Installation Piping; General Requirements - Trane Voyager Commercial Installation & Operation Manual

Installation Piping

General Requirements

All internal gas piping for YC* rooftop units are factory installed and leak tested. Once the unit is
set into place, a gas supply line must be field installed and connected to the gas train located inside
the gas heat compartment.
Hazardous Gases and Flammable Vapors!
Exposure to hazardous gases from fuel substances have been shown to cause cancer, birth
defects or other reproductive harm. Improper installation, adjustment, alteration, service or use
of this product could cause flammable mixtures. To avoid hazardous gases and flammable
vapors follow proper installation and set up of this product and all warnings as provided in this
manual. Failure to follow all instructions could result in death or serious injury.
Access holes are provided on the unit as shown in
entry. Following the guidelines listed below will enhance both the installation and operation of the
furnace.
Note: In the absence of local codes, the installation must conform with the American National
1. To assure sufficient gas pressure at the unit, use
2. Take all branch piping from any main gas line from the top at 90 degrees or side at 45 degrees
3. Ensure that all piping connections are adequately coated with joint sealant and properly
4. Provide a drip leg near the unit.
NOTICE:
Gas Valve Damage!
Failure to use a pressure regulating device will result in incorrect gas pressures. This can cause
erratic operation due to gas pressure fluctuations as well as damage to the gas valve.
Oversizing the regulator will cause irregular pulsating flame patterns, burner rumble, potential
flame outages, as well as possible gas valve damage.
5. Install a pressure regulator at the unit that is adequate to maintain 6" w.c. for natural gas and
Note: Gas pressure in excess of 14" w.c. or 0.5 psig will damage the gas train.
Hazard of Explosion!
Never use an open flame to detect gas leaks. Explosive conditions may occur. Use a leak test
solution or other approved methods for leak testing. Failure to follow recommended safe leak
test procedures could result in death or serious injury or equipment or property-only-damage.
6. Leak test the gas supply line using a soap-and-water solution or equivalent before connecting
50
WARNING
Standard Z223.1a of the National Fuel Gas Code, (latest edition).
size for the heating capacity listed on the unit's nameplate.
If a gas line already exists, verify that it is sized large enough
furnace capacity.
to prevent moisture from being drawn in with the gas.
tightened. Use a piping compound that is resistant to liquid petroleum gases.
11" w.c. for LP gas while the unit is operating in the "High Heat" mode. A minimum inlet gas
pressure of 2.5" w.c. for natural gas and 8" w.c. for LP gas is required while operating in the
"High Heat" mode.
WARNING
it to the gas train.
Figure 11, p. 23 to accommodate side panel
Table 16 to determine the appropriate gas pipe
(Table 16) to handle the additional
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