Vulcan-Hart 3-130, Service Manual

Page: 41 / 48

8 – 7
SECTION 8 - DISASSEMBLY/REASSEMBLY
8.8 HEATING PLATES
TOOLS:
Phillips head screwdriver
Small putty knife
Note: Like the headlights on a car, if one heating
plate burns out, the other will likely burn out soon.
Therefore, it would be advisable to replace both
plates at once.
WARNING:
Disconnect power from the wall outlet before
attempting to service the furnace!
8.8.1 Follow steps 8.1.1 - 8.1.2 of CONTROL DRAWER
REMOVAL.
8.8.1: Disconnect muffle wires from plate(s) to be
replaced. (refer to wiring diagram 2.9 for A-Control and
5.9 for 3-stage control.)
8.8.2: Remove floor tray
8.8.3: Pull out bad plate(s) (Rotate bottom of plate
toward center of muffle). Be careful when pulling leads
thru holes in muffle.
8.8.4: Replace with new plate(s). There are brass
bushings located in the heatshield below the muffle
holes. Cut tie wraps located on terminals' insulation.
Slide the piece of insulating sleeve (provided) over the
existing ones and tie wrap at 1" below the heat shield. It
may take a few attempts to locate this hole with the
muffle terminal
8.8.5: Optional: a syringe of ceramic adhesive is
provided to hold plates secure to sides. Stuff newspaper
in muffle until adhesive sets (1 hr). There will be some
movement of the plates without the adhesive.
8.8.6: Connect muffle wires from plate(s) to control PCB.
Refer to wiring diagram 2.8 for A-Control or 5.9 for 3 stage
control. (See step 8.8.1)
8.8.7: Install floor tray
8.8.8: Install control drawer by reversing steps 8.1.1 -
8.8.5
A-CONTROL
(130, 550) 100, 120V HOOK UP
(1750) 230V
(130, 550)
230V HOOK UP
3-STAGE
(130, 550) 100, 120V MUFFLE
WIRING (1750), 230V
(130, 550) 230V
MUFFLE WIRING
Black marked
lead
Black marked
lead
TAN
P1 P6
P1 P6
TAN W/BLK MARK
Brake bond with
putty knife
rotate in
feed wires thru
bushings (one wire
per bushing)
Apply white adhesive
(optional)