Electrical Wiring - Williams 4007332 Owner's Manual

Installing Your Furnace
The following rules apply:
1. Use new, properly reamed pipe free from metal chips and
debris such as steel or black iron pipe. Use fittings approved
by local codes.
2. Do not thread pipe too far. Valve distortion or malfunction may
result from excess pipe within control. Apply moderate amount
of good quality dope to the pipe threads only, leaving 2 end
threads bare. If LP Gas installation, use compound resistant to
the action of liquefied petroleum gases.
3. Use ground joint unions.
4. Install a drip leg to trap dirt and moisture before it can enter
the gas valve. Drip leg must be a minimum of 3-inches long.
5. Install a manual shut-off valve.
6. Provide a 1/8" NPT test gauge connection immediately before
the gas supply connection to the furnace.
GAS CONNECTION
If the installation is for L.P. Gas, have L.P. installer use two-stage
regulation and make all connections from storage tank to furnace.
Use two pipe wrenches when making the connection to the valve
to prevent turning or damage to the gas valve.
Connections between the manual shutoff valve and burner control
assembly can be made with an A.G.A./C.G.A. design certified
flexible connector if allowed by local codes. Drip leg and ground
joint unions are still required.
Tighten all joints securely.
CHECKING THE GAS PIPING
Test all piping for leaks. When checking gas piping to the furnace
with gas pressure less than ½ psi, shut off the manual gas valve
to the furnace. If gas piping is to be checked with the pressure at
or above ½ psi, the furnace and manual shut off valve must be

Electrical Wiring

WARNING: Danger of property damage, bodily
injury or death. Turn off electric power at the fuse
box or service panel before making any electrical
connections. Insulate where necessary. All line
voltage and ground connections must be completed
before electrical power is restored.
All electrical work must conform to your local codes and
ordinances or in their absence, with National Electrical Code,
ANSI/NFPA 70. If you are not familiar with wiring codes, in
general, have a competent electrician do this job. In Canada:
Follow C22.1, Canadian Electrical Code.
CAUTION: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
CAUTION: Do not connect 115V service line to the
gas control valve or wall thermostat.
disconnected during testing. (SEE WARNING) Apply soap
solution to each joint. Bubbles forming indicate a leak. Correct
even the slightest leak at once.
FIGURE 26 Gas Pipe Sizes
PIPE CAPACITY - Btu/hr.
PIPE CAPACITY - Btu/hr.
WARNING: Danger of property damage, bodily
injury or loss of life. Never use a match or open
flame to test for leaks. Never exceed specified
pressures for testing. High pressures may damage
the gas valve and cause over-firing which may
result in heat exchanger failure. Liquid petroleum
(L.P. Gas) is heavier than air and it will settle in any
low area, including open depressions and it will
remain there unless area is ventilated.
Never attempt startup of the unit before thoroughly
ventilating area.
ELECTRICAL CONNECTION
Refer to paragraph covering GAS AND ELECTRICAL SUPPLY
OPENINGS, Page 10. Follow Wiring Diagrams, Pages 30 and 31.
If you have any doubt regarding the electrical hookup, or
compliance with code or ordinance, consult your electrical
inspector or a licensed electrician.
HELPFUL HINT
After wire nuts are screwed to wires, a small strip of electrical tape
can be applied over wire nut at its base and onto wires to make a
very solid connection.