Technical data

GUH RANGE PROPANE GAS FIRED UNIT HEATERS
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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.
2.12 Gas installation
Warning
Only qualified and competent personnel are allowed to undertake the installation, commissioning, and
servicing of Unit Heaters
The GUH propane range of heaters are all manufactured and pre set for use with Propane Gas, and all
feature 3/4” BSP connection points. Prior to installation the supply characteristics (gas type and pressure)
must be checked to ensure that they are in accordance with the data plate on the heater.
The gas supplier should check that the meter and service connection to the heater are capable of
delivering the required volume of gas, thereby ensuring that the minimum burner pressure can be
achieved. Consideration should be given to the pressure drop on single and multi heater installations and
the effect they may have on other plant sharing the supply.
If it is necessary to fit a gas pressure booster, the controls must include a low pressure cutoff switch
which must be fitted on the supply / inlet side of the booster. It is also a requirement that the gas supplier
is advised prior to the installation or fitting of the booster.
Each heater supply must be fitted with a separate isolating cock positioned adjacent to and upstream of
the union which must be sited outside the heater.
An approved gas jointing compound must be used on all joints and unions and the system purged and
tested for soundness prior to final connection
The connection to the heater can be made by way of either an approved flexible coupling or rigid
connection . Threaded connections must comply to ISO 288/1 or ISO 7/1 further information concerning
accepted European practice is detailed in June 1995 version of prEN1020 Annex 7.
The diameter of the pipework from the isolating cock to the burner must not be less than the diameter of
the connection into the multiblock.
Note
Reference to The Institute of Gas Engineers publications Utilisation Procedures IGE/UP1 and IGE/UP2
together with reference to BS6891 is strongly advised.