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DRAFT HOOD
VENT TO OUTDOORS
OR.OHOMH'_Y
Be sure vent pipe is properly connected to prevent escape of
dangerous flue gases which could cause deadly asphyxiation.
Chemical vapor corrosion of the flue and vent system may
occur if air for combustion contains certain chemical vapors.
Spray can propellants, cleaning solvents, refrigerator and air
conditioner refrigerants, swimming pool chemicals, calcium
and sodium chloride, waxes, bleach and process chemicals
are typical compounds which are potentially corrosive.
Gas Piping
FIGURE 17.
The vent pipe from the water heater must be no less than the
diameter of the draft hood outlet on the water heater and must
slope upward at least 1/4 inch per linear foot (21 mm per meter),
see Figure 18.
TO
CHmMNEY
FIGURE18.
All vent gases must be completely vented to the outdoors of the
structure (dwelling). Install only the draft hood provided with
the new water heater and no other draft hood.
Vent pipes must be secured at each joint with sheet metal
SCreWS.
There must be a minimum of 6 inches (153 mm) clearance
between single wall vent pipe and any combustible material.
Fill and sea! any clearance between single wal! vent pipe and
combustible material with mortar mix, cement, or other
noncombustible substance. For other than single wall, follow
vent pipe manufacturer's clearance specifications. To insure
a tight fit of the vent pipe in a brick chimney, seal around the
vent pipe with mortar mix cement.
• Flue gases may escape if vent
pipe is not connected
- Do not store corrosive chemicals
in vicinity of water heater.
• Chemical corrosion of flue and
vent system can cause serious
injury or death
- Contact a qualified instalbr or
service agency.
Breathing carbon monoxide can cause brain damage
or death. Always read and understand instruction manual.
Failure to have required clearances between vent piping and
combustible material will result in a fire hazard.
Fire and Expmosion Hazard
Do not use water heater with
any gas other than the gas
shown on the rating plate.
Excessive pressure to gas
control valve can cause serious
injury or death
Turn off gas lines during
installation
Contact qualified installer or
service agency
16
Make sure the gas supplied is the same type listed on the
model rating plate. The inlet gas pressure must not exceed
14 inch water column (3.5kPa) for natural and propane gas
(L.R). The minimum inlet gas pressure listed on the rating
plate is for the purpose of input adjustment. If the gas control
valve is subjected to pressures exceeding 1/2 pound per square
inch (3.5kPa), the damage to the gas control valve could result
in a fire or explosion from leaking gas.
If the main gas line shut-off serving all gas appliances is used,
also turn "OFF" the gas at each appliance. Leave all gas
appliances shut "OFF" until the water heater installation is
complete.
A gas line of sufficient size must be run to the water heater.
Consult the current edition of National Fuel Gas Code ANSI
Z223.1/NFPA 54 and your gas supplier concerning pipe size.
There must be:
* A readily accessible manual shut off valve in the gas supply
line serving the water heater, and
* A drip leg (sediment trap) ahead of the gas control valve to
help prevent dirt and foreign materials from entering the
gas control valve.
* A flexible gas connector or a ground joint union between the
shut off valve and control valve to permit servicing of the unit.
Be sure to check al! the gas piping for leaks before lighting the
water heater. Use a soapy water solution, not a match or open
flame. Rinse off soapy solution and wipe dry.
The minimum inlet gas pressure shown on the rating plate is
that which will permit firing at the rated input.