Requirements For Gas Heat - Trane Precedent YZC036E Installation, Operation And Maintenance Manual

Installation
Figure 58. Typical through-the-base gas installation

Requirements for Gas Heat

Note: The unit gas train and optional through-the-base
gas shut-off valve are rated at 1/2 PSIG maximum.
A pressure reducing regulator is recommended to
prevent this maximum from being exceeded.
These components must be isolated during field
gas piping test that exceed 1/2 PSIG. It is
recommended that the field piping be capped prior
to the unit gas train or optional through-the-base
gas shut-off valve if present.
• Gas supply line properly sized and connected to the
unit gas train.
• All gas piping joints properly sealed.
• Gas piping leak checked with a soap solution. If piping
connections to the unit are complete, do not pressurize
piping in excess of 0.50 psig or 14-inch wc to prevent
component failure.
• Drip leg Installed in the gas piping near the unit.
• Minimum gas supply pressure should be 4.5-inch wc.
Figure 59. Manifold pressure tap location
32
6 1/2" (165 MM) Pipe Nipple
90° Elbow
5" (127 MM) Pipe Nipple and Union
Modulating
Valve
Tap Location to Obtain Manifold
Pressure for Modulating Gas Heaters
Gas Shut-Off Valve
and Street Elbow
90° Elbow
and Nipples
• Minimum gas supply pressure for modulating "V"
models should be 5.5-inch wc.
• Maximum gas supply pressure must not exceed 14.0-
inch wc.
• Manifold pressure for single stage heaters should be
set to 3.3-inch wc.
• Manifold pressure for two stage heaters should be set
to 3.5-inch wc on high fire and 1.8-inch wc on low fire.
Note: Manifold pressure not applicable for units with
Low NOx gas furnace option. Manifold pressure is
not utilized as an adjustment/checking parameter
for this system.
• Manifold pressure for modulating heaters is 3.5-inch
wc at high fire.
Note: Modulating valve must have 10 Vdc signal voltage
to achieve high fire. See the following image for
manifold pressure tap location.
• Flue exhaust clear of any obstruction.
Adjust Manifold
Pressure Here
Main Gas Valve
RT-SVX46G-EN