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139234_Rev_A 9.17.10
Gas Supply Connection
The gas supply line connection is made to the valve on
the left side of the unit facing the front. The gas supply
line should be a minimum of 3/8" in diameter, or the
appropriate size to provide sufficient gas pressure to the
valve regardless of the input setting.
See fig. 11 and 12.
For your convenience, the Scan 45i is shipped with a
length of
3/8" cast iron nipple
ible gas line. We recommend the use of the flexible gas
line for ease of installation and service. However, for
those areas where flexible gas lines are not permitted,
use of the 3/8" iron nipple should be used. See fig. 11.
The use of Flexible Gas Appliance Connectors is ac-
ceptable in many areas in the U.S., however, Canadian
methods vary depending on local code.
ALL INSTALLATIONS MUST COMPLY WITH LOCAL
CODE OR IN THE ABSENCE OF LOCAL CODE, MUST COM-
PLY WITH THE MOST RECENT EDITION OF THE NATIONAL
FUEL GAS CODE ANSI Z223.1/NFPA 54 OR CAN-B149.
All codes require: a gas shut-off valve (gas cock)
.union, to be installed in the supply line, and in the same
room as the appliance. This allows for the disconnection
of the insert for servicing and maintenance. See fig. 11.
Secure all joints tightly using appropriate tools and
sealing compounds (for propane units, be sure to use
compounds that are propane resistant). Turn on gas sup-
ply and test for gas leaks using a soapy water solution or
electronic gas sensor. Never use an open flame to check
for leaks. Tighten or reconnect the leaking joint and
retest for any gas leaks.
1/2” x 3/8” Flare
Shut-off Valve
3/8” Flex Tubing
Gas Stub
3/8” Shut-off
Valve
1/2” x 3/8”
Reducer
Figure 11. Gas connection components.
14
and a 24" length of flex-
3/8” NPT x 3/8”
Flare Fitting
3/8”Nipple
3/8” Union
3/8” Close Nipple
INSTALLATION OF A T-HANDLE GAS COCK IS RE-
QUIRED IN MASSACHUSETTS IN COMPLIANCE WITH
CODE 248CMR.
Gas Pressures
Correct gas pressure is essential for efficient and safe
operation of the Scan 45i gas insert. It is important that
the correct pressure is established at the time of the
installation.
Proper gas pressure provides a consistent flow of
gas to the appliance and is instrumental in checking for
gas leaks. The gas control valve on the insert is equipped
with pressure test points for gauge connections. The
gauge connections are located on the front of the valve.
See fig. 12.
IN / E for inlet or supply pressure (the amount of gas
coming to the valve.)
OUT / A for manifold pressure (the amount of gas that
is coming out of the valve to the burner.)
A
Manifold
E
Inlet
Figure 12. Pressure test points.
The appliance must be isolated from the gas supply
line by closing its individual manual gas shut-off valve
(gas cock) during any pressure testing of the gas supply
piping system that is equal to or exceeds pressures
of 1/2 psig (3.5 kPa).
NECESSARY INLET GAS PRESSURES (inches water column)
NATURAL GAS
PROPANE
NECESSARY MANIFOLD PRESSURES
(inches water column)
NATURAL GAS
PROPANE
ALWAYS TEST PRESSURE WITH THE VALVE REGULATOR
ADJUSTED TO THE HIGHEST SETTING.
Pilot Adjustment
MIN.
MAX.
5.0 WC
13.85 WC
12.0 WC
13.85 WC
MIN.
MAX.
1.6 WC
3.5 WC
5.3 WC
11.0 WC
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