HEATED PASS THROUGH
INSTALLATION, OPERATION, SERVICE, AND PARTS
G.Disconnect the plate ground wire from the
H.Using a thin, sharp knife inserted between the plate and the HPT chassis, carefully cut the silicon adhesive between the plate and the sides of the chassis.
I.Pry up one end of the plate, lifting it away from the chassis. NOTE: The plate is held in place by acrylic tape and it will be difficult to break the bond between the plate and the chassis.
J.Remove the acrylic tape from the frame to prevent rebounding while servicing the unit.
K.Remove the three screws in the air heater shield and remove the shield to expose the heater.
L.Disconnect the air heater leads from terminal J2 on the controller board and from the solid state relay (see Wiring Diagram on Page 7), and lift the heater from its bracket.
M.Install the replacement heater and connect the leads to terminal J2 on the controller board and to the lower left terminal of the solid state relay.
N.Apply new acrylic tape to the HPT chassis, then stand the plate on its edge against the blower side of the unit.
O.Once the plate is properly aligned with the chassis, gently lower it into place.
P.Reconnect the plate ground wire to the
Q.Inspect the gaskets on the bottom of the cowl assembly and air tower assembly for damage. If necessary, remove the old gasket material, clean the surfaces thoroughly, and apply new gaskets.
R.Slip the slotted brackets on the front section of the air tower assembly up and under the nuts on the tower mounting screws. Push inward and down to ensure that the front section is properly seated.
S.Check for gaps in the seal between the front section of the air tower assembly and the plate. If a gap is present, remove the front section and apply a second gasket over the one already in place and reseat the front section.
T.Once the front section is properly positioned and seated, tighten the nuts on the mounting studs to pull it flush against the back of the tower assembly.
U.Carefully lower the cowl into position and check for a proper seal between the cowl and the plate. Install another gasket over the one already in place if there are gaps between the base of the cowl and the plate.
V.Carefully turn the unit on its side and reinstall the five screws removed in Step B.
W.After the cowl is in place, reseal around the edges of the plate with RTV #108 silicone rubber compound, P/N
6.4Replacing the Blower Assembly
A.Disconnect the unit from the electrical power source.
B.Remove the cowl, front section of the air tower, and the plate from the unit per Steps B through J in procedure 6.3 above.
C.Remove the four
D.Remove the four
E.Lay a piece of cardboard on the plate to prevent scratching it, then lift the blower assembly out of the unit and set it on the plate.
5
