GUH RANGE PROPANE GAS FIRED UNIT HEATERS BENSON GUHA/GUHC RANGE (PROPANE GAS FIRED UNIT HEATER) INSTALLATION COMMISSIONING SERVICING USER INSTRUCTIONS October 2002 (Issue 3) Page 1 of 41
GUH RANGE PROPANE GAS FIRED UNIT HEATERS ~ CONTENTS ~ SECTION 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 2.4 Air Supply 2.5 Flue Installation 2.6 Electrical Installation 2.7 Electrical Panel 2.8 Time Switch 2.9 Room Thermostat 2.10 Fan and Limit Controls 2.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS SECTION B Warranty Registration Updated Information Timer Information Manual SECTION C 10.0 Introduction 10.1 Commissioning / Hand over 10.2 Servicing 10.3 Start up Procedure 10.4 Start up Procedure Automatic Versions 10.5 Stop Procedure Manual / Automatic Versions 10.6 Shut Down Procedure 10.7 Fail-safe Situations 10.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS 1.0 Compliance notices The Benson GUH range of warm air heaters detailed herewith are manufactured by Benson Heating within a strictly controlled environment within the parameters of ISO9001 The Benson GUH Range has been independently tested and assessed, and has been found to meet the Essential Requirements of the following European Directives.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS The Benson GUH range of heaters conform to the following European Harmonised Standards. BS EN 621 1998 Requirements for non domestic gas fired forced convection air heaters for space heating without a fan to assist transportation of combustion air and/or combustion products.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS Cabinet Manufactured from zintec coated steel, finished in a durable stove enameled polyester powder paint. Heat Exchanger Manufactured from aluzinc coated steel, and formed from pressed and welded sections into a multiple clam assembly. Flue Outlet Fabricated from aluzinc coated steel . The part is designed to terminate with a spigot . the assembly incorporates the down draught diverter.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS The installation of the appliance must meet all the relevant European, National, and local criteria. (See sections 2 and 8).
GUH RANGE PROPANE GAS FIRED UNIT HEATERS 1.5 Warranty The heater is supplied with a 1 year warranty on all parts except the thermocouple. In addition to this there is also a 5 year time related warranty on the combustion chamber. The warranty commences from the date of dispatch from the manufacturer, and is subject to the terms detailed within the Benson Heating 'conditions of business'.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS 2.0 Installation Note It is a requirement that only qualified and competent personnel may undertake installation commissioning and servicing of GUH Range Heaters. Warning All of the basic criteria must be satisfied prior to commencing installation and commissioning, additionally, the Unit Heater must be positioned and installed so as to comply with all the relevant standards and guide lines (see section 8.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS In which case the cross- section of the duct must be at least the same as that of the heater discharge grille Where the heater is positioned to discharge through a wall opening a clearance of 2 metres in front of the unit is required to allow for the correct operation of the down draught diverter and access for servicing.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS 2.4 Air Supply Provision must be made for the existence of an air supply in order to satisfy both combustion and ventilation criteria. It is a requirement that the area where the air heater is located must have a permanent air vent of negligible resistance direct to the outside air. Such air vents must be positioned so as not to become blocked or flooded, nor should they be placed so as to introduce undesirable matter (e.g.
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GUH RANGE PROPANE GAS FIRED UNIT HEATERS 2.5 Flue Installation. An integral flue spigot is fitted to all GUH Air Heaters thereby allowing the flue to connect directly to the heater. The design of the flue must ensure that it can be disconnected to allow for cleaning and servicing. Further more all of the flue section joints must face upwards and the seal between the sections achieved through the use of approved caulking string and / or grout.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS Caution It is imperative that the flue should be properly sealed where it passes through the roof, this can best be achieved by using the approved method of roof flashing plate and cravat. The flue outlet on all GUH heaters can be in either vertical or horizontal (top or rear) configuration.
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GUH RANGE PROPANE GAS FIRED UNIT HEATERS 2.6 Electrical Installation All electrical wiring and connections must be in accordance with the relevant European, National, and Local regulations as well as to IEE Standards. Warning Ensure that the Electric and gas supplies are turned off before any electrical work is carried out on the heater.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS Note When external controls operate to switch the heater OFF, power to the heater should remain to allow the fan to continue to operate to sufficiently cool the heater thereby preventing damage to the heat exchanger. 2.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS 2.11 Summer switch A heat / ventilation switch may be fitted remotely and connected between terminals 9. and 4. This switch will allow the fan motor to run continuously. Where the remote control box is used, the burner is automatically inhibited during the summer / ventilation setting. 2.
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GUH RANGE PROPANE GAS FIRED UNIT HEATERS 3.0 Commissioning Note It is a requirement that only suitably qualified and competent personnel are allowed to undertake the commissioning of the heater. It is also strongly recommended that prior to commissioning the engineers familiarises themselves with the heater. the specific requirements of the installation /application, and the information contained within the manual.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS 3.3 Ignition sequence manual versions Warning If during the following sequence of operations the heater fails to operate correctly the fault should be traced and rectified before proceeding, if necessary referring to section 5.0 fault diagnosis.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS q) After ten minutes check burner head pressure is as specification - adjust as necessary by removal of the gas pressure adjustment cover, and using a screwdriver turn the adjustment screw on the governor as follows: Anti clockwise to reduce. Clockwise to increase. r) Check that the gas pressure remains satisfactory for all appliances on the same circuit s) Undertake combustion tests checking CO CO2 and efficiency (see section 7.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS Before commencing any maintenance or servicing work the heater must be shut down and allowed to cool, and have the gas and electric supplies to it turned off at the supply cock and isolator respectively.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS Injectors and Manifold With the pilot bracket assembly removed and the burner tray either fully withdrawn or pulled forward by at least 100mm the manifold and injectors can be removed by using the following procedure. Release the union between the gas valve and the flange, remove the four flange fixing screws.
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GUH RANGE PROPANE GAS FIRED UNIT HEATERS Fig 22 No Operation Check that Limit Stat is not in Fail Safe Position Check Stat Check External Controls are Demanding Heat Check Timer Check there is power to the Heater Check Fuse Check Electrode is not Cracked No Spark Check Electrode Gap is Correct Air in Gas Supply Purge System to Remove Air Check HT leads and Connectors Check that Pilot Adjuster is set Correctly Check Spark Generator Fig 23 Pilot Will Not Light Pilot Line Restricted No Gas Su
GUH RANGE PROPANE GAS FIRED UNIT HEATERS Fig 25 Faulty Wiring from Control to Valve Pilot flame is Established but Main Burner will not Ignite Faulty Control Unit Replace Faulty Second Stage Valve Manual and Automatic Operation Fig 26 Fan will not Run Fan Control is Open Circuit Open Circuit to Fan Motor Check that Fan will run when Main Gas is On Replace Faulty Fan Control Check Wiring and Connections Fig 27 Faulty Motor Fan runs but stops when Main Burner is alight Fan Control is Open Circui
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GUH RANGE PROPANE GAS FIRED UNIT HEATERS SECTION C BASIC USER INSTRUCTIONS 10.0 Introduction The following information is relevant to the Gas fired GUH Cabinet Heater range manufactured by Benson Heating. These heaters are manufactured within a strictly controlled quality system to ISO 9001. All Benson Heating Cabinet Heaters are CE marked, having been found to satisfy the essential requirements of the following European Directives.
GUH RANGE PROPANE GAS FIRED UNIT HEATERS c) Depress and hold in control start button whilst operating igniter until pilot light is present d) Hold in start button for at least one minute to establish pilot - carefully release button confirming presence of pilot (b) The fan motor will continue to run until heat dissipation allows the fan and limit stat to shut down the fan.
