Williams FORSAIRE 4007332 Owner's Manual page 17

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 mal
function may result from excess pipe within
control. Apply moderate amount of good quality
dope to pipe only, leaving 2 end threads bare. If
propane gas installation, use compound resistant to
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 installation is for propane gas, have propane gas 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 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 1/2 PSI, shut off
manual gas valve to the furnace. If gas piping is to be
checked with the pressure at or above 1/2 PSI, the furnace
and manual shut off valve must be disconnected during
testing. (SEE WARNING.) Apply soap solution to each joint.
Bubbles forming indicate a leak. Correct even the slightest
leak at once.
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 (propane 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 unit before
thoroughly ventilating area.
FIGURE 26 - GAS PIPE SIZES
PIPE CAPACITY - BTU/hr. WITH FITTINGS
NATURAL GAS PIPE CAPACITY BTU/hr.
LENGTH PIPE SIZE (INCLUDES FITTINGS)
OF PIPE
FEET
1/2"
20
92,000
40
63,000
60
50,000
PROPANE PIPE CAPACITY BTU/hr.
LENGTH PIPE SIZE (INCLUDES FITTINGS)
OF PIPE
FEET 1/2"
20
189,000
40
129,000
60
103,000
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.
ELECTRICAL CONNECTION
Refer to paragraph covering GAS AND ELECTRICAL
SUPPLY OPENINGS, Page 10. Follow Wiring Diagrams,
Pages 28 and 29.
If you have any doubt regarding the electrical hookup, or
compliance with code or ordinance, consult your electrical
inspector or a licensed electrician.
FORSAIRE COUNTERFLOW DIRECT VENT GAS WALL HEATER
3/4" 1"
190,000 350,000
130,000 245,000
105,000 195,000
3/4" 1"
393,000 732,000
267,000 504,000
217,000 409,000
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