Glow-worm Miami 4 - Manual (Page 13)

13 221904D
6 Control & Pressure Checks
GAS TAP
PRESSURE
TEST POINT
Diagram 6.1
9477
6.1 Check Control Settings
If closed, open the fire isolating valve.
To check the control positions temporarily place the case
loosely over the chassis. Fit the control knob over the gas tap
spindle.
Depress the control knob and turn anticlockwise partially towards
the 1/IGN position until some resistance is felt. Keep depressed
at this position for a few seconds to purge air from the system
then, while keeping it depressed, turn fully to the 1/IGN position,
two audible clicks will be heard. A spark should be generated at
the pilot while turning. The spark should ignite the pilot.
When pilot ignition has been achieved, keep the control knob
depressed for approximately ten seconds to allow the
thermocouple probe to warm up and then release it. If the pilot
does not remain alight, ensure that the air has been purged, that
the pilot orifice is clear and that the thermocouple connections
are sound. Replace the pilot unit if necessary (see servicing
section of this manual).
Check all the control settings. These are:
Knob Radiants Condition
Position
2 Centre radiant on low. Outer radiants off.
3 Centre radiant fully on. Outer radiants off.
4 Centre radiant fully on. Outer radiants on low.
5 All radiants fully on.
6.2 Flame Supervision Device
The pilot unit incorporates a system which will automatically
shut off the gas supply if the pilot flame goes out or if there is
insufficient oxygen due to spillage or lack of ventilation.
Check that the system operates properly as follows;
Light the appliance. Set at position 5 and leave for one minute.
Turn back to “OFF” to extinguish the pilot. Note the time when
the pilot goes out. Listen for a snap sound at the gas tap. Note
the time when the sound is heard. This sound is caused by an
electromagnetic valve shutting off the gas supply through the
tap. The valve is located in the body of the tap. The valve should
operate within 60 seconds of the pilot going out. If the valve does
not operate within this time limit do not allow the appliance to be
used until the fault has been corrected.
6.3 Flue Blockage Safety Device
This monitoring system must not be adjusted, bypassed or put
out of operation.
This monitoring system, or any of its parts, must only be
exchanged using Glow-worm authorised parts.
6.4 Check Reference Pressure
The appliance is pre-set to give the correct heat input at the inlet
pressure shown in section 1 of this manual. No adjustment is
necessary.
Detach the control knob from the spindle. Remove the case.
Check the burner pressure by fitting a pressure gauge at the test
point. The test point is on the gas tap, see diagram 6.1. Check
the pressure with the appliance alight and set at maximum
output (Control position 5).
After checking, turn off the appliance. Remove the pressure
gauge and replace the test point sealing screw. Relight the
appliance. Turn to the maximum output position and test around
the sealing screw for gas soundness with a suitable leak
detection fluid.
If all the above checks are satisfactory, continue with the
installation. If not, check the control and ignition circuitry and
components as described in the servicing section of this manual.
6.5 Case Fitting
Remove the protective wood transit strips (secured with panel
pins) from the bottom of the wooden case sides.
Place the case over the chassis. Make sure that the channel
near the top of the rear of the outer case locates fully into the
wings of the chassis back panel, see diagram 6.2.
Fit the control knob firmly on to the control spindle.
Refit the two case retaining screws at the front of the case near
the bottom corners.
Diagram 6.2
9476
BACK PANEL
WING (2)
CHASSIS
BACK PANEL