FOR YOUR SAFETY
If you smell gas:
1. Open windows.
®
2. DO NOT try to light any appliance.
3. DO NOT use electrical switches.
4. DO NOT use any telephone in
your building.
5. Leave the building.
DualAir
6. Immediately call your local gas
supplier after leaving the building.
Follow the gas supplier’s
instructions.
7. If you cannot reach your gas
supplier, call the Fire Department.
Heating and Cooling Units
Installation, Commissioning,
Operation & Service Manual
WARNING
DAT75
DAT90
DAT100
DAT115
Fire Hazard
Do not store or use petrol or other
flammable vapours and liquids in the
vicinity of this or any other appliance.
Some objects will catch fire or explode
when placed close to heater.
Failure to follow these instructions can
result in death, injury or property
damage.
Installer
WARNING
Please take the time to read and understand
these instructions prior to any installation.
Installer must give a copy of this manual to the owner.
Improper installation, adjustment, alteration, service
or maintenance can result in death, injury or property
damage. Read the installation, operation and service
manual thoroughly before installing or servicing
this equipment.
Owner
Keep this manual in a safe place in order to provide
your serviceman with necessary information.
Installation must be done by a registered installer/
contractor qualified in the installation and service
of gas-fired heating equipment or your gas supplier.
Roberts-Gordon Europe Limited
Unit A, Kings Hill Business Park
Darlaston Road, Wednesbury
West Midlands WS10 7SH UK
Telephone: +44 (0)121 506 7700
Fax: +44 (0)121 506 7701
Service Telephone: +44 (0)190 249 8733
Service Fax: +44(0)190 240 1464
E-mail: [email protected]
Quality in Any Language™
E-mail: [email protected]
P/N X527 Rev C 10/07
© Copyright 2007 Roberts-Gordon, LLC
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TABLE OF CONTENTS
SECTION 1: Heater Safety......................................................2 SECTION 12: User Instructions............................................25
3.2 Location and Suspension ............................................3 SECTION 13: Servicing.........................................................28
3.9 Coil Condense Drain....................................................3 SECTION 14: Conversion Between Gases..........................30
4.3 Technical Data Table - Heater Section.........................7 SECTION 15: Troubleshooting .............................................31
Static Pressure.............................................................8
15.2 Troubleshooting For Automatic Ignition Burner
Systems ...................................................................32
6.1 Flue Installation.......................................................... 10 SECTION 16: Removal and Replacement Parts..................36
6.4 Converting from Top to Side Terminations for Flue
and Air Intake ............................................................ 10
© 2007 Roberts-Gordon, LLC
All rights reserved. No part of this work covered by the copyrights herein may be reproduced
or copied in any form or by any means - graphic, electronic, or mechanical, including
photocopying, recording, taping or information storage and retrieval systems - without the
written permission of Roberts-Gordon, LLC.
Printed in U.K.
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TABLE OF FIGURES
Figure 2: Installation Clearances and Clearances to
Combustibles .............................................................4
Rooms...................................................................... 13
Figure 11: Gas Connection with Stainless Steel Flex
Connector............................................................... 15
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Product Approval
ROBERTS GORDON® appliances have been tested and CE certified as complying with the essential
requirements of the Gas Appliance Directive, the Low Voltage Directive, the Electromagnetic
Compatibility Directive and the Machinery Directive for use on natural gas and LPG when installed,
commissioned and maintained in accordance with these instructions.
These instructions refer to appliances designed to operate in the European Union.
Appliances designed for other countries (Non-European Union) are available on request.
This appliance must be installed in accordance with the local and national codes in force and used
only in a sufficiently ventilated space, as specified in these instructions.
Before installation, check that the local gas distribution systems, nature of gas and pressure, and
adjustment of the appliance are compatible.
1
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 1: HEATER SAFETY
Your Safety is Important to Us!
2.1 Clearances to Combustibles
This symbol is used throughout the
manual to notify you of possible fire,
electrical or burn hazards. Please pay
special attention when reading and
following the warnings in these sections.
In all situations, clearances to combustibles must be
maintained. Caution must be used when running the
DualAir® unit near combustible materials such as
wood, paper, rubber, etc. A wall tag (P/N 91040089)
is on the back cover of this manual as a permanent
reminder of the safety instructions and the
Installation, service and annual inspection of the
importance of the required clearances to
DualAir® unit must be done by a registered installer/
contractor qualified in the installation and service of
gas-fired heating equipment.
combustibles. Affix the tag on a wall near the
DualAir® unit.
2.2 Corrosive Chemicals
Read this manual carefully before installation,
operation, or service of this equipment.
This DualAir® unit is designed for heating and
cooling non-residential indoor spaces. Do not install
in residential spaces. These instructions, the layout
drawing, local codes and ordinances, and applicable
standards that apply to gas piping, electrical wiring,
venting, refrigerant installation, etc. must be
thoroughly understood before proceeding with the
installation.
CAUTION
Do not use heater in an area containing corrosive
chemicals.
Corrosive chemicals will damage the burner and
heat exchanger parts.
Failure to follow these instructions can result in
property damage.
SECTION 2: INSTALLER RESPONSIBILITY
• To supply and install a suitable condenser unit
along with associated refrigerant circuits in
accordance with the requirements of
all relevant local and national codes.
• To install the DualAir® unit, as well as the gas
Roberts-Gordon cannot be responsible for ensuring
that all appropriate safety measures are undertaken
prior to installation; this is entirely the responsibility
of the installer. It is essential that the contractor, the
sub-contractor, or the owner identifies the presence
of combustible materials, corrosive chemicals or
halogenated hydrocarbons* anywhere in the
and electrical supplies, in accordance with appli- premises.
cable specifications and codes. Roberts-Gordon
recommends the installer contact a local
building inspector, Fire Officer or insurance
company for guidance.
* Halogenated Hydrocarbons are a family of chemical
compounds characterized by the presence of halogen
elements (fluorine, chlorine, bromine, etc.). These com-
pounds are frequently used in refrigerants, cleaning
agents, solvents, etc. If these compounds enter the air
supply of the burner, the lifespan of the DualAir® unit
components will be greatly reduced. Warranty will be
invalid if the heater is exposed to halogenated hydrocar-
bons.
• To use the information given in the manual
together with the local and national codes to
perform the installation.
• To install the DualAir® unit in accordance with the
clearances to combustibles of this DualAir® unit.
2.3 National Standards and Applicable Codes
All appliances must be installed in accordance with
the latest revision of applicable standards and local
and national codes. This refers also to the electric,
gas, refrigerant and venting installation. Note:
Additional standards for installations in public
garages, aircraft hangars, etc. may be applicable.
• To furnish all needed materials not furnished
as standard equipment.
• To plan location of supports, flues and air
intakes.
• To provide access for servicing.
• To provide the owner with a copy of this
Installation, Commissioning, Operation and
Service Manual.
• To never use the DualAir® unit as support for lad-
der or other access equipment and never hang
or suspend anything from heater.
• To ensure that there is sufficient ventilation in the
area to comply with the requirements of
all relevant local and national codes.
2
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SECTION 3: CRITICAL CONSIDERATIONS
SECTION 3: CRITICAL CONSIDERATIONS
3.1 Basic Information
3.7 Electrical Supply
The CTUD heater that forms the heating section of A permanent 400v 3ø 50Hz electrical supply is
the DualAir® unit has an automatic ignition burner
and may be operated as fully modulating or ON/OFF
operation.
required at the main electrical terminals. The heater
also requires suitable energy controls in accordance
The standard unit has the air flow from left to right
when viewed from the controls side.
3.8 Flue
A special order version with the opposite air flow is
available where the combustion air intake and flue
will be at the front of the unit.
Choose a location to allow for the proper alignment
of the flue. Each DualAir® unit must be fitted with an
individual and correctly sized sealed flue system
3.2 Location and Suspension
All models:
• Must be installed indoors.
• Must be installed in a level position.
• May be mounted on the floor or on a shelf of
non-combustible material. (See Page 5, Section
No other appliance may be connected to the flue.
For room-sealed installation, the air intake must be
the same size sealed system and the flue/air intake
must terminate at an approved concentric wall or
roof terminal.
3.9 Coil Condense Drain
The cooling coil must be fitted with a suitable
condense drain. The condense pipe work should be
in plastic or copper piping in accordance with the
latest revision of applicable standards and local and
national codes.
Figure 3), on the floor, or from wall brackets of
sufficient strength to support the DualAir® unit as
Section 4.2. Drop rods must be a minimum of 12
mm diameter mild steel. Six suspension points
Figure 1: Condense Drain
are located on top of the DualAir® unit.
• Must be installed in a manner which allows the
hinged door to be fully opened to provide access
to all serviceable components.
Drain to Open Funnel
100 mm min.
3.3 Minimum Required Installation Clearances
Trap must be filled with
water to be effective and
prevent air being drawn
backwards into the drip tray.
Clearances around the DualAir® unit and flue must
access for servicing, and correct operation.
Install to Suitable Drain
3.4 Clearances to Combustibles
Failure to install the condense drain correctly may
cause water carry over into the fan compartment,
which may then escape and cause property
damage.
Clearances must be as indicated on Page 4, Figure
2. If no clearances to combustibles are indicated,
then installation clearances apply.
3.5 Ventilation
It is important to ensure that there is adequate air
circulation around the DualAir® unit to supply air for
combustion, ventilation and distribution in
accordance with local and national codes.
3.6 Gas Supply
It is important that the gas supply pipe is sized
correctly to provide the inlet pressure as stated on
the heater data plate. The gas supply pipe and
electrical connections must not support any of the
heater's weight.
3
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
WARNING
Fire Hazard
Some objects will catch fire or explode when placed
close to heater.
Keep all flammable objects, liquids and vapours the
required distance away from the heater.
Failure to follow these instructions can result in death,
injury or property damage.
Figure 2: Installation Clearances and Clearances to Combustibles
Installation Clearances
Roof Terminal
Clearances to Combustibles
Alternative
Wall
Air
Intake
Flue
Terminal
15 cm
15 cm
Condense
Drain
Air Flow
60 cm
50 cm**
Install to
50 cm
suitable drain,
See Page 3,
Figure 1.
30 cm
3 m
Insulated
refrigerant pipes
to cooling coil
by customer.
2.5 - 3.5 m*
Customer’s
Suitable
Condenser
Unit
* Free blowing DualAir® units may be mounted at
a higher level if destratification fans and/or turn
down nozzles are installed.
**80 cm is necessary to
service heater.
Free blowing DualAir® units must always be installed at least 1.8 m above the floor.
Ducted installations may be floor mounted.
The flue pipe must have clearance from combustibles by 5 cm.
If installed at low levels where individuals can come in contact with hot heat exchanger components,
adequate guarding must be provided.
All distances are minimum clearance requirements for service access, air flow and safety.
4
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SECTION 4: SPECIFICATIONS
SECTION 4: SPECIFICATIONS
4.1 DAT
Side View
3010
2070
225
532
1127
Air Intake 130 mm dia
Flue 130 mm dia
896
Gas
Air Inlet Spigot
(35 mm flange)
734
671
20 mm Conduit Entry
for Electrical Connections
Connection
Coil Protection,
Frost Thermostat
& Pressure Switch
1494
1417
1239
Internal
Spigot
Height
Heater Section Alternate
Fan Compartment
Flue &
Air Intake
Position
Lockout
Electrical
Connections
(behind door)
Cooling Coil Condense Drain Filter Compartment
Reset
Air Outlet
Spigot
Red
Amber
Dirty Filter
Warning
Green
Burner
On
Lockout
(35 mm flange) Warning
Front View (Left Version)
Front View
Standard Flue &
Air Intake Position
1032
Air Intake
315
538
225
Extension
Cover for
Flue
51
890
399
Refrigerant
Pipe-work
1340
1590
1250 Internal Spigot Width
Rear View
Rear View (Left Version)
1239
Internal
Spigot
Height
5
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
4.2 General Technical Data Table
75
90
100
115
Model
Fan Data
Designed Air Flow # with Clean Filters
m3/sec
m3/sec
m3/sec
2.88
1.66
3.71
3.7
2.60
5.34
Min Air Flow at Coil
Max Air Flow at Coil
Fan Unit
457-486 Double Inlet Belt Drive
2A x 180 / 2A x 200
2A x 100 / 2A x 95
2 x A 63
2A x 180
Fan Pulley
mm PCD
mm PCD
2A x 112 / 2A x 118
2 x A 64
Motor Pulley
Vee Belts
Electrical Data - All models need 400v 50Hz 3N supply. Single phase supply output for control circuit
230v 50Hz fused at 5 Amp. All alarm and status signals 230v 50Hz. Modulation input 0-10vDC.
3.3
2.2
5.4
4.0
Total Electrical Load
Motor Size
kW
kW
A
4.45
7.5
Full Load Current
4.0 / 4.5
23.0
7.0 / 7.5
24.0
Run Current at Designed Air Flow #
Start Current
A
A
Cooling Coil - DX
Max Cooling Load Split into Two Equal
Circuits
kW
57.74
71.54
7/8 copper
Inlet Connection
Outlet Connection
Condensate Connection
Refrigerant
in
in
1 3/8 copper
1 5/8 copper
1
ISO 7-R
R407C
27
25
18.07
13
°C Dry Bulb
°C Wet Bulb
°C Dry Bulb
°C Wet Bulb
Design Temp. ON
Design Temp. OFF
19.4
14.66
13.72
12.3
Filters - All Models
All Models
Qty. 6 - Farr 30/30 grade 100 x 635 x 406
mbar
mbar
Initial Pressure Loss
Max. Recommended Pressure Loss
Physical Data
0.4
1.5
Weight
kg
612
621
638
647
NR dB(A)
SPL dB(A)
NR dB(A)
SPL dB(A)
NR dB(A)
SPL dB(A)
65
68
68
73
75
76
72
67.5
77
Noise from Cabinet at 1 m
Noise from Air Inlet at 1 m
Noise from Air Outlet at 1 m
75
81
77
Electrical load at 230v 50Hz measured by calculating from total run current of appliance.
* Do not exceed the maximum length of flue stated or heater may not operate properly.
Reduce the maximum length stated by 1 m for each 90° bend installed.
**If minimum air flow requirements are not met then temperature limit devices will shut down the heater.
6
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SECTION 4: SPECIFICATIONS
4.3 Technical Data Table - Heater Section
Appliance Category II 2H/L 3B/P
75
95
324
86
90
111
100
119
115
134
Model
Heat Input
Gross Calorific Value
Heat Input
kW
Btu/h x 1000
kW
379
100
406
107
457
121
Net Calorific Value
Btu/h x 1000
kW
293
78
341
91
365
98
413
111
Approximate
Max Heat Output
Btu/h x 1000
kW
266
66.5
311
77.7
334
83.3
379
93.8
Min Heat Input - Low Fire
Gross Calorific Value
Min Heat Input - Low Fire
Net Calorific Value
Btu/h x 1000
kW
227
60.2
265
70
284
74.9
320
84.7
Btu/h x 1000
kW
205
54.6
186
239
63.7
217
256
68.6
234
289
77.7
265
Min Heat Output - Low Fire
Btu/h x 1000
*Combination Fan/Limit Thermostat Settings
Set Point 1 Fan OFF Temp.
°C
Set Point 2 Fan ON Temp.
°C
30
75
50
85
45
70
45
75
Set Point 3 Limit Temp.
Secondary Limit Thermostat
°C
°C
Natural Gas (G20) Data - Inlet Pressure 20 mbar Min 17 mbar Max 25 mbar
6.6
9.0
319
6.0
10.5
371
2.9
6.2
11.3
398
3.0
6.3
12.8
451
3.1
Max Burner Pressure
mbar
m3/h
ft3/h
Max Gas Flow Rate
3.23
6.30
222.5
Min Burner Pressure - Low Fire
Min Gas Flow Rate
mbar
m3/h
7.4
7.9
9.0
ft3/h
259.6
279.3
316.4
Natural Gas (G25) Data - Inlet Pressure 25 mbar Min 20 mbar Max 30 mbar
10.0
9.49
9.3
11.06
9.2
11.86
10.2
13.43
Max Burner Pressure
mbar
m3/h
ft3/h
Max Gas Flow Rate
335.1
4.9
391
4.6
419
4.5
474
5.0
Min Burner Pressure - Low Fire
Min Gas Flow Rate
mbar
m3/h
ft3/h
6.64
234.6
7.74
273.4
8.30
293.2
9.40
332.0
LPG Gas Propane (G31) Data - Inlet Pressure 37 mbar (Alternative where permitted 50 mbar) Minimum
25 mbar Maximum 57.5 mbar
25.6
3.51
6.5
12.8
12.5
27.3
4.09
7.58
14.9
13.4
25.3
4.39
8.13
16.0
12.4
25.9
4.97
9.21
18.1
12.7
Max Burner Pressure
mbar
m3/h
kg/h
Max Gas Flow Rate
liquid l/h
Min Burner Pressure - Low Fire
Min Gas Flow Rate
mbar
m3/h
kg/h
2.46
4.55
8.96
2.86
5.31
10.43
3.07
5.69
11.20
3.48
6.45
12.67
liquid l/h
LPG Butane (G30) Data - Inlet Pressure 29 mbar Min 20 mbar Max 35 mbar
18.3
2.65
6.5
11.3
9.0
19.4
3.09
7.55
13.2
9.5
18.3
3.32
8.09
14.1
9.0
18.7
3.75
9.17
16.0
9.2
Max Burner Pressure
mbar
m3/h
kg/h
Max Gas Flow Rate
liquid l/h
Min Burner Pressure - Low Fire
Min Gas Flow Rate
mbar
m3/h
kg/h
1.86
4.53
7.91
2.16
5.29
9.24
2.32
5.66
9.87
2.63
6.42
11.20
liquid l/h
Gas rates corrected to standard conditions 1013.25 mbar 15°C.
7
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
4.4 DualAir® Performance Data - Graph of Air Flows v Static Pressure
4.4.1 DAT75 and 90 (2.2 kW or 4 kW motor)
400
350
300
250
200
150
100
50
0
3.4
2.2
2.4
2.6
2.8
3.0
3.2
Air Flow m3/sec
95 mm motor pulley x 180 mm fan pulley
100 mm motor pulley x 200 mm fan pulley
4.4.2 DAT100 and 115 (4 kW motor)
400
350
300
250
200
150
100
50
0
4.0
2.8
3.0
3.2
3.4
3.6
3.8
Air Flow m3/sec
118 mm Pulley
112 mm Pulley
8
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SECTION 5: HEATER INSTALLATION
SECTION 5: HEATER INSTALLATION
5.1 General
DualAir® units are designed for installation above
2.5 m. When connected to duct delivery systems
any suitable location will be acceptable.
For floor mounting, the DualAir® unit may stand
directly on its base.
5.3 Shelf Mounting and Suspension
WARNING
Crush Hazard
Use 12 mm steel drop rod
minimum.
Failure of the supports can
result in death, injury
or property damage.
5.2 Handling
All DualAir® units have steel channel sections at the
base to be used to support the equipment. Three
steel sections are also provided across the top of the
unit for support. The DualAir® unit may be
suspended from these top sections.
The DualAir® unit is heavy and proper handling
equipment must be used by trained engineers.
Figure 3: Suspension Methods
12 mm
Steel
Drop Rod
Nut
Washers
Nut
Locknut
Rolled Steel
Channel
Base
Floor
9
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 6: FLUE INSTALLATION
6.1 Flue Installation
Figure 4: Flue and Roof Detail
WARNING
Flue
Terminal
Fire Hazard
Masterflash
soaker flashing
or Rain Collar.
Some objects will catch fire or explode when placed
close to the heater section.
Keep all flammable objects, liquids and vapours the
required distance away from the heater section.
Failure to follow these instructions can result in death,
injury or property damage.
Roof
The flue must terminate outside of the building.
Flues and air intakes must be fully sealed and
correctly sized for the model. Flues should be
Page 12, Figure 8. The joints between the flue
terminal and the roof or wall must be sealed. If the
flue passes through a wall or ceiling of combustible
material, it must be enclosed by a sleeve of non-
combustible material and be separated from the
sleeve by at least a 25 mm air gap.
Metal Sleeve
Flue
25mm Air Gap to
Combustible Material
6.4 Converting from Top to Side Terminations for
Flue and Air Intake
1. Remove the control section lower door and
Figure 6 for details.
Flues and air intakes must be adequately
supported so that the DualAir® unit does not
bear the weight of the pipes.
6.4.1 Flue Conversion
1. Remove the inner and outer flue spigots from
the top. Retain the spigot and internal seal.
6.2 Type C12, C32 & C62 Appliance
Room Sealed.
place.
The heaters are designed to be installed as room
sealed appliances. The flue and air intake are run as
separate pipes to the concentric wall or roof
3. Fit 90° bend directly into spigot "A" pointing
forwards.
4. Cut a 90 mm length from the 360 mm flue that
was removed.
6.3 Type B22 Appliance
The flue must terminate outside the building and be
fitted with a low resistance terminal.
5. Attach this piece to the 90° bend, then attach
the inner spigot that was removed.
6.4.2 Air Intake Conversion
1. Remove the flexible hose from the air intake
spigot.
6.3.1 Air Intake Terminal Cover
For Type B22 appliance installations, an air intake
terminal cover is an available option. The cover is
scored flat sheet metal that must be bent into shape.
See Page 12, Figure 7. Remove and retain the
screws for the air inlet spigot. Use these screws to
attach the cover in position over the spigot.
2. Remove the spigot from the top.
3. Move the blanking plate from the upper panel
(previously removed) to the top to cover the
original flue and air intake holes.
4. Refit the upper panel feeding the air intake flex-
ible hose through the upper hole and aligning
the flue with the lower hole.
10
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SECTION 6: FLUE INSTALLATION
5. Refit the air intake spigot to the flexible hose re-
using the hose clamp and to the upper panel
using the original screws.
6. Align the flues’ inner and outer spigots and
attach through the holes in the upper panel re-
using the original screws.
7. Refit the lower door.
Figure 5: Control Section & Upper Panel
Air Intake Spigot
Inner and Outer
Flue Spigots
Hose Clamp
360 mm Length
of 130 mm dia Flue
Flexible Hose
Upper Panel
Blanking Plate
Lower Door
Control Section
Figure 6: Alternate
Flexible Hose
Upper Panel
Hose Clamp
90° Bend
Spigot "A"
90mm Flue
Inner Spigot
Outer Spigots
11
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
Figure 7: Vertical and Horizontal Flue Termination - Type B22 Appliance
Roof Terminal
Masterflash
Metal Sleeve
(25 mm air gap to
combustible material)
Fold leg
down
Fold foot
out
Flue
Air Intake
Terminal Cover
Figure 8: Vertical and Horizontal Flue Termination - Type C12 C32 & C62 Appliances
Roof Terminal
Masterflash
Manifold
Air Intake
Flue
12
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SECTION 7: AIR SUPPLY
SECTION 7: AIR SUPPLY
7.1 Room Sealed Installation
When installed as a room sealed heater, the air for
7.3 Building Ventilation
Where ventilation is required, air must be taken from
combustion is drawn in from outside the building. It an outside point where it is not likely to be
is important to ensure that there is adequate
ventilation to provide air for the distribution fan/s.
contaminated or obstructed.
Where natural ventilation is used, suitable ventilation
with outside air at low level must be provided in
codes.
Where mechanical ventilation is used, extract rate
must be 5% - 10% less than the inlet rate. The
mechanical ventilation must be interlocked with the
burner on the heater.
7.2 Open Flued Installation
Ensure adequate air supply at all times for both
combustion and heating requirements in
accordance with local and national codes. The air
supply to the heater must be fitted with a low
resistance terminal to prevent the ingress of debris.
7.4 Isolated Equipment Rooms
7.2.1 Heaters Installed Within the Heated Space
Ventilation must prevent the isolated equipment
room temperature from exceeding 32°C as well as
prevent any negative air pressure within the room.
See Page 13, Figure 9. Any isolated equipment
room containing air heaters will require permanent
air vents direct to outside air in compliance with local
codes.
Where natural ventilation is used, suitable
permanent openings at low and high level,
communicating directly with the outside air, must be
provided.
Where the volume of the heated space is greater
than 4.7 m3 per kilowatt of total rated heat input and
the air change rate is at least 0.5/h, additional high
and low level ventilation will not be required.
For a building having an air change rate less than
0.5/h, ventilation will be necessary in accordance
with local and national codes. Ventilation direct to
outside must be provided as follows:
• Heaters above 70 kW heat input = 350 cm2 +
2.5 cm2 per kW of rated heat input above 70 kW
Where mechanical ventilation is used, extract rate
must be 5% - 10% less than the inlet rate. The
mechanical ventilation must be interlocked with the
burner on the heater.
Figure 9: DualAir® Units Installed in Isolated Equipment Rooms
High level
ventilation
Manifold
Air Intake
Flue
Duct distribution
system or
discharge to
heated space.
Return air duct
from heated
space or fresh
air from outside
Max Temperature 32° C
Room air pressure must not be negative.
Low level
ventilation
Wall
Outside
Wall
13
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 8: OPTIONAL HEATER CONFIGURATIONS
8.1 Distribution Duct
DualAir® units are designed to be connected to
distribution and air inlet ducting.
It is recommended that flexible duct connectors and/
or attenuators are used to reduce duct born noises.
It is recommended that the inlet ducting is arranged
with both fresh air and recirculating air dampers to
take advantage of the "free cooling" stage provided.
Distribution ducting must be insulated to prevent
heat gain during cooling mode.
The duct must be designed as described on Page
a homogenous air flow across the whole heat
exchanger. Failure to provide a properly distributed
air flow will reduce the life of the heat exchanger.
Contact Roberts-Gordon Europe Ltd. Design
Department for recommendations regarding
duct resistance and design. Tel: +44 (0) 121 506
7700
The air flow must be in the direction as stated for the
version being installed with the heater at the
discharge end.
Figure 10: Ducting
NOTE: Duct size will be full size of inlet and outlet.
All joints between the heater and duct work should be
made as air tight as possible.
*Inlet Duct Minimum Dimension same as Outlet Duct
Minimum Dimension
Dimension
“X”
*Minimum-
Twice
Dimension
“X”
Airflow Indicator
Ducting
Flexible Flange
14
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SECTION 9: GAS PIPING
SECTION 9: GAS PIPING
9.1 Connections
Connect the heater to the gas supply ensuring that
the final connections are as follows:
• The gas supply pipe is adequately sized to carry
the total volume of gas for the complete
installation.
WARNING
• An isolating valve and union connection should
be used and fitted into the supply adjacent to the
heater.
Fire Hazard
• For suspended heaters, use an approved metal
flexible connection between the isolating valve
and the heater. To reduce pressure loss, use
one pipe size larger than the heater gas
connection.
Connect gas supply according to Figure 11.
Gas can leak if not installed properly.
Failure to follow these instructions can result in death,
injury or property damage.
It is important that the gas supply pipe and the
electrical connections do not support any of the
heater’s weight.
IMPORTANT - The complete installation must be
purged and tested for gas soundness in accordance
with local and national codes.
A gas meter is connected to the service pipe by the
gas supply company. An existing meter should be
checked, preferably by the company, to ensure that
the meter is adequate for the rate of gas supply
required.
Installation pipes must be fitted in accordance with
local and national codes. Pipe work from the meter
to the heater(s) must be of adequate size.
Figure 11: Gas Connection with Stainless Steel Flex Connector
Option A:
Stainless Steel
Flex Gas
Hold gas nipple securely
with pipe wrench when
attaching the flex gas
connector.
Connector
Do not twist flexible
gas connector.
Ensure all joints are
gas tight.
Do not bend flexible
gas connector sharply.
Option B:
Gas Isolating Valve
Medium or Heavy
Guage Tubing
Gas Connection
Drip Leg
Cap
Union
Connection
15
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 10: WIRING AND ELECTRICAL INFORMATION
10.1 Electrical Supply
All heater models need a constant 400 V 50 Hz 3 ø
supply connected to terminals L1,L2, L3, N & Earth.
Polarity "L1 & N" must be correct. The voltage
between neutral and earth should be 0 and never
exceed 15 volts.
cooling temperature control. See Page 20, Section
To operate the modulating gas burner, a further
input of 0-10 V DC is required with 0V giving
minimum fire and a 10V giving full fire, wired in
screened cable (Belden 8451 or equivalent).
All heaters and controls must be correctly earthed.
All external wiring must comply with the relevant
local codes. Wire specification H05VV-F.
External controls must have a constant 230 V 50 Hz
1 Ø supply.
10.2.1 Remote Frost Thermostat
When required, connect to terminals 2 and 3 in the
main terminal block.
Locate within the heated space adjacent to the most
vulnerable equipment that requires protection.
An isolator with a contact separation of at least
3 mm on all poles must be installed adjacent to, but
not attached to, the DualAir® unit to disconnect all
supplies to the heater and any remote control.
10.2.2 Remote Fan Controls
The fan will operate automatically.
A switch or control wired between terminals 2 & 1 in
the terminal block will allow external control of the
fan(s).
The fan may be operated continuously from an
external control, with the burner/cooling cycling on
and off.
The final connection to the heater should be made
by flexible cable or conduit to the main terminal
block in the control section using 1 mm2 cable on all
models.
All cables entering through the top of the heater
should be routed via the metal shield to prevent
inadvertent contact with the flue.
Models
.............................................Fuse Size
DAT 75 & 90..................................................... 5 A
DAT 100 & 115 ................................................10 A
WARNING
Electrical Shock Hazard
Disconnect electrical power before servicing.
Failure to follow these instructions can result in
death or electrical shock.
10.2 Remote Control
Roberts Gordon markets a dedicated DualAir®
control that will operate all the available features of
the unit.
The DualAir® unit requires a 230 V remote control to
provide a time control and multistage heating/
16
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SECTION 10: WIRING AND ELECTRICAL INFORMATION
10.3 DAT Main Circuit Board Terminal Identification
Terminal
Number
Use
Relay/Function
Operation
Input for Remote Fan Opera-
tion Output for Fan Operation
Monitor
Optional - Main Fan Runs from
External Control
1 Input or Output
External Fan Control
230 V 50 Hz supply of external
thermostat or control
2 Output
3 Input
230 V to external control
Burner On
Burner Fires.
R1 energizes with gas valve
Burner Operates.
Fan Operates via R1
Optional Remote Indication of
Burner ON.
4 Output
5 Output
7 Output
8 Input
230 V Burner ON Signal
Neutral for Signals
& External Control
Optional Remote Indication of
Burner Lockout
230 V Burner Lockout Signal
Burner Lockout Reset from N
(5)
Optional Remote Burner Lock-
out Reset (must be from N)
DualAir® units contains Coil
Frost Thermostat, Coil Pres-
sure Switch & Auxiliary Contact
on Contactor
Site Wiring to Condensers
Normally Closed Controls
Break on Fault Position
Volt Free Safety Circuits for
External Condensers
9 & 10
Burner OFF
Fan ON from R2
Dampers Output to T16
230 V 1st Stage of Cooling
(Free Cooling)
11 Input
R2 On
Burner OFF
Fan ON from R3
Dampers Output to T15
Output to Condenser 1 at T17
& 18
230 V 2nd Stage of Cooling
Cooling Coil Stage 1
R2 OFF
R3 ON
12 Input
13 Input
230 V 3rd Stage of Cooling
Cooling Coil Stage 2
All input 12 Operations
Output to Condenser 2 at T19
& 20
R3 ON
R4 ON
14 = Neutral
15 = Recirculated Air
16 = Fresh Air
230 V Output for Optional
Damper
14, 15 & 16 Output
17 & 18
From R2
R3 ON
Volt Free Control Circuit
Condenser 1
Normally Open Contact
for Condenser 1
R3 ON
R4 ON
Volt Free Control Circuit
Condenser 2
Normally Open Contact
for Condenser 2
19 & 20
230 V Output to
Remote Dirty Filter Warning
21 = L
22 = N
21 & 22 Output
23 & 24
Alternative Dirty Filter Indica-
Volt Free Output to
Remote Dirty Filter Warning
Normally Open Contact
for Dirty Filter Indication
tion for BMS or DualAir® Con-
trol
0 - 10 V DC Input for
Modulating Burner
T3 Must Be Live to Operate
Burner
0 V = Minimum Fire
10 V = Maximum Fire
25 & 26 Input
17
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
10.4 DAT Wiring Diagram
Yellow
SENSE
BLACK
IGNITION
GREEN/YELLOW
S 4563 C Honeywell
Secondary Limit
Thermostat N/C
BROWN
BLUE
RUN
GREEN/YELLOW
LOCKOUT
E
N
L
Red
PRESSURE SWITCH
RESET
PUSH
SITE
WIRING
BLACK
NO\P(3)
YELLOW
N
L
1
2
3
7
8
WHITE
C \P(1)
NC\P(2)
Blue
Brown
White
Pressure Switch
Detail
Black
Pink
NOTE:
For external fan wiring,
Grey
If any of the original wire supplied with the
heater must be replaced, it must be replaced
with wiring material having a temperature
rating of at least 105° C and 600 volts.
18
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SECTION 10: WIRING AND ELECTRICAL INFORMATION
10.5 DAT Wiring Diagram
Yellow
Site wiring connections shown
Condensor control circuit
limit devices
9
10
Aux contact
This appliance
must be Earthed
14
13
Fuse 5A
contactor
overload &
N
1
3
2
2
400 V 50 Hz
3 N Suppy
L1
L2
main
fan
4
4
6
motor
5
6
L3
R3/2
96 95 A2
A1
Remote fan controls 230 V
1
2
3
Blue
N
L
R2/2
R1/1
230 V output to controls
Heating Stage 230 V
Heater
Supply
Brown
R1 230 V
Relay
Burner
ON
Yellow
Violet
4
5
7
Heat ON 230 V
Lockout 230 V
Coil Safety
Violet
N
3
1
3
2
Remote Lockout
reset 230 V
8
White
Black
H1
H3
1
Control inputs 230 V
R3/1
2
4
1
7
1st stage cool (free cool)
11
Filter pressure Sw
10
2
R2 230 V
3
2
2nd stage cool
3rd stage cool
12
13
14
Filter
Pressure Switch
2
R3 230 V
7
R4 230 V
N
Damper supply 230 V
Recirc' air
4
R2/1
15
16
17
18
TH
Red
Red
1
Limit
Fresh air
3
11
3
Green
Heat On
Red
9
Brown-white
Red-white
cooling condenser
1st stage
R3/3
1
cooling condenser
19
20
21
22
Lock Out
Common
Neutral
R4/1
2nd stage
Blue
Dirty filter warning 230 V
Lock Out
Reset
Grey
Pink
2
7
R5 230 V
H7
H8
Blue
Brown
White
Grey
Black
Pink
Grey
19
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
10.6 DAT Site Connections at Main Circuit Board
Screened Cable
Belden 8451
(or equivalent)
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
Earthed at one end
Burner
Modulating Signal
System Ground
-
-
0 - 10 DC
+
0 V = Minimum Fire
+
Screen
Volt Free Dirty Filter Warning
N
L
Dirty Filter Warning 230 V
2nd stage
Volt Free
cooling condenser
Condenser
Control
1st stage
cooling condenser
Fresh air
Circuits
Cooling Stage 3
(2nd stage
cooling coil)
Recirc' air
N
Damper
Supply
Cooling Stage 2
(1st stage
cooling coil)
Cooling Stage 1
(free cooling when
fresh air is connected
and dampers fitted)
Remote Lockout Reset
8
7
5
4
Lockout Warning 230 V
N
Heat ON
Indication
230 V
MultiStage
Temperature
Control
(or similar)
Optional Frost Thermostat 230 V
Heating Stage
for ON/OFF and
Burner Modulation
3
2
1
Time Switch Control 230 V
Optional External Fan Control 230 V
L3
L2
L1
N
400 V 50 Hz
3 N Suppy
This appliance
MUST be
Earthed
Volt Free Condenser
10
9
Control
Circuit Safety Devices
20
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SECTION 11: COMMISSIONING
SECTION 11: COMMISSIONING
Gas Fired Heater
11.1.2 Electrical Checks
Installation, service, commissioning and annual
1. Check that all site wiring is connected in
accordance with the appropriate wiring dia-
inspection of the heater must be done by a
contractor qualified in the installation and service of
gas-fired heating equipment. Read this manual
carefully before installation, commissioning,
operation, or service of this equipment. All
components are accessed via the hinged door.
Opening the door exposes live electrical
connections and hot components.
2. Check the correct fuse size is fitted;
11.2 Gas Supply
All aspects of the gas installation including the gas
meter must be inspected, tested for soundness and
purged in accordance with local and national codes.
Cooling Coils/Condensers
Installation, service, commissioning and annual
inspection of the cooling equipment must be done
by a contractor qualified in the installation and
service of refrigeration equipment. Read condenser
manufacturer’s manual carefully before installation,
commissioning, operation, or service of this
equipment.
11.3 Mechanical Checks
1. Check that the fan is free to run and that the fan
rotates in the correct direction. To reverse rota-
tion, transpose two of the incoming phase con-
nections.
2. Check that the flue and air intake are installed
in accordance with these instructions and local
regulations.
WARNING
3. Check that the settings of the Combination Fan/
NOTE: The second limit thermostat is preset and
sealed at the factory and is not adjustable.
Electrical Shock Hazard
Use extreme caution while commissioning.
11.4 Begin Commissioning
11.4.1 Before Operating the Heater
Failure to follow these instructions can result in
death or electrical shock.
To ensure that all the controls are in safe working
order, operate the heater for the first time with the
isolating gas valve turned off.
11.1 Pre-Commission Checks
All pre-commission checks must be carried out
before lighting the heater.
1. Turn off the isolating gas valve
Ensure that the heater and all controls are suitable
for the gas, pressure and electrical supply to which
they are to be connected.
2. Using the installed external control, turn on the
burner. The automatic sequence will now begin
There will be no ignition of the burner and lockout
will occur, proving the controls are operating
correctly.
11.1.1 Louvres
Where fitted, the air delivery louvres need to be set
during commissioning to give the required air
distribution.
WARNING
Cut Hazard
Turn off gas and electrical supply before maintenance.
Fan can start automatically at any time.
Failure to follow these instructions can result in severe
injury or product damage.
21
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
Figure 12: Automatic Burner Control Box Sequence
Burner sequence for Honeywell S4563 or S4565C
START
CLOSE
DOWN
RUN
Supply 230 V
Flue Fan
30 Sec. Purge*
NO
Pressure Switch
C
P
NC
ts**
Ignition Spark
Start Gas Valve
Flame Signal
Required Incoming Signals
Signals Output By Control
*Purge time begins at pressure switch change over.
**ts=Safety time (S4563C=3 seconds [alternate 5 seconds]; S4565C=5 seconds)
If at any stage the flame fails, the control will go to "lockout". The red light will illuminate and the
control must be manually reset before further start attempt.
Figure 13: Modureg Gas Valve
Moving Shaft
Max Pressure Adjustment
Min Pressure Adjustment
Plug for
Main Gas Valve
Modureg Modulating Regulator
6.3mm AMP
Terminals for
Modulation
Plug for
Main Gas Valve
Inlet Pressure
Honeywell Gas Valve
Gas Inlet
Gas Outlet
Outlet Pressure
22
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SECTION 11: COMMISSIONING
11.4.2 Commissioning the Gas Valves
sure must be corrected before completing the
commission.
All DualAir® units are fitted with fully modulating
burner operation. The Honeywell automatic gas
valves are fitted with the Honeywell Modureg
modulating regulator.
2. Release the moving shaft and observe that the
burner pressure returns to the minimum setting.
3. Turn off the external controls and reconnect the
electrical leads to the Modureg regulator.
The Modureg device provides the adjustments for
maximum and minimum firing and is set using the
The external control will operate the burner between
these two limits depending on heat demand.
4. Turn on the external controls and allow the
burner to fire once again observing the burner
pressure.
5. Using the temperature set point device of the
installed control system, set for maximum
burner firing and observe that the burner pres-
sure slowly rises to the maximum as set.
The minimum set point must not be set lower
than the minimum burner pressure stated on
11.4.3 Commissioning the Gas Valve
There are two stages to commissioning the
modulation equipment.
6. Reset the temperature set point by small steps
until the burner pressure slowly drops to the
minimum pressure set. Repeat Step 5 and
observe that the maximum set point is again
achieved.
The minimum pressure setting must be adjusted
first, any adjustment of the minimum pressure
setting will affect the maximum pressure setting.
Check Gas Rate
1. After burner pressure adjustment, allow the
heater to operate for at least 15 minutes and
then re-check settings.
For ON/OFF non-modulating operation set the
minimum firing rate to be the maximum burner
pressure as on Page 6, Section 4.2
2. Remove the manometer and refit all covers to
the valve and tighten the screw of the outlet
pressure tap.
11.4.3.1 Set Minimum Pressure
1. Disconnect the leads from the coil of the
Modureg regulator.
3. Check gas flow rate at gas meter.
2. Connect a suitable manometer to the burner
pressure test point of the main gas valve.
11.5 Combustion Testing
The only adjustment to alter combustion
performance is burner pressure. Combustion quality
must be tested to prove correct heater operation.
Incorrect results will indicate faults with the
installation or appliance.
3. Turn on any external controls and allow the
burner to fire for at least five minutes.
4. Remove cap and using a suitable 9mm span-
ner adjust the burner minimum set pressure to
Combustion testing must be carried out at full fire
with all covers in place. The flue gas is sampled in
the flue, within 1 meter of the heater. The values of
CO2 should be between 6.5% to 8.0% for natural
gas and 7.0% to 9.1% for LPG dependant upon
model.
The CO will be up to 80 ppm (0.008%) dry, air free
dependant upon model. Temperature rise of the flue
gases above ambient should be approximately
160°C to 180° C. Seal test hole in flue after testing.
11.4.3.2 Set Maximum Pressure
(Not Required for ON/OFF burners)
1. Press in the moving shaft of the Modureg valve
and hold in this position while adjusting the
burner maximum pressure to the value shown
NOTE: If the correct burner pressure cannot be
reached, then check the inlet pressure to the
valve, with the burner firing. See Page 6, Sec-
tion 4.2 for inlet pressure requirements.
Following the above operate the heater for 30
minutes at the minimum firing rate. Following this
time the temperature of the products of combustion
in the flue should be measured. If the flue products
temperature is below 80° C then the minimum firing
rate should be increased. Continuous operation of
Do not continue to adjust the regulator if the
pressure is not changing.
If the inlet pressure is too low to allow a correct the burner with flue gas temperature of below 80° C
will cause condensation to form in the heat
burner pressure setting, then the gas inlet pres-
exchanger and flue system. This will cause nuisance
23
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
water collection and a shortened heat exchanger
life.
Pressure Switch
The pressure switch is factory pre-set for each
model and is not adjustable.
11.6 Turning Off the DualAir® Unit
Set the external controls to the off position and the
main burner will stop.
The fans will run until they are stopped automatically
by the fan thermostat.
Do not use electrical isolator for control of
heater. Electrical isolator will switch off the fan.
Heat exchanger could be damaged. Warranty will
not cover damage to the heat exchanger if
operated improperly.
11.7 External Controls
External controls may include time switch, room
thermostat and frost thermostat. Operate each
control to ensure that they function correctly. Set the
time switch (if fitted) and room thermostat to the
users’ requirements. Operate the external controls
and ensure that the installed cooling stages operate
11.8 Complete the Commissioning
Ensure that all covers are fitted correctly and all test
points are properly sealed.
11.9 Instruction to the User
Explain the controls of the DualAir® unit to the user
including how to turn it on and off, using the controls
fitted on site.
Give this manual to the user.
Ensure that the user is shown and understands the
importance of maintaining clearances to
combustibles and the user instructions on Page 25,
warnings defined in this manual.
24
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SECTION 12: USER INSTRUCTIONS
SECTION 12: USER INSTRUCTIONS
12.1 User Instructions
12.3 Common User Controls
12.3.1 Combination Fan/Limit Thermostat
The Combination Fan/Limit Thermostat is located
inside the access door at the top of the heater. See
The DualAir® units are fully automatic and operate
from the external controls fitted on site.
The only user controls at the heater are the:
Burner lockout reset button:
This control ensures the heater does not blow cold
air in the normal heating cycle and protects the heat
exchanger against overheating.
...................................See Page 26, Section 12.3.3
Limit thermostat reset:
.................................... See Page 25, Section 12.3.1
Second limit thermostat reset button:
...................................See Page 25, Section 12.3.2
Figure 15: Fan/Limit Thermostat
If the air flow is reduced due to power failure the
limit thermostat will cause the burner to lockout.
WARNING
Red limit reset button
(Press to reset)
White fan button
Electrical Shock Hazard
Pull out for normal operation.
Press in for constant fan.
Disconnect electrical power before servicing.
The combination fan/limit thermostat is preset
during commissioning.
Failure to follow these instructions can result in
death or electrical shock.
NOTE: To reset, the heat exchanger must be cool.
12.2 Heater Operation
Description
Part Number
When the heater has been switched on by the
remote controls installed, the main burner will
automatically turn on.
The burner control box will control the ignition of the
flame.
All heaters require a constant gas and electricity
supply which must not be interrupted during the
normal operation of this heater.
Combination Fan/Limit Thermostat
K017A
12.3.2 Secondary Limit Thermostat
Press to reset
12.2.1 Warning Lights
These are hand reset devices to give further
protection against fan failure.
NOTE: To reset, the heat exchanger must be cool.
The DualAir® unit has three warning lights;
GREEN = Heater ON, burner attempting to fire
RED = Burner LOCKOUT, see Section 12.3.3.
AMBER = Dirty Filter, replace filter, air flow is
dropping to an unacceptably low value.
Description
Part Number
Secondary Limit Thermostat
90412100
Figure 14: Heater Operating Sequence
ON
CLOSE
DOWN
THERMOSTAT
CALL FOR
HEAT
ON
BURNER
RUN
ON
RUN ON
FAN
25
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
Do not operate the DualAir® unit without filters
as the cooling coil may become blocked and
impossible to clean.
WARNING
12.5 Heating Section Lighting Instructions
12.5.1 To Turn On Heater
1. Ensure that the electrical and gas supplies to
the heater are on. Check that the on site con-
trols are “ON”.
Explosion Hazard
NOTE: The thermostat setting must be above the
ambient temperature for the heater to operate.
If control locks out, do not make more than 3
attempts to restart the heater.
2. The green light will be on and the automatic fir-
ing sequence will begin as described on Page
22, Figure 12. The heater will now operate
automatically under the control of the on site
controls. Following long shut down periods, the
control may go to lockout. See Page 26, Sec-
tion 12.3.3.
Dangerous gas mixtures can build up.
The fault must be traced and repaired by a
registered installer or service engineer.
Failure to follow these instructions can result in
death, injury or property damage.
12.3.3 Burner Lockout Reset Button
12.5.2 To Turn the Heater Off
The red warning light will illuminate when the control
has gone to lockout. This may be caused by flame
failure. Press the reset button,(See Page 5, Section
4.1), or the remote reset if installed on site.
Set the installed remote controls to “OFF”.
The burner will turn off immediately.
The fan will continue to run for a few minutes.
To restart turn the control used above to “ON”.
12.4 Cooling Section Operation
The temperature control will bring on the fan to
12.6 Simple Fault Finding
Possible reasons for the heater not operating are:
1. Gas supply not turned ON.
operate the DualAir® unit in cooling mode dependent
on the current temperature and set point.
Once the temperature rises above the set point,
there are three stages of cooling available
dependant on site installation.
2. Electricity supply not turned ON.
3. The time and/or temperature controls are not
“ON”.
Cooling Stage 1 (optional free cooling):
The fan runs and change over dampers (if fitted)
allow fresh air to be drawn from outside.
4. One or both of the limit thermostats may have
operated. This may be caused by an interrup-
tion of the electrical supply or failure of the
distribution fan.
If the limit thermostats persistently operate, there is
a fault which must be investigated by a contractor
qualified in the installation and service of gas-fired
heating equipment.
If the temperature continues to rise then
Cooling Stage 2 operates: The fan runs, the
dampers (if fitted) return to recirculating air and the
first condenser operates to provide cooling at half
load.
Should the temperature continue to rise,
Cooling Stage 3 operates: The fan runs, the
dampers (if fitted) remain in recirculating air and the
second condenser operates to provide cooling at full
load.
12.6.1 Simple Fault Finding (burner faults)
If the burner fails to ignite for any reason, it will go to
lockout. This will be indicated by the red light on the
heater or at the remote indicator (if fitted).
12.4.1 Filters
Air cleaning filters are fitted to the DualAir® unit to
protect the cooling coil and provide improved
environmental conditions.
1. Press in and release the lockout reset button. If
a remote reset is not fitted a reset button is on
the side panel of the heater. See Page 5, Sec-
The filters will require to be replaced at least three
times per year and in dirty environments cleaning of
the filters may be required at more frequent
intervals.
When the filters are dirty the warning light will show
see Page 25, Section 12.2.1. The filters must be
cleaned or replaced immediately.
26
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SECTION 12: USER INSTRUCTIONS
FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. DO NOT try to light any appliance.
3. DO NOT use electrical switches.
4. DO NOT use any telephone in
your building.
5. Leave the building.
6. Immediately call your local gas
supplier after leaving the building.
Follow the gas supplier’s
instructions.
7. If you cannot reach your gas
supplier, call the Fire Department.
WARNING
Fire Hazard
Do not store or use petrol or other
flammable vapours and liquids in the
vicinity of this or any other appliance.
Some objects will catch fire or explode
when placed close to heater.
Failure to follow these instructions can
result in death, injury or property
damage.
27
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 13: SERVICING
13.1 Servicing Instructions
to ensure that adequate air flow.
The cooling equipment will automatically turn off
should the air flow drop to a preset low value even
though the fan will still run. The maximum resistance
across a dirty filter should be no more than 150 Pa
(1.5 mbar) and the dirty filter warning light will be on.
A resistance higher than this indicates that the filters
must be replaced.
After commissioning, the DualAir® unit will require
maintenance to be carried out annually. If the
DualAir® unit is used in a dirty or dusty area, more
frequent maintenance may be necessary.
Installation, service and annual inspection of heater
must be done by a contractor qualified in the
installation and service of gas-fired heating
equipment.
13.2 Burner Maintenance
1. Open the hinged door and remove the burner
2. Clean any deposits from the main burner which
may have formed in the injectors or venturi of
WARNING
3. Remove the ignition electrode and flame probe.
Check condition of ignition electrode and flame
probe. Clean off any deposits which may have
been formed, check condition of ceramic
insulators. Replace as necessary.
Cut Hazard
13.3 Fan/Motor Assembly Maintenance
Turn off gas and electrical supply before maintenance.
Fan can start automatically at any time.
The main fan bearings are permanently sealed and
do not need lubrication. Before cleaning, turn off gas
and electrical supply. Remove the fan compartment
covers and use a small brush or duster to clean the
fan blades from each side. Replace fan(s) when
done.
Failure to follow these instructions can result in severe
injury or product damage.
NOTE 1: After any maintenance or repair work
always test fire the heater in accordance with the
systems are in working order before leaving the
heater to operate. Minor faults may be traced by
using the troubleshooting charts on Page 31,
Figure 16: Belt Tension
8 mm to 10 mm
Fan
Pulley
Motor
Pulley
NOTE 2: Check all gas pipes and pipe joints to
ensure there are no cracks or gas leaks.
Check the condition and tension of the drive belts.
The condition is best inspected with the belts
removed. Check for chaffing or lateral cracks.
Replace belts as a matched pair as necessary.
Do not over-tighten belts, as this may cause bearing
damage.
NOTE 3: Inspect all suspended components and
hardware. Insure that they are in good condition,
properly tightened, and corrosion free.
13.1.1 Cooling Equipment
The cooling coil does not require maintenance
except that during filter replacement it is
recommended to clean the surface of the coil with a
soft brush and vacuum cleaner. Carry out any
maintenance recommended by the condenser
manufacturer.
13.4 Heat Exchanger Maintenance
The heat exchanger will remain clean unless a
problem has developed with combustion. Inspect the
heat exchanger. Look for signs of overheating at the
front tubes which may indicate burner over firing or
persistently low air flows.
13.1.2 Filters
The air filters should be inspected regularly to
ensure that no excessive build up of deposit is being
experienced. If heavy deposit is being formed, then
the filters may be cleaned using a vacuum cleaner.
Filters should be replaced at least every four months
28
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SECTION 13: SERVICING
13.5 Gas Control Valve Maintenance
No regular maintenance is required on these
Do not repair or disassemble on site.
Replace faulty gas valves with genuine
ROBERTS GORDON® replacement parts.
13.6 Flue Fan
The flue fan should not require maintenance.
However, If the air pressure switch is causing burner
lockout then remove the flue fan from the vent box.
See Page 39, Section 16.4. Ensure that the fan is
free to run and that the fan wheel is clean.
29
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 14: CONVERSION BETWEEN GASES
14.1 General
Conversion between gasses will require a change of
burner injectors and the gas valve re-commissioning
to the new conditions.
14.2 Burner Conversion
Conversion of the burner assembly from one gas to
the other is the same for all types of heaters.
1. Remove the burner compartment cover as
2. Remove the connection between the gas valve
outlet and the manifold. See Page 36, Section
16.1 for gas valve removal.
3. Remove the manifold from the burner assembly
by removing the screws at the top and bottom.
See Page 37, Section 16.2.1.
4. Remove the main burner injectors.
5. Replace with the injectors for the new gas
ensuring a gas tight seal.
6. Refit all components in reverse order.
14.3 Gas Valves
All gas valves used on the DualAir® units have
pressure regulators that may be set to operate on
natural gas or LPG.
Conversion is carried out by re-setting the burner
pressure to the value in the data table during
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.
30
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SECTION 15: TROUBLESHOOTING
SECTION 15: TROUBLESHOOTING
15.1 General
WARNING
Explosion Hazard
Installation must be done by a registered installer/
contractor qualified in the installation and service of
gas-fired heating equipment or your gas supplier.
Failure to follow these instructions can result in death,
injury or property damage.
Start
Are gas & electrical
supplies on?
No
Turn on supplies.
Yes
Is Red lockout
Yes
No
Use 15.2 to test burner.
warning light on?
No
Press the white button on
the combination fan/limit
thermostat. Does the
fan run now?
Use 15.5 to test fan.
Does the fan run?
No
Yes
See sections 5.3 & 11.3 to
check combination
fan/limit thermostat settings.
Does the fan run?
Replace combination
fan/limit thermostat.
No
No
Yes
No
Yes
With external controls on,
does the burner continue
through the heating cycle?
Is combination fan/limit
thermostat set correctly?
See sections 5.3 &11.3.
Adjust or replace
as necessary.
Has burner “Locked Out”?
No
Yes
Use 15.2 to test burner.
Yes
If problems persist, contact
ROBERTS GORDON® at
Tel: +44(0) 190 249 8733
Heater Operating
TROUBLESHOOT ENDS.
No
For your safety and optimum heater performance use only ROBERTS GORDON® replacement parts.
31
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
15.2 Troubleshooting For Automatic Ignition Burner Systems
There are two burner controls used. Honeywell S4563C and
S4565C. They both have similar operating sequences. To
measure flame current, connect a 0 - 50 μA DC meter in
series with the flame probe. If the meter reads negative
values, then reverse the test leads.
WARNING
Electrical Shock Hazard
Do not touch ignition components.
Start
Voltage from ignition components is high.
Are gas & electrical
supplies on?
Turn on supplies.
No
Failure to follow these instructions can
result in death or electrical shock.
Yes
Have limit thermostats
operated or light faulty?
Reset or replace as
necessary.
Is the green light on?
Are external controls on?
Yes
No
Yes
No
Yes
Press in lockout reset button
on rear of heater or remote
reset button if fitted.
Is red lockout light on?
No
Is 230v supply at fan
connections?
Does flue fan run?
Yes
Flue fan faulty replace
No
Burner control faulty or plug
in connections faulty. Repair
or replace as necessary
Yes
Check for too much flue/air inlet
duct. Check for blockage in
combustion air circuit.
Check for faulty air pressure
switch. See section 16.5.
Does air pressure switch
change over?
No
Yes
Is HT lead okay and
Ignition control faulty
replace.
Wait 30 - 40 seconds.
connected?
No
No
Yes
Yes
Is ignition spark operating?
Is spark electrode okay?
See Section 15.6.
Yes
Is the gas valve operating?
To test valve,
Replace valve.
Does the flame light?
No
No
see Section 15.4.
Yes
Is the flame current at
least 1 µAmp DC when
the flame lights?
Trace fault in supervision
system. See Section 16.3.
Is red lockout light on?
No
For your safety and optimum heater performance
use only ROBERTS GORDON® replacement parts.
Conduct Commissioning procedure as shown
If problems persist, contact
ROBERTS GORDON® at
Tel: +44(0) 190 249 8733
Heater Operating
TROUBLESHOOT ENDS.
No
32
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SECTION 15: TROUBLESHOOTING
15.3 Troubleshooting for Flame Supervision System
START
Connect a DC ammeter in
series with the flame probe.
Is the green light on and
at least 1 µA DC fame
current?
Use section 15.1 to
No
Yes
Yes
trace the fault.
Yes
Is the connecting lead
damaged? Is the flame probe
damaged or touching earthed
components?
Is there a current flowing in the
flame probe circuit with no
flame present?
Repair or replace as
Yes
Yes
necessary.
No
Is inlet burner gas pressure
correct? Is live and neutral
polarity correct? Is
Does “lockout” occur when
there is a flame present?
Control box faulty.
Replace with correct type.
flame probe circuit correct?
No
Repair or replace as
necessary.
No
If problems persist, contact
ROBERTS GORDON® at
Tel: +44(0) 190 249 8733
Heater Operating
TROUBLESHOOT ENDS.
No
NOTE: Minimum flame probe current 1 μA DC. Typical flame probe current 3-5 μA DC.
33
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
15.4 Troubleshooting for Solenoid Valves
START
Is 230v at the valve
terminals at the
appropriate time.
No
No
Fault elsewhere
Fault elsewhere
Yes
Is gas pressure at inlet of the
valve correct for gas type?
Note pressure found.
Yes
Valve faulty.
Replace with one of
correct type.
Does gas pressure at outlet
of the valve rise when
valve turns on?
No
No
No
Yes
Does gas pressure at
outlet of valve return to zero or
lower when valve turns off?
Valve faulty.
Replace with one of
correct type.
Yes
If problems persist, contact
ROBERTS GORDON® at
Tel: +44(0) 190 249 8733
Valve Operating
TROUBLESHOOT ENDS.
15.5 Troubleshooting for Main Fan
START
Is Power supply 400 V
between any two phases or
230 V between any Phase and
N at the main terminal block?
Does fan run
automatically?
Fault elsewhere.
Check wiring.
No
No
Yes
Is there 230v between
terminals 1 and N of the
main terminal block?
Does fan run when the white
button of combination fan/limit
thermostat is pushed in?
Combination fan/limit
thermostat faulty.
Replace with correct type.
No
No
Yes
Yes
Yes
Use Section 5.3 & 11.3 to check
combination fan/limit
thermostat settings. Reset or
replace as necessary.
Fan motor or contactor faulty.
Replace with correct type.
Use Section 15.6 to
trace fault.
Does fan turn on and
off while burner is firing
continously?
Yes
No
If problems persist, contact
ROBERTS GORDON® at
Tel: +44(0) 190 249 8733
Fan Operating
TROUBLESHOOT ENDS.
No
For your safety and optimum heater performance use only ROBERTS GORDON® replacement parts.
34
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SECTION 15: TROUBLESHOOTING
15.6 Troubleshooting for Fan Contactor
START
Does main fan run
Wiring faulty or faulty
combination thermostat.
Investigate.
Is power supply 400v at
three phase and N at the
main terminal?
automatically
Fault elsewhere
No
No
in heating mode?
No
Yes
Does fan run when white
button of combination
thermostat is pushed in?
Is there 230v between
terminals 96 and A1 on
the contactor?
Has fuse 1 on the
printed circuit board
blown?
Is there 230v at contactor
coil terminal A1 and A2?
Press in overload reset
button and retest.
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Overload operated. Check for
three phases at mains
terminals, loose electrical
terminals and motor overload.
Replace
combination thermostat.
Contactor faulty.
Replace.
Replace fuse and
investigate.
Overload Faulty
Replace.
Yes
Are fan belts
loose or broken?
Transpose two incoming
phase connections.
Does fan motor run with
little or no air flow?
Is fan/motor rotation
No
No
Yes
correct?
Yes
Replace or tighten belts.
No
Check filters and
ducting for blockage.
Yes
Relay R1 faulty.
Replace.
Does fan run
No
No
as burner fires?
Yes
Does main fan run
automatically
in cooling mode?
Does fan run at cooling
stage 1 (T11 live)?
Relay R2 faulty.
Replace.
No
Yes
Does fan run at cooling
stage 2 (T12 live)?
Relay R3 faulty.
Replace.
No
Yes
Fan Operating
TROUBLESHOOT ENDS.
No
If problems persist, contact
ROBERTS GORDON® at
Tel: +44(0) 190 249 8733
For your safety and optimum heater performance use only ROBERTS GORDON® replacement parts.
35
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
SECTION 16: REMOVAL AND REPLACEMENT PARTS
Figure 17: Standard Regulator Removal
See warnings and notes on Page 28, Section 13
before removing or replacing parts.
Sealing
Washer
Burner Components
All serviceable burner parts are accessed by the
door on the side of the heater.
16.1 Gas Valve
The VR4605 gas valve is fitted with the V7335A
Modureg regulator (P/N L512) supplied as a
separate component.
Remove Standard
Regulator
Fit the Modureg ensuring that the rubber seal is in
place and the two screws are tight. See Page 36,
When replacing the gas valve, the Modureg will
need to be fitted on site. To fit the Modureg, remove
the standard regulator by removing the two screws
retaining the rubber sealing washer. See Page 36,
16.1.1 Gas Valve Replacement - (all models)
Rubber
Seal
Step 1
Unscrew
gas pipe
from the
valve inlet.
Ignition
Control
Modureg Modulating
Regulator
Step 2
Unscrew valve from the
burner manifold
Description
Gas Valve VR4605
Ignition Control
Part Number
90033404
90434020
or
unscrew the screws for
the inlet and outlet flanges.
16.1.2 Gas Valve Replacement continued- (all models)
Replace in reverse order. Verify that the gas flow
direction of the valve is correct. Re-use the "O" ring
seal in the outlet flange where fitted. Check that all
the joints are leak free. Reset gas valve.
IT IS IMPORTANT THAT ONLY THE CORRECT
GAS VALVES SPECIFIED FOR EACH MODEL
TYPE ARE USED WHEN REPLACING THESE
CONTROLS.
36
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SECTION 16: REMOVAL AND REPLACEMENT PARTS
16.2 Burner Compartment
The burner compartment is a sealed
compartment. Following any work,
re-seal the compartment with the gas
pipe rubber seal fully in place and all
screws fitted and tight.
Burner
compartment
cover
Flame probe
Viewing port
for flame probe
Remove flexible
air duct from spigot
Ignition electrode
Viewing port
for ignition electrode
Remove
access plate
Rubber Seal
Remove screws and
pull off burner cover
16.2.1 Burner Injectors
Ensure gas tight fitting of injectors.
Ensure correct alignment with burners.
Ensure all pipe joints are gas tight.
Manifold
Burners
Injectors
Remove manifold
screws and pull
out manifold
Manifold
Unscrew
Injectors
Burner
screws
Marking
MODEL
75
90
100
115
Injector Quantity
12
14
15
17
Natural Gas (G20) and (G25)
mm dia
in dia
2.71
2.71
2.71
2.71
Injector
Size
0.1067
0.1067
0.1067
0.1067
Marking
RG P/N
36
36
36
36
91930036
91930036
91930036
91930036
LPG Gas Propane (G31) and LPG Gas Butane (G30)
mm dia
in dia
1.51
0.0594
53
1.51
0.0594
53
1.51
0.0594
53
1.51
0.0594
53
Injector
Size
Marking
RG P/N
91930053
91930053
91930053
91930053
37
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
16.3 Ignition Electrode and Flame Probe.
Fan/Limit Thermostat
Burners
Secondary
Limit
Thermostat
Flame
Probe
Flame
Probe
Remove all
burner compartment
screws to remove
the burner
Remove
Screw
compartment and
access the
“Front View”.
Burner Compartment
Front Views
Ignition
Electrode
Ignition
Electrode
(3 mm)
.120"
spark
gap
Burners
To replace the ignition electrode or flame probe, remove the electrical lead and screw.
Pull out from mounting. Refit in reverse ensuring that the gap to burner is as shown in the
front view of the burner compartment.
Description
Spark Electrode
Part Number
90427411
Automatic Ignition Flame Probe
Burners (all models)
90439300
92000000
38
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SECTION 16: REMOVAL AND REPLACEMENT PARTS
16.4 Flue Fan
Remove screws securing outlet
flange to the flue adapter.
Rear Panel
Flue Adapter
to Flue Fan
screws
Hole
Vent Box
Flue
Adapter
Vent Box
screws
Outlet
Gasket
Flue Fan
Disconnect
electrical connections
at plug in tabs.
Remove screws securing flue
fan mounting plate to vent box
Remove screws securing
mounting plate to fan.
Vent Box
Mounting
Plate
Refit in reverse.
Mounting Plate
to Vent Box
screws
Use new gaskets.
Ensure sealed joints.
Ensure mounting plate orifice is
clear and not obstructed.
Gasket
Gasket
Mounting Plate
to Flue Fan
screws
Air Plate
MODEL
75
90
100
115
Torin DSF
146-052
077274
AO Smith
JFIG07INS
AO Smith
JFIG07INS
AO Smith
JFIG07INS
Flue Fan
RG P/N
90710001
97.0
90710001
103.6
90710001
110.5
90710450
152.4
Air Plate
[mm dia]
[in dia]
3.82
4.08
4.35
6
RG P/N
11011134
11011133
11011132
11011131
IT IS IMPORTANT THAT ONLY THE CORRECT FLUE FAN SPECIFIED FOR EACH MODEL TYPE IS
USED WHEN REPLACING THESE ITEMS.
39
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
16.5 Heater Pressure Switch
Pull off 3 way connector. Spring open plastic clips of
mounting cradle. Replace with correct type of
pressure switch for model. The pressure switches
are colour coded for each pressure setting.
WARNING
Carry out a commission after working on or
changing a pressure switch.
Carbon Monoxide Hazard
Use correct pressure switch specified for each model.
Use of incorrect pressure switch could cause unsafe
condition.
Failure to follow these instructions can result in
death or serious injury.
Pressure Switch
RG P/N
75
90439811
grey
90
100
90439811
grey
115
90439807
brown
90439807
brown
Colour Code
40
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SECTION 16: REMOVAL AND REPLACEMENT PARTS
16.6 Cooling Coil Safety Devices
16.6.1 Cooling Coil Frost Thermostat
Coil Pressure Switch
(Normally open contact) used to prove adequate air
flow for safe operation of cooling coil.
The sensing element for this device is inserted into
the pocket of the cooling coil situated through the
access hole in the coil cover.
Filter Pressure Switch
(Normally open contact) used to give indication of
filter becoming blocked.
The frost thermostat has two settings marked as set
point with an arrow head and "diff". The control
should be set at 5° C with a 1° C differential.
To replace, remove coil compartment cover.
Disconnect wires noting their position. Remove the
flexible tubing noting the position of the tube
connection. Replace in reverse order and check
operation.
To replace, remove screw and pull off knob.
Remove cover. Disconnect wires.
Pull the sensing element out of the pocket in the coil.
Replace in reverse order.
16.6.2 Pressure Switches
The coil and dirty filter pressure switches are preset
and different. They are differential pressure switches
measuring the pressure loss across the coil or filter.
Figure 18: Cooling Coil Safety Devices.
Red
White
Coil Frost Thermostat
set at 5°C with 1°C diff.
Coil Pressure Switch
set at 0.57 mbar (.23 in wc)
Filter Pressure Switch
set at 1.17 mbar (.47 in wc)
White
Filter
Red
N.O
Connections
Negative
Pressure
Positive
Pressure
Set
Point
Description
Part Number
90439801
90439804
K018
Coil Pressure Switch
Filter Pressure Switch
Coil Frost Thermostat
41
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
16.7 Ignition Control
IT IS IMPORTANT THAT ONLY THE CORRECT
IGNITION CONTROL SPECIFIED FOR EACH
MODEL TYPE IS USED WHEN REPLACING
THESE ITEMS.
16.7.1 S4563C
This control is mounted at the electrical mounting
plate. Pull out the 3 cable connectors.
Pull out ignition cable, ignition earth and flame probe
cable noting their positions. Remove the screws.
Refit in reverse. Ensure correct location of ignition
and flame probe cables.
16.8 Fan Motor Removal
Belt Tension
Adjustment
Locknut
Jacking Screw
Position
(ensure tight)
(adjust both ends
the same to ensure
motor is parallel
to fan case)
Motor Fixing
Bolts
Taper Lock
Screws
Pivot Bolts
(ensure tight)
1. Disconnect the electrical connections at the
contactor and pull the cable back to the fan
motor.
2. Slacken the belt tensioning nuts and remove
the drive belts.
3. Unscrew the motor mounting bolt.
(motor is heavy, may need two people)
4. Remove the motor pulley by using a hexagonal
key to remove the taper lock screws. Use one
of these screws to fit into the centre jacking
screw and tighten into this position to separate
the taper lock bush and the pulley.
5. Replace in reverse order.
Use a straight edge to ensure both pulleys line
up. Ensure the pulley fixing screws are tight
and belt tension is correct (use new belts if
required). Ensure motor rotation is correct.
42
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SECTION 16: REMOVAL AND REPLACEMENT PARTS
16.8.1 Fan Removal and Replacement
Fan Plate
Fan Outlet Flange
Securing Screws
Fan Mounting
Brackets
(re-use on new fan)
Bracket Screws
(re-use on new fan)
Fan Foot
Screws
Description
Torin Fan DDC 270-270
Torin Fan DDC 241-241
Part Number
A047
A049
Mounting Rail
1. Remove motor leaving the pulley in place.
3. Fit a new thermostat ensuring that the correct
temperature setting and type are selected. See
2. Remove screws securing the fan outlet flange
to the fan panel. (captive nuts)
4. Reconnect wires and test operation.
3. Remove nuts and bolts securing the fan feet to
the mounting brackets.
4. Slide the fan out.
(fan is heavy, may need two people)
5. Remove the fan mounting brackets from the
fan. Retain components to fit to new fan.
6. Remove the fan pulley by using a hexagonal
key to remove the taper lock screws. Use one
of these screws to fit into the centre jacking
screw and tighten into this position to separate
the taper lock bush and the pulley.
7. Refit the components above to the new fan and
refit in reverse order.
8. Check belt alignment and tension.
9. Check fan rotation is correct.
16.9 Combination Fan/Limit Thermostat
16.9.1 Removal and Replacement
1. Remove wires.
2. Remove the mounting screws.
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DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
Figure 19: Combination Fan/Limit Thermostat
WARNING
Fire Hazard
Break-off link must be removed from replacement
thermostat.
Heat exchanger damage may result.
Failure to follow these instructions can result in
death, injury, property damage or product damage.
Dial
Set Point 3 Limit Temp.
Set Point 2 Fan On
Set Point 1 Fan Off
Push Screwdriver in
and hold to release
Push in Lock
Wire to Controlled Equipment
Fan Terminals
Limit Stat
Manual
Reset Button
(Red)
Manual Fan Switch
(White)
Pull out for normal operation.
Push in for continuous fan.
Limit Terminals
BREAK-OFF LINK
MUST BE REMOVED
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Attach this information to the wall near the ROBERTS GORDON® heater.
®
Read the installation, Commissioning, Operation and Service Manual thoroughly before installation, operation or service.
OPERATING INSTRUCTIONS
WARNING
1. STOP! Read all safety instructions on this information sheet.
2. Open the manual gas valve in the heater supply line.
3. Turn on electric power to the heater.
4. Set the thermostat to desired setting (above ambient temperature).
The automatic starting sequence begins.
NOTE: Following long shutdown periods, the burner control may go to
to 'LOCKOUT' during the start sequence. Push the reset button to
recommence firing. Contact service department if 'LOCKOUT'
continues (see manual for details).
TO TURN OFF THE HEATER
Fire Hazard
1. Turn the thermostat/time switch to 'OFF'. The burner will turn 'OFF'
immediately, but fans will continue to cool heat exchanger until the fan
thermostat switches off.
Some objects can catch fire or explode when placed
close to heater.
IF THE HEATER WILL NOT OPERATE, TO ENSURE YOUR SAFETY,
FOLLOW THESE INSTRUCTIONS TO SHUT DOWN YOUR HEATER
Keep all flammable objects, liquids and vapors the
required clearances to combustibles away from heater.
1. Set the thermostat to off or the lowest setting.
2. Turn off electric power to the heater.
3. Turn off the manual gas valve in the heater supply line.
4. Call your registered installer/contractor qualified in the installation
and service of gas-fired heating equipment.
Failure to follow these instructions can result in death,
injury or property damage.
Roof Terminal
Installation Clearances
Clearances to Combustibles
Alternative
Wall
Terminal
Air
Intake
Flue
15 cm
15 cm
50 cm**
50 cm
Air Flow
60 cm
Condense Drain
Install to
suitable drain
30 cm
3 m
Insulated
Refrigerant pipes
to cooling coil
by Customer
2.5 - 3.5 m*
Customers
Suitable
Condenser
Unit
**80 cm is necessary to service heater.
Roberts-Gordon, LLC
1250 William Street
P.O. Box 44
Roberts-Gordon Europe Limited
Unit A, Kings Hill Business Park
Darlaston Road, Wednesbury
West Midlands WS10 7SH UK
Telephone: +44 (0)121 506 7700
Fax: +44 (0)121 506 7701
Telephone: 716.852.4400
Fax: 716.852.0854
Service Telephone: +44 (0)121 506 7709
Service Fax: +44 (0)121 506 7702
E-mail: [email protected]
Toll Free: 800.828.7450
Buffalo, NY 14240-0044 USA
E-mail: [email protected]
Installation Code and Annual Inspections: All installations and service of ROBERTS GORDON® equipment must be performed by a contractor qualified in the installation and service of equipment
sold and supplied by Roberts-Gordon and conform to all requirements set forth in the ROBERTS GORDON® manuals and all applicable governmental authorities pertaining to the installation, service
and operation of the equipment. To help facilitate optimum performance and safety, Roberts-Gordon recommends that a qualified contractor annually inspect your ROBERTS GORDON® equipment
and perform service where necessary, using only replacement parts sold and supplied by Roberts-Gordon.
For installations at elevations above 2000' (610 m), the appliance shall be derated 4% for each 1000' (305 m) of elevation above sea level.
Further Information:Applications, engineering and detailed guidance on systems design, installation and equipment performance is available through ROBERTS GORDON® representatives.
Please contact us for any further information you may require, including the Installation, Operation and Service Manual.
This products are not for residential use.
© 2007 Roberts-Gordon, LLC All rights reserved. No part of this work covered by the copyrights herein may be reproduced or copied in any form or by any means – graphic, electronic, or mechanical,
including photocopying, recording, taping, or information storage and retrieval systems – without written permission of Roberts-Gordon.
Printed in U.S.A
P/N 91040089
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