A.O. Smith 960 through 967 - Manual (Page 4)

BTH S E R V I C E H A N D B O O K
I N S T A L L A T I O N
INSTALLATION
CLEARANCES
CEILING
‘1.5
l_gpj
WALL
REAR WALL
.ÜT
. 0" ,
LEFT RIGHT
WALL
RIGHT
WALL
FRONT VIEW
*For removal of top cover
This portion of the handbook will review
often overlooked installation require­
ments. The installation manual covers
these items in detail. BTH water heaters
are approved for installation on com­
bustible flooring. The minimum clear­
ance to combustibles or non­
combustibles is 0 inches from the sides
wa L i I
and rear, 0 inches from vent piping, and
1.5 inches from the top cover. A 24 inch top view
clearance for all serviceable parts is
recommended. Clearances may vary
between BTH models. See installation
manual or the label on the heater for
your specific model.
GAS REQUIREMENTS
N O T E : Pressure without capacity will result in lockout. Follow the piping guidelines in the
installation manual. The supply gas pressure is normally measured at the dirt leg or at the inlet gas
pressure tap on the gas valve. This reading must be measured with ‘flowing’ gas.
The manifold gas pressure is measured at the manifold pressure tap on the gas valve when the
gas is flowing. The gas valves used on all BTH water heaters are 24 VAC combination step open­
ing gas valves. They incorporate the main valve and pressure regulator into one body.
REGULATED GAS SUPPLY LINE PRESSURE REGULATOR
ADJUSTMENT
(COVER screw '
INLET PRESSURE
TAP
GAS INLET
GAS VALVE ON/OFF
TH & TR TERMINALS
(MAIN VALVE)
VIANIFOLD
PRESSURE TAP
GAS OUTLET
GAS SUPPLY SPECIFICATIONS
BTH 120 & 250 BTH 150 & 199
BTH 120, 150 &
199
NATURAL GAS NATURAL GAS PROPANE GAS
Max. Gas Supply Pressure Inches W.C. 12.0 (3 kPa) 12.0 (3 kPa) 14.0(3.45 kPa)
Nominal Gas Supply Pressure Inches W.C. 7.0 (1.75 kPa) 7.0 (1.75 kPa) 11.0 (2.74 kPa)
Minimal Gas Supply Pressure Inches W.C. 5.5 (1.37 kPa) 4.5 (1.12 kPa) 11.0 (2.74 kPa)
Manifold Pressure Inches W.C. 4.0 (1 kPa) 3.5 (0.8 kPa) 10.0 (2.5 kPa)
A. O. Smith Water Products Co.
Ashland City, Tennessee © 2004 Technical Training Department
TC-044 Revision 6