Form WA/010, Page 8
3.0 GENERAL REQUIREMENTS (cont'd)
4.0 INSTALLATION
4.1 Uncrating and Preparation
Prior to despatch, the unit was operated and tested at the
factory. If the heater has incurred any damage in shipment,
file a claim with AMBI-RAD within 48 hours.
Check the data plate for the gas specifications and electri-
cal characteristics of the heater to be sure that they are com-
patible with the gas and electric supplies at the installation
site. Read this booklet and become familiar with the instal-
lation requirements of your particular heater. Before be-
ginning, make preparations for necessary supplies, tools,
and manpower.
Check to see if there are any site-installed options that need
to be fitted on the heater prior to installation. Each of the
option packages includes a list of components and com-
plete, step-by-step instructions. For a brief explanation of
frequently specified site-installed options, see Section 5.
Afterbecomingfamiliarwiththe instructions, assemble and
install the options that are required for your heater.
4.2 Fitting the Heater
Before fitting the heater, check the supporting structure to
be used to verify that it has sufficient load-carrying capac-
ity to support the weight of the unit and the ancillary equip-
ment. See weights in Table 11.
Where the location of the air heater is such that it might suffer external me-
chanical damage, i.e., from overhead cranes, fork lift trucks, it must be suit-
ably protected.
When lifting a centrifugal-blower unit, support the blower and motor to pre-
vent the unit from tipping. When lifting a unit with a blower cabinet, support
the blower cabinet. Blower models may have legs to support the blower as-
sembly during shipping. After the unit is fitted at the site, these legs should be
removed.
Materialusedto support any heater whether suspended or base mounted should
be corrosion resistant and of sufficient strength. The gas supply pipe and
electrical connections should not support any of the weight of the heater.
WARNING:Unitsmustbe level forproperoperation.
Do not place or add additional weight to the heater.
The flue must terminate outside the building in a freely exposed
position so as to prevent products of combustion from entering any
opening in a building.
If the flue passes through a wall or ceiling of combustible material,
it must be enclosed by a sleeve of non-combustible material and
separated from the sleeve by at least 25 mm (1 inch) air gap. The
temperature of any combustible material near the flue or heater must
not exceed 65oC when the heater is in operation. The flue must also
be at least 50 mm (2 in.) from any other combustible material.
The joint between the female flue socket of the heater and the flue
mustbe sealed. If twinwallflue piping is used,theappropriate adapter
must be fitted.
The joints between the flue and the roof must be made good to pre-
vent water ingress.
3.4 Gas Supply Pressure
These heaters are designed to operate on either G20 natural gas or
G31 propane gas. Refer to Tables 3 and 4 or the data plate for mini-
mum and maximum supply pressure. Before installation, check that
the local distribution conditions, nature of gas and pressure, and
adjustment of the appliance are compatible.
The gas meter and service must be checked by the gas supplier to
ensure that it is adequate to deal with the total connected load of the
completed installation.
The installation must comply with British Standard 6891, and the
complete installation including the meter must be purged and tested
for soundness as described in the above standard and in British Gas
Document IGE/UP/1.
3.5 Air Distribution System
Recommendations for the air distribution system are given in the
document entitled “Standards of Installation for Gas Fired Indus-
trial Warm Air Heaters”.
The following notes are of particular importance...
“For free-blowing units, it must be taken into account that the buoy-
ancy of the heated air leaving the heater and air patterns with the
space being heated will modify the air throw pattern achieved.
In buildings having a low heat loss where single units are required
to cover a large floor area and in buildings with high roof or ceiling
heights, air recirculation may be fitted to ensure even heat distribu-
tion and minimise stratification respectively. Care should be taken
to avoid impeding the air throw with racking, partitions, plant ma-
chinery, etc.”
Various outlet configurations are available as optional extras to
modify the air throw pattern to suit particular site conditions. (See
Section 5).
3.6 Electrical Supply
Wiring external to the air heater must be installed in accordance
withlocal requirements and meet nationalregulations including I.E.E.
Regulations. Wiring must be carried out by a qualified electrician.
A constant 220-240V, 50 Hz single phase supply is required for all
heaters equipped with axial fan(s) for air delivery. Depending on the
electrical components, heaters with a centrifugal blower may use
either 220-240V, 50 Hz single phase or 415V, 50Hz three phase
supply. All heaters and controls must be correctly earthed. An isola-
tor with a contact separation of at least 3 mm on all poles should be
installed adjacent to the heater.
When a number of heaters are to be wired as part of a single instal-
lation, each heater must be provided with a separate isolator.
Electrical supply entrance is on the rear of the heater. The final con-
nection to the heater should be to the appliance terminal block in the
heater electrical box. See the connection diagram in Paragraph 9.1.
Supply cable size should be 1.0 mm for a model equipped with an
axial fan. Larger cable may be required for heaters with a centrifugal
blower. See Section 2, Technical Data, for required fuse size.
Fit the cord anchor supplied with the heater. The length of the con-
ductors between the cord anchorage and the terminals must be such
that the current-carrying conductors become taut before the earthing
conductor, if the cable or cord slips out of the cord anchorage.
TABLE 11 - NET WEIGHT OF HEATERS (approximate)
Model with Size
following type of
Air Delivery
Equ i pm e n t 75 100 125 150
175 200
225 250
300 350 355
400
With Axial Fan kg 80 86 93 118 146 166 191
With Blower kg 90 90 115 134 145 175 195 221
With Blower
and Cabinet kg 106 106 134 151 160 206 213 251
