0108RPVDGBEN
9
Figure 6. Air handler application recommendations when elbows are
used at appliance connection
Elbow with turning vanes from below
Square heel elbow from below
Round heel elbow from below
GOOD
BAD
BAD
Elbow with turning vanes from the side
Square heel elbow from the side
Round heel elbow from the side
GOOD
BAD
BAD
SECTION 4. GAS CONNECTION
4.1
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.
4.2
Check that the gas category is in accordance with
the data described on the air heater.
4.3
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.
4.4
A 90
°
action gas service tap and, to facilitate
servicing, a disconnect union fitting must be
provided adjacent to the appliance, see fig. 8.
4.5
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 7.
Gas connection detail
WARNING: NEVER use a FLAME to test for GAS Soundness !!!
