9801ST00AMEN
11
SECTION 5. GAS CONNECTION
5.1
Connection to a gas service may only be carried by
suitably qualified persons. The gas installation must
comply with the rules in force using materials
appropriate for gas service installations.
5.2
Check that the gas category is in accordance with
the data described on the air heater.
5.3 An adequate gas supply sized to provide the
dynamic pressure for the volume required by the air
heater(s) is essential to maintain the nominal heat
input.
5.4 A
90
°
action gas service tap and, to facilitate
servicing, a disconnect union fitting must be provided
adjacent to the appliance, see fig. 8.
5.5
Ensure that a gas service includes a filter and has
been tested and purged in accordance with
prescribed practice prior to commissioning and
taking the air heater into service.
Figure 8 : Gas connection detail
WARNING: NEVER use a FLAME to test for GAS
Soundness !!!
SECTION 6. ELECTRICAL CONNECTION
6.1
The Electrical installation may only be carried out by
suitably qualified persons observing the rules in force.
6.2
Check that the electrical specification is in accordance
with the specified data on the air heater. A unique
appliance wiring diagram is supplied as a separate
document attached to this one plus a copy attached to
the air heater
6.3
These
appliances
must
be earthed.
6.4
A separate electrical isolator for each heater must be
provided adjacent to the appliance. The isolator must
have a contact separation of at least 3.0 mm on all
poles.
6.5
Ancillary controls are required to provide timed heat
cycles, room comfort temperature level, frost
protection, override air circulation etc. These are not
included with the appliance and should be ordered
separately.
6.6
Ensure when planning the external appliance control
circuitry, that power will be supplied at all times to the
air heater, even when it is control switched in the
'heat-off' mode. This is necessary to ensure that the
fan can operate independent of the heating control.
Therefore,
Never
incorporate automatic controls that
electrically isolate the appliance. This is also important
when the appliance is installed into an air handling
appliance.
NOTE:
ST AIR HEATERS ARE SUPPLIED WITH EXTERNAL CONTROL CIRCUITS BRIDGED. THE AIR HEATER/S WILL
OPERATE CONTINUOUSLY UNLESS THESE ARE REMOVED AND TIME AND TEMPERATURE CONTROLS
SUBSTITUTED FOR THEM
