12
5.0 Commissioning the Appliance
5.1
Commissioning the Appliance
1. Turn on the gas service cock.
2. Where applicable, fit the control knob onto the
control tap spindle (Fig. 12).
3. Purge any air from the system.
4. Non Comfortstat models - Remove the
pressure test point screw.
Comfortstat models - Loosen the pressure test
point screw.
Fit a pressure gauge to the pressure test point
(Fig. 12).
5. Push the control knob in and turn
anticlockwise to the ignition ( ) / ( ) position.
The main burner should light. Keep the control
knob pushed in for 20 seconds. If the burner fails
to remain alight repeat the procedure. Check that
the gas supply is correct by measuring the
pressure at the test point on the gas control tap.
6. No adjustment is provided on the appliance. If
it is found that the test pressure is not within the
tolerances given, consult the gas supplier.
7. Push in and turn the control knob back to the
OFF ( ) position. Remove pressure gauge and
replace the pressure test point screw.
8. Relight the appliance and check for gas
soundness.
5.2
Fitting the Outer Case
Before fitting the case it is important that the
details on the last page of this guide are
completed.
1. Push in and turn the control knob back to the
OFF ( ) position.
2. On models not fitted with the Comfortstat
control, remove the knob from the appliance by
gently pulling the knob forward (Fig. 12).
3. Fit the outer case by locating the slots in the
outer case rear strip onto the four mounting lugs
on the wall brackets (Fig. 14).
4. Where applicable, replace the control knob
(Fig. 14).
5.3
Instructing the User
1. Explain how to ignite the appliance and alter
the heat settings.
2. Show the position of the external gas service
cock.
3. Instruct the user that the bottom and top of the
case must never be obstructed in any way and
emphasise that clothes etc must never be hung
over the appliance to dry as this will cause
overheating and possible damage.
4. Hand over this guide and recommend that for
reasons of safety and economy the appliance
should be serviced annually by a competent
person.
L.P.G. Setting Pressure
(Cold/High Rate)
F5 & F5S
F8S
36.5 ± 1mbar
36.5 ± 1mbar
(14.6 ± 0.4in wg)
(14.6 ± 0.4in wg)
N.G. Setting Pressure
(Cold/High Rate)
F5 & F5S
F8S
19.7 ± 0.75mbar
19.25 ± 0.75mbar
(7.9 ± 0.3in wg)
(7.7 ± 0.3in wg)
F8ST Comfortstat 2
20.00 ± 1.0mbar
(8.0 ± 0.4in wg)
Control Knob
Pressure Test Point
Viewing Window
Mounting Lugs
Fig. 12
Fig. 13
Fig. 14
Igniter removed
for clarity
Installer Guide
Comfortstat models only
Pressure Test Point
at front marked
© Baxi Heating U.K. Limited 2010.
