York P3DHX12F08001 P4LBX20F19001 Assembly Notes, P3DHX Series Downflow Configuration Notes

Table C-3: System and General Troubleshooting continued

Problem			Possible Cause	Remedy
			Airflow blocked or dirty air fil-	Clean or replace air filter.
			ter.
Supply	air	temperature
				Check all dampers. Open closed dampers including registers in
too hot.			Insufficient airflow.
				unused rooms. Check system temperature rise. If temperature
				rise is too high, speed up blower fan.
			Excess airflow.	Check system temperature rise. Slow down blower fan if neces-
Supply	air	temperature		sary.
too cool.			Excessive duct losses.	Check supply air ductwork. Seal leaky joints and seams. Insu-
				late ductwork if necessary.
				Increase differential between fan control "fan off" and "fan on"
Supply	air	temperature	Fan control "fan on" setting too	settings. (L4064B, L6064A fan / limit controls only, no adjust-
			low.	ments available for L4064W fan / limit control). Register air de-
too cool	during first mo-			flectors may help.
ments of furnace cycle.
			Excessive duct losses.	Check supply air ductwork. Seal leaky joints and seams. Insu-
				late ductwork if necessary.

P4LBX20F19001 ASSEMBLY NOTES

The P4LBX20F19001 oil-fired furnace is shipped in two pieces; the furnace sec- tion and the blower section. These two sections must be assembled together at the installation site.

1.Remove the crating and packaging materials from each section. Re- move the flue pipe flange gasket packed with the furnace section. The flue pipe gasket will be lying loose on the floor of the furnace sec- tion.

2.Remove the shipping brace from the furnace section flue pipe flange and cabinet. Remove and save all of the screws from the flue pipe flange, and the ten screws from the rear edges of the furnace section cabi- net, (5 per side). The screws will be re-used.

3.Place the furnace section and blower section in close proximity. Route the wiring harness from the base of the furnace section through the plastic grommet in the blower section blower division panel.

4.Position and align the flue pipe flange gasket between the furnace section and blower section flue pipe flanges, and hold it in place with a pair of awls or similar tool.

5.Begin fastening the flue pipe flanges together from inside the blower sec- tion to the furnace section with the

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six ¼-20 x ¾ inch screws saved from the removal of the shipping brace. Start each screw carefully so as not to damage the flue pipe flange gasket. After all six screws have been started, and proper gas- ket alignment has been confirmed, tighten all six screws evenly.

6.Align the screw holes in the blower section blower division panel with the screw holes in the furnace sec- tion cabinet rear edge, from which the ten screws were removed. The screws are started from the inside of the blower section to the furnace section. Tighten all ten screws evenly.

7.In a similar manner, start four of the extra screws removed and saved from the furnace section flue pipe flange into the screw holes along the top of the two furnace sections.

8.Remove the blower motor electric wiring cover plate. Connect the black lead from the wiring harness to motor terminal L1, the white lead to motor terminal L2, and the green lead to the motor casing ground terminal. Position the wires in the motor casing indentations and re- install the blower motor electric wir- ing cover plate.

P3DHX SERIES DOWNFLOW CONFIGURATION NOTES

When the P3DHX12F08001 or P2DHX16F12001 are installed in the downflow configuration on a wooden floor, it should be mounted on a sub- base.

The sub-base provides a means of main- taining the supply air plenum clearance to combustibles, and a means of mating the supply air plenum to the furnace.

Model	Sub-base
P3DHX12F08001	1CB1312
P2DHX16F12001	1CB0316

If the furnace is to be installed on a wood floor over joists on 12 inch or 16 inch centers, framing modifications are nec- essary.

Rough Size Openings:

P3DHX12F08001: 21” x 21”.

P2DHX16F12001: 22½” x 22½”.

The edges of the rough size opening must be well supported by the joist fram- ing to take the weight of the furnace.

The sub-base may support the supply air plenum. Fold a ¾ inch, 90° flange, then drop the supply air plenum through the sub-base opening. The flanges will rest on the sub-base, and the furnace placed on the flange will lock the plenum into place.