Bosch GWH 425 PN Installation Manual download pdf (Page 5)

5AQ4 Manual

2 AQ4 Installation instructions

2.1 Introduction

Please follow these instructions. Failure to follow

instructions may result in:

· Damage, injury or death

· Improper operation

· Loss of warranty

If you are unable to perform the tasks required to

install the water heater and this accessory properly,

please contact a locally licensed plumber, HVAC

contractor or gas technician.

Please contact Bosch Water Heating with any

questions.

2.2 Locating power vent hood and

clearances

The maximum vent length from the water heater to

the point of termination is 25 feet with one elbow. If

using more than one 90° elbow, subtract 5 feet off

the maximum vent length for each additional elbow

used. Maximum of three elbows allowed.

The power vent motor must be installed

as close as possible to the VH1-4 vent

hood.

Clearances

The vent system must terminate so that proper

clearances from the center of the vent hood (Fig.

1) are maintained as cited in the National Fuel Gas

Code, ANSI Z223.1 and CSA B149.1 in Canada:

“The vent terminal shall also not be installed closer than 3

feet from the inside corner of an L-shaped structure, or less

than 1 foot above grade or anticipated snow pack level.”

Also:

“The exit terminals of mechanical vent system shall be located

not less than 7 feet above grade when located adjacent to a

public walkway. The venting system shall terminate at least

3 feet above any forced air inlet within 10 feet. The venting

system shall terminate at least 4 feet below, 4 feet horizontally

from or 1 foot above any door, window or gravity air inlet into

any building.”

2.3 Power vent hood

1. Attach the mounting template (on page 13)

to the interior wall that the vent hood will be

penetrating.

2. Ensure that the proposed vent termination

clearances are met (Chapter 2.2) before cutting

opening through wall. Using a 1/2” drill bit, drill

two pilot holes where noted on the template. The

drill bit must be long enough to penetrate to the

building exterior.

3. Attach the template to the outside of the building

aligning the pilot holes on the template with the

pilot holes drilled in step 2.

4. Using a reciprocating saw, cut a hole through the

building siding, wall board, etc., following the

appropriate lines of the template.

5. Apply a bead of exterior-rated caulk to the vent

hood ange to seal at the exterior of building.

6. Slide the vent hood through the opening and

fasten to exterior wall using screws provided.

7. Install backdraft apper using the instructions

included with apper.

AQ4 Installation instructions

Fig. 1 External vent hood clearances

1 2 3 4 5 6 7 8 9 10 ... 15 16

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Bosch GWH 425 PN Installation Manual Page 5

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