24
UHE
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F / EIH
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F I&O Manual
IM100205
RD: APR 2019
RL: 02C
appliance Category, and specifications below.
◼
All venting must meet requirements of Local Codes or, in the absence of local codes, with the
National Fuel Gas Code,
ANSI Z223.1/NFPA 54; or the
Natural Gas and Propane Installation
Code
CSA B149.1.
◼
A vent connector shall comply with local codes and be firmly attached to the flue collar by 3 x
1/2”
sheet metal screws.
◼
Install a minimum
12” [305
mm] straight vent connector before any Tee or 90° Elbow.
◼
The connection of vent components must be secured as specified in the installation instruc-
tions by the vent manufacturer.
◼
For vertical vent, any horizontal vent section will slope upwards away from the heater not less
than 1/4 inch rise per foot of run.
◼
For horizontal vent, slope downward away from heater a maximum of 1/4 inch down per foot of
run.
◼
When the vent pipe passes through a cold or unheated area where the ambient temperature is
likely to produce condensation of the flue gases, the vent pipe will be insulated with a suitable
material as certified and specified by the insulation manufacturer to withstand temperature up
to 460°F (238°C).
◼
The vent system must
always
be adequately supported to
prevent sagging.
◼
The vent configuration will allow for expansion and contraction in length of the tube heater.
◼
As an Option for vertical vent, two heaters may be vented through an approved common 4" x
4" x 6" Vent Tee (10 x 10 x 15 cm), supplied by the manufacturer, or by using approved com-
ponents as indicated in local codes. Vent pipe from each heater is not required to be equidis-
tant to the vent Tee, but must comply with local code requirements. A common thermostat or
“
ON/OFF
”
switch must control commonly vented heaters.
Common vent is not allowed for
Category III horizontal vent application.
COMBINED SYSTEM LENGTH: Tube Vent + Combustion Air Duct
:
◼
Refer to the Table next page, COMBINED SYSTEM LENGTH: TUBE + AIR DUCT + VENT
.
Lengths in the table apply to either Vertical or Horizontal vent.
◼
COMBINED SYSTEM LENGTH includes:
Tube Heater combustion air duct + vent +
elbows. Each 90° elbow in the system has an equivalent length of 5 ft.
◼
A maximum of 2 elbows is allowed in any portion (duct, tube heater, vent) with the exception of
up to three 90° elbows in a vertical vent run through the roof, for a total of maximum 6 (vertical
vent: 7) 90° elbows in the combined system.
◼
Combustion air duct is not to exceed lengths in table below and may be
4”
or
5”
diameter
◼
Exceeding the allowable lengths in the table below can create combustion and/or condensa-
tion issues and will void Certification and the heater warranty.
◼
Do not exceed the
Maximum Combined System Length
regardless of the allowed maximum
length of individual vent or combustion air duct.