Sterling TD User Manual
INSTALLATION INSTRUCTIONS
AIR INLET KITS
CATEGORY III VENTING FOR SEPARATED COMBUSTION
TUBULAR GAS FIRED DUCT FURNACES
USE 5" KIT FOR UNITS WITH CAPACITIES 100,000 TO 200,000 BTU/HR
USE 6" KIT FOR UNITS WITH CAPACITIES 250,000 TO 400,000 BTU/HR
Supplement to unit installation instructions – TDII
Improper installation, adjustment, alteration,
service or maintenance can cause property damage, injury or
death. Read this supplement and the unit heater installation,
operation and maintenance instructions thoroughly before
installing or servicing this equipment.
This Air Inlet Kit utilizes a 5 or 6 inch collar and gaskets to allow a tubular indoor duct
furnace to be converted to separated combustion. Included in the kit is a vent cap to
be placed at the termination of the new air inlet pipe. Note: a vent cap is also required
for the exhaust pipe termination and is available for purchase separately from this kit.
AIK-IOM-1
J30-09444X9
The location of the vent terminal must be in accordance with the National Fuel Code ANSI Z223.1 in the U.S.
or the Natural Gas Installation Code CSA-B149.1 or the Propane Gas Installation Cade CSA-B149.2 in Canada.
Minimum clearances are shown in Table 1.
KIT CONTENTS:
Figure 1a – 5 Inch Air Inlet Kit Figure 1b – 6 Inch Air Inlet Kit
#1 – Part No. 11J37R02222-002
(1) Vent Cap
#2 – Part No. 11257R08567
(1) Air Inlet Collar – 5"
#3 – Part No. 11252R09198-001
(1) Air Inlet Collar Gasket – 5"
Also Included:
(1) Part No. J30-09444X9
Installation Instructions
(1) Part No. 11H03R03612-002
Tube of High Temp Silicone
Sealant
(1) Part No. 11262R08614-006
Access Panel Gasket –
86.75"
1
#1 – Part No. 11J37R02222-003
(1) Vent Cap
#2 – Part No. 11257R08956
(1) Air Inlet Collar – 6"
#3 – Part No. 11252R09198-002
(1) Air Inlet Collar Gasket – 6"
Also Included:
(1) Part No. J30-09444X9
2
3
Installation Instructions
(1) Part No. 11H03R03612-002
Tube of High Temp Silicone
Sealant
(1) Part No. 11262R08614-007
Access Panel Gasket –
112.75"
2
3
1
03/14
D9460
D9461
260 NORTH ELM ST., WESTFIELD, MA 01085
TEL: (413) 568-9571 FAX: (413) 562-8437
www.mestek.com
VENTING FOR POWER VENTED DUCT FURNACES (CATEGORY III)
GENERAL GUIDELINES
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 (NFPA 54), or applicable provisions of local
building codes for power vented units. Refer to Figures 3a, 3b, 4a, 4b, 5a, and 5b. For installations in Canada, see
page 3.
CARBON MONOXIDE! Y our venting system m ust not be bloc ked by an y snow , snow drifts, or
any foreign matter . Inspect y our venting system to ensure adequate ventilation e xists at all times! Failure to
heed these warnings could result in Carbon Monoxide Poisoning (symptoms include grogginess, lethargy,
inappropriate tiredness, or fl u-like symptoms).
NOTICE: All vertical and horizontal venting arrangements for the Tubular Duct Furnace are Category III
venting.
ANSI now organizes vented appliances into four
categories.
Venting Categories
Non
Condensing Condensing
Negative
Vent Pressure
Positive
Vent Pressure
III
III
IV
Category I
Includes non-condensing appliances with negative vent
pressure, like the traditional atmospheric unit heater.
Category II
Groups condensing appliances with negative vent
pressure.
Category III
Appliances are non-condensing and operate with a
positive vent pressure.
Category IV
Covers condensing appliances with positive vent
pressure.
Do not damper or add heat recovery devices to the fl ue
piping. Failure to open such a damper prior to operating
gas unit will result in the spillage of fl ue gas into the
occupied space.
Vent pipe material must be in compliance with UL 1738
for installations in the United States, and UL S636 for
installations in Canada.
Refer to Table 1 for vent termination clearance
requirements.
The vent pipe equivalent length must be 5 feet (1.5m)
minimum and must not exceed 50 feet (15.2m).
Equivalent length is the total length of straight
sections PLUS 10 feet (3.05m) for each 90 degree
elbow, and 4 feet (1.22M) for each 45 degree elbow.
Maintain 6 inch (152mm) between vent pipe and
combustible materials. A minimum of 12 inch (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!
Never use a pipe of a diameter other
than that specifi ed in T able 1! Never use PVC or other
nonmetallic pipe for venting! To do so may result in
serious damage to the unit, severe personal injury,
or death.
Any run of single wall vent pipe exposed to cold air or
passing through an unheated space must be insulated
with insulation suitable to 550°F (288°C).
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 inch per foot (21mm/m) toward outlet for
condensate drainage.
Horizontal portions of the venting system shall be
supported at maximum intervals of 4 feet (1.2m) to
prevent sagging. In Canada, support at a maximum
of 3 feet (1m) intervals.
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.
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.
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VENTING FOR POWER VENTED DUCT FURNACES (CATEGORY III)
GENERAL GUIDELINES (CONTINUED)
Table 1
Vent Systems Termination Clearance Requirements
Minimum Clearances for
Structure/Object
9 in. for 10,000
Door, window or gravity vent inlet; combustion
air inlet for other appliances
Forced air inlet within 10 ft. 3 ft. above 6 ft. (1.8m)
Adjoining building or parapet 10 ft. 10 ft. (3.04m)
Adjacent public walkways 7 ft. above grade 7 ft. (2.1m) above grade
Electric, gas meters & regulators 4 ft. horizontal
Above grade level* 1 ft. 1 ft. (0.3m)
to 50,000 BTU/Hr input;
12 in. for input
exceeding 50,000 BTU/Hr
Termination Locations
USA CANADA
9 in. (230mm) for 10,000
to 50,000 BTU/Hr input;
12 in. (305mm) for input
exceeding 50,000 BTU/Hr
3 ft. (0.9m) horizontally from
meter/regulator assembly.
6 ft. (1.8m), any direction,
from a gas service regulator
vent outlet
* Minimum above maximum snow depth, or per local code, whichever is greater.
ADDITIONAL REQUIREMENTS FOR CANADIAN INSTALLATIONS
REFER TO SPECIFICATION TABLE AND INSTALLATION MANUAL FOR PROPER USAGE
The following instructions apply to Canadian installations in addition to installation and operating instructions.
1. Installation must conform with local building codes,
or in the absence of local codes, with current
CSA-B149.1, Installation Codes for Natural
Gas Burning Appliances and Equipment, or
CSA-B149.2, Installation Codes for Propane
Gas Burning Appliances and Equipment.
2. Any reference to U.S. standards or codes in these
instructions are to be ignored, and the applicable
Canadian standards or codes applied.
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