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"G" Heat exchanger Module
The GRE "G" unit is a self contained, compact, atmospheric gas fired heat exchanger
module incorporating a clam type constructed folded and welded heat exchanger
with aluzink casing, and air tight compartment for the burner.
- Models 18 to 49 have 80mm air inlet and flue outlet collars
- Models 55 to 104 have 100mm air inlet and flue outlet collars
The "G" module has an integral flue fan which induces air into the unit
and clears away the products of combustion. The excess air mix is such
that the flue gas leaving temperature is no more than 120°C and single
skin flue is generally suitable. The air inlet and flue outlet ends need
to be in an equal atmospheric pressure zone which is best achieved with
them in proximity of each other, similar to a typical flue dilution application.
The module has an integral flue fan proving switch which sequences ignition
after the fan has been established as working.
Where the module is fitted within an externally mounted Air Handling Unit,
ideal flue conditions are achieved with either the fitting of one of the flue
kit options described in the brochure or with a pair of pipes terminating with
approved terminals at staggered heights above the unit.
For internally mounted Air Handling Units or stand alone modules. The
flue connection to the atmosphere with extended pipes available as kit
C with the application of a horizontal or vertical "combi" pipe is ideal.
Alternatively individual pipes terminating with approved terminals can
be used. Once again the proximity of the flue outlet and air inlet terminal
is important for balanced conditions.
The "combi" pipes shown as kits A,B,E,F & G can easily be cut to length to
suit and the vertical units incorporate an outer sheath which can be cut to suit
the storm collar supplied to make a weatherproof roof penetration. All the flue
components are aluminium except for the high temperature plastic "connecting boot"
which brings both pipes together for entry into the "combi" pipe.
Maximum Flue & Air pipe runs
| Models 18 to 98 |
Flue run of 6 meters with two bends in each pipe (12m combined) |
| Model 104 |
Flue run of 3 meters with two bends in each pipe (6m combined) |
If the runs need to be longer than the specified maximums, the diameter
of the piping should be the next size up. For example: 80mm piping should
be increased to 100mm and 100mm up to 130mm for runs of up to 12m (24m
combined) on all appliances.
Flue Kits for Module type GT
| Flue Kit A |
Vertical venting through roof of Air Handling Unit, or, with kits C & D vertical
internal flue run to roof penetration. |
| Flue Kit B |
Top flue/air collars with side discharge through Air Handling unit (either
direction) or, with kits C & D, horizontal flue run to "through wall" outlet. |
Flue Kits for Module type GR
| Flue Kit E |
Rear flue/air collars with options as kit B above. |
| Flue Kits F & G |
Rear flue/air collars with options for left, centre or right for applications
as A above. |
Contents:
- Explanation of Heat Exchanger Modules
- Control Application Notes
- Flue Application Notes
- Pulse Combustion Control
- Mod 1 Combustion Control
Return to the main Applications Index
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