Vulcan-Hart 3-130, Service Manual

Page: 43 / 48

8 – 9
SECTION 8 - DISASSEMBLY/REASSEMBLY
8.9.11: Front panel must insert into offset bracket in
wraparound
8.9.12: Check muffle resistance to verify wiring is
correct before securing control drawer:
100V 120V 200-240V
A-130, 3-130 11.5 ohms 11.5 ohms 32 ohms
A-550, 3-550 8 ohms 8 ohms 24 ohms
A-1750, 3-1750 12 ohms
8.10 THERMOCOUPLE (A-CONTROL)
TOOLS: bladed screwdriver phillips head screwdriver, 3/8"
nutdriver, wrench, 1/4" nutdriver
WARNING:
Disconnect power from the wall outlet
before attempting to service the furnace!
8.10.1: Follow steps 8.1.1 - 8.1.2 of control drawer removal
8.10.2: Follow steps 8.9.3 - 8.9.7 from previous page for
muffle replacement for furnaces without a rear access panel.
Note: All 1750 furnaces and all furnaces with S/N date codes
after 9701 will have rear access panel so that muffle will not
need to be removed to service thermocouple (see step
8.11.6 for details).
8.10.3: Disconnect thermocouple from pyrometer
8.10.4:
Remove nut. Replace thermocouple by reversing
previous steps and replace nut.
8.11 THERMOCOUPLE (3 STAGE CONTROL)
TOOLS:
bladed screwdriver
phillips head screwdriver
1/4" nutdriver
WARNING:
Disconnect power from the wall outlet
before attempting to service the furnace!
8.11.1: Follow steps 8.1.1 - 8.1.2 of control drawer removal
8.11.2: Follow steps 8.9.3 - 8.9.7 from previous page for
muffle replacement for furnaces without a rear access panel.
Note: All 1750 furnaces and all furnaces with S/N date codes
after 9701 will have rear access panel so that muffle will not
need to be removed to service thermocouple (see step
8.11.6 for details).
8.11.3: Remove nut which holds thermocouple to
control drawer.
8.11.4: Disconnect thermocouple from circuit board
8.11.5: Replace with new thermocouple by reversing previous
steps 8.11.1 thru 8.11.4
bracket
Wraparound
Front Panel
Pyrometer
Red from PCB
Top
View
Yellow from PCB
Yellow from Muffle
Red from Muffle
7.8 Fig. G
remove and replace nut
red
yel
red
yel
meter
remove nut