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LAARS Rheos RHCV - Install and Operating Manual User Manual

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Rheos Boiler and Water Heater

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above grade directly in line with the exhaust vent

terminal for the horizontally vented gas fueled

heating appliance or equipment. The sign shall

read, in print size no less than one-half (½) inch

in size, “GAS VENT DIRECTLY BELOW.

KEEP CLEAR OF ALL OBSTRUCTIONS”.

4. INSPECTION.

The state or local gas inspector of the side

wall horizontally vented gas fueled equipment

shall not approve the installation unless, upon

inspection, the inspector observes carbon

monoxide detectors and signage installed in

accordance with the provisions of 248 CMR

5.08(2)(a) 1 through 4.

(b) EXEMPTIONS: The following equipment is

exempt from 248 CMR 5.08(2)(a) 1 through 4:

1. The equipment listed in Chapter 10 entitled

“Equipment Not Required To Be Vented” in the

most current edition of NFPA 54 as adopted by

the Board; and

2. Product Approved side wall horizontal vented gas

fueled equipment installed in a room or structure

separate from the dwelling, building or structure

used in whole or in part for residential purposes.

(c) MANUFACTURER REQUIREMENTS

– GAS EQUIPMENT VENTING SYSTEM

PROVIDED. When the manufacturer of

Product Approved side wall horizontally

vented gas equipment provides a venting

system design or venting system components

with the equipment, the instructions provided

by the manufacturer for installation of the

equipment and the venting system shall

include:

1. Detailed instructions for the installation of the

venting system design or the venting system

components; and

2. A complete parts list for the venting system

design or venting system.

(d) MANUFACTURER REQUIREMENTS –

GAS EQUIPMENT VENTING SYSTEMNOT

PROVIDED. When the manufacturer of a

Product Approved side wall horizontally

vented gas fueled equipment does not

provide the parts for venting the fuel gases,

but identifies “special venting systems”, the

following requirements shall be satisfied by

the manufacturer:

1. The identification of each “special venting

system” shall include either the listing of the

website, phone number or manufacturer’s address

where the venting system installation instructions

can be obtained; and

2. The “special venting systems” shall be Product

Approved by the Board, and the instructions

provided with that system shall include a parts

list and detailed installation instructions.

(e) A copy of all installation instructions for the

Product Approved side wall horizontally

vented gas fueled equipment, and all the

venting instructions, parts lists, and/or design

instructions for the venting system shall

remain with the appliance or equipment at the

completion of the installation.

Manufacturers' websites where venting system

installation instructions may be obtained is

located on the Laars website at: http://www.

laars.com.

2.3.2 Side Wall Combustion Air Terminal

The Laars side wall combustion air terminal (see

Table 4) must be used when the heater takes air from a

side wall. Consider the following when installing the

terminal:

1. Do not locate the air inlet terminal near a source

of corrosive chemical fumes (e.g., cleaning fluid,

chlorine compounds, etc.)

2. Locate the terminal so that it will not be subject

to damage by accident or vandalism. It must be at

least 7 feet (2.1m) above a public walkway.

3. Locate the combustion air terminal so that it

cannot be blocked by snow. The National Fuel

Gas Code requires that it be at least 12 inches

(30cm) above grade, but the installer may

determine it should be higher, depending upon

local conditions.

4. If the Rheos is side-wall vented to the same wall,

locate the vent terminal at least 3 feet (0.9m)

horizontally from the combustion air terminal,

and locate the vent terminal at least 1 foot (0.3m)

above the combustion air terminal (see Figure 3).

2.3.3 Vertical Vent Terminal

When the unit is vented through the roof, the

vent must extend at least 3 feet (0.9m) above the point

at which it penetrates the roof. It must extend at least

2 feet (0.6m) higher than any portion of a building

within a horizontal distance of 10 feet (3.0m), and high

enough above the roof line to prevent blockage from

snow. When the combustion air is taken from the roof,

the combustion air must terminate at least 12" (30cm)

below the vent terminal (see Figure 2).

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