BENSON GUHA User Instructions

Natural gas fired unit heater

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BENSON GUHA/GUHC

Headin

RANGE

(NATURAL GAS FIRED UNIT HEATER)

I N S T A L L A T I O N C O M M I S S I O N I N G

Plac e your mes sage here. F or maximum i mpact, us e two or thr ee sentences.

S E R V I C I N G

U S E R I N S T R U C T I O N S

Issue 5

March 2005

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Summary of Contents for BENSON GUHA

Page 1 BENSON GUHA/GUHC Headin RANGE (NATURAL GAS FIRED UNIT HEATER) I N S T A L L A T I O N C O M M I S S I O N I N G Plac e your mes sage here. F or maximum i mpact, us e two or thr ee sentences.
Page 2 ~ C O N T E N T S ~ S E C T I O N A 1.0 Compliance Notices 1.1 Certificates of Conformity 1.2 General Product Information 1.3 General Requirements 1.4 Delivery & Pre-installation Checks 1.5 Warranty 2.0 Installation 2.1 Installation Clearances and Mounting Heights 2.2 Heater Mounting 2.3 Warm Air Circulation...
Page 3 Operation and Maintenance manuals is done so for information and guidance purposes only and should only be considered valid at the time of the publication. Benson Heating cannot be held responsible from any matters arising from the revision to or introduction of new...
Page 4 1.0 Compliance notices Where proprietary items are incorporated into Benson Heating products, detailed The Benson GUH range of warm air heaters information and instructions are also detailed herewith are manufactured by provided as part of the information pack. Benson Heating within a strictly controlled...
Page 5 BS EN 292 - Part 2 : 1991 household and Safety of Machinery - Basic Concepts, General Principles for Design Technical Principles and Specifications similar BS EN 60204 - Part 1 : 1993 purposes, Safety of Machinery - Electrical Equipment for Machines Specification for General Requirements electrical tools...
Page 7 Department at Benson Heating . welded sections Notified Body PIN Reference is 63AQ0533 into a multiple 1.2 General product information The Benson GUH Range have an output clam assembly. rated at between 15.2kW to 140.7kW, and are available with either axial or centrifugal fans...
Page 8 If any of these points are not satisfied then contact should be made with the Sales Office b) The position of the heater relative to the at Benson Heating as soon as possible by route of the flue telephoning 01547-528534. In the case of...
Page 9 (4) Details or symptoms of fault (5) Installers name and address. Note (i) Faulty parts must be returned to the Benson The warranty may be invalidated if - Heating Spares Department, the address of which is provided on the cover of this a) The warranty registration/commissioning manual.
Page 10 The recommended maximum and minimum exchanger is typically around 34 mounting heights in metres are as follows A full and unobstructed return air path to the air heater must be provided MODEL (see 2.4 Air Supply). 2.73 2.73 3.03 3.33 3.64 1.82 1.82 2.12...
Page 11 Where mechanical ventilation is used it is a If the heater is to be installed within its own requirement that the inlet is of the separate building or plant room, the above mechanical type, and the outlet is either details do still apply, as does the requirement mechanical or natural.
Page 12 should be fitted with access covers, The flue outlet on all GUH heaters can be in again to allow for cleaning and inspection. either vertical or horizontal (top or rear) configuration. The position of the flue and its terminal Note should be such that it does not impair the It should be noted that claims made under combustion process.
Page 13 Not less than Not less than 600mm 600mm Parapet Greater than 1500mm Fig 2 Flat roof with parapet Not less than 600mm Less than 10 h Less than 10 h Greater than 1500mm Fig 3 Flat roof envelope method Not less than 250mm Structure Structure...
Page 14 Not less than 600mm Structure Less than 1500mm Fig 7 Flat roof with structure close to flue outlet Not less than 600mm Not less than 600mm Not greater than ° Fig 8 Pitched roof not greater than 45° Less than 1500mm Not less than 600mm...
Page 15 Not less than 1000mm Not less than 1000mm Greater ° than 45 Fig 10 Pitched roof exceeding 45° Termination on ridge Not less than 600mm Less ° than 45 Fig 11 Pitched roof internal route not exceeding 45° and ridge termination Not less than 600mm Not less...
Page 16 2.6 Electrical Installation of the top corners towards the heater thereby disengaging the lugs). The cover to the electrical panel can be All electrical wiring and connections must be removed by undoing the two screws which in accordance with the relevant European, secure it to the panel.
Page 17: Control Panel
operate to sufficiently cool the heater thereby only exception preventing damage to the heat exchanger. to this is when a 2.8 Time switch Caution Time switches may only be fitted if they are control panel of an approved type, and must have separate motor connections, the motor must be connected to a suitable live and neutral suitable for...
Page 18 control is situated inside the left side panel and is wired in series. Operation of either If there is a requirement for the heater to be switch will shut down the heater switched off over night then the gas valve circuit should be opened via a time switch, On the GUH etc, as per the wiring instructions and...
Page 19 supplier should installations and check that the the effect they meter and may have on service other plant connection to sharing the the heater are supply. capable of If it is necessary to fit a gas pressure booster, the controls must include a low pressure cutoff switch which must be fitted delivering the on the supply / inlet side of the booster.
Page 20 turned off. Note It is a requirement that only suitably qualified and competent personnel are allowed to undertake the commissioning of the heater. (a) Check that all panels and fasteners are It is also strongly recommended that prior to secure and in place. commissioning the engineers familiarises themselves with the heater.
Page 21 If during the following sequence of and conical. operations the heater fails to operate correctly the fault should be traced and o) Check pressure readings on the rectified before proceeding, if necessary manometers, and continue to let the heater referring to section 5.0 fault diagnosis. If for fire for ten minutes any reason the pilot light is extinguished no attempt should be made to re light it...
Page 22 valve, allow the fan to continue to run until the heater is cooled sufficiently for the fan to 4.0 Servicing shut down Warning x) Turn off the electrical supply It is a requirement that only qualified personnel are allowed to carry out installation y) Set thermostat to desired room commissioning or servicing.
Page 23 Check that the Pilot Flame Path is No Spark supplying Heat to the Thermocouple Air in Gas Purge Gas Line Supply Pilot to Remove Air Burner fails to Pilot Feed Check Pilot light Restriction Adjuster is Fully Open and that the Pilot Tubes are not blocked No Gas...
Page 24 Check that Limit Stat is not in Fail Check Stat Safe Position Check External Check Controls are Operation Timer Demanding Heat Check there is Check power to the Fuse Heater Check Electrode is Check Electrode No Spark not Cracked Gap is Correct Air in Gas Purge System Check HT...
Page 25 Faulty Wiring from Control to Valve Pilot flame is Established but Main Faulty Control Replace Burner will Unit not Ignite Faulty Second Stage Valve Check that Replace Fan will run Control is Faulty Fan when Main Open Control Fan will Gas is On Circuit not Run...
Page 26 6.0 Wiring Diagrams GUH 50 to 165 Piezo Ignition GUH 205 – 325 Piezo Ignition...
Page 27 GUH 400-408 Piezo Ignition GUH 50 – 325 Automatic Ignition...
Page 28 GUH 400 – 480 Automatic Ignition CP 2 Control GUH 50 – 325 Piezo ignition...
Page 29 CP 2 Control GUH 50 – 325 Auto reset CP 2 Control GUH 400 — 480 Auto reset...
Page 30 CP 4 Control GUH 50 — 325 CP4 Control GUH 400 — 480...
Page 31 7.0 Technical Data Formulae for calculating efficiency are detailed as follows q1 is the heat of the dry products of combustion (% of heat released per unit volume of gas) q2 is the heat of the water vapour contained in the products of combustion (% of heat released per unit volume of gas) C1 is the mean specific heat of the dry products of combustion...
Page 32 7.2 Unit Heater Models Technical Data MODEL NATURAL GUH50 GUH75 GUH100 GUH125 GUH165 GUH205 HEAT 15.2 22.0 29.3 37.0 48.4 61.6 OUTPUT 51,900 75,000 100,000 126,250 165,140 210,180 HEAT INPUT 20.1 28.2 37.5 47.6 62.3 79.2 (Gross) 68,600 96,200 128,000 162,500 212,600 270,300...
Page 33 7.2 Unit heater Technical Data Cont’d MODEL NATURAL GAS GUH250 GUH285 GUH325 GUH400 GUH480 HEAT 73.3 85.0 95.3 117.3 140.7 OUTPUT 250,000 290,000 325,000 400,000 480,000 HEAT INPUT 93.5 110.7 124.1 151.0 182.7 (Gross) 319,000 377,700 423,400 515,000 623,500 MINIMUM INLET mbar 17.5 17.5...
Page 34 8.0 Reference Information Doc/Ref Title/Subject prEN 621 Non Domestic Gas Fired Forced Convection Air Heaters For Space Heating BS EN 292 Parts 1 and 2; 1992 Safety of Machinery BS EN 60204 Part 1; 1993 Safety of Machinery - Electrical BS EN 60335 Part 1;...
Page 35 9.0 Parts list Part Description GUH 50 GUH 75 GUH 100 GUH 125 GUH 165 GUH 205 Heat Exchanger Assy 33-10-598 33-10-599 33-10-600 33-10-601 33-10-602 33-10-603 Draught Diverter Assy 33-20-598 33-20-592 33-20-559 33-20-606 33-20-607 33-20-611 Gas Train Assembly 33-20-261 33-20-264 33-20-263 33-20-264 33-20-265...
Page 36 Parts list Cont’d Part Description GUH 250 GUH 285 GUH 325 GUH 400 GUH 480 Heat Exchanger Assy 33-10-664 33-10-604 33-10-605 33-10-603 33-10-664 Draught Diverter Assy 33-20-665 33-10-615 33-10-609 33-20-611 33-20-665 Gas Train Assembly Rhs 33-10-683 33-20-554 33-20-554 30-20-266 30-10-683 Gas Train Assembly Lhs 33-10-712 33-10-717...
Page 37 Service Department at Benson Heating 2. Any part 3. Any part manufactured by Benson Heating which fails due to defective materials or poor workmanship within two years from the manufactured despatch date of the heater will be replaced free of charge on a parts only basis.
Page 38 ISO 9001. demanding environment - and the need for regular servicing, carried out by competent All Benson Heating Cabinet Heaters are CE and qualified engineers. marked, having been found to satisfy the essential requirements of the following Caution European Directives.
Page 39 If for any reason the pilot light is instead of the thermocouple as fitted to the extinguished no attempt should be made manual units. to re light it within three minutes The sequence is as follows: as per 10.3 a-i The start signal will ignite the pilot, once the a) Switch on electrical supply flame proving has taken place the main gas...
Page 40 Benson Heating Ludlow Road Knighton Powys LD7 1LP Telephone 01547 528534 Facsimile 01547 520399 Email information@bensonheating.co.uk Web www.bensonheating.com Benson Heating is a Division of Benson Climate Systems Ltd...

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