Sterling RT - Manual (Page 3)

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The venting is an integral part of the unit and must not
be altered in the field. The Natural Vented units are
equipped with a vent cap which is designed for gravity
venting. Air for combustion enters at the base of the
vent through a protective grille, and the design of the
vent cap is such that the products of combustion are
discharged at the upper section of the cap. This cap
is shipped in a separate carton. It should be fastened
in position as shown in Figure 7 and should not be
altered in any way.
The Power Vented unit has a power venting system
with the inlet and discharge grille located in the upper
section of the side access panel. This balanced flue
design also preforms well under all wind conditions.
All internal parts of the standard unit are fabricated
from aluminized steel. Standard burners are pressed
aluminized steel and have a stainless steel burner
port protector and air shutters. All internal and external
jacket par ts are fabricated from galvanized steel.
Stainless steel heat exchangers, burners and flue
collectors are optional. An optional 321 or 409 stainless
steel heat exchanger is highly recommended for the
following applications:
1) When the entering air temperature is below
40°F (4.4°C),
2) When the furnace is installed downstream of a
cooling coil section.
A pilot burner plate is provided for access to the pilot A pilot burner plate is provided for access to the pilot
burner and ignition systems without removing the
burner and ignition systems without removing the
burner drawer. Clearances between the external unit
burner drawer. Clearances between the external unit
and obstruction must be suffi cient for proper servicing
and obstruction must be suffi cient for proper servicing
of pull-out drawer. See Figures 1 and 2 for this
of pull-out drawer. See Figures 1 and 2 for this
clearance.
clearance.
The outdoor units are certified for operation on either The outdoor units are certified for operation on either
natural or propane gas. If a unit is to be installed at an
natural or propane gas. If a unit is to be installed at an
altitude exceeding 2000 ft. (610 m) above sea level,
altitude exceeding 2000 ft. (610 m) above sea level,
derate the input by 4% for each 1000 foot rise (305 m
derate the input by 4% for each 1000 foot rise (305 m
rise) above sea level. Check all local codes.
rise) above sea level. Check all local codes.
Special orifices are required for installations above Special orifices are required for installations above
2000 ft. (610 m). Check all local codes.
2000 ft. (610 m). Check all local codes.
In Canada, if a unit is to be installed at altitudes of In Canada, if a unit is to be installed at altitudes of
2000 ft. (610 m) to 4500 ft. (1372 m), the unit must be
2000 ft. (610 m) to 4500 ft. (1372 m), the unit must be
orifi ced to 90% of the normal altitude rating.
orifi ced to 90% of the normal altitude rating.
Unless otherwise specifi ed, the following conversions
may be used for calculating SI unit measurements:
1 inch = 25.4 mm
1 foot = 0.305 m
1 gallon = 3.785 L
1 pound = 0.454 kg
1 psig = 6.894 kPa
1 cubic foot = 0.028 m
3
GENERAL SAFETY INFORMATION
Roofcurb kits for rooftop gas heating units are
shipped knocked down. A curb kit contains (insulated)
curb rails, hardware, sealant, self-adhering rubber
gasketing, and installation instructions. Roof insulation,
cant strips, flashing, roof felts, caulking and nails
must be furnished by the installer. See separate curb
specifi cations from manufacturer.
Failure to comply with the general
safety information may result in extensive
property damage, severe personal injury or
death!
This product must be installed by
a licensed plumber or gas fi tter when installed
within the Commonwealth of Massachusetts.
Do not alter the unit heater in
any way or damage to the unit and/or severe
personal injury or death may occur!
Never service any component
without fi rst disconnecting all electrical and gas
supplies to the unit or severe personal injury or
death may occur!
Ensure that all power sources
conform to the requirements of the unit heater or
damage to the unit will result!
Installation must be made in accordance with local
codes, or in absence of local codes, with the latest
edition of ANSI Standard Z223.1 (NFPA No. 54)
National Fuel Gas Code. All of the ANSI and NFPA
Standards referred to in these installation instructions
are those that were applicable at the time the design
of the appliance was certified. The ANSI Standards
are available from the American National Standards
Institute, Inc., 11 West 42nd Street, New York, NY,
10036 or www.ansi.org. The NFPA Standards are
available from the National Fire Protection Association,
Batterymarch Park, Quincy, MA 02269.
If installed in Canada, the installation must conform
with local building codes, or in absence of local building
codes, with current CSA-B149.1 “Installation Codes
for Natural Gas Burning Appliance and Equipment”
or CSA-B149.2 “Installation Codes for Propane Gas
Burning Appliances and Equipment”. These outdoor
duct furnaces have been designed for and certifi ed to
comply with CSA 2.8.
These units have been designed and cer tified for
outdoor use only, and may be located on the roof of
the building or at any convenient location external of
the building to be heated. The input range is 100,000
BTU/HR. (29.3 kW) to 400,000 BTU/HR. (117.1 kW) in
50,000 BTU/HR. (14.6 kW) increments.
1000 Btu/Cu. Ft. = 37.5 MJ/m 3
1000 Btu per hour = 0.293 kW
1 inch water column = 0.249 kPa
liter/second = CFM x 0.472
meter/second = FPM ч 196.8