Dover unified brands groen DH-20, Operator'S Manual, Page: 13 / 30

13 OM-DH(T) DOMESTIC & (CE) INTERNATIONAL
3. Withdraw the On/Off switch.
4. Replace in reverse order.
REMOVAL OF LAMPS
Turn gas and electricity mains off
1. Remove cabinet side panel as described in REMOVAL OF CONTROL CABINET
PANELS.
2. Disconnect the lamps flying leads.
3. Undo and remove the retaining collar.
4. Remove the 2 nuts retaining the light mount and spacer.
5. Withdraw the lamp from the control compartment.
6. Replace in reverse order.
REMOVAL OF CLASSIC/ADVANCED CONTROLLER
Turn gas and electricity mains off
To Replace:
1. Remove cabinet side panels as described in REMOVAL OF CONTROL
CABINET PANELS.
2. Remove 4 nuts retaining controller.
3. Remove electrical leads from controller.
4. Loose control dial set screw and remove dial.
5. Remove controller.
6. Replace in reverse order.
To Calibrate:
(classic controls only, if required)
1. Fill the pan with unused oil to the indicated mark. Place a thermocouple 25
mm below the oil surface in the middle of the pan.
2. Light the unit and allow the oil to heat.
3. Temperature should settle at 374ºF(±9ºF), 190ºC (±5ºC). If adjustment is
required, disconnect main power. Adjustment is located on the back of the
control board. Turn adjustment counter-clockwise to increase temperature
and clockwise to decrease.
REMOVAL OF PRESSURE SWITCH (TURN THE GAS & ELECTRICITY MAINS OFF)
Water Level
Sensor
Pressure Switch
1. Remove panel from base of kettle by undoing the retaining screws.
2. Disconnect the electrical leads from the pressure switch.
3. Drain kettle by tilting kettle slightly and undoing the compression fitting at
the pressure switch. Allow kettle to drain into a suitably sized container.
4. Remove and withdraw the pressure switch from the kettle base by undoing
the compression fitting.
5. Replace in reverse order.
6. Once the pressure switch is in place, the kettle jacket should be refilled.
Always refer to wiring diagram when reconnecting electrical leads.
REMOVAL OF LOW WATER LEVEL SENSOR (TURN GAS & ELECTRICITY MAINS
OFF)
1. Remove panel from base of kettle by undoing the retaining screws.
2. Disconnect the electrical leads from the water sensor.
3. Drain the kettle by tilting it slightly and undoing the low water level sensor.
Allow the kettle to drain into a suitably sized container.
4. Remove the low water sensor from the kettle base.
5. Replace in reverse order.
6. Ensure a suitable sealant is used to seal the low water level sensor Boss.
7. When the low water level sensor is in place, the jacket should be filled.
REMOVAL OF BURNERS (TURN THE GAS & ELECTRICITY MAINS OFF)
1. Remove water splash guards around the burner.
2. Undo compression fitting at gas pipe to burner manifold and to the pilot.
3. Disconnect electrical leads to the pilot.
4. Remove the four retaining nuts securing the burner and igniter assembly
to the combustion chamber. Carefully support the weight of the burner
manifold and lower the assembly to a safe position.
5. The burners are now accessible and can be removed as required. Ensure
adequate sealant is used to seal the burners.
6. Replace in reverse order. Always check for gas soundness when any part of
the gas circuit has been disturbed.
REMOVAL OF PILOT (TURN THE GAS & ELECTRICITY MAINS OFF)
1. Remove water splash guards around the burner.
2. Disconnect the high voltage spark cable from the pilot.
3. Disconnect the ground connection cable from the pilot mounting screw.
4. Remove the second pilot mounting screw.
5. Remove pilot assembly and install new pilot.
6. Replace in reverse order.
7. Ensure that there is an adequate spark at the sparking electrode and that
the burners light smoothly and without delay.
8. As the burners ignite, ensure that the sparking sequence stops and that the
burners remain lit.
High Voltage
Spark Cable
Pilot
Ground
Connector
Burner
Gas Line Gas Line
OM-SM-DH-CE
17
OM/SM-DH-CE
Recommended spacings are shown in this drawing.
DH-20 shown
g) Ensure that there is an adequate spark at
the sparking electrode and that the burners
light smoothly and without delay.
h) As the burners ignite, ensure that the
sparking sequence stops and that the
burners remain lit.
3.17 Removal of Pressure Gauge (Turn the
gas and electricity mains off)
a) Using the correctly sized spanner remove
the pressure gauge from top of the sight
glass.
b) Replace with new pressure gauge ensuring
that an adequate sealing compound is used.
c) Once the pressure gauge has been
replaced, the kettle jacket will require
venting. (Para 3.2)
3.18 Removal of Sight Glass (Turn the gas
and electricity mains off)
a) Remove sight glass protection bars.
b) Undo top and bottom compression fittings.
c) Allow the water in the sight glass to drain.
d) Remove the sight glass.
e) Replace in reverse order.
15 mm
13 mm
OM-SM-DH-CE
17
OM/SM-DH-CE
Recommended spacings are shown in this drawing.
DH-20 shown
g) Ensure that there is an adequate spark at
the sparking electrode and that the burners
light smoothly and without delay.
h) As the burners ignite, ensure that the
sparking sequence stops and that the
burners remain lit.
3.17 Removal of Pressure Gauge (Turn the
gas and electricity mains off)
a) Using the correctly sized spanner remove
the pressure gauge from top of the sight
glass.
b) Replace with new pressure gauge ensuring
that an adequate sealing compound is used.
c) Once the pressure gauge has been
replaced, the kettle jacket will require
venting. (Para 3.2)
3.18 Removal of Sight Glass (Turn the gas
and electricity mains off)
a) Remove sight glass protection bars.
b) Undo top and bottom compression fittings.
c) Allow the water in the sight glass to drain.
d) Remove the sight glass.
e) Replace in reverse order.
15 mm
13 mm
Recommended spacings are shown in the above drawing.
REMOVAL OF PRESSURE GAUGE (TURN THE GAS & ELECTRICITY MAINS OFF)
1. Using the correctly sized spanner remove the pressure gauge from top of the
sight glass.