Roberts Gorden Dualair DA260G Series Operating instructions

FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. DO NOT try to light any appliance.
. 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.
Do not store or use petrol or other
flammable vapours and liquids in the
vicinity of this or any other appli-
ance.
Failure to follow these instructions
can result in death, injury or property
damage.
WARNING
Improper installation, adjustment, alteration,
service or maintenance can result in death, injury
or property damage. Read the Installation,
operation and service manuals thoroughly before
installing or servicing this equipment
Installation must be done by a contractor qualified
in the installation and service of gas/oil fired
heating equipment (whichever is applicable).
Installer
Please take time to read and understand these
instructions prior to any installation. Installer must
give a copy of this manual to the user/owner.
Owner/User
Keep this manual in a safe place close to the heater
to provide your serviceman with information should it
become necessary.
Roberts-Gordon Europe Ltd.
Oxford Street
Bilston, West Midlands WV14 7EG UK
Telephone: [phone]
Fax: [phone]
email: [email protected]
www.combat.co.uk
www.rg-inc.com
V1
Heating & Cooling Unit
DA260G AND VARIANTS
DA300G AND VARIANTS
DA300L AND VARIANTS
DA325G AND VARIANTS
DA380G AND VARIANTS
DA380L AND VARIANTS
Installation, Commissioning,
Service & User Instructions
WARNING
Fire Hazard
X525 02/03
© Copyright 2002 Roberts-Gordon

Details of condense drain for cooling coil

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The gas heater section of these appliances have been tested and certified as
complying with the essential requirements of the Gas Appliance Directive,
The Low Voltage Directive and The Electromagnetic Compatibility Directive
for use on natural gas and L..P.G. gas when installed, commissioned and
maintained in accordance with these instructions . The complete appliances
comply with the requirements of the Machinery Directive .
These instructions refer to appliances designed to operate in the following
countries:
Ireland (IE), Spain (ES), Italy (IT) & United Kingdom (GB ).
Appliances designed for other countries are available on request.
This Appliance must be installed in accordance with the rules in force and
used only in a sufficiently ventilated space, as specified in these instructions.
Before installation, check that the local distribution conditions, nature of gas
and pressure, and adjustment of the appliance are compatible.
IMPORTANT NOTE
ForheatersfittedwithModulatingor High/Lowburners,theseinstructions shouldberead inconjunction
with the relevant sections of the Supplement Manual supplied with the heater.

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Contents
The parts of this manual are numbered by section, clause and sub-clause. Hence 1:2:3 refers to
Section 1, clause 2, sub clause 3. Figure numbers also follow this notation, hence Fig. 2:3 is Section
2, Fig. 3.
SECTION
1. General Specification
2. Technical Data
3. Heater Installation
4. Commissioning of the Air Heater
5. Wiring Diagram
6. Servicing Instructions
7. Removal and Replacement of Parts
8. Fault Finding Charts
9. User Instructions
10. Conversion between natural gas and L.P.G - On/Off burners only
11. Parts List
12. Commissioning Data Sheet
THE AIR HEATER SECTIONS OF THE ON/OFF BURNER APPLIANCES ARE FOR USE WITH
NATURAL GAS OR L.P.G ONLY AS STATED ON THE HEATER DATA PLATE (Conversionbetween
gasses must be carried out in accordance with section 10 of these instructions)
THESE INSTRUCTIONS ARE TO BE LEFT WITH THE USER OR NEAR THE HEATER
Note:Everyeffortismade toensurethatthe informationcontainedinthis Manualisaccurate. However,
Roberts-Gordon reserves the right to alter specifications without prior notice.
Roberts-Gordon shall not be liable to rectify any defects or damage caused by any modifications
madeor attemptedtobemade totheheating unitsbythe customer, hisservants,agentsor employees.

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Section 1. General Specification - DualAir® Unit
1.1 Basic Information
1.1.2 Description
The DualAir® combined heating and cooling unit is formed by four sections combined into a single
unitand deliveredas acomplete assemblyreadyfor installationon site.The DualAir®unit isdesigned
to be installed with the air flow from right to left as shown in Fig 1.1. Units with opposite air flow
direction are available by special order.
The four sections are as follows:-
1.1.3 Gas Fired Heater Section
The heater section is a CUHD/A 300 or the CUHD/A 380 automatic ignition unit heater and contains
the burner controls, the electrical terminal box for the system, the control relays for the operation of
the heater/cooling equipment, and the transition piece between the heater and the fan compartment.
The heater is an open flued gas fired heater of flue type B11 for vertical flue.
The On/Off heaters are Cat II 2H3+ appliances for use with Natural Gas or L.P.G. as stated on the
heater data plate (Modulating and High/Low burners are Cat I2H for use with Natural Gas only), and
are intended for indoor installation only. They must be installed and commissioned in accordance
with local regulations and the requirements of Section 3 of these Instructions.
Apermanent electricalsupply of400 volts50 Hz,threephase andNeutral isrequired forthe operation
of the heater and fan and all models must be earthed. (Note the burner operates on 230v 50 Hz taken
internally from the above supply).
1.1.4 Fan Section
The fan section houses the double-inlet, belt-drive centrifugal blower fan and three phase electric
motor. This section of the cabinet is fully insulated with foil faced glass fibre insulation.
The fan rotation is counter clockwise viewed from the control side as marked on the fan case.
1.1.5 Cooling Coil
DualAir® units can be fitted with either a DX or Chilled Water cooling coil:
1.1.5.1 DX Coil
The DX cooling coil is installed into the DualAir® unit with the two refrigerant circuits sealed ready for
site connection. There are no other refrigerant controls supplied with the coil and all refrigerant pipe-
work and controls must be supplied by the installer to suit the equipment being installed with the
condenser units.
DXcoils aredesignedfor operationat anambienttemperature of28°Cusing R22orR407C refrigerant
evaporating at 6°C.
Theinstallation ofthecooling condensersandtherefrigerantcircuitsmustbe carriedoutin accordance
with the condenser manufacturers instructions.

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1.1.5.2 Chilled Water Coil
A single chilled water coil can be fitted as an option. This type of coil is designed to operate at 6°C
'Water On' temperature. There is no other equipment supplied with the coil and all chilled water pipe-
work and controls must be supplied by the installer to suit the equipment being installed with the
Chiller units.
The installation of the Chiller units and the refrigerant circuits must be carried out in accordance with
the condenser manufacturers instructions.
1.1.6 Filters
Thestandard filterssuppliedwith theDualAir®unit areFarr3030 gradeEU4.These filtersarerequired
to protect the cooling coil from airborne particles.
Filters must be fitted and maintained to ensure proper operation of the equipment.
1.1.7 Controls
See Section 3.9
1.2 Heater Operation
1.2.1 Automatic Ignition Burner
Roberts-Gordon CUHD/A range warm air heaters are fitted with an automatic ignition control which
ignites the gas and monitors for the safe operation of the burner each time the external controls call
for the heater to operate.
1.2.2 Operation - Heater Section
When the external controls call for heat, the burner operates to supply heat to the heat exchanger.
The air delivery fan will also start to run turned on by the fan relay, supplying warm air to the building.
When the external controls are satisfied they will turn off the burner leaving the fan running to cool
down the heat exchanger. When cool enough the fan thermostat will turn off the fan.

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Fig 1.1 General Arrangement
Air Flow
MainHeaterSection
Flue
AirOutletSpigot
BurnerControls MainFan Unit CondenseDrain
Cooling Coil
FilterPanels
AirInletSpigot
Connectionsfor
refigerantpipework
FilterPanels
access
ElectricalTerminal
boxforall connections

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Fig. 2.1 DualAir® 300 Module - Dimensions
Section 2. Technical Data
FRONT VIEW REAR VIEW
SIDE VIEW

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Fig. 2.2 DualAir® 380 Module - Dimensions
FRONT VIEW REAR VIEW
SIDE VIEW

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Fig. 2.3 Design Graph - DualAir® 300 - DX COIL
Fig. 2.4 Design Graph - DualAir® 380 - DX COIL
Graph of Air Flow v Static Pressure for
Model DualAir 300 Range with 4.0kW Motor
0
20
40
60
80
100
120
140
160
180
200
2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3
Air Flow m3/sec
Static Pressure Pa
Air flow with 118 mm motor pulley
Graphof Air Flow vStatic Pressure
for ModelDualAir®380 (DX Coil) with 4.0kw Motor
0
50
100
150
200
250
300
350
2.6 2.8 3 3.2 3.4 3.6 3.8 4 4.2
Air Flow m³/sec
Static Pressure Pa
Air Flow 125 mm Pulley