American Dryer Corp GWH 425 EF manual Venting, Inch

VENTING

WARNING: Do not reduce the vent pipe size and do not common vent with any other vented appliance or stove.

This appliance must be vented horizontally to the outside with a sealed 4” single wall vent pipe. The appliance’s flue gasses are under positive pressure and must travel through a single wall 4” pipe that is sealed gas tight. The 4” single wall vent pipe can be either stainless steel (AL29-4C) or galvanized steel with at least 26 gauge. CEC recommends the use of stainless steel vent pipe (which is equipped with sealing gaskets) for ease of installation and durability. When using galvanized vent pipe a minimum of 4 sheet metal screws per connection must be installed and all seams must be sealed with an approved high temperature silicone sealant. The vent system must be gas tight. See Fig. 4 for suggested venting installation diagrams.

The 425EF shall not be vented in combination with any other appliance. This appliance may only be vented horizontally with a dedicated sealed single wall vent. The 425EF shall not be vented into masonry chimneys or existing vertical vents of any material.

CAUTION: 425EF vent system must be installed by a qualified agency in accordance with these instructions. If improperly installed a hazardous condition such as explosion or Carbon Monoxide poisoning could result. Controlled Energy Corporation will not be responsible for improperly installed appliances.

Establish vent clearances that comply with vent manufacturer’s specifications. In all cases follow local codes. See table below.

The vent diameter must be 4”. The appliance should be located as close to the point of termination as possible (see Fig. 5 for locating the terminator). The vent system should be as straight and short as possible. The vent pipe must be 4” single wall stainless steel (AL29-4C) or galvanized steel pipe of 26 minimum gauge. Maximum vent length is 15

feet (4.6 m) with two 90-degree elbows. Subtract 5 feet from the total vent length for each additional 90-degree elbow used. No more than four 90-degree elbows may be used. Any short vertical portion of vent pipe used in the vent system shall be considered part of the allowable 15 feet (4.6 m) maximum run. Support the vent run at 4 foot intervals with overhead hangers. Horizontal sections of vent must rise ¼” for every foot of horizontal length. Any vent section greater than 45 degrees is considered and elbow.

Note: Single wall pipe should not be used in concealed, unoccupied or unheated locations. Listed thimbles or collars are necessary to pass through wall partitions. If the vent system passes through combustible areas where the vent clearance requirements cannot be maintained, it is permissible to chase straight sections of sealed 4 inch single wall vent through 5 inch (or greater) Type-B vent. The distance to combustibles using this chase technique is 1 inch. Note: Type-B vent should never be used as the actual vent system for the 425EF, as it is not gas tight.

Freeze Warning:

As mentioned on Page 6, negative air pressure in cold climates will cause a reverse airflow in the vent system that can freeze and damage the 425 EF heat exchanger when not in use. To prevent this the FXHOOD horizontal vent terminator, which was supplied separately with the water heater, needs to be installed on the end of the horizontal vent run (see page 9). The FXHOOD is a CSA approved vent terminator for the 425 EF and has a built in back draft flapper.

Flue Gas Sensor:

The 425 EF is equipped with a Flue Gas Sensor; it’s mounted on the left side of the draft diverter (Flue Gas Sensor - #33 on page 22). Before leaving the installation site verify proper Flue Gas Sensor operation by temporarily blocking termination outlet. Once blocked then operate the heater, the unit should shut down within 1-3 minutes when the flue gases are blocked. You must reset the electrical power to the heater after this safety test has been conducted, otherwise the unit will not operate.

The flue gas exhaust temperature on the 425 EF is 356°F (180°C)

Venting Material	Exhaust vent	Exhaust vent maximum
Options	diameter	distance
Single wall stainless		15 feet (4.6 m) with two
steel (AL29-4C)	4 inch	elbows. Less 5 feet for
sealed vent pipe		each additional elbow.
Single wall galvanized
vent pipe (min. 26		15 feet (4.6 m) with two
gauge and sealed	4 inch	elbows. Less 5 feet for
with high temperature		each additional elbow.
silicone)

Clearances

from venting

material

Vent pipe within an	Vent pipe within an
unenclosed space	enclosed space
*See manufacturer's	*See manufacturer's
specifications	specifications
3 inches	NOT PERMISSIBLE

*Stainless steel (AL29-4C) vent pipe manufacturer's are Z-Flex, Protech and Heat Fab. The manufacturer's specified clearances are identified on the venting material. NOTE: clearance distances are variable depending if the vent pipe is installed in an enclosed or unenclosed space, the exhaust flue gas temperature and the orientation of the vent pipe.

8 6 720 607 017