4.Disconnect wires from rollout switch.
5.Remove manifold or burner/manifold assembly. Manifold ONLY
a.Remove the No. 10 screws that secure the manifold pipe to both legs of the manifold
assembly. The manifold pipe must be supported during this step, or it could fall and damage the furnace or cause bodily injury!
b.Slide the manifold pipe (with valve and orifice) forward, out of the furnace.
Burner/Manifold Assembly
a.Remove the No. 10 screws that secure the burner/manifold assembly legs to the furnace.
The manifold pipe must be supported during this step, or it could fall and damage the furnace or cause bodily injury!
b.Slide the burner/manifold assembly forward, out of the furnace until the assembly is clear of the manifold retention pins.
c.Rotate the assembly slightly, in order for the legs to clear the sides of the cabinet, and remove through the front of the furnace.
8.To reinstall the manifold pipe or burner/manifold assembly, reverse the above steps.
Blower Removal/Replacement:
Removal
1.Turn OFF all electrical power to the furnace.
2.Remove the control box access panel and blower access panel.
3.Unplug wires from the blower assembly to the control box.
4.Remove the four (4) screws securing the control box in the unit (two (2) in the cabinet at the sides of the blower door opening and two (2) at the top rear of the control box). Be sure to support the control box so that it does not fall!
5.Rotate the control box out of the cabinet and support it so that no strain is placed on any wiring. It may be necessary to disconnect the electrical supply and thermostat wiring from the control board.
6.Remove the blower retaining screws from the front of each blower leg (See Figure 18). These are the two
(2)screws located in the blower compartment that secure the blower legs to the blower partition panel.
7.Slide the blower forward about two (2) inches. This will disengage the rear of the blower legs from the blower partition. Rotate the front of the blower down to clear the control box mounting tabs on the underside of the blower partition, and continue sliding the blower forward until it is out of the unit. Take care to clear the control box mounting tabs. If necessary, disconnect the auxiliary limit leads on the sides of the blower housing.
Replacement
1.Place the blower in the blower opening of the unit and reconnect the auxiliary limit leads.
2.Slide the blower back, into the unit, taking care to clear the control box mounting tabs.
3.When the blower is about halfway into the cabinet, rotate the rear of the blower UP so that the rear of the blower legs engage the side rails in the blower partition.
4.Continue sliding the blower into the unit until the front of the blower housing is behind the control box mounting tabs. Rotate the front of the blower UP until the legs lie flat against the bottom of the blower partition, then slide blower fully into position. The rear of the blower should be against the stop in the partition and the rear of the blower legs should be under the partition.
5.Reattach the two (2) blower securing screws, the control box, any disconnected wiring, the blower access panel, and the control box access panel.
Lubricating Motors:
Direct drive motor and blower assemblies are factory lubricated and normally do not require oiling. If oiling is required lubrication of the blower motor is to be preformed only by a qualified service agency.
Figure 18
BLOWER REMOVAL AND REPLACEMENT
20571201 | Issue 0527 | Page 25 of 28 |