14
139472_Rev_B 8.28.12
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.
Gas Pressures
Correct gas pressure is essential for efficient and safe
operation of the Scan 45i TSI 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
for inlet or supply pressure (the amount of gas
coming to the valve.)
• ptp OUT
for manifold pressure (the amount of gas
that is coming out of the valve to the burner.)
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)
MIN.
MAX.
NATURAL GAS
5.0 WC
13.85 WC
PROPANE
12.0 WC
13.85 WC
NECESSARY MANIFOLD PRESSURES
(inches water column)
MIN. MAX.
NATURAL GAS
1.6 WC
3.5 WC
PROPANE
5.3 WC
11.0 WC
ALWAYS TEST PRESSURE WITH THE VALVE REGULATOR
ADJUSTED TO THE HIGHEST SETTING.
Figure 11. Gas connection components.
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 TSI is shipped
with a length of
3/8” cast iron nipple
and a 24” length of
flexible 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.
INSTALLATION OF A T-HANDLE GAS COCK IS RE-
QUIRED IN MASSACHUSETTS IN COMPLIANCE WITH
CODE 248CMR.
Manifold Tap
Inlet Tap
Pilot Adjustment
Figure 12. Pressure test and pilot adjustment points.
ptp OUT
