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Installation: Piping
Pipe directly in to combination valve (see
p.
18).
5. A 1/8 in. N.P .T. plugged tapping, accessible for test
gauge connection, must be installed immediately
upstream of the gas supply connection to the
appliance.
6. Provide a drip leg in the gas piping near the gas duct
furnace. A ground joint union and a manual gas shutoff
valve should be installed ahead of the unit heater
controls to permit servicing. The manual shutoff valve
must be located external to the jacket (see
p.
18).
7. Make certain that all connections have been
adequately doped and tightened.
NOTICE:
Overtightening!
Do not overtighten the inlet gas piping into the valve.
This may cause stresses that could crack the valve!
Note: Use pipe joint sealant resistant to the action of
liquefied petroleum gases regardless of gas
conducted.
WARNING
Hazard of Explosion!
Never use an open flame to detect gas leaks. Explosive
conditions may occur. Use a leak test solution or other
approved methods for leak testing. Failure to follow
recommended safe leak test procedures could result in
death or serious injury or equipment or property-only-
damage.
Figure 8. Pipe installation, standard controls
D 3 6 31 C
The appliance and its individual shutoff valve must be
disconnected from the gas supply piping system during
any pressure testing of that system in excess of 1/2 psig
(3.5 kPa).
18
Figure 8,
The appliance must be isolated from the gas supply piping
system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 psig
(3.5 kPa).
Table 5.
Gas Type
Manifold Pressure
Figure 8,
Supply Inlet Pressure 14.0 in. wc Max.
(a)
Installation: Venting
Combustion Air Venting and Piping
Exhaust Fumes!
Each duct furnace MUST have its own combustion air
system and MUST NOT be connected to other air intake
systems. To prevent exhaust fumes from being pulled
into the air intake system or improper heating, ensure
that the duct furnace has its own combustion air
system and is not connected to other air intake
systems. Failure to follow these recommendations
could result in death or serious injury or equipment
damage.
Carbon Monoxide!
Your venting system must not be blocked by any snow,
snow drifts, or any foreign matter. Inspect your venting
system to ensure adequate ventilation exists at all
times! A blocked venting system could result in carbon
monoxide poisoning. Symptoms of such condition
include grogginess, lethargy, inappropriate tiredness, or
flu-like symptoms. Failure to follow these
recommendations could result in death or serious
injury.
Gas piping requirements
Natural Gas
3.5 in. wc
(0.9 kPa)
(3.5 kPa)
5.5 in wc Min.
(1.4 kPa)
WARNING
WARNING
(a)
Propane (LP) Gas
10.5 in. wc
(2.6 kPa)
14.0 in. wc Max.
(3.5 kPa)
13.0 in wc Min.
(3.2 kPa)
GMND-SVX01B-EN
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