13
HE+ Series Modulating Supplemental Manual
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 the two commonly vented heaters. Common vent is not allowed
for Category III horizontal vent application.
COMBINED SYSTEM LENGTH: Tube 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 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
