Table of Contents
Advertisement
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. Seal penetrations and connections with high temperature RTV sili-
cone sealant.
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 Heater + Vent + Combustion Air Duct:
Refer to Table 4 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 length + 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 for
◼
inputs less than 200,000 Btuh, but must be 5" diameter for inputs 200,000 Btuh and greater.
• 5" diameter duct requires a reducer to 4" diameter at the connection to blower inlet.
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.
SPW2, STW2(S) / IWP2, IW2(S) I&O Manual
IM170629
RL: 03C
RD: APR 2019
30
Advertisement
Table of Contents
