the burner and bafes for servicing.
The Vortex Pro Combi XS 26, Combi 21 and 26 boilers can be
serviced from the front, but it is preferable for any worktop above
the boiler to be removable.
The Vortex Pro Combi 36 requires a removable section of worktop
above the boiler to provide access to components on top of the
boiler and for servicing.
Care should be taken when siting the condensate trap if it is to be
tted outside the boiler. Refer to Section 6.9.
4.3 REGULATIONS COMPLIANCE
! NOTE !
systems. Code of practice for domestic heating and hot water
supply)
• BS 2869 (Fuel oils for agricultural, domestic and industrial
engines and boilers. Specication)
4.4 HEATING SYSTEM DESIGN
CONSIDERATIONS
! WARNING !
Before starting any work on the boiler or fuel supply,
please read the Health and Safety information given in
Section 15.
To achieve the maximum efciency possible from the Grant Vortex
boiler, the heating system should be designed to the following
parameters:
RADIATORS:
• Flow temperature 70°C
• Return temperature 50°C
• Differential 20°C
Size radiators with a mean water temperature of 60°C.
Design system controls with programmable room thermostats
or use weather compensating controls to maintain return
temperatures below 55°C.
Failure to install and commission appliances correctly may
invalidate the boiler guarantee.
Installation of a Grant Vortex boiler must be in accordance with
the following recommendations:
• Building Regulations for England and Wales, and the Building
Standards for Scotland issued by the Department of the
Environment and any local Byelaws which you must check
with the local authority for the area.
• Model and local Water Undertaking Byelaws.
• Applicable Control of Pollution Regulations.
• National Building Regulations and any local Byelaws.
• Model Byelaws and the Water Supply Regulations.
• The following OFTEC requirements:
• OFS T100 Polythene oil storage tanks for distillate fuels.
• OFS T200 Fuel oil storage tanks and tank bunds for use
with distillate fuels, lubrication oils and waste oils.
Further information may be obtained from the
OFTEC Technical Book 3 (Installation requirements
for oil storage tanks) and OFTEC Technical Book 4
(Installation requirements for oil red boilers).
The installation should also be in accordance with the latest
edition of the following British Standard Codes of Practice (and
any relevant amendments):
• BS 5410-1 (Code of practice for oil ring. Installations up
to 45 kW output capacity for space heating and hot water
supply purposes)
• BS EN 12828 (Heating systems in buildings. Design for
water-based heating systems)
• BS EN 12831-1 (Energy performance of buildings. Method
for calculation of the design heat load)
• BS EN 14336 (Heating systems in buildings. Installation and
commissioning of water based heating systems)
• BS 7593 (Code of Practice for treatment of water in domestic
hot water central heating systems)
• BS 7671 (Requirements for Electrical installations, IET Wiring
Regulations)
• BS 7291 (Thermoplastics pipe and tting systems for hot and
cold water for domestic purposes and heating installations in
buildings. General requirements)
• BS 7074-1 (Application, selection and installation of
expansion vessels and ancillary equipment for sealed water
! NOTE !
The boiler should not be allowed to operate with return
temperatures of less than 40°C when the system is up to
temperature.
The use of a pipe thermostat is recommended to control the return
temperature when using weather compensating controls.
UNDERFLOOR:
• Flow temperature 50°C
• Return temperature 40°C
• Differential 10°C
In underoor systems, it is essential that the return temperature
must be maintained at or above 40°C to prevent internal corrosion
of the boiler water ‘primary’ jacket.
Refer to Section 2.2 for the size and type of the connections and
Section 5 for the position of the connections.
4.5 PIPEWORK MATERIALS
The Grant Vortex boiler is compatible with both copper and plastic
pipe. Where plastic pipe is used it must be of the oxygen barrier
type and be the correct class (to BS 7291-1) for the application
concerned.
On either sealed or open-vented systems; where plastic pipe is
used a minimum of ONE metre of copper pipe (or as per pipe
manufacturers instructions) MUST be connected between both
the boiler ow and return connections and the plastic pipe.
! NOTE !
Do not connect plastic pipe directly to the boiler.
Grant UK does not accept any responsibility for any damage,
however caused, to plastic piping or ttings.
SEALED SYSTEMS
If plastic pipe is to be used, the installer must check with the
Section 4: InstallationPage 14
plastic pipe manufacturer that the pipe to be used is suitable for
the temperature and pressures concerned.
Plastic pipe must be Class S to BS 7291-1.
! WARNING !
When plastic pipe is used, the system MUST incorporate
a low level pressure switch to shut off power to the boiler
if the system pressure drops below 0.2 bar. A suitable low
pressure switch kit is available to purchase from Grant UK
(product code: MPCBS62).
UNDERFLOOR PIPEWORK
Plastic pipe may be used on underoor oor systems where the
plastic pipe is tted after the thermostatic mixing valve. Copper
tube must be used for at least the rst metre of ow and return
primary pipework between the boiler and the underoor mixing/
blending valves.
4.6 CONNECTIONS
4.6.1 FLOW AND RETURN CONNECTIONS
Refer to Section 5.
4.6.2 CONDENSATE CONNECTION
The condensate trap is supplied loose in the burner box and
needs to be tted as shown in Figure 6-2.
Refer to Section 6 for details of the condensate disposal pipework.
a 24 litre expansion vessel located in the front of the boiler.
The expansion vessel tted is supplied with a charge pressure of
1.0 bar (equivalent to a maximum static head of 10.2 metres). The
charge pressure must not be less than the actual static head at
the point of connection.
Do not pressurise the vessel above 1.5 bar.
! NOTE !
The air pressure in the vessel must be checked annually.
The central heating system volume, using the expansion
vessel as supplied, must not exceed the recommended
volumes. Refer to Section 2.1. If the system volume is
greater, an extra expansion vessel (complying with BS
4841) must be tted as close as possible to the central
heating return connection on the boiler. The charge
pressure of the extra vessel must be the same as the
vessel tted in the boiler.
Refer to BS 7074-1 for further guidance.
The air charge pressure may be checked using a tyre pressure
gauge on the expansion vessel Schraeder valve.
The vessel may be re-pressurised using a suitable pump. When
checking the air pressure the water in the heating system must be
cold and the system pressure reduced to zero.
4.10 FILLING THE HEATING SYSTEM
Refer to Section 7.2 (lling the heating system).
4.7 PREPARATION FOR
INSTALLATION
1. Carefully remove the packaging from the boiler and remove it
from the transit pallet.
2. Pull off the boiler front panel and remove the literature pack.
3. Lift off the two parts of the case top and remove the water
connecting ttings.
4.8 INSTALLING THE BOILER
1. Having decided upon the position of the boiler and type of
ue, prepare the wall as described in Section 9. Ensure
that the ue terminal position complies with the necessary
clearances.
2. Make the water connections as described in Section 5. If
access will be restricted, make any connections to the boiler
before placing it in its nal position. Refer to Section 7 if the
boiler is to be used on a sealed system.
! NOTE !
If using a balanced ue system - install the balanced ue
system before connecting the heating system pipework to
the boiler. Once the ue system is tted then complete the
water connections and ll the heating system.
3. Ensure the requirements are met for the disposal of
condensate as described in Section 6.
4. Connect the power supply as described in Section 8.
5. Connect the ue and ensure there is an adequate air supply
as described in Section 9.
4.11 BEFORE YOU COMMISSION
To avoid the danger of dirt and foreign matter entering the boiler
the complete heating system should be thoroughly ushed
out – both before the boiler is connected and then again after
the system has been heated and is still hot. This is especially
important where the boiler is to be installed on an older system.
For optimum performance after installation, the boiler and the
associated heating system must be ushed in accordance with
the guidelines given in BS 7593 (Treatment of water in domestic
hot water central heating systems). This must involve the use
of a proprietary cleaner, such as Sentinel X300 (new systems),
Sentinel X400 (existing systems), or Fernox Restorer.
After cleaning, it is vitally important that all traces of the cleaner
are thoroughly ushed from the system.
For long term protection against corrosion and scale, after
cleaning/ushing a suitable inhibitor should be added to the
system water, such as Sentinel X100 or Fernox MB-1, in
accordance with the manufacturers’ instructions.
Failure to follow the above will invalidate the guarantee.
If the boiler is installed in a garage or out house, in order to
provide further protection should there be a power failure in cold
weather, a combined anti-freeze and corrosion inhibitor can
be used such as Sentinel X500 or Fernox Alphi-11. Follow the
manufacturers’ instructions supplied to achieve the level of antifreeze protection required.
For details of the Sentinel Products visit www.sentinel-solutions.
net and for Fernox products visit www.fernox.com.
Grant UK strongly recommends that a Grant Mag One in-line
magnetic lter/s (or equivalent*) is tted in the heating system
pipework. This should be installed and regularly serviced in
accordance with the lter manufacturer’s instructions.
* As measured by gauss. The MagOne magnetic lter has a gauss
value of 12000.
4.9 EXPANSION VESSEL
The Combi XS 26 model is supplied with a separate 24 litre
expansion vessel (and mounting bracket), to be tted in a
convenient position externally to the boiler casing.
The vessel is supplied with an 800mm exible hose with a ½”
BSP male thread.
Using a suitable tting (not supplied), this vessel must be
connected to the heating system, via the exible hose, in a
convenient position where it can be readily accessed for servicing.
The Combi 21, Combi 26 and Combi 36 models are supplied with
4.12 COMPLETION
Following installation of the boiler, instruct the user in the
operation of the boiler, the boiler controls, the heating controls and
the safety devices.
Please ensure that the OFTEC CD/10 installation completion
report (provided with the boiler) is completed in full, leaving the
top copy with the user and retain the carbon copy for your own
records.
Ensure that the User Handbook (supplied with the boiler) is
handed over to the user.
Section 4: Installation Page 15
5 PIPE CONNECTIONS
5.1 WATER CONNECTIONS
Water connections may be from the rear, left or right hand side. If
using low level side exit ue, connections must be on the opposite
side to the ue.
FLOW AND RETURN CONNECTIONS
All models are supplied with a push-t elbow connection for the
heating ow and return:
• Combi XS 26, Combi 21 and 26 - 22 mm
• Combi 36 - 28 mm
HOT WATER CONNECTIONS
All models are supplied with push-t elbow connections for the
cold water mains inlet pipe and hot water outlet pipe:
• Combi XS 26, Combi 21 and 26 - 15 mm
• Combi 36 - 22 mm
Boiler flow
sensor and
overheat
thermostat
bulb
! CAUTION !
All pipes to be tted into the push-t connectors provided
should be cut using a pipe slicer or pipe cutter - to leave
the pipe ends with a slight radius and free from any burrs
or sharp edges.
Pipes to be used with these ttings should not be cut
square using a hacksaw.
ALL MODELS
A 15 mm discharge pipe must be connected to the safety valve
outlet connection. The pipework between the safety valve and the
boiler must be unrestricted, that is, no valves. The discharge pipe
should be run to the outside of the building and terminate so that it
cannot cause injury to persons or property.
A drain tap is provided at the bottom on the front of the boiler (and
also on the hot water store on the Vortex Pro Combi).
Heating flow
connection
Heating circulating
pump
Safety valve
outlet
Manual
air vent
Heating
return
Safety valve
Automatic air vent
Cold water inlet
Cold water inlet
isolating valve
Flow switch
Primary return
isolating valve
Automatic
air vents
Non return
valve
Figure 5-1: Vortex Pro Combi pipe positions
Section 5: Pipe ConnectionsPage 16
5.2 MAKING THE WATER
CONNECTIONS
Flow and return pipework can be routed to either side of the
boiler, dependant on the ue system used, from the push-t
elbows (supplied) on the ow and return connection. Refer to
Figure 5-1.
Holes are provided in the rear of the casing side panels to allow
the condensate pipe to be run through the back of the boiler. It will
be necessary to remove the back panel from the boiler casing to
t this pipework, and to ret the panel before placing the boiler in
its nal position. Refer to Figure 6-3.
If access will be restricted, make any connections to the boiler
before placing it in its nal position. If using a balanced ue
system - Install the balanced ue system before connecting the
heating system pipework to the boiler.
5.3 DOMESTIC HOT WATER SYSTEM
To maintain a longer and more consistent hot water temperature,
a ow restrictor is factory tted to all models except the Vortex Pro
Combi 36, to limit the ow rate to approximately 15 litres/minute.
The ow restrictor is located in the outlet side of the cold water
inlet isolating valve.
The incoming mains water pressure should be between 1 and 8
bar to ensure efcient operation.
! NOTE !
If the pressure is above 8 bar a pressure reducing valve
must be tted.
The boiler may still operate down to a pressure of 1.0 bar but with
a reduced ow rate. The minimum ow rate needed for the ow
switch to operate is 3 litres/minute.
To ensure economic use, the pipe runs between the boiler and
hot taps should be as short as possible and in 15 mm copper pipe
or 22 mm for the Vortex Pro Combi 36 only. Where possible the
pipework should be insulated to reduce heat loss.
All taps and mixing valves used in the domestic hot water system
must be suitable for operating at a mains pressure of up to 8 bar.
If required, a shower may be tted in the domestic hot water
system. It is recommended that thermostatically controlled
shower valves are used to protect against a ow of water at too
high a temperature. If a xed head type shower is used, no antisyphonage devices are required. If a loose or exible head type
shower is used, it must be arranged so that the head cannot fall
closer than 25 mm above the top of the bath, thereby preventing
immersion in the bath water. If this is not practicable, an anti-
syphonage device must be tted at the point of the exible hose
connection.
The supply of hot and cold mains water direct to a bidet is allowed
(subject to local Water Undertaking requirements) provided
that the bidet is of the overrim ushing type. The outlets should
be shrouded and unable to have a temporary hand held spray
attached.
Arrangements for antisyphonage are not necessary.
Before the mains water supply pipe is connected to the boiler, it
should be thoroughly ushed out to avoid the danger of dirt or
foreign matter entering the boiler.
The mains water connection to the boiler must be the rst
connection from the mains supply.
5.4 TO USE THE WATER HARDNESS
KIT
! NOTE !
A water hardness test kit is supplied with the boiler. Should
the total hardness of the water supply exceed 125 ppm,
an in-line scale inhibitor should be tted in the cold water
supply to the boiler.
Consult the local Water Undertaking if in doubt.
Do not immerse the test strip in running water and avoid
contact.
1. Fill a clean container with a sample of water from the mains
cold water supply to the boiler.
2. Immerse the test strip in the water for approximately one
second, ensuring that all the test zones are fully wetted.
3. Shake off the surplus water and wait for one minute.
4. Assess the colouration of the test zones using the following
chart.
Figure 5-2: Key to water hardness
Green
areas
Note: 1mg/l = 1 ppm (part per million)
If the hardness reading is found to be in the medium to very hard
range (the shaded area), it is essential that some form of water
conditioner or softener is tted to reduce scale formation within
the combination boiler. Failure to do so may invalidate both the
manufacturers guarantee and any extended guarantee covering
the appliance.
The water conditioner or softener should be tted to the cold
water supply serving the appliance and in accordance with the
manufacturer’s instructions. Grant UK cannot be held responsible
for any damage or misuse caused by the tting of any water
conditioning device.
Violet
areas
4 0 Very soft <50 mg/l calcium carbonate
3 1 Soft <70 mg/l calcium carbonate
2 2 Medium <125 mg/l calcium carbonate
1 3 Hard <250 mg/l calcium carbonate
0 4 Very hard <370 mg/l calcium carbonate
Hardness Total hardness mg/l (ppm)
! CAUTION !
Please protect the domestic hot water system from
harmful effects of scale. Problems caused by the buildup of limescale are not covered under the terms of the
guarantee.
Section 5: Pipe Connections Page 17
32 mm waste pipe external to the building
and 50 mm from the bottom
away from the property.
6 CONDENSATE DISPOSAL
6.1 GENERAL REQUIREMENTS
When in condensing mode the Grant Vortex boilers produce
condensate from the water vapour in the ue gases.
This condensate is moderately acidic with a pH value of around
3.27 (similar to orange juice).
Provision must be made for the safe and effective disposal of this
condensate.
Condensate can be disposed of using one of the following
methods of connection:
Internal connection (preferred option)
• into an internal domestic waste system (from kitchen sink,
washing machine, etc.)
• directly into the soil stack
External connection
• into an external soil stack
• into an external drain or gulley
• into a rainwater hopper (that is part of a combined system
where sewer carries both rainwater and foul water)
• purpose made soakaway
All condensate disposal pipes must be tted with a trap - whether
they are connected internally or externally to a domestic waste
system/soil stack or run externally to a gully, hopper or soakaway.
6.2 CONNECTIONS
Connections into a rainwater hopper, external drain or gulley
should be terminated inside the hopper/drain/gulley below the grid
level but above the water level.
! CAUTION !
Condensate disposal pipes must not be connected
directly into rainwater downpipes or to waste/soil systems
connected to septic tanks.
Condensate should not be discharged into ‘grey water’ systems
that re-use water used in the home (not including water from
toilets).
It should be noted that connection of a condensate pipe to the
drain may be subject to local Building Control requirements.
6.3 PIPEWORK
Condensate disposal pipework must be plastic (plastic waste or
overow pipe is suitable).
! NOTE !
Copper or steel pipe is NOT suitable and MUST NOT be
used.
Condensate disposal pipes should have a minimum ‘nominal’
diameter of 22 mm (¾ʺ) - e.g. use 21.5 mm OD polypropylene
overow pipe.
Condensate disposal pipes must be tted with a fall (away from
the boiler) of at least 2.5° (~45 mm fall per metre run).
! NOTE !
Where it is not possible for the pipe to fall towards the
point of discharge - either internally into a waste system
or externally to a gulley (e.g. for boilers installed in a
basement), it will be necessary to use a condensate pump.
Condensate disposal pipes should be kept as short as possible
and the number of bends kept to a minimum.
Pipes should be adequately xed to prevent sagging, i.e. at no
more than 0.5 metre intervals.
6.4 EXTERNAL PIPEWORK
Ideally, external pipework, or pipework in unheated areas, should
be avoided. If unavoidable, external pipework should be kept as
short as possible (less than 3 metres) and 32 mm waste pipe
used to minimise the risk of ice blocking the pipe in freezing
conditions.
The number of bends, ttings and joints on external pipes should
be kept to a minimum to reduce the risk of trapping condensate.
! NOTE !
For boilers installed in an unheated area such as a loft,
basement, outhouse or garage, all condensate pipework
should be as ‘external’.
The pipework should be insulated using suitable
waterproof and weather resistant insulation.
100 mm plastic tube
Figure 6-1: Purpose made condensate soakaway
Cement seal
Minimum 2.5 fall
Sealed end Backfill with 10 mm
limestone chippings
O
Ground level
25 mm
300 mm
400 mm
min.
Two rows of 3 x 12 mm
holes at 25 mm centres
of the tube. Holes facing
Section 6: Condensate DisposalPage 18
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