Install Instructions

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Instruction Sheet

409 High Pressure Vent

402-008

SUPERSEDES: November 1, 2003 EFFECTIVE: October 1, 2007

Plant ID: No. 001-3806

INSTALLATION INSTRUCTIONS:

1. The Taco 409 has to be mounted in a vertical (or upright)

position on places in a system where air collects natu-

rally. It will not operate properly if installed at an angle,

sideways, or upside down.

2. For the Taco 409 to vent air properly, the fill pressure of

the system must always be higher than atmospheric

pressure. If the atmospheric pressure is higher than the

fill pressure of the system, outside air will be pulled into

the system via the vent opening.

3. The Taco 409 is intended for installations filled with

100% water or approved glycol solutions (do not

exceed 50% glycol) for hydronic heating systems.

However, please check with your local dealer, distribu-

tor or representative when using other boiler or system

additives.

4. The Taco 409 will arrive with its air valve open. The air

valve can be closed off by turning the screw clockwise.

However, for automatic performance, the vent valve

must be open.

5. Please note that when installing a new system or retro-

fitting an old, you must flush out the disturbed dirt as

well as any oily film or solder paste entrained in the sys-

tem water. If this is not done, it is entirely possible that

the internal float mechanism will become clogged open,

causing the air vent to leak. For installations where pos-

sible property damage may occur due to fluid leaking

from the vent, a

⁄

" ID hose may be clamped to the air

vent outlet. The hose may then be fed to a drain or col-

lection area designed for the fluid in use. DO NOT USE

A SOLDER CONNECTION AT THE OUTLET!

6. Please leave these instructions with the end user.

1. Gearing

2. Venting valve

3. Air chamber

4. Float

5. Protective filter

6. Housing (brass)

⁄

" NPT connection

Maximum allowable working temperature: 240°F

Minimum allowable working temperature: 35°F

Maximum working pressure: 150 psi

CAUTION: Do

not solder here.

Product failure

will result.

Summary of content (2 pages)

PAGE 1
Instruction Sheet 402-008 409 High Pressure Vent SUPERSEDES: November 1, 2003 EFFECTIVE: October 1, 2007 Plant ID: No. 001-3806 INSTALLATION INSTRUCTIONS: 1. The Taco 409 has to be mounted in a vertical (or upright) position on places in a system where air collects naturally. It will not operate properly if installed at an angle, sideways, or upside down. 4. The Taco 409 will arrive with its air valve open. The air valve can be closed off by turning the screw clockwise.
PAGE 2
LIMITED WARRANTY STATEMENT Taco, Inc. will repair or replace without charge (at the company’s option) any product or part which is proven defective under normal use within one (1) year from the date of start-up or one (1) year and six (6) months from date of shipment (whichever occurs first).