Sterling QVES - Manual (Page 11)

11
ALL DUCT FURNACES MUST BE VENTED! All venting
installations shall be in accordance with the latest edition
of Part 7, venting of Equipment of the National Fuel Gas
Code, ANSI Z223.1, or applicable provisions of local
building codes for natural or power vented units. Also see
page 13 for additional Canadian installations.
Horizontal vent systems must be in compliance with
U L 1 7 3 8 fo r i n s t a l l a t i o n s i n t h e U n i t e d S t a t e s,
and ULS636 for installations in Canada.
Power vented units are designed to be used with
single wall vent pipe utilizing horizontal or ver tical
venting arrangements. These arrangements must
terminate external to the building using either a
single wall or double wall (Type B) vent. See Figure 7
thru 13 for special installation requirements regarding
these venting conditions.
Do not use a type B (double wall)
vent internally within the building on power
vented units!
If double wall venting is used, components which are UL
Listed and approved for Category
III positive pressure
venting systems MUST be used.
A Briedart Type L, Field Starkap or an equivalent vent
cap must be supplied by the customer for each power
vented unit. The vent pipe diameter MUST be as
specifi ed in Table 1 (“D” Dia. Flue Opening). A reducer
must be field installed for 100 through 175 MBH Unit
Sizes. All 300 through 400 MBH Unit sizes are factory
equipped with the required flue increaser. Refer to
Figures 11 thru 13 for additional requirements.
Refer to Table 4 for vent ter mination clearance
requirements.
Through the wall vents for these appliances shall NOT
terminate over public walkways, or over an area where
condensate or vapor could create a nuisance or hazard
or could be detrimental to the operation of regulators,
relief valves, or other equipment.
The vent pipe equivalent length must be 5 ft. (1.5m)
minimum and must not exceed 50 ft. (15.2m). Equivalent
length is the total length of straight sections PLUS 15 ft.
(4.6m) for each 90 degree elbow, 8 ft. (2.4m) for each 45
degree elbow, and 10 ft. (3.0m) for the vent cap.
Maintain 6 in. (152mm) between vent pipe and
combustible materials. A minimum of 12 in. (305mm)
of straight pipe is required from the venter outlet before
installing an elbow in the vent system. An elbow should
never be attached directly to the venter!
Use single wall pipe constructed of 26 gauge
galvanized steel or material of equivalent durability and
corrosion resistance for the vent system. For installation
in Canada, use pipe constructed from 0.025 inch thick
aluminum or 0.018 inch thick stainless steel.
VENTING FOR POWER VENTED (CATEGORY III) DUCT FURNACES
(Figures 1 and 2)
Never use a pipe of a diameter
other than that specified in Table 1! Never use
PVC or other nonmetallic pipe for venting! To
do so may result in serious damage to the unit
or severe personal injury or death!
Any run of single wall vent pipe passing through an
unheated space must be insulated with an insulation
suitable to 550°F.
Seal ALL vent pipe joints and seams to prevent leakage.
Use General Electric RTV-108 or Dow-Corning RTV-
732 silicone sealant or 3M #425 aluminum foil tape or
equivalent.
The vent system must be installed to prevent collection of
condensate. Vertical vent pipes should be equipped with
condensate drains. Pitch horizontal pipes downward 1/4 in.
per foot (21mm/m) toward outlet for condensate drainage.
Horizontal por tions of the venting system shall be
supported at maximum intervals of 4 feet (1.2m) to
prevent sagging (in Canada, support at 3 feet (1m)
maximum intervals).
Insulate single wall vent pipe exposed to cold air or
running through unheated areas.
Each unit must have an individual vent pipe and vent
terminal per furnace section! Each unit MUST NOT be
connected to other vent systems or to a chimney.
Units are shipped from the factory set up for vertical
venting. To conver t the power venter for horizontal
venting, remove the shipping support bracket, and follow
this procedure:
1. Hold power venter motor in position.
2. Remove the three Phillips-head screws from the
motor adaptor plate.
3. Remove the three screws which connect the
power venter stack to the power venter housing.
4. Rotate the power venter housing to the horizontal
position.
5. Replace screws accordingly.
NOTICE: The motor, pressure switch, and junction
box bracket MUST remain located as shipped
from the factory. Rotate only the blower housing!
If the power venter housing is to be moved to the
right horizontal position, the junction box must be
rotated 90 degrees CCW to clear the connection.
To do this, remove all wires, conduit and conduit
connector from the junction box, noting location
of wires. Move box, using holes provided. Move
7/8" plug from bottom of box to side. Reconnect all
wires according to the unit’s wiring diagram.