BENSON HEATING RS/UHA2 50, RS/UHA2 80, RS/UHA2 105, RS/UHA2 140, RS/UHA2 200 Technical Information, Assembling Instructions, Use And Maintenance

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Gas room sealed unit heaters 2 stage

TECHNICAL INFORMATION ASSEMBLY

INSTRUCTIONS, USE AND MAINTENANCE

RS/UHA-2

BENSON HEATING

LUDLOW ROAD

KNIGHTON

POWYS

LD7 1LP

MAY 2003

Benson Heating is a divison of

Benson Climate Systems Ltd

COMPLIANCE NOTICES

The Benson RS/UHA2 range of warm air heaters detailed herewith are manufactured for Benson Heating within the parameters of ISO 9002.

The Benson RS/UHA2 Range has been independentl y tested and assessed, and h as been found to meet the Essential Requirement of the following European Directives:

Gas appliance Directive (90/396/EEC) Machinery Directive (89/392/EEC) 91368/EEC 93/44/EEC 93/65/EEC Low Voltage Directive (73/23/EEC Electromagnetic Compatibility Directive (98/336/EEC and 91/31/EEC) Product Liability Directive (65/374/EEC)

The manufacturer has taken reasonable and practical steps to ensure th at Benson RS/UHA2 Ra nge of Heaters are safe and without risk when properly used. These heaters should therefore only be used i n the manner and pu rpose for which they were intended, and in accordance with the recommendations detailed herewith. The heaters have been designed, manufactured, assembled, inspected, and tested, with safety and quality in mind, there are certain basic precautions which the installer and user should be a ware of, and they are strongly advised to read the appropriate sections of the information pack accompanying the heater, prior to installation or use.

Benson Heating supports all new products being supplied to their customers with a comprehensive infor m ation pack; this clearly defines mandatory instructions for the safe installation, use, and maintenance, of the appliance(s).

Where proprietary items are incorporated into Benson Heating products, detailed information and instructions are also provided as part of the information pack.

It is the responsibility of the installer, owner, user, or hirer, of such products supplied by Benson Heating, to ensure that they are familiar with the appropriate information/manuals, supplied by the manufacturer, and that they are suitably aware of the purpose of the manuals and the safety instructions. In addition, operators must be suitably trained i n the use of the appliance so as to ensure its continued safe and efficient use.

Benson Heating has a commitment to continuous improvement, and therefore reserves the right to amend or chan ge the specification of the RS/UHA2Heater range subject to agreement from The Notified Body.

Contained within the text of the manual, the words 'Caution' and 'Warning' are used to highlight certain points. Caution is used when failure to follow or implement the instruction(s) can lead to premature failure or damage to the

heater or its component parts. Warning is used when failure to heed or implement the instruction(s) can lead to not only component damage, but also

to a hazardous situation being created where there is a risk of personal injury.

Notified Body PIN Reference is

RANGE

Type Model Code

1 RS/UHA2 50

3TAIT2C016

2 RS/UHA2 80

3TAIT2C026

3 RS/UHA2 105

3TAIT2C036

4 RS/UHA2 140

3TAIT2C046

5 RS/UHA2 200

3TAIT2C066

6 RS/UHA2 260

3TAIT2C086

7 RS/UHA2 325

3TAIT2C106

INDEX

GENERAL

Description of equipment page. Identification “ Description “ Identification “ Description “ Technical data “ Wiring diagram “ Remote control connections “ Regulating air flow “

FOR THE USER

Operation “ Servicing “ Heater indication lights “ Receipt of product “ Transport “ Dimension “

FOR THE INSTALLER

Location “ Wall bracket dimensions “ Gas connection “ Flue and combustion options “ Electrical control panel “ Electrical connections “

TECHNICAL ASSISTANCE SERVICE

Pre commissioning checks “ Initial start up “ Gas conversion “ Thermostat operation “ Control “ Maintenance “ Fault finding “

Heaters type 1-2-3-4-5

FAN 1

FAN 2

IMT

II°

I°

230V 50Hz

IGN1

COMCOM

NA NC

ION

EA1

J11

J17

J14

J16 J13

RSTR

EVG1-I°

EVG1-II°

RST

J10

J9 J12

SND

J15J18

KEY: SND Temperature probe

TR Regulatory control thermostat (auto reset) LM LIMIT thermostat (manual reset) EVG1-I° Gas solenoid valve1 EVG1-II° Second stage gas valve 2 C Fan capacitor FAN 1 Axial fan 1 FAN 2 Axial fan 2 (t ype 5) F1-F2 Line fuse (6,3 A) LF Green working light LL High temperature indication light LB Lockout indication RST Lockout reset EF Flue venter

PA Differential pressure switch IGN1 Ignition transformer EA1 Spark electrode ION Ionisation probe SE Electrical control board IMT (*) Fused isolator MS (*) Fire damper connection (accessory) RSTR (*) Remote reset connection TA (*) Room thermostat connection VM (*) Fan switch connection SF (*) Second stage gas valve connection

(*) External to the heater customer supply.

Heater type 6-7

IGN2

EA2

IGN1

COMCOM

NA NC

ION

EA1

J11

J17

J14

J16 J13

RSTR

EVG2-I°

EVG1-I°

EVG2-II°

EVG1-II°

RST

J10

J9 J12

SND

J15J18

IMT

230V ~ 50Hz

II°

I°

FAN 1

FAN 2

FAN 3

KEY: SND Temperature probe TR Regulatory control thermostat (auto reset) LM LIMIT thermostat (manual reset) EVG1-I° Gas solenoid valve 1 EVG2-I° Gas solenoid valve 2 EVG1-II° Second stage gas valve 1 EVG2-II° Second stage gas valve 2 C Fan capacitor FAN 1 Axial fan 1 FAN 2 Axial fan 2 FAN 3 Axial fan 3(Type 7) F1-F2 Line fuse LF Green working light LL High temperature indication light LB Lockout indication

RST Lockout reset button EF Flue venter PA Differential pressure switch IGN1 Ignition transformer 1 IGN2 Ignition transformer 2 EA1 Spark electrode 1 EA2 Spark electrode 2 ION Ionisation probe SE Electrical control board IMT (*) Fused isolator MS (*) Fire damper connection (accessory) RSTR (*) Remote reset connection TA (*) Room thermostat connections VM (*) Fan switch connections SF (*) Second stage gas valve connection

(*) External to the heater customer supply.

GAS CONVERSION

The heaters are supplied ready for use with (G20) Natural Gas as p er the table belo w Conversion kits are availab le from the manufacturer:

Natural Gas (G20)

TYPE 1 23456 7

Number of injectors 1 1 1 1 2 2 4 N° Diameter of injectors 3,10 410 480 555 500 540 450 mm/100 Gas supply pressure 20 mBar Head pressure high fire 11,0 13,0 13,0 13,0 10,0 13,0 10,5 mBar Head pressure low fire 6,0 7,0 6,5 6,5 7,0 6,5 5,0 mBar

BEFORE CHANGING INJECTORS ENSURE GAS SUPPLY IS ISOLATED

INSTRUCTIONS FOR CONVERSION TO PROPANE GAS G(31)

1. Change the injectors

2. Adjust the gas inlet pressure

3. Adjust the head pressure

4. Fit primary air diaphragm (if required )

5. Fit adhesive label supplied with kit indicating gas type

6. Ensure settings are correct as per the manual and data plate

CHANGE INJECTORS:

To change injectors: Unscrew the natural gas injectors and replace them with the correct size injectors for propane as shown in table below:

Propane gas (G31)

TYPE 1 23456 7

Number of injectors 1 1 1 1 2 2 4 N° Diameter of injectors 190 250 280 335 285 320 255 mm/100

Replacing injectors single manifold (type 1-2-3-4-6)

Replacing injectors 2 per manifold (type 5-7)

Check the size stamped on the side of the injector is correct to the data in the manual.

Ensure that the new injectors are correctly fitted in the manifold and are gas tight, When the conversion is complete fix the transfer supplied

with the kit showing the correct gas pressure on to the manifold Test for gas soundness on completion Ensure that the aluminium washers supplied for (types 5–7) are fitted when changing the injectors.

If the gas line has not been correctly purged ignition

may not take place at the first attempt resulting in

the heater going to lockout

Reset the lockout before re starting ignition sequence

Before each attempt at ignition it is necessary to wait at least 10 seconds

• Connect the manometer on to the pressure test point PM and check inlet gas pressure if correct connect manometer to test point PV and start heater with heater running ensure the gas pressure corresponds to that shown on the data plate adjust by altering the screws RP1 and RP2 on the gas valve

• Check that the gas consumption reading corresponds with that indicated in the TECHNICAL DATA section Set on/standby switch to standby when heater is sufficiently cool isolate gas supply

• Remove manometer ensure the screw at the test point is tightened test for gas leaks

• Open the gas isolating cock switch on the electrical supply set the room thermostat to the desired temperature.

• T he heater is now ready for operation

GAS VALVE Model SIT 843 (two stage)

The heater must only be operated with the burner compartment door(s) closed

STOPPING

To stop the heater use only the room thermostat Set it to the minimum temperature The fan will stop after 3 minutes or when the heat exchanger is sufficiently cool If required switch off the electricity supply at the isolator

The main electrical supply must not be switched off or used as a method of stopping the heater except in an emergency until the heater has cooled down sufficiently preventing damage to the heat exchanger Interruption of electrical supply whilst heater is in operation will cause it to go to overheat and may damage the heat exchanger the LIMIT thermostat will operate and this will have to be manually re set.

PM Inlet pressure test point. PV Head pressure test point RP1 Cross cut screw low fire adjuster RP2 Hexagonal screw high fire adjuster

Assembly of primary air diaphragm: Diagram showing the fitting of a primary air

diaphragm to single burner manifold (1-2-3-4-6)

Diagram showing the fitting of a primary air diaphragm for a two burner manifold type (7)

Warning the diaphragm plates should only be used when using propane gas G31.

Gas conversion adhesive label:

Once the heater has been converted to propane ensure that the correct label is fitted to the burner overtop of the factory fitted one covering it completely. It is recommended that the diameter of the nozzles be checked also that the pressure corresponds to that shown on the data plate provided Ensure that all of the additional gas components are correct for the installation (including storage tank, pipes and pressure valves etc Ensure that the pressure regulators are sealed after carrying out the conversion.

GAS PRESSURE REGULATION

To regulate the gas inlet pressure :

• Connect a manometer onto the gas valve test point (PM)

• Adjust the inlet gas supply regul ator (customer installation) to pressure indicated on data plate:

To regulate the gas head pressure to the burner:

• Connect a manometer onto the gas v alve test point (PV)

• Adjust the pressure regulating adjusters RP1/ RP2 as detailed on next page to obtain correct pressures indicated in table below:

Propane gas (G31)

TYPE 1 23456 7

Gas supply pressure 37 mBar Head pressure max 35,5 35,0 35,5 35,5 34,5 35,5 34,5 mBar Head pressure min 20,0 18,0 18,5 18,0 18,0 18,0 18,5 mBar

Gas inlet pressure must not exceed 60 mbar at the gas valve inlet.

Gas valve head pressure setting high fire Propane G31:

When setting the gas pressure for propane high fire (second stage ) contact SF should be closed the high fire pressure adjusting screw on the gas valve must be excluded. Connect a manometer on test point PV

Remove the plastic cover from the adjuster RP1 RP2 With a screw driver hold the adjuster RP1 stationary and using a spanner, screw adjuster RP2 clockwise to the bottom of the thread until the correct pressure according to the data plate is achieved .

Gas valve head pressure setting low fire Propane G31 :

When setting the gas pressure for propane low fire (first stage) contact SF should be open. The low fire pressure should be adjusted to the settings shown on the data plate and the data in the manual provided by adjusting screw RP1 Clockwise increases the pressure

Anti clockwise to decrease the pressure On completion replace the plastic cover and seal with paint Remove manometer ensuring that the test point screw is gas tight

Gas valve gas SIT 843

On heaters with 2 gas valves the pressure regulation must be carried out on both gas valves

FAULT FINDING

If the heater is not working firstly check the following :

• Check electric al supply

• Check voltage is as stated +15%, -15%

• Check gas supply is on

• Check that the pressure is as stated in the TECHNICAL DATA

FAULT CAUSE SOLUTION

No operation



No electrical supply



Check main isolator. Check supply cables Check line fuses. Check electrical connections

No spark ignition.

Flue venter working No indication lights on



Differential pressure switch not working



Check flue pipe and combustion air pipe are clear.



Faulty differential pressure switch



Replace differential pressure switch



Poor connection at pressure switch



Check air pipe to switch is connected and not damaged Check electrical connections Check that pipes are condensate free .



Faulty flue venter



Replace flue venter



Faulty control panel



Replace control panel



Faulty ignition electrode



Check ignition probe is not cracked or damaged

Replace the ignition probe

No ignition

Flue venter working No indication lights on



Room thermostat open



Check room thermostat.



Faulty flue venter



Replace flue venter



Faulty control panel



Replace control panel

Burner lights but locks out after 5 seconds



Live and neutral inverted Poor earth



Check electrical connections



Faulty ionisation probe



Check electrical connection on probe.

Check probe for cracks or damage.

Replace ionisation probe .



Faulty ignition



Check the gas type is suitable for the heater.

Check the inlet gas pressure. Check the head pressure. Check the gas supply pipes

have been properly purged of air .

Explosive start up.



Faulty ignition electrode



Replace ignition electrode



Incorrect electrode position



Reposition electrode correctly over the burner bar.



Faulty burner tube



Replace the burner tube



Faulty ignition transformer



Replace ignition transformer



Faulty ignition



Check the gas type is suitable for the heater.

Check the inlet gas pressure. Check the head pressure. Check the gas supply pipes

have been properly purged of air .



heat exchanger dirty



Check / clean heat exchanger

Burner shuts down then re lights automatically .

No indication lights on.



Pressure differential switch not operating correctly



Check that air pipe to switch not damaged or blocked. Check that the flue and combustion air pipes are clear.

Check that the thermal overload on the flue venter has not operated



Faulty pressure differential switch



Replace differential switch



Room thermostat in warm air flow



Check position of thermostat

Burner goes out due to the intervention of the SND thermostat and is restarted automatically when the heater has cooled down .

Yellow indication light on.



Excessive heat exchanger temperature



Check inlet gas pressure Check burner head pressure Check that gas type is suitable

for heater Check injector size is correct for

the heater.



Excessive air temperature due to insufficient air flow over heat exchanger.



Check the fan blades are clean Check that the horizontal and

(vertical if fitted) louvers are sufficiently open. (see in installation section of manual)

Check that the fan speed is correct and the air flow over the chamber is sufficient.



Faulty SND thermostat or control panel



Replace SND thermostat or control panel

Burner goes out due to the intervention of the TR thermostat and is restarted automatically when the heater has cooled down .

Yellow indication light on.



Excessive heat exchanger temperature



Check inlet gas pressure Check burner head pressure Check that gas type is suitable

for heater Check injector size is correct for

the heater.



Excessive air temperature due to poor air flow



Check the fan blades are clean Check that the horizontal and

(vertical if fitted) louvers are sufficiently open. (see in installation section of manual)

Check that the fan speed is correct and the air flow over the chamber is sufficient.



Faulty thermostat



Replace thermostat

Burner goes out due to the intervention of the LIMIT thermostat (LM).

Yellow light flashing



Excessive heat exchanger temperature.



Check inlet gas pressure Check burner head pressure Check that gas type is suitable

for heater Check injector size is correct for

the heater.



Excessive air temperature due to poor air flow over heat exchanger



Check the fan blades are clean Check that the horizontal and

(vertical if fitted) louvers are sufficiently open. (see in installation section of manual)

Check that the fan speed is correct and the air flow over the chamber is sufficient..



Faulty thermostat



Replace thermostat



Faulty fan



Check fan capacitor Check fan motor.



Intervention of thermal overload on fan



Check electrical absorption Replace fan motor



Faulty fan operation



Change fan control or SND thermostat

Heater at lockout

Red lamp illuminated



Faulty ignition



Check inlet gas pressure Check burner head pressure Check that gas type is suitable

for heater Check that gas line has been

purged correctly.



Faulty ionisation probe



Check electrical connection to the probe.

Check probe is not cracked or damaged Change probe or probe lead



Faulty ignition electrode



Replace ignition electrode.



Faulty solenoid



Replace solenoid



Dirty gas filter



Clean filter

The control panel will not reset .

Red light on



Faulty flame control module



Replace the flame control module after first checking the electrical connections

Fan works intermittently



Defective fan control



Change fan control or SND thermostat



Insufficient gas pressure



Check that the gas type is suitable for the heater .

Check the gas pressure Check burner head pressure.

The fan does not work.



Defective fan control



Change fan control or SND thermostat



Faulty fan



Check fan capacitor. Check the fan motor .

The heater works continuously with out reaching the required temperature



Heater to small for application

Insufficient gas pressure



Re check heat output required for the application

Check that the gas type is suitable for the heater .

Check gas pressure. Check burner head pressure.



Dirty heat exchanger



Clean heat exchanger

B22: Single flue option with condensate tee and roof terminal combustion air from inside the room

Type 1 – 2 – 3 – 4

MIN 300

MAX 10000

140

132

970

410

Ø100

✴

157 mm type 1 – 2 – 3 165 mm type 4

ITEM DESCRIPTION

Pipe M/F ∅100 L=1000 with seal

Terminal with guard

∅

100

U Condensate Tee with drain point

Pipe M/M ∅100 L=200 without seal

NOTE IMPORTANT:

MODEL

1-2-3-4

∅ FLUE SPIGOT

∅

100 female

∅ COMBUSTION AIR SPIGOT

∅

100 female

INSTALLATION

Flue should be adequately supported

each bend corresponds to approx 0,8-1 meter of horizontal pipe work

B22: Single flue option with condensate tee and roof terminal combustion air from inside the room

Type 5 – 6 – 7

410

970

Ø100

MIN 340

MAX 10000

132

165

ITEM DESCRIPTION

Pipe M/F ∅100 L=1000 with seal

Terminal with guard

∅

100

U Condensate tee with drain point

Pipe M/F ∅100 L=250 with seal

NOTE IMPORTANT:

MODEL

5-6-7

∅ FLUE SPIGOT SIZE

∅

100 male

∅ COMBUSTION AIR SPIGOT SIZE

∅

150 male

INSTALLATION

Flue should be adequately supported

Each bend corresponds to approx 0,8-1 meters of horizontal pipe work

MAX 10000

Ø100

175

132

970

235

140

MIN 300

Ø150

C32 Installation showing Vertical co axial flue terminal with condensate drain

Type 1 – 2 – 3 – 4

✴

157 mm type 1 – 2 – 3 165 mm type 4

ITEM DESCRIPTION

Flue pipe M/F ∅100 L=1000 with seal

Bend 90° M/F ∅100 with seal

Vertical co axial roof terminal kit

∅

100-100

U Condensate tee with drain point

pipe M/M ∅100 L=200 without seal

NOTE IMPORTANT:

MODEL

1-2-3-4

∅ FLUE SPIGOT SIZE

∅

100 female

∅ COMBUSTION AIR SPIGOT SIZE

∅

100 female

INSTALLATION

Flue should be adequately supported

each bend corresponds to about 0,8-1 meters of horizontal pipework

MIN 10000

115

970

410

MIN 340

185

Ø100

Ø150

165

Ø160

C32 Installation showing Vertical co axial roof terminal with condensate drain

Type 5 – 6 – 7

ITEM DESCRIPTION

Pipe M/F ∅100 L=1000 with seal

Pipe M/F ∅150 L=1000 with seal

Bend 90° M/F ∅150 with seal

Vertical co axial roof terminal kit

∅

100-150

Adaptor F/F ∅150 L=200 with seal

Bend 45° M/F ∅150 with seal

Pipe M/F ∅150 L=140 with seal

Bend 90° F/F ∅100 with seal

U Condensate tee with drain point

Pipe M/F ∅100 L=250 with seal

NOTE IMPORTANT:

MODEL

5-6-7

∅ FLUE SPIGOT SIZE

∅

100 male

∅ COMBUSTION AIR SPIGOT SIZE

∅

150 male

INSTALLATION

Flue should be adequately supported

each bend corresponds to about 0,8-1 meters of horizontal pipework

BENSON HEATING RS/UHA2 50, RS/UHA2 80, RS/UHA2 105, RS/UHA2 140, RS/UHA2 200 Technical Information, Assembling Instructions, Use And Maintenance

Specifications and Main Features

Frequently Asked Questions

User Manual