44
3.2
Balancing The Herringbone System
Important When all the heaters have been
installed the vacuum settings must be
finally balanced in the hot condition.
Before attempting to start up the heating
system it is essential to perform the preliminary
balancing of the vacuum level at each burner
unit. Isolate each heater unit by unplugging the
electrical connector and closing the gas
isolating valve.
Start all burners up and allow them to
run for at least 20 minutes. Adjust the
damper at exit of each heater using a
4mm Allen key in the damper blade
securing screw. Observing the vacuum
reading using a ‘U’ tube manometer
connected to the vacuum test point (see
fig29) each damper should be readjusted
and set at a hot condition reading as shown
in table 9 (NG) and table 10 (LPG) for the
appropriate size of heater and model.
Figure 29. HB Damper Assembly
3. Commissioning
Instructions.
These appliances should be commissioned by a qualified engineer.
3.1 Tools
Required.
The following tools and equipment are
advisable to complete the tasks laid out in this
manual.
Suitable alternative tools may be used.
3.3
Balancing a DL System
Important When all the heaters have been
installed the vacuum settings must be
finally balanced in the hot condition.
As with a Herringbone system above, start both
burners up and allow them to run for at least 20
minutes. Adjust the damper on the condensate
box using a 4mm Allen key in the damper blade
securing screw. Observing the vacuum reading
using a manometer connected to the vacuum
test point (see figure 30) each damper should
be readjusted and set at a hot condition reading
as shown in table 9 (NG) and table 10 (LPG) for
the appropriate size of heater and model.
Damper blade
Vacuum
test point
Figure 30. DL Condensate Box Assembly
Small Flat
Head
Screwdriver
Manometer
Pozidrive
Screwdriver
Leather
Faced
Gloves
4mm
Allen
Key
12mm
Spanner
Large Adjustable
Spanners or 22, 26 &
27mm Spanners for
fitting Of Gas Flex.
13mm
Socket
Wrench with
Extension
Ref
Description
A
Radiant Emitter Tube
B
Manifold Tube
C
Vacuum Test Point
D
Damper Blade
D
A
C
B