Sterling SF User Manual
INSTALLATION AND SERVICE MANUAL
HORIZONTAL COMBUSTION AIR INLET KITS
CATEGORY III VENTING FOR SEPARATED COMBUSTION
TUBULAR GAS FIRED UNIT HEATERS
USE 5 INCH KIT FOR UNITS WITH CAPACITIES 100,000 TO 250,000 BTU/HR
USE 6 INCH KIT FOR UNITS WITH CAPACITIES 300,000 TO 400,000 BTU/HR
Supplement to unit installation instructions – STPIM or STBII
Improper installation, adjustment, alteration,
service or maintenance can cause property damage, injury or
death. Read this supplement and the unit heater installation,
operating and maintenance instructions thoroughly before
installing or servicing this equipment.
This Combustion Air Inlet Kit utilizes one 5 or 6 inch termination in which both the
discharge fl ue gas and the combustion air inlet pass.
HCAK-IOM-3
J30-09025
The location of the vent terminal must be in accordance with the National Fuel Code ANSI Z223.1 (NFPA 54) 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 and Figure 3.
KIT CONTENTS:
Figure 1a – 5 Inch Combustion Air Inlet Kit
#1 – Part No. 11J37R02222-002
(1) Flue Vent Terminal
#2 – Part No. 11507R08560
(1) Combustion Air Inlet Box
Assembly (see Figure 2a
for dimensional data)
#3 – Part No. 11J37R08572
(1) Air Inlet Screen
#4 – Part No. 11507R08569
(1) Defl ector Disk
Also Included:
(1) Part No. J30-09025
Installation Instructions
(1) Part No. 11H03R03612-002
Tube of High Temp Silicone
Sealant
1
2
D8981B
Figure 1b – 6 Inch Combustion Air Inlet Kit
#1 – Part No. 11J37R02222-003
(1) Flue Vent Terminal
#2 – Part No. 11507R08951
(1) Combustion Air Inlet Box
4
3
Assembly (see Figure 2b
for dimensional data)
#3 – Part No. 11J37R08957
(1) Air Inlet Screen
#4 – Part No. 11507R09012
(1) Defl ector Disk
Also Included:
(1) Part No. J30-09025
Installation Instructions
(1) Part No. 11H03R03612-002
Tube of High Temp Silicone
Sealant
1
2
3
D9014B
4
08/13
260 NORTH ELM ST., WESTFIELD, MA 01085
TEL: (413) 568-9571 FAX: (413) 562-8437
www.mestek.com
DIMENSIONAL DATA
Figure 2a – 5 Inch Combustion Air Inlet Box Assembly
5.75"
(146.1mm)
5"
12"
(304.8mm)
Figure 2b – 6 Inch Combustion Air Inlet Box Assembly
(127mm)
5"
(127mm)
8"
(203.2mm)
15"
(381mm)
D9015B
2
14.125"
(358.8mm)
6.75"
(171.45mm)
6"
(152.4mm)
7.125"
(181mm)
10"
(254mm)
17.125"
(435mm)
D9016B
VENTING – GENERAL GUIDELINES
All unit heaters 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. Refer to notes* below for Canadian installations.
CARBON MONOXIDE! Your venting system must not be blocked by any snow, snow drifts, or
any foreign matter. Inspect your venting system to ensure adequate ventilation exists 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).
When an existing heater is removed or replaced in
venting system, the venting system may not be properly
sized to vent the attached appliances. An improperly
sized vent system can cause formulation of condensate
or leakage or spillage of fl ue gases.
The following steps shall be followed with each appliance
connected to the venting system placed in operation,
while any other appliances connected to the venting
system are not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel
Gas Code, ANSI Z223.1 (NFPA 54) and these
instructions. Determine that there is no blockage or
restriction, leakage, corrosion and other
defi ciencies, which could cause an unsafe
condition.
3. In so far as practical, close all building doors and
windows and all doors between the space in which
the appliance(s) connected to the venting system
are located and other spaces of the building. Turn
on clothes dryers and any exhaust fans, such as
range hoods and bathroom exhausts, so they
shall operate at maximum speed. Do not operate
a summer exhaust fan. Close fi replace damper.
4. Follow the lighting instructions. Place the appliance
being inspected in operation. Adjust thermostat so
that the appliance will operate continuously.
5. After it has been determined that each appliance
connected to the venting system properly vents
when tested as outline above, return doors,
windows, exhaust fans, fi replace dampers,
and any other gas-burning appliance to their
previous condition of use.
6. If improper venting is observed during any of the
above tests, the venting system must be corrected
immediately so that the system conforms with the
National Fuel Gas Code, ANSI Z223.1 (NFPA 54).
When resizing any portion of the venting system, the
venting system should be resized to approach the
minimum size as determined using the appropriate
tables in Appendix G of the National Fuel Gas Code,
ANSI Z223.1 (NFPA 54).
The unit heater shall be connected to a factory built
chimney or vent complying with a recognized standard,
or a masonry or concrete chimney lined with a lining
material acceptable to the authority having jurisdiction.
Venting into an unlined masonry chimney is
prohibited.
ADDITIONAL REQUIREMENTS FOR CANADIAN INSTALLATIONS
*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.
3
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