Technical data

GUH RANGE PROPANE GAS FIRED UNIT HEATERS
Page 9 of 41
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 8.0), as well as meeting national and local fire regulations and
insurance criteria, especially if it is proposed that the heater is to be installed within a special risk area
(e.g. proximity to where petrol engined vehicles are stored or parked, where cellulose spraying takes
place, where woodworking machinery is operated, etc,).
Indirect fired heaters must not be located in hazardous areas, however, it is permissible for the heater to
supply air to such areas. The heater must not be installed within an environment where there is a high
concentration of chlorides, fluorides, salts, or other aggressive or volatile chemicals/compounds.
Nor should the heater be positioned where the burner could be adversely affected by high winds or
draughts.
The heater must be installed so that it is level. Supports for the heater must be sufficiently robust to
withstand the weight of the heater and any ancillary equipment. Any combustible material adjacent to the
heater or flue system must be so placed or shielded so that its surface temperature does not exceed 65C
The location chosen for the heater must allow for the fitting of an effective flue system.
The location must also allow for adequate clearance for the air supply, return air circulation, oil supply,
electrical supply, whilst also providing good and safe working access.
The heater must be installed so that it is level, supports for the heater must be sufficiently robust to
withstand the weight of the heater and any ancillary equipment
Any combustible material adjacent to the heater or flue system must be so placed or shielded so that its
surface temperature does not exceed 65oC. Generally a free blowing heater should be located at a height
(measured from floor level to the base of unit) as detailed within section 2.1
The location chosen for the air heater must allow for the fitting of an effective flue system. It must also
allow adequate clearance for the air supply, return air circulation, gas supply, electrical supply and also
provide good service access.
Suspended free blowing Unit Heaters are at their most effective when located as close to the working
area as possible. However care should be exercised to avoid directing the discharged air directly onto the
occupants of the area to be heated.
Where the passage of cold air causes problems (eg by entrances, loading bays etc) it is considered
favourable if the heater is positioned so as the discharge towards or across the cold air source from a
distance from 1.5m - 6m dependent upon the size of the entrance and the air throw characteristics of the
heater. On exposed walls heaters should be positioned so as to discharge towards, or along the length of
the exposed wall.
In areas where it is proposed that more than one heater is to be installed, a general scheme of circulation
should be drawn up and maintained, thereby offering the best heat distribution. Air pressure within the
area heated and the outside air pressure must remain the same, factors influencing this would be the
presence of extraction systems, ventilation systems, and various types of process plant.
GUH (A) Heaters are only suitable for free blowing applications or where the duct length does not
exceed 2 metres.