Does the
amber light
remain illuminated
after several
minutes?
NO
YES
Does the burner
attempt to relight within
5 minutes?
YES
CHECK: -
1. Clear ignition controller lock-out state.
2. External time clocks / thermostats.
3. Hose connection to vacuum switch.
4. Check correct combustion fan fitted / HB damper pressure set.
5. Check vacuum at test point in burner (see table for pressures).
6. Check turbulator arrangement / lengths.
7. Air inlet, outlet, and emitter tubes for obstructions.
CHECK: -
1. Check correct combustion fan fitted / HB damper
pressure set.
2. Check vacuum at test point in burner (see table for
pressures).
3. Inspect tube joints and couplers for air leaks.
4. Check turbulator arrangement / lengths.
5. Seals and gaskets on forced burners.
YES
YES
YES
NO
Pressure Switch Operating Pressures mbar (“WG)
Part Number
Colour
Minimum HOT
Working Pressure
2192-2-PTU
Grey
201508
Green
201676
Red
0.98 (0.39)
0.50 (0.20)
0.75 (0.30)
Page 2
END
If the heater still fails to operate
correctly, contact your local
representative.
201697
Brown
1.60 (0.64)
201932
Yellow
2.74 (1.10)
L104039
Orange
3.40 (1.36)
Negative
Positive
STEP 2
Remove the two screws as shown below.
The air pressure switch can now be removed.
STEP 3
Fit the new air pressure switch ensuring the
impulse tubes are connected the correct way
around (vacuum to the left and positive to the
right as shown in the photo). Test product and
close access doors.
Electrical cables are connected as follows:
• Grey = Terminal 1, COM
• Black = Terminal 2, NC
• Yellow = Terminal 3, NO
STEP 2
Disconnect the HT Lead from burner controller.
STEP 3
Remove the two screws attaching the controller
to the burner and remove. Refit HT leads and
refit burner controller to wiring harness.
Test product and close access door.
7.
Replacement parts (all models)
7.1 Air Pressure Switch Replacement
STEP 1
Slacken screw in burner lid and open the left
hand burner access door.
Disconnect the two silicone impulse tubes,
noting which way round they connect to the
pressure switch. Disconnect the three electrical
cables from the pressure switch.
7.2 Burner Control Replacement (SIT
sigma gas valve)
STEP 1
Slacken screw in burner lid and open the right
hand burner access door. Disconnect burner
controller from the wiring harness.
52
Summary of Contents for VS15LHE8
Page 34: ...A Figure 41 Vision Heater Assembly Models VSUTE VSUHE 15kW 76mm 3ins Nom Dia 34...
Page 35: ...A A Figure 42 Vision Heater Assembly Models VSUTE VSUHE 20 25kW 76mm 3ins Nom Dia 35...
Page 36: ...Figure 43 Vision Heater Assembly Models VSUTE VSUHE 30 35kW 100mm 4ins Nom Dia 36...
Page 37: ...Figure 44 Vision Heater Assembly Models VSUTE VSUHE 40kW 100mm 4ins Nom Dia 37...
Page 38: ...Figure 45 Vision Heater Assembly Models VSUTE VSUHE 45 50kW 100mm 4ins Nom Dia 38...
Page 39: ...A Figure 46 Vision Heater Assembly Models VSLIE VSLHE VSDLE 15 25kW 8m 76mm 3ins Nom Dia 39...
Page 40: ...A Figure 47 Vision Heater Assembly Models VSLIE VSLHE VSDLE 20 25kW 10 5m 76mm 3ins Nom Dia 40...
Page 41: ...Figure 48 Vision Heater Assembly Models VSLIE VSLHE VSDLE 30 35kW 10 5m 100mm 4ins Nom Dia 41...
Page 43: ...Figure 50 Vision Heater Assy Models VSLIE VSLHE VSDLE 35 40 45 50 kW 16m 100mm 4ins Nom Dia 43...
Page 59: ...Notes 59...
