Rapid Engineering UHAM 150 Installation, Operation & Service Manual Download

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UHA S

TANDARD

NIT

EATER

NSTALLATION

PERATION AND

ERVICE

ANUAL

10 of 59

SECTION 7: VENTING

7.1 Venting

This heater must be vented in accordance with the

rules contained in this manual and with the following
national codes and any state, provincial or local
codes which may apply:

United States:

Refer to

NFPA 54/ANSI Z223.1 - latest revision, National
Fuel Gas Code;

Canada:

Refer to CSA B149.1

Natural Gas and Propane Installation Code.

The bottom of the vent or air intake terminal shall not

be located less than 1' (.3 m) above grade level.

The vent shall not terminate less than 7' (2.1 m)

above grade where located adjacent to public
walkways.

Vent terminal must be installed at a height sufficient

to prevent blockage by snow and building materials
protected from degradation by flue gasses.

Vent terminal must be beyond any combustible

overhang.

Secure all joints with corrosion resistant #8 x 3/8"
sheet metal screws.

For single wall venting, pressure sensitive aluminum
tape or silicone sealant must be used to seal all
joints.

Aluminum tape shall have a minimum temperature

rating of 400° F (204° C) and meet SMACNA AFTS-
100-73 standards. High temperature silicone
sealant must have a minimum temperature rating of
480° F (250° C).

7.1.1 United States Requirements

Vent must terminate at least 3' (.9 m) above any

forced air inlet located within 10' (3.1 m).

Vent must terminate at least 4' (1.2 m) below,

4' (1.2 m) horizontally from, or 1' (.3 m) above any
door, operable window, or gravity air inlet into any
building.

NFPA 54/ANSI Z223.1 - latest revision, National
Fuel Gas Code specifies a 4' (1.2 m) horizontal vent
terminal clearance from gas and electric meters,

regulators and relief equipment.

7.1.2 Canadian Requirements

The vent shall not terminate within 6' (1.8 m) of a

mechanical air supply inlet to any building.

The vent shall not terminate within 3' (.9 m) of a

window or door that can be opened in any building,
any non-mechanical air supply inlet to any building,
or of the combustion air inlet of any other piece of
equipment.

7.2 Vent Installation

Maintain clearances to combustibles at all times for
safety. Clearances are the required distances that
combustible objects must be away from the heater
to prevent serious fire hazard. See Page 7, Figure 3.
For vented units, the vent must terminate outside of
the building.

Vents must be fully sealed and correctly sized for

the model. If the vent passes through a wall or
ceiling of combustible material, it must be enclosed
by a listed thimble and be separated from the
thimble by at least a 2" (5 cm) air gap.
For separated combustion models, vents and air
intakes must be a fully sealed system and correctly
sized for the model. Vent should be assembled as
detailed on Page 12, Figure 5 thr ough Page 16,
Figure 10. The joints between the vent terminal and
the roof or wall must be properly sealed. If the vent
passes through a wall or ceiling of combustible
material, it must be enclosed by a listed thimble and
be separated from the thimble by at least a 2" (5 cm)
air gap.

Vents and air intakes must be adequately

supported so that the heater does not bear the
weight of the pipes.

For vent termination See Page 12, Figure 5 thr ough
Page 16, Figure 10.

7.2.1 Standard Vented Heaters
(Models UHA[T][M][X] 150-400)

The vent must be fitted with a low resistance

terminal. See Page 12, Figure 5 thr ough Page 14,
Figure 7. Standard vented heaters do not allow
outdoor air intake for combustion air.

7.2.2 Separated Combustion Heaters
(Models UHA[T][M][X]S 150-400)

The heaters are designed to be installed as

separated combustion heaters. The vent and air
intake are run as separate pipes to the wall or roof
terminals. See Page 15, Figure 8. As an option, the
vent and air intake are run as separate pipes to a

WARNING

Carbon Monoxide Hazard

Heaters must be vented

outdoors.

Heaters must be installed

according to the

installation manual.

Failure to follow these

instructions can result in

death or injury.