6.5 Pressure Switch Servicing
1. Isolate the heater power and gas supply from the unit.
2. Tap into the pressure switch line with a PVC T-Piece with a suitable manometer.
3. Check that the pressure switch is opening within the limits specified below as follows:
4. Measure the vacuum pressure and make sure the vent hole and bleed hole are clear
of any foreign material.
5. Make sure the hoses are free of condensation.
6. Check the hoses leading to the pressure switch are clear of foreign material
7. Reassemble.
Unit Pressure switch (Opens)
BX315 115pa
BX320 80pa
BX326 50pa
6.6 Main Fan Assembly Servicing
Internal Models
1. Turn the unit OFF and isolate the power supply.
2. Remove the panel on the fan compartment gas entry side of the heating unit so there
is access to the fan motor assembly.
3. Remove fan housing from cabinet.
4. Remove fan assembly from housing.
5. Clean impellor and motor.
6. Clean housing.
7. Reassemble.
8. Check all wiring cables and plug connections.
Installation is a reversal of the removal procedure.
Bleed Hole
(0.4 mm)
Vent Hole
(2.3 mm)
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